1/* 2 * Copyright (C) 2008 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.google.common.collect; 18 19import com.google.common.annotations.GwtCompatible; 20import com.google.common.annotations.GwtIncompatible; 21 22import java.io.Serializable; 23import java.util.Map.Entry; 24 25import javax.annotation.Nullable; 26 27/** 28 * {@code entrySet()} implementation for {@link ImmutableMap}. 29 * 30 * @author Jesse Wilson 31 * @author Kevin Bourrillion 32 */ 33@GwtCompatible(emulated = true) 34abstract class ImmutableMapEntrySet<K, V> extends ImmutableSet<Entry<K, V>> { 35 ImmutableMapEntrySet() {} 36 37 abstract ImmutableMap<K, V> map(); 38 39 @Override 40 public int size() { 41 return map().size(); 42 } 43 44 @Override 45 public boolean contains(@Nullable Object object) { 46 if (object instanceof Entry) { 47 Entry<?, ?> entry = (Entry<?, ?>) object; 48 V value = map().get(entry.getKey()); 49 return value != null && value.equals(entry.getValue()); 50 } 51 return false; 52 } 53 54 @Override 55 boolean isPartialView() { 56 return map().isPartialView(); 57 } 58 59 @GwtIncompatible("serialization") 60 @Override 61 Object writeReplace() { 62 return new EntrySetSerializedForm<K, V>(map()); 63 } 64 65 @GwtIncompatible("serialization") 66 private static class EntrySetSerializedForm<K, V> implements Serializable { 67 final ImmutableMap<K, V> map; 68 EntrySetSerializedForm(ImmutableMap<K, V> map) { 69 this.map = map; 70 } 71 Object readResolve() { 72 return map.entrySet(); 73 } 74 private static final long serialVersionUID = 0; 75 } 76} 77