151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 22c87ad3a45cecf9e344487cad1abfdebe79f2c7cNarayan Kamath * Copyright (C) 2014 The Android Open Source Project 34c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage java.util; 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.lang.ref.WeakReference; 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.lang.ref.ReferenceQueue; 3060796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniakimport java.util.function.BiConsumer; 31135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmeraimport java.util.function.BiFunction; 3260796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniakimport java.util.function.Consumer; 3351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 3651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Hash table based implementation of the <tt>Map</tt> interface, with 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <em>weak keys</em>. 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * An entry in a <tt>WeakHashMap</tt> will automatically be removed when 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * its key is no longer in ordinary use. More precisely, the presence of a 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * mapping for a given key will not prevent the key from being discarded by the 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * garbage collector, that is, made finalizable, finalized, and then reclaimed. 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * When a key has been discarded its entry is effectively removed from the map, 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * so this class behaves somewhat differently from other <tt>Map</tt> 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * implementations. 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> Both null values and the null key are supported. This class has 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * performance characteristics similar to those of the <tt>HashMap</tt> 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * class, and has the same efficiency parameters of <em>initial capacity</em> 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and <em>load factor</em>. 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> Like most collection classes, this class is not synchronized. 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * A synchronized <tt>WeakHashMap</tt> may be constructed using the 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * {@link Collections#synchronizedMap Collections.synchronizedMap} 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method. 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> This class is intended primarily for use with key objects whose 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>equals</tt> methods test for object identity using the 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>==</tt> operator. Once such a key is discarded it can never be 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * recreated, so it is impossible to do a lookup of that key in a 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>WeakHashMap</tt> at some later time and be surprised that its entry 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * has been removed. This class will work perfectly well with key objects 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * whose <tt>equals</tt> methods are not based upon object identity, such 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as <tt>String</tt> instances. With such recreatable key objects, 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * however, the automatic removal of <tt>WeakHashMap</tt> entries whose 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * keys have been discarded may prove to be confusing. 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The behavior of the <tt>WeakHashMap</tt> class depends in part upon 6851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the actions of the garbage collector, so several familiar (though not 6951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * required) <tt>Map</tt> invariants do not hold for this class. Because 7051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the garbage collector may discard keys at any time, a 7151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>WeakHashMap</tt> may behave as though an unknown thread is silently 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * removing entries. In particular, even if you synchronize on a 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>WeakHashMap</tt> instance and invoke none of its mutator methods, it 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is possible for the <tt>size</tt> method to return smaller values over 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * time, for the <tt>isEmpty</tt> method to return <tt>false</tt> and 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then <tt>true</tt>, for the <tt>containsKey</tt> method to return 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>true</tt> and later <tt>false</tt> for a given key, for the 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>get</tt> method to return a value for a given key but later return 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>null</tt>, for the <tt>put</tt> method to return 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>null</tt> and the <tt>remove</tt> method to return 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>false</tt> for a key that previously appeared to be in the map, and 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * for successive examinations of the key set, the value collection, and 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the entry set to yield successively smaller numbers of elements. 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> Each key object in a <tt>WeakHashMap</tt> is stored indirectly as 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the referent of a weak reference. Therefore a key will automatically be 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * removed only after the weak references to it, both inside and outside of the 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * map, have been cleared by the garbage collector. 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> <strong>Implementation note:</strong> The value objects in a 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>WeakHashMap</tt> are held by ordinary strong references. Thus care 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * should be taken to ensure that value objects do not strongly refer to their 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * own keys, either directly or indirectly, since that will prevent the keys 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * from being discarded. Note that a value object may refer indirectly to its 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * key via the <tt>WeakHashMap</tt> itself; that is, a value object may 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * strongly refer to some other key object whose associated value object, in 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * turn, strongly refers to the key of the first value object. If the values 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * in the map do not rely on the map holding strong references to them, one way 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to deal with this is to wrap values themselves within 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>WeakReferences</tt> before 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * inserting, as in: <tt>m.put(key, new WeakReference(value))</tt>, 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then unwrapping upon each <tt>get</tt>. 10351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>The iterators returned by the <tt>iterator</tt> method of the collections 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * returned by all of this class's "collection view methods" are 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <i>fail-fast</i>: if the map is structurally modified at any time after the 10751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * iterator is created, in any way except through the iterator's own 10851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>remove</tt> method, the iterator will throw a {@link 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ConcurrentModificationException}. Thus, in the face of concurrent 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * modification, the iterator fails quickly and cleanly, rather than risking 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * arbitrary, non-deterministic behavior at an undetermined time in the future. 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>Note that the fail-fast behavior of an iterator cannot be guaranteed 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as it is, generally speaking, impossible to make any hard guarantees in the 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * presence of unsynchronized concurrent modification. Fail-fast iterators 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * throw <tt>ConcurrentModificationException</tt> on a best-effort basis. 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Therefore, it would be wrong to write a program that depended on this 11851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * exception for its correctness: <i>the fail-fast behavior of iterators 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * should be used only to detect bugs.</i> 12051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 12151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>This class is a member of the 122d2449bb576ad1e3a3877364e5e1ae28625f69e35Yi Kong * <a href="{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/collections/index.html"> 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Java Collections Framework</a>. 12451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param <K> the type of keys maintained by this map 12651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param <V> the type of mapped values 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author Doug Lea 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author Josh Bloch 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author Mark Reinhold 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.2 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.util.HashMap 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.ref.WeakReference 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class WeakHashMap<K,V> 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski extends AbstractMap<K,V> 13751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski implements Map<K,V> { 13851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 14051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The default initial capacity -- MUST be a power of two. 14151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 14251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static final int DEFAULT_INITIAL_CAPACITY = 16; 14351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 14451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 14551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The maximum capacity, used if a higher value is implicitly specified 14651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by either of the constructors with arguments. 14751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * MUST be a power of two <= 1<<30. 14851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 14951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static final int MAXIMUM_CAPACITY = 1 << 30; 15051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 15151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 15251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The load factor used when none specified in constructor. 15351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 15451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static final float DEFAULT_LOAD_FACTOR = 0.75f; 15551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 15651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 15751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The table, resized as necessary. Length MUST Always be a power of two. 15851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 15951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] table; 16051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 16151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 16251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The number of key-value mappings contained in this weak hash map. 16351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 16451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int size; 16551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 16651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 16751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The next size value at which to resize (capacity * load factor). 16851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 16951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int threshold; 17051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 17151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 17251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The load factor for the hash table. 17351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 17451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final float loadFactor; 17551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 17651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 17751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reference queue for cleared WeakEntries 17851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 17951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final ReferenceQueue<Object> queue = new ReferenceQueue<>(); 18051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 18151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 18251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The number of times this WeakHashMap has been structurally modified. 18351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Structural modifications are those that change the number of 18451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * mappings in the map or otherwise modify its internal structure 18551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (e.g., rehash). This field is used to make iterators on 18651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Collection-views of the map fail-fast. 18751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 18851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see ConcurrentModificationException 18951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 19051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int modCount; 19151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 19251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski @SuppressWarnings("unchecked") 19351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Entry<K,V>[] newTable(int n) { 19451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (Entry<K,V>[]) new Entry[n]; 19551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 19651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 19751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 19851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Constructs a new, empty <tt>WeakHashMap</tt> with the given initial 19951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * capacity and the given load factor. 20051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 20151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param initialCapacity The initial capacity of the <tt>WeakHashMap</tt> 20251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param loadFactor The load factor of the <tt>WeakHashMap</tt> 20351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @throws IllegalArgumentException if the initial capacity is negative, 20451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or if the load factor is nonpositive. 20551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 20651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public WeakHashMap(int initialCapacity, float loadFactor) { 20751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (initialCapacity < 0) 20851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Illegal Initial Capacity: "+ 20951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski initialCapacity); 21051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (initialCapacity > MAXIMUM_CAPACITY) 21151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski initialCapacity = MAXIMUM_CAPACITY; 21251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 21351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (loadFactor <= 0 || Float.isNaN(loadFactor)) 21451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Illegal Load factor: "+ 21551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski loadFactor); 21651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int capacity = 1; 21751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (capacity < initialCapacity) 21851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski capacity <<= 1; 21951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski table = newTable(capacity); 22051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.loadFactor = loadFactor; 22151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski threshold = (int)(capacity * loadFactor); 22251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 22351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 22451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 22551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Constructs a new, empty <tt>WeakHashMap</tt> with the given initial 22651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * capacity and the default load factor (0.75). 22751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 22851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param initialCapacity The initial capacity of the <tt>WeakHashMap</tt> 22951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @throws IllegalArgumentException if the initial capacity is negative 23051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 23151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public WeakHashMap(int initialCapacity) { 23251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(initialCapacity, DEFAULT_LOAD_FACTOR); 23351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 23451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 23551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 23651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Constructs a new, empty <tt>WeakHashMap</tt> with the default initial 23751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * capacity (16) and load factor (0.75). 23851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 23951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public WeakHashMap() { 24051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR); 24151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 24251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 24351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 24451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Constructs a new <tt>WeakHashMap</tt> with the same mappings as the 24551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified map. The <tt>WeakHashMap</tt> is created with the default 24651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * load factor (0.75) and an initial capacity sufficient to hold the 24751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * mappings in the specified map. 24851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 24951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param m the map whose mappings are to be placed in this map 25051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @throws NullPointerException if the specified map is null 25151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.3 25251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 25351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public WeakHashMap(Map<? extends K, ? extends V> m) { 25451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(Math.max((int) (m.size() / DEFAULT_LOAD_FACTOR) + 1, 25551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski DEFAULT_INITIAL_CAPACITY), 25651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski DEFAULT_LOAD_FACTOR); 25751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski putAll(m); 25851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 25951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 26051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // internal utilities 26151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 26251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 26351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Value representing null keys inside tables. 26451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 26551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static final Object NULL_KEY = new Object(); 26651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 26751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 26851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Use NULL_KEY for key if it is null. 26951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 27051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static Object maskNull(Object key) { 27151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (key == null) ? NULL_KEY : key; 27251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 27351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 27451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 27551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns internal representation of null key back to caller as null. 27651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 27751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski static Object unmaskNull(Object key) { 27851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (key == NULL_KEY) ? null : key; 27951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 28051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 28151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 28251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Checks for equality of non-null reference x and possibly-null y. By 28351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * default uses Object.equals. 28451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 28551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static boolean eq(Object x, Object y) { 28651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return x == y || x.equals(y); 28751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 28851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 28951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 29051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns index for hash code h. 29151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 29251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static int indexFor(int h, int length) { 29351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return h & (length-1); 29451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 29551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 29651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 29751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Expunges stale entries from the table. 29851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 29951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void expungeStaleEntries() { 30051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (Object x; (x = queue.poll()) != null; ) { 30151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (queue) { 30251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski @SuppressWarnings("unchecked") 30351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = (Entry<K,V>) x; 30451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int i = indexFor(e.hash, table.length); 30551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 30651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> prev = table[i]; 30751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> p = prev; 30851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (p != null) { 30951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> next = p.next; 31051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (p == e) { 31151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (prev == e) 31251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski table[i] = next; 31351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski else 31451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski prev.next = next; 31551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Must not null out e.next; 31651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // stale entries may be in use by a HashIterator 31751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e.value = null; // Help GC 31851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski size--; 31951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 32051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski prev = p; 32251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski p = next; 32351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 32851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 32951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the table after first expunging stale entries. 33051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 33151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Entry<K,V>[] getTable() { 33251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski expungeStaleEntries(); 33351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return table; 33451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 33551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 33651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 33751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the number of key-value mappings in this map. 33851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This result is a snapshot, and may not reflect unprocessed 33951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * entries that will be removed before next attempted access 34051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * because they are no longer referenced. 34151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 34251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int size() { 34351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (size == 0) 34451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return 0; 34551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski expungeStaleEntries(); 34651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return size; 34751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 34851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 34951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 35051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns <tt>true</tt> if this map contains no key-value mappings. 35151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This result is a snapshot, and may not reflect unprocessed 35251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * entries that will be removed before next attempted access 35351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * because they are no longer referenced. 35451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 35551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean isEmpty() { 35651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return size() == 0; 35751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 35851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 35951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 36051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the value to which the specified key is mapped, 36151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or {@code null} if this map contains no mapping for the key. 36251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 36351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>More formally, if this map contains a mapping from a key 36451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * {@code k} to a value {@code v} such that {@code (key==null ? k==null : 36551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * key.equals(k))}, then this method returns {@code v}; otherwise 36651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * it returns {@code null}. (There can be at most one such mapping.) 36751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 36851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>A return value of {@code null} does not <i>necessarily</i> 36951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * indicate that the map contains no mapping for the key; it's also 37051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * possible that the map explicitly maps the key to {@code null}. 37151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The {@link #containsKey containsKey} operation may be used to 37251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * distinguish these two cases. 37351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 37451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see #put(Object, Object) 37551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 37651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public V get(Object key) { 37751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object k = maskNull(key); 3786d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath int h = sun.misc.Hashing.singleWordWangJenkinsHash(k); 37951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 38051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int index = indexFor(h, tab.length); 38151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = tab[index]; 38251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (e != null) { 38351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (e.hash == h && eq(k, e.get())) 38451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return e.value; 38551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e = e.next; 38651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 38751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 38851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 38951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 39051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 39151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns <tt>true</tt> if this map contains a mapping for the 39251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified key. 39351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 39451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param key The key whose presence in this map is to be tested 39551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return <tt>true</tt> if there is a mapping for <tt>key</tt>; 39651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>false</tt> otherwise 39751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 39851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean containsKey(Object key) { 39951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return getEntry(key) != null; 40051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 40151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 40251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 40351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the entry associated with the specified key in this map. 40451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns null if the map contains no mapping for this key. 40551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 40651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> getEntry(Object key) { 40751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object k = maskNull(key); 4086d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath int h = sun.misc.Hashing.singleWordWangJenkinsHash(k); 40951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 41051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int index = indexFor(h, tab.length); 41151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = tab[index]; 41251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (e != null && !(e.hash == h && eq(k, e.get()))) 41351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e = e.next; 41451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return e; 41551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 41651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 41751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 41851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Associates the specified value with the specified key in this map. 41951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the map previously contained a mapping for this key, the old 42051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * value is replaced. 42151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 42251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param key key with which the specified value is to be associated. 42351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param value value to be associated with the specified key. 42451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the previous value associated with <tt>key</tt>, or 42551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>null</tt> if there was no mapping for <tt>key</tt>. 42651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (A <tt>null</tt> return can also indicate that the map 42751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * previously associated <tt>null</tt> with <tt>key</tt>.) 42851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 42951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public V put(K key, V value) { 43051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object k = maskNull(key); 4316d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath int h = sun.misc.Hashing.singleWordWangJenkinsHash(k); 43251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 43351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int i = indexFor(h, tab.length); 43451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 43551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (Entry<K,V> e = tab[i]; e != null; e = e.next) { 43651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (h == e.hash && eq(k, e.get())) { 43751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski V oldValue = e.value; 43851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (value != oldValue) 43951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e.value = value; 44051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return oldValue; 44151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 44251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 44351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 44451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski modCount++; 44551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = tab[i]; 44651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski tab[i] = new Entry<>(k, value, queue, h, e); 44751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (++size >= threshold) 44851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski resize(tab.length * 2); 44951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 45051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 45351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Rehashes the contents of this map into a new array with a 45451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * larger capacity. This method is called automatically when the 45551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * number of keys in this map reaches its threshold. 45651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 45751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If current capacity is MAXIMUM_CAPACITY, this method does not 45851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * resize the map, but sets threshold to Integer.MAX_VALUE. 45951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This has the effect of preventing future calls. 46051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 46151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param newCapacity the new capacity, MUST be a power of two; 46251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * must be greater than current capacity unless current 46351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * capacity is MAXIMUM_CAPACITY (in which case value 46451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is irrelevant). 46551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 46651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski void resize(int newCapacity) { 46751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] oldTable = getTable(); 46851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int oldCapacity = oldTable.length; 46951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (oldCapacity == MAXIMUM_CAPACITY) { 47051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski threshold = Integer.MAX_VALUE; 47151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return; 47251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 47351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 47451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] newTable = newTable(newCapacity); 4756d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath transfer(oldTable, newTable); 47651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski table = newTable; 47751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 47851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* 47951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If ignoring null elements and processing ref queue caused massive 48051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * shrinkage, then restore old table. This should be rare, but avoids 48151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * unbounded expansion of garbage-filled tables. 48251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 48351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (size >= threshold / 2) { 48451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski threshold = (int)(newCapacity * loadFactor); 48551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } else { 48651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski expungeStaleEntries(); 4876d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath transfer(newTable, oldTable); 48851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski table = oldTable; 48951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 49251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** Transfers all entries from src to dest tables */ 4936d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath private void transfer(Entry<K,V>[] src, Entry<K,V>[] dest) { 49451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int j = 0; j < src.length; ++j) { 49551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = src[j]; 49651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski src[j] = null; 49751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (e != null) { 49851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> next = e.next; 49951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object key = e.get(); 50051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (key == null) { 50151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e.next = null; // Help GC 50251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e.value = null; // " " 50351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski size--; 50451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } else { 50551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int i = indexFor(e.hash, dest.length); 50651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e.next = dest[i]; 50751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski dest[i] = e; 50851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 50951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e = next; 51051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 51151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 51251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 51351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 51451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 51551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Copies all of the mappings from the specified map to this map. 51651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * These mappings will replace any mappings that this map had for any 51751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the keys currently in the specified map. 51851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 51951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param m mappings to be stored in this map. 52051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @throws NullPointerException if the specified map is null. 52151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 52251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void putAll(Map<? extends K, ? extends V> m) { 52351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int numKeysToBeAdded = m.size(); 52451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (numKeysToBeAdded == 0) 52551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return; 52651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 52751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* 52851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Expand the map if the map if the number of mappings to be added 52951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is greater than or equal to threshold. This is conservative; the 53051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * obvious condition is (m.size() + size) >= threshold, but this 53151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * condition could result in a map with twice the appropriate capacity, 53251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the keys to be added overlap with the keys already in this map. 53351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * By using the conservative calculation, we subject ourself 53451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to at most one extra resize. 53551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 53651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (numKeysToBeAdded > threshold) { 53751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int targetCapacity = (int)(numKeysToBeAdded / loadFactor + 1); 53851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (targetCapacity > MAXIMUM_CAPACITY) 53951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski targetCapacity = MAXIMUM_CAPACITY; 54051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int newCapacity = table.length; 54151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (newCapacity < targetCapacity) 54251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newCapacity <<= 1; 54351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (newCapacity > table.length) 54451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski resize(newCapacity); 54551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 54651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 54751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (Map.Entry<? extends K, ? extends V> e : m.entrySet()) 54851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski put(e.getKey(), e.getValue()); 54951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 55051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 55151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 55251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Removes the mapping for a key from this weak hash map if it is present. 55351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * More formally, if this map contains a mapping from key <tt>k</tt> to 55451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * value <tt>v</tt> such that <code>(key==null ? k==null : 55551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * key.equals(k))</code>, that mapping is removed. (The map can contain 55651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at most one such mapping.) 55751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 55851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>Returns the value to which this map previously associated the key, 55951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or <tt>null</tt> if the map contained no mapping for the key. A 56051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * return value of <tt>null</tt> does not <i>necessarily</i> indicate 56151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that the map contained no mapping for the key; it's also possible 56251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that the map explicitly mapped the key to <tt>null</tt>. 56351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 56451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>The map will not contain a mapping for the specified key once the 56551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * call returns. 56651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 56751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param key key whose mapping is to be removed from the map 56851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the previous value associated with <tt>key</tt>, or 56951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>null</tt> if there was no mapping for <tt>key</tt> 57051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 57151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public V remove(Object key) { 57251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object k = maskNull(key); 5736d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath int h = sun.misc.Hashing.singleWordWangJenkinsHash(k); 57451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 57551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int i = indexFor(h, tab.length); 57651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> prev = tab[i]; 57751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = prev; 57851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 57951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (e != null) { 58051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> next = e.next; 58151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (h == e.hash && eq(k, e.get())) { 58251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski modCount++; 58351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski size--; 58451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (prev == e) 58551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski tab[i] = next; 58651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski else 58751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski prev.next = next; 58851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return e.value; 58951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 59051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski prev = e; 59151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e = next; 59251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 59351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 59451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 59551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 59651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 59751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** Special version of remove needed by Entry set */ 59851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean removeMapping(Object o) { 59951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!(o instanceof Map.Entry)) 60051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 60151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 60251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Map.Entry<?,?> entry = (Map.Entry<?,?>)o; 60351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object k = maskNull(entry.getKey()); 6046d562f688e350ade3c025bfb1c4c8cca9b3e2030Narayan Kamath int h = sun.misc.Hashing.singleWordWangJenkinsHash(k); 60551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int i = indexFor(h, tab.length); 60651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> prev = tab[i]; 60751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = prev; 60851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 60951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (e != null) { 61051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> next = e.next; 61151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (h == e.hash && e.equals(entry)) { 61251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski modCount++; 61351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski size--; 61451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (prev == e) 61551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski tab[i] = next; 61651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski else 61751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski prev.next = next; 61851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return true; 61951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 62051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski prev = e; 62151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e = next; 62251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 62351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 62451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 62551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 62651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 62751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 62851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Removes all of the mappings from this map. 62951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The map will be empty after this call returns. 63051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 63151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void clear() { 63251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // clear out ref queue. We don't need to expunge entries 63351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // since table is getting cleared. 63451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (queue.poll() != null) 63551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski ; 63651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 63751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski modCount++; 63851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Arrays.fill(table, null); 63951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski size = 0; 64051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Allocation of array may have caused GC, which may have caused 64251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // additional entries to go stale. Removing these entries from the 64351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // reference queue will make them eligible for reclamation. 64451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (queue.poll() != null) 64551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski ; 64651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 64751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 64951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns <tt>true</tt> if this map maps one or more keys to the 65051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified value. 65151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 65251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param value value whose presence in this map is to be tested 65351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return <tt>true</tt> if this map maps one or more keys to the 65451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified value 65551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 65651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean containsValue(Object value) { 65751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (value==null) 65851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return containsNullValue(); 65951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 66051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 66151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = tab.length; i-- > 0;) 66251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (Entry<K,V> e = tab[i]; e != null; e = e.next) 66351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (value.equals(e.value)) 66451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return true; 66551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 66651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 66751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 66851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 66951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Special-case code for containsValue with null argument 67051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 67151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private boolean containsNullValue() { 67251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] tab = getTable(); 67351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = tab.length; i-- > 0;) 67451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (Entry<K,V> e = tab[i]; e != null; e = e.next) 67551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (e.value==null) 67651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return true; 67751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 67851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 67951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 68051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 68151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The entries in this hash table extend WeakReference, using its main ref 68251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * field as the key. 68351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 68451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static class Entry<K,V> extends WeakReference<Object> implements Map.Entry<K,V> { 68551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski V value; 68651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int hash; 68751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> next; 68851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 68951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 69051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates new entry. 69151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 69251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry(Object key, V value, 69351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski ReferenceQueue<Object> queue, 69451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int hash, Entry<K,V> next) { 69551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski super(key, queue); 69651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.value = value; 69751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.hash = hash; 69851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.next = next; 69951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 70051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 70151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski @SuppressWarnings("unchecked") 70251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public K getKey() { 70351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (K) WeakHashMap.unmaskNull(get()); 70451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 70551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 70651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public V getValue() { 70751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return value; 70851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 70951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 71051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public V setValue(V newValue) { 71151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski V oldValue = value; 71251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski value = newValue; 71351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return oldValue; 71451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 71551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 71651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean equals(Object o) { 71751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!(o instanceof Map.Entry)) 71851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 71951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Map.Entry<?,?> e = (Map.Entry<?,?>)o; 72051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski K k1 = getKey(); 72151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object k2 = e.getKey(); 72251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (k1 == k2 || (k1 != null && k1.equals(k2))) { 72351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski V v1 = getValue(); 72451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object v2 = e.getValue(); 72551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (v1 == v2 || (v1 != null && v1.equals(v2))) 72651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return true; 72751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 72851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 72951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 73051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 73151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int hashCode() { 73251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski K k = getKey(); 73351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski V v = getValue(); 73451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((k==null ? 0 : k.hashCode()) ^ 73551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski (v==null ? 0 : v.hashCode())); 73651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 73751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 73851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public String toString() { 73951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return getKey() + "=" + getValue(); 74051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 74151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 74251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 74351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private abstract class HashIterator<T> implements Iterator<T> { 74451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int index; 74551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Entry<K,V> entry = null; 74651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Entry<K,V> lastReturned = null; 74751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int expectedModCount = modCount; 74851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 74951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 75051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Strong reference needed to avoid disappearance of key 75151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * between hasNext and next 75251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 75351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object nextKey = null; 75451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 75551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 75651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Strong reference needed to avoid disappearance of key 75751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * between nextEntry() and any use of the entry 75851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 75951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object currentKey = null; 76051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 76151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski HashIterator() { 76251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski index = isEmpty() ? 0 : table.length; 76351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 76451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 76551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean hasNext() { 76651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V>[] t = table; 76751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 76851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (nextKey == null) { 76951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> e = entry; 77051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int i = index; 77151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (e == null && i > 0) 77251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski e = t[--i]; 77351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski entry = e; 77451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski index = i; 77551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (e == null) { 77651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski currentKey = null; 77751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 77851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 77951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski nextKey = e.get(); // hold on to key in strong ref 78051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (nextKey == null) 78151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski entry = entry.next; 78251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 78351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return true; 78451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 78551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 78651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** The common parts of next() across different types of iterators */ 78751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski protected Entry<K,V> nextEntry() { 78851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (modCount != expectedModCount) 78951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new ConcurrentModificationException(); 79051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (nextKey == null && !hasNext()) 79151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new NoSuchElementException(); 79251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 79351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski lastReturned = entry; 79451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski entry = entry.next; 79551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski currentKey = nextKey; 79651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski nextKey = null; 79751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return lastReturned; 79851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 79951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 80051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void remove() { 80151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (lastReturned == null) 80251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalStateException(); 80351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (modCount != expectedModCount) 80451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new ConcurrentModificationException(); 80551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 80651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski WeakHashMap.this.remove(currentKey); 80751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski expectedModCount = modCount; 80851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski lastReturned = null; 80951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski currentKey = null; 81051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 81151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 81251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 81351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 81451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private class ValueIterator extends HashIterator<V> { 81551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public V next() { 81651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return nextEntry().value; 81751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 81851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 81951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 82051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private class KeyIterator extends HashIterator<K> { 82151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public K next() { 82251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return nextEntry().getKey(); 82351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 82451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 82551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 82651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private class EntryIterator extends HashIterator<Map.Entry<K,V>> { 82751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Map.Entry<K,V> next() { 82851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return nextEntry(); 82951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 83051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 83151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 83251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Views 83351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 83451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private transient Set<Map.Entry<K,V>> entrySet = null; 83551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 83651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 83751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns a {@link Set} view of the keys contained in this map. 83851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The set is backed by the map, so changes to the map are 83951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reflected in the set, and vice-versa. If the map is modified 84051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while an iteration over the set is in progress (except through 84151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the iterator's own <tt>remove</tt> operation), the results of 84251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the iteration are undefined. The set supports element removal, 84351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * which removes the corresponding mapping from the map, via the 84451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, 84551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> 84651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * operations. It does not support the <tt>add</tt> or <tt>addAll</tt> 84751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * operations. 84851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 84951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Set<K> keySet() { 85051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Set<K> ks = keySet; 85151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ks != null ? ks : (keySet = new KeySet())); 85251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 85351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 85451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private class KeySet extends AbstractSet<K> { 85551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Iterator<K> iterator() { 85651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return new KeyIterator(); 85751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 85851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 85951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int size() { 86051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return WeakHashMap.this.size(); 86151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 86251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 86351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean contains(Object o) { 86451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return containsKey(o); 86551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 86651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 86751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean remove(Object o) { 86851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (containsKey(o)) { 86951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski WeakHashMap.this.remove(o); 87051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return true; 87151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 87251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski else 87351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 87451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 87551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 87651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void clear() { 87751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski WeakHashMap.this.clear(); 87851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8794c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 8804c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public Spliterator<K> spliterator() { 8814c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return new KeySpliterator<>(WeakHashMap.this, 0, -1, 0, 0); 8824c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 88351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 88451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 88551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 88651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns a {@link Collection} view of the values contained in this map. 88751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The collection is backed by the map, so changes to the map are 88851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reflected in the collection, and vice-versa. If the map is 88951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * modified while an iteration over the collection is in progress 89051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (except through the iterator's own <tt>remove</tt> operation), 89151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the results of the iteration are undefined. The collection 89251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * supports element removal, which removes the corresponding 89351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * mapping from the map, via the <tt>Iterator.remove</tt>, 89451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>Collection.remove</tt>, <tt>removeAll</tt>, 89551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>retainAll</tt> and <tt>clear</tt> operations. It does not 89651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * support the <tt>add</tt> or <tt>addAll</tt> operations. 89751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 89851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Collection<V> values() { 89951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Collection<V> vs = values; 90051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (vs != null) ? vs : (values = new Values()); 90151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 90251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 90351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private class Values extends AbstractCollection<V> { 90451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Iterator<V> iterator() { 90551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return new ValueIterator(); 90651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 90751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 90851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int size() { 90951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return WeakHashMap.this.size(); 91051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 91151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 91251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean contains(Object o) { 91351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return containsValue(o); 91451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 91551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 91651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void clear() { 91751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski WeakHashMap.this.clear(); 91851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 9194c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 9204c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public Spliterator<V> spliterator() { 9214c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return new ValueSpliterator<>(WeakHashMap.this, 0, -1, 0, 0); 9224c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 92351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 92451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 92551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 92651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns a {@link Set} view of the mappings contained in this map. 92751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The set is backed by the map, so changes to the map are 92851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reflected in the set, and vice-versa. If the map is modified 92951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while an iteration over the set is in progress (except through 93051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the iterator's own <tt>remove</tt> operation, or through the 93151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>setValue</tt> operation on a map entry returned by the 93251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * iterator) the results of the iteration are undefined. The set 93351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * supports element removal, which removes the corresponding 93451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * mapping from the map, via the <tt>Iterator.remove</tt>, 93551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and 93651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>clear</tt> operations. It does not support the 93751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>add</tt> or <tt>addAll</tt> operations. 93851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 93951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Set<Map.Entry<K,V>> entrySet() { 94051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Set<Map.Entry<K,V>> es = entrySet; 94151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return es != null ? es : (entrySet = new EntrySet()); 94251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 94451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private class EntrySet extends AbstractSet<Map.Entry<K,V>> { 94551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Iterator<Map.Entry<K,V>> iterator() { 94651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return new EntryIterator(); 94751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 94951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean contains(Object o) { 95051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (!(o instanceof Map.Entry)) 95151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 95251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Map.Entry<?,?> e = (Map.Entry<?,?>)o; 95351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Entry<K,V> candidate = getEntry(e.getKey()); 95451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return candidate != null && candidate.equals(e); 95551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 95751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public boolean remove(Object o) { 95851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return removeMapping(o); 95951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 96051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 96151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int size() { 96251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return WeakHashMap.this.size(); 96351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 96451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 96551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void clear() { 96651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski WeakHashMap.this.clear(); 96751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 96851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 96951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private List<Map.Entry<K,V>> deepCopy() { 97051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski List<Map.Entry<K,V>> list = new ArrayList<>(size()); 97151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (Map.Entry<K,V> e : this) 97251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski list.add(new AbstractMap.SimpleEntry<>(e)); 97351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return list; 97451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 97551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 97651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Object[] toArray() { 97751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return deepCopy().toArray(); 97851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 97951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 98051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public <T> T[] toArray(T[] a) { 98151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return deepCopy().toArray(a); 98251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 9834c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 9844c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public Spliterator<Map.Entry<K,V>> spliterator() { 9854c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return new EntrySpliterator<>(WeakHashMap.this, 0, -1, 0, 0); 9864c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 98751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 98860796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak 98960796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak @SuppressWarnings("unchecked") 99060796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak @Override 99160796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak public void forEach(BiConsumer<? super K, ? super V> action) { 99260796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak Objects.requireNonNull(action); 99360796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak int expectedModCount = modCount; 99460796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak 99560796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak Entry<K, V>[] tab = getTable(); 99660796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak for (Entry<K, V> entry : tab) { 99760796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak while (entry != null) { 99860796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak Object key = entry.get(); 99960796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak if (key != null) { 100060796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak action.accept((K)WeakHashMap.unmaskNull(key), entry.value); 100160796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak } 100260796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak entry = entry.next; 100360796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak 100460796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak if (expectedModCount != modCount) { 100560796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak throw new ConcurrentModificationException(); 100660796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak } 100760796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak } 100860796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak } 100960796efea3a74e02aea384b8eb56103ea21b880bPrzemyslaw Szczepaniak } 10104c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 1011135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera @SuppressWarnings("unchecked") 1012135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera @Override 1013135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { 1014135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera Objects.requireNonNull(function); 1015135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera int expectedModCount = modCount; 1016135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera 1017135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera Entry<K, V>[] tab = getTable(); 1018135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera for (Entry<K, V> entry : tab) { 1019135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera while (entry != null) { 1020135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera Object key = entry.get(); 1021135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera if (key != null) { 1022135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera entry.value = function.apply((K)WeakHashMap.unmaskNull(key), entry.value); 1023135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera } 1024135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera entry = entry.next; 1025135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera 1026135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera if (expectedModCount != modCount) { 1027135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera throw new ConcurrentModificationException(); 1028135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera } 1029135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera } 1030135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera } 1031135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera } 1032135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera 1033135ea6cd4f7ebe2f225351a1928d8a62bce5cb00Shubham Ajmera 10344c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath /** 10354c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath * Similar form as other hash Spliterators, but skips dead 10364c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath * elements. 10374c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath */ 10384c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath static class WeakHashMapSpliterator<K,V> { 10394c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath final WeakHashMap<K,V> map; 10404c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V> current; // current node 10414c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int index; // current index, modified on advance/split 10424c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int fence; // -1 until first use; then one past last index 10434c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int est; // size estimate 10444c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int expectedModCount; // for comodification checks 10454c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 10464c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMapSpliterator(WeakHashMap<K,V> m, int origin, 10474c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int fence, int est, 10484c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int expectedModCount) { 10494c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath this.map = m; 10504c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath this.index = origin; 10514c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath this.fence = fence; 10524c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath this.est = est; 10534c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath this.expectedModCount = expectedModCount; 10544c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10554c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 10564c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath final int getFence() { // initialize fence and size on first use 10574c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi; 10584c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if ((hi = fence) < 0) { 10594c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap<K,V> m = map; 10604c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath est = m.size(); 10614c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath expectedModCount = m.modCount; 10624c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath hi = fence = m.table.length; 10634c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10644c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return hi; 10654c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10664c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 10674c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public final long estimateSize() { 10684c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath getFence(); // force init 10694c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return (long) est; 10704c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10714c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10724c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 10734c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath static final class KeySpliterator<K,V> 10744c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath extends WeakHashMapSpliterator<K,V> 10754c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath implements Spliterator<K> { 10764c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath KeySpliterator(WeakHashMap<K,V> m, int origin, int fence, int est, 10774c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int expectedModCount) { 10784c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath super(m, origin, fence, est, expectedModCount); 10794c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10804c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 10814c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public KeySpliterator<K,V> trySplit() { 10824c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi = getFence(), lo = index, mid = (lo + hi) >>> 1; 10834c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return (lo >= mid) ? null : 10844c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath new KeySpliterator<K,V>(map, lo, index = mid, est >>>= 1, 10854c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath expectedModCount); 10864c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10874c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 10884c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public void forEachRemaining(Consumer<? super K> action) { 10894c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int i, hi, mc; 10904c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (action == null) 10914c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new NullPointerException(); 10924c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap<K,V> m = map; 10934c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V>[] tab = m.table; 10944c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if ((hi = fence) < 0) { 10954c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath mc = expectedModCount = m.modCount; 10964c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath hi = fence = tab.length; 10974c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 10984c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else 10994c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath mc = expectedModCount; 11004c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (tab.length >= hi && (i = index) >= 0 && 11014c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (i < (index = hi) || current != null)) { 11024c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V> p = current; 11034c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = null; // exhaust 11044c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath do { 11054c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (p == null) 11064c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath p = tab[i++]; 11074c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else { 11084c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath Object x = p.get(); 11094c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath p = p.next; 11104c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (x != null) { 11114c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath @SuppressWarnings("unchecked") K k = 11124c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (K) WeakHashMap.unmaskNull(x); 11134c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath action.accept(k); 11144c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11154c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11164c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } while (p != null || i < hi); 11174c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11184c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (m.modCount != mc) 11194c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new ConcurrentModificationException(); 11204c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11214c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 11224c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public boolean tryAdvance(Consumer<? super K> action) { 11234c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi; 11244c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (action == null) 11254c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new NullPointerException(); 11264c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V>[] tab = map.table; 11274c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (tab.length >= (hi = getFence()) && index >= 0) { 11284c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath while (current != null || index < hi) { 11294c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (current == null) 11304c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = tab[index++]; 11314c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else { 11324c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath Object x = current.get(); 11334c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = current.next; 11344c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (x != null) { 11354c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath @SuppressWarnings("unchecked") K k = 11364c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (K) WeakHashMap.unmaskNull(x); 11374c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath action.accept(k); 11384c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (map.modCount != expectedModCount) 11394c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new ConcurrentModificationException(); 11404c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return true; 11414c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11424c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11434c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11444c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11454c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return false; 11464c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11474c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 11484c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public int characteristics() { 11494c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return Spliterator.DISTINCT; 11504c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11514c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11524c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 11534c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath static final class ValueSpliterator<K,V> 11544c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath extends WeakHashMapSpliterator<K,V> 11554c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath implements Spliterator<V> { 11564c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath ValueSpliterator(WeakHashMap<K,V> m, int origin, int fence, int est, 11574c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int expectedModCount) { 11584c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath super(m, origin, fence, est, expectedModCount); 11594c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11604c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 11614c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public ValueSpliterator<K,V> trySplit() { 11624c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi = getFence(), lo = index, mid = (lo + hi) >>> 1; 11634c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return (lo >= mid) ? null : 11644c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath new ValueSpliterator<K,V>(map, lo, index = mid, est >>>= 1, 11654c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath expectedModCount); 11664c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11674c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 11684c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public void forEachRemaining(Consumer<? super V> action) { 11694c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int i, hi, mc; 11704c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (action == null) 11714c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new NullPointerException(); 11724c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap<K,V> m = map; 11734c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V>[] tab = m.table; 11744c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if ((hi = fence) < 0) { 11754c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath mc = expectedModCount = m.modCount; 11764c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath hi = fence = tab.length; 11774c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11784c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else 11794c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath mc = expectedModCount; 11804c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (tab.length >= hi && (i = index) >= 0 && 11814c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (i < (index = hi) || current != null)) { 11824c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V> p = current; 11834c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = null; // exhaust 11844c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath do { 11854c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (p == null) 11864c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath p = tab[i++]; 11874c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else { 11884c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath Object x = p.get(); 11894c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath V v = p.value; 11904c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath p = p.next; 11914c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (x != null) 11924c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath action.accept(v); 11934c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11944c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } while (p != null || i < hi); 11954c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11964c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (m.modCount != mc) 11974c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new ConcurrentModificationException(); 11984c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 11994c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12004c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public boolean tryAdvance(Consumer<? super V> action) { 12014c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi; 12024c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (action == null) 12034c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new NullPointerException(); 12044c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V>[] tab = map.table; 12054c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (tab.length >= (hi = getFence()) && index >= 0) { 12064c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath while (current != null || index < hi) { 12074c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (current == null) 12084c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = tab[index++]; 12094c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else { 12104c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath Object x = current.get(); 12114c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath V v = current.value; 12124c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = current.next; 12134c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (x != null) { 12144c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath action.accept(v); 12154c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (map.modCount != expectedModCount) 12164c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new ConcurrentModificationException(); 12174c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return true; 12184c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12194c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12204c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12214c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12224c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return false; 12234c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12244c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12254c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public int characteristics() { 12264c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return 0; 12274c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12284c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12294c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12304c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath static final class EntrySpliterator<K,V> 12314c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath extends WeakHashMapSpliterator<K,V> 12324c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath implements Spliterator<Map.Entry<K,V>> { 12334c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath EntrySpliterator(WeakHashMap<K,V> m, int origin, int fence, int est, 12344c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int expectedModCount) { 12354c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath super(m, origin, fence, est, expectedModCount); 12364c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12374c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12384c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public EntrySpliterator<K,V> trySplit() { 12394c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi = getFence(), lo = index, mid = (lo + hi) >>> 1; 12404c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return (lo >= mid) ? null : 12414c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath new EntrySpliterator<K,V>(map, lo, index = mid, est >>>= 1, 12424c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath expectedModCount); 12434c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12444c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12454c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12464c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public void forEachRemaining(Consumer<? super Map.Entry<K, V>> action) { 12474c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int i, hi, mc; 12484c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (action == null) 12494c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new NullPointerException(); 12504c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap<K,V> m = map; 12514c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V>[] tab = m.table; 12524c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if ((hi = fence) < 0) { 12534c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath mc = expectedModCount = m.modCount; 12544c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath hi = fence = tab.length; 12554c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12564c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else 12574c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath mc = expectedModCount; 12584c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (tab.length >= hi && (i = index) >= 0 && 12594c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (i < (index = hi) || current != null)) { 12604c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V> p = current; 12614c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = null; // exhaust 12624c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath do { 12634c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (p == null) 12644c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath p = tab[i++]; 12654c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else { 12664c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath Object x = p.get(); 12674c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath V v = p.value; 12684c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath p = p.next; 12694c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (x != null) { 12704c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath @SuppressWarnings("unchecked") K k = 12714c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (K) WeakHashMap.unmaskNull(x); 12724c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath action.accept 12734c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (new AbstractMap.SimpleImmutableEntry<K,V>(k, v)); 12744c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12754c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12764c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } while (p != null || i < hi); 12774c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12784c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (m.modCount != mc) 12794c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new ConcurrentModificationException(); 12804c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 12814c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 12824c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public boolean tryAdvance(Consumer<? super Map.Entry<K,V>> action) { 12834c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath int hi; 12844c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (action == null) 12854c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new NullPointerException(); 12864c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath WeakHashMap.Entry<K,V>[] tab = map.table; 12874c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (tab.length >= (hi = getFence()) && index >= 0) { 12884c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath while (current != null || index < hi) { 12894c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (current == null) 12904c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = tab[index++]; 12914c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath else { 12924c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath Object x = current.get(); 12934c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath V v = current.value; 12944c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath current = current.next; 12954c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (x != null) { 12964c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath @SuppressWarnings("unchecked") K k = 12974c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (K) WeakHashMap.unmaskNull(x); 12984c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath action.accept 12994c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath (new AbstractMap.SimpleImmutableEntry<K,V>(k, v)); 13004c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath if (map.modCount != expectedModCount) 13014c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath throw new ConcurrentModificationException(); 13024c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return true; 13034c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13044c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13054c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13064c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13074c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return false; 13084c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13094c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 13104c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath public int characteristics() { 13114c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath return Spliterator.DISTINCT; 13124c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13134c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath } 13144c89023ef86f29fa9add7db2574f2169fe842577Narayan Kamath 131551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 1316