1 /* 2 * Copyright (C) 2013 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 15 package com.google.common.collect; 16 17 import static com.google.common.base.Preconditions.checkNotNull; 18 19 import com.google.common.annotations.GwtCompatible; 20 import com.google.common.base.Objects; 21 import com.google.common.base.Predicate; 22 import com.google.common.base.Predicates; 23 24 import java.util.AbstractCollection; 25 import java.util.Collection; 26 import java.util.Iterator; 27 import java.util.Map; 28 import java.util.Map.Entry; 29 30 import javax.annotation.Nullable; 31 32 /** 33 * Implementation for {@link FilteredMultimap#values()}. 34 * 35 * @author Louis Wasserman 36 */ 37 @GwtCompatible 38 final class FilteredMultimapValues<K, V> extends AbstractCollection<V> { 39 private final FilteredMultimap<K, V> multimap; 40 41 FilteredMultimapValues(FilteredMultimap<K, V> multimap) { 42 this.multimap = checkNotNull(multimap); 43 } 44 45 @Override 46 public Iterator<V> iterator() { 47 return Maps.valueIterator(multimap.entries().iterator()); 48 } 49 50 @Override 51 public boolean contains(@Nullable Object o) { 52 return multimap.containsValue(o); 53 } 54 55 @Override 56 public int size() { 57 return multimap.size(); 58 } 59 60 @Override 61 public boolean remove(@Nullable Object o) { 62 Predicate<? super Entry<K, V>> entryPredicate = multimap.entryPredicate(); 63 for (Iterator<Entry<K, V>> unfilteredItr = multimap.unfiltered().entries().iterator(); 64 unfilteredItr.hasNext();) { 65 Map.Entry<K, V> entry = unfilteredItr.next(); 66 if (entryPredicate.apply(entry) && Objects.equal(entry.getValue(), o)) { 67 unfilteredItr.remove(); 68 return true; 69 } 70 } 71 return false; 72 } 73 74 @Override 75 public boolean removeAll(Collection<?> c) { 76 return Iterables.removeIf(multimap.unfiltered().entries(), 77 // explicit <Entry<K, V>> is required to build with JDK6 78 Predicates.<Entry<K, V>>and(multimap.entryPredicate(), 79 Maps.<V>valuePredicateOnEntries(Predicates.in(c)))); 80 } 81 82 @Override 83 public boolean retainAll(Collection<?> c) { 84 return Iterables.removeIf(multimap.unfiltered().entries(), 85 // explicit <Entry<K, V>> is required to build with JDK6 86 Predicates.<Entry<K, V>>and(multimap.entryPredicate(), 87 Maps.<V>valuePredicateOnEntries(Predicates.not(Predicates.in(c))))); 88 } 89 90 @Override 91 public void clear() { 92 multimap.clear(); 93 } 94 } 95
