11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2007 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * in compliance with the License. You may obtain a copy of the License at 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software distributed under the License 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * or implied. See the License for the specific language governing permissions and limitations under 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * the License. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.collect; 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkArgument; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.GwtCompatible; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.collect.Multiset.Entry; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.io.Serializable; 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Iterator; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Map; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.atomic.AtomicInteger; 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unit test for {@link AbstractMultiset}. 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Kevin Bourrillion 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Louis Wasserman 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@SuppressWarnings("serial") // No serialization is used in this test 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic class SimpleAbstractMultisetTest extends AbstractMultisetTest { 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override protected <E> Multiset<E> create() { 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new SimpleAbstractMultiset<E>(); 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void testFastAddAllMultiset() { 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final AtomicInteger addCalls = new AtomicInteger(); 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Multiset<String> multiset = new NoRemoveMultiset<String>() { 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public int add(String element, int occurrences) { 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert addCalls.incrementAndGet(); 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return super.add(element, occurrences); 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }; 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ImmutableMultiset<String> adds = 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert new ImmutableMultiset.Builder<String>().addCopies("x", 10).build(); 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert multiset.addAll(adds); 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertEquals(addCalls.get(), 1); 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void testRemoveUnsupported() { 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Multiset<String> multiset = new NoRemoveMultiset<String>(); 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert multiset.add("a"); 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert multiset.remove("a"); 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert fail(); 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } catch (UnsupportedOperationException expected) {} 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert assertTrue(multiset.contains("a")); 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static class NoRemoveMultiset<E> extends AbstractMultiset<E> 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert implements Serializable { 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Map<E, Integer> backingMap = Maps.newHashMap(); 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public int add(E element, int occurrences) { 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(occurrences >= 0); 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Integer frequency = backingMap.get(element); 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (frequency == null) { 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert frequency = 0; 751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (occurrences == 0) { 771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return frequency; 781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(occurrences <= Integer.MAX_VALUE - frequency); 801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert backingMap.put(element, frequency + occurrences); 811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return frequency; 821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Iterator<Entry<E>> entryIterator() { 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Iterator<Map.Entry<E, Integer>> backingEntries = backingMap.entrySet().iterator(); 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new Iterator<Multiset.Entry<E>>() { 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public boolean hasNext() { 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return backingEntries.hasNext(); 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public Multiset.Entry<E> next() { 951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Map.Entry<E, Integer> mapEntry = backingEntries.next(); 961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new Multisets.AbstractEntry<E>() { 971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public E getElement() { 991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return mapEntry.getKey(); 1001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 1031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public int getCount() { 1041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Integer frequency = backingMap.get(getElement()); 1051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (frequency == null) ? 0 : frequency; 1061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }; 1081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 1111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void remove() { 1121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert backingEntries.remove(); 1131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert }; 1151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 1181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int distinctElements() { 1191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return backingMap.size(); 1201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static class SimpleAbstractMultiset<E> extends NoRemoveMultiset<E> { 1241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @SuppressWarnings("unchecked") 1251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public int remove(Object element, int occurrences) { 1261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(occurrences >= 0); 1271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Integer count = backingMap.get(element); 1281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (count == null) { 1291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return 0; 1301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else if (count > occurrences) { 1311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert backingMap.put((E) element, count - occurrences); 1321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return count; 1331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else { 1341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return backingMap.remove(element); 1351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 139