ConcurrentHashMultimap implements Multimap<K, V> { @Override public boolean containsValue(@Nullable Object value) { if (value == null) { return false; } final Object id = valueIdentityExtractor.apply((V) value); return entries.entrySet().stream().map(Map.Entry::getValue).anyMatch(values -> values.containsKey(id)); } ConcurrentHashMultimap(ValueIdentityExtractor<V> valueIdentityExtractor, ConflictResolver<V> conflictResolver); @Override boolean put(@Nullable K key, @Nullable V value); @Override boolean remove(@Nullable Object key, @Nullable Object value); boolean removeIf(K key, V value, Predicate<V> match); @Override boolean putAll(@Nullable K key, Iterable<? extends V> values); @Override boolean putAll(Multimap<? extends K, ? extends V> values); @Override Collection<V> replaceValues(@Nullable K key, Iterable<? extends V> values); @Override Collection<V> removeAll(@Nullable Object key); @Override void clear(); @Override Collection<V> get(@Nullable K key); @Override Set<K> keySet(); @Override Multiset<K> keys(); @Override Collection<V> values(); @Override Collection<Map.Entry<K, V>> entries(); @Override int size(); @Override boolean isEmpty(); @Override boolean containsKey(@Nullable Object key); @Override boolean containsValue(@Nullable Object value); @Override boolean containsEntry(@Nullable Object key, @Nullable Object value); @Override Map<K, Collection<V>> asMap();  }
@Test public void containsValue() throws Exception { multiMap.putAll(ImmutableListMultimap.of( "first", new TestEntity("1", "v1"), "second", new TestEntity("2", "v2"), "second", new TestEntity("3", "v3") )); assertThat(multiMap.containsValue(new TestEntity("1", "v1"))).isTrue(); assertThat(multiMap.containsValue(new TestEntity("2", "v2"))).isTrue(); assertThat(multiMap.containsValue(new TestEntity("3", "v3"))).isTrue(); }