/
AbstractMapBasedMultimap.java
1674 lines (1444 loc) · 46.6 KB
/
AbstractMapBasedMultimap.java
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/*
* Copyright (C) 2007 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.NullnessCasts.uncheckedCastNullableTToT;
import static java.util.Objects.requireNonNull;
import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Maps.ViewCachingAbstractMap;
import com.google.j2objc.annotations.WeakOuter;
import java.io.Serializable;
import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.RandomAccess;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Basic implementation of the {@link Multimap} interface. This class represents a multimap as a map
* that associates each key with a collection of values. All methods of {@link Multimap} are
* supported, including those specified as optional in the interface.
*
* <p>To implement a multimap, a subclass must define the method {@link #createCollection()}, which
* creates an empty collection of values for a key.
*
* <p>The multimap constructor takes a map that has a single entry for each distinct key. When you
* insert a key-value pair with a key that isn't already in the multimap, {@code
* AbstractMapBasedMultimap} calls {@link #createCollection()} to create the collection of values
* for that key. The subclass should not call {@link #createCollection()} directly, and a new
* instance should be created every time the method is called.
*
* <p>For example, the subclass could pass a {@link java.util.TreeMap} during construction, and
* {@link #createCollection()} could return a {@link java.util.TreeSet}, in which case the
* multimap's iterators would propagate through the keys and values in sorted order.
*
* <p>Keys and values may be null, as long as the underlying collection classes support null
* elements.
*
* <p>The collections created by {@link #createCollection()} may or may not allow duplicates. If the
* collection, such as a {@link Set}, does not support duplicates, an added key-value pair will
* replace an existing pair with the same key and value, if such a pair is present. With collections
* like {@link List} that allow duplicates, the collection will keep the existing key-value pairs
* while adding a new pair.
*
* <p>This class is not threadsafe when any concurrent operations update the multimap, even if the
* underlying map and {@link #createCollection()} method return threadsafe classes. Concurrent read
* operations will work correctly. To allow concurrent update operations, wrap your multimap with a
* call to {@link Multimaps#synchronizedMultimap}.
*
* <p>For serialization to work, the subclass must specify explicit {@code readObject} and {@code
* writeObject} methods.
*
* @author Jared Levy
* @author Louis Wasserman
*/
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class AbstractMapBasedMultimap<K extends @Nullable Object, V extends @Nullable Object>
extends AbstractMultimap<K, V> implements Serializable {
/*
* Here's an outline of the overall design.
*
* The map variable contains the collection of values associated with each
* key. When a key-value pair is added to a multimap that didn't previously
* contain any values for that key, a new collection generated by
* createCollection is added to the map. That same collection instance
* remains in the map as long as the multimap has any values for the key. If
* all values for the key are removed, the key and collection are removed
* from the map.
*
* The get method returns a WrappedCollection, which decorates the collection
* in the map (if the key is present) or an empty collection (if the key is
* not present). When the collection delegate in the WrappedCollection is
* empty, the multimap may contain subsequently added values for that key. To
* handle that situation, the WrappedCollection checks whether map contains
* an entry for the provided key, and if so replaces the delegate.
*/
private transient Map<K, Collection<V>> map;
private transient int totalSize;
/**
* Creates a new multimap that uses the provided map.
*
* @param map place to store the mapping from each key to its corresponding values
* @throws IllegalArgumentException if {@code map} is not empty
*/
protected AbstractMapBasedMultimap(Map<K, Collection<V>> map) {
checkArgument(map.isEmpty());
this.map = map;
}
/** Used during deserialization only. */
final void setMap(Map<K, Collection<V>> map) {
this.map = map;
totalSize = 0;
for (Collection<V> values : map.values()) {
checkArgument(!values.isEmpty());
totalSize += values.size();
}
}
/**
* Creates an unmodifiable, empty collection of values.
*
* <p>This is used in {@link #removeAll} on an empty key.
*/
Collection<V> createUnmodifiableEmptyCollection() {
return unmodifiableCollectionSubclass(createCollection());
}
/**
* Creates the collection of values for a single key.
*
* <p>Collections with weak, soft, or phantom references are not supported. Each call to {@code
* createCollection} should create a new instance.
*
* <p>The returned collection class determines whether duplicate key-value pairs are allowed.
*
* @return an empty collection of values
*/
abstract Collection<V> createCollection();
/**
* Creates the collection of values for an explicitly provided key. By default, it simply calls
* {@link #createCollection()}, which is the correct behavior for most implementations. The {@link
* LinkedHashMultimap} class overrides it.
*
* @param key key to associate with values in the collection
* @return an empty collection of values
*/
Collection<V> createCollection(@ParametricNullness K key) {
return createCollection();
}
Map<K, Collection<V>> backingMap() {
return map;
}
// Query Operations
@Override
public int size() {
return totalSize;
}
@Override
public boolean containsKey(@CheckForNull Object key) {
return map.containsKey(key);
}
// Modification Operations
@Override
public boolean put(@ParametricNullness K key, @ParametricNullness V value) {
Collection<V> collection = map.get(key);
if (collection == null) {
collection = createCollection(key);
if (collection.add(value)) {
totalSize++;
map.put(key, collection);
return true;
} else {
throw new AssertionError("New Collection violated the Collection spec");
}
} else if (collection.add(value)) {
totalSize++;
return true;
} else {
return false;
}
}
private Collection<V> getOrCreateCollection(@ParametricNullness K key) {
Collection<V> collection = map.get(key);
if (collection == null) {
collection = createCollection(key);
map.put(key, collection);
}
return collection;
}
// Bulk Operations
/**
* {@inheritDoc}
*
* <p>The returned collection is immutable.
*/
@Override
public Collection<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values) {
Iterator<? extends V> iterator = values.iterator();
if (!iterator.hasNext()) {
return removeAll(key);
}
// TODO(lowasser): investigate atomic failure?
Collection<V> collection = getOrCreateCollection(key);
Collection<V> oldValues = createCollection();
oldValues.addAll(collection);
totalSize -= collection.size();
collection.clear();
while (iterator.hasNext()) {
if (collection.add(iterator.next())) {
totalSize++;
}
}
return unmodifiableCollectionSubclass(oldValues);
}
/**
* {@inheritDoc}
*
* <p>The returned collection is immutable.
*/
@Override
public Collection<V> removeAll(@CheckForNull Object key) {
Collection<V> collection = map.remove(key);
if (collection == null) {
return createUnmodifiableEmptyCollection();
}
Collection<V> output = createCollection();
output.addAll(collection);
totalSize -= collection.size();
collection.clear();
return unmodifiableCollectionSubclass(output);
}
<E extends @Nullable Object> Collection<E> unmodifiableCollectionSubclass(
Collection<E> collection) {
return Collections.unmodifiableCollection(collection);
}
@Override
public void clear() {
// Clear each collection, to make previously returned collections empty.
for (Collection<V> collection : map.values()) {
collection.clear();
}
map.clear();
totalSize = 0;
}
// Views
/**
* {@inheritDoc}
*
* <p>The returned collection is not serializable.
*/
@Override
public Collection<V> get(@ParametricNullness K key) {
Collection<V> collection = map.get(key);
if (collection == null) {
collection = createCollection(key);
}
return wrapCollection(key, collection);
}
/**
* Generates a decorated collection that remains consistent with the values in the multimap for
* the provided key. Changes to the multimap may alter the returned collection, and vice versa.
*/
Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
return new WrappedCollection(key, collection, null);
}
final List<V> wrapList(
@ParametricNullness K key, List<V> list, @CheckForNull WrappedCollection ancestor) {
return (list instanceof RandomAccess)
? new RandomAccessWrappedList(key, list, ancestor)
: new WrappedList(key, list, ancestor);
}
/**
* Collection decorator that stays in sync with the multimap values for a key. There are two kinds
* of wrapped collections: full and subcollections. Both have a delegate pointing to the
* underlying collection class.
*
* <p>Full collections, identified by a null ancestor field, contain all multimap values for a
* given key. Its delegate is a value in {@link AbstractMapBasedMultimap#map} whenever the
* delegate is non-empty. The {@code refreshIfEmpty}, {@code removeIfEmpty}, and {@code addToMap}
* methods ensure that the {@code WrappedCollection} and map remain consistent.
*
* <p>A subcollection, such as a sublist, contains some of the values for a given key. Its
* ancestor field points to the full wrapped collection with all values for the key. The
* subcollection {@code refreshIfEmpty}, {@code removeIfEmpty}, and {@code addToMap} methods call
* the corresponding methods of the full wrapped collection.
*/
@WeakOuter
class WrappedCollection extends AbstractCollection<V> {
@ParametricNullness final K key;
Collection<V> delegate;
@CheckForNull final WrappedCollection ancestor;
@CheckForNull final Collection<V> ancestorDelegate;
WrappedCollection(
@ParametricNullness K key,
Collection<V> delegate,
@CheckForNull WrappedCollection ancestor) {
this.key = key;
this.delegate = delegate;
this.ancestor = ancestor;
this.ancestorDelegate = (ancestor == null) ? null : ancestor.getDelegate();
}
/**
* If the delegate collection is empty, but the multimap has values for the key, replace the
* delegate with the new collection for the key.
*
* <p>For a subcollection, refresh its ancestor and validate that the ancestor delegate hasn't
* changed.
*/
void refreshIfEmpty() {
if (ancestor != null) {
ancestor.refreshIfEmpty();
if (ancestor.getDelegate() != ancestorDelegate) {
throw new ConcurrentModificationException();
}
} else if (delegate.isEmpty()) {
Collection<V> newDelegate = map.get(key);
if (newDelegate != null) {
delegate = newDelegate;
}
}
}
/**
* If collection is empty, remove it from {@code AbstractMapBasedMultimap.this.map}. For
* subcollections, check whether the ancestor collection is empty.
*/
void removeIfEmpty() {
if (ancestor != null) {
ancestor.removeIfEmpty();
} else if (delegate.isEmpty()) {
map.remove(key);
}
}
@ParametricNullness
K getKey() {
return key;
}
/**
* Add the delegate to the map. Other {@code WrappedCollection} methods should call this method
* after adding elements to a previously empty collection.
*
* <p>Subcollection add the ancestor's delegate instead.
*/
void addToMap() {
if (ancestor != null) {
ancestor.addToMap();
} else {
map.put(key, delegate);
}
}
@Override
public int size() {
refreshIfEmpty();
return delegate.size();
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object == this) {
return true;
}
refreshIfEmpty();
return delegate.equals(object);
}
@Override
public int hashCode() {
refreshIfEmpty();
return delegate.hashCode();
}
@Override
public String toString() {
refreshIfEmpty();
return delegate.toString();
}
Collection<V> getDelegate() {
return delegate;
}
@Override
public Iterator<V> iterator() {
refreshIfEmpty();
return new WrappedIterator();
}
/** Collection iterator for {@code WrappedCollection}. */
class WrappedIterator implements Iterator<V> {
final Iterator<V> delegateIterator;
final Collection<V> originalDelegate = delegate;
WrappedIterator() {
delegateIterator = iteratorOrListIterator(delegate);
}
WrappedIterator(Iterator<V> delegateIterator) {
this.delegateIterator = delegateIterator;
}
/**
* If the delegate changed since the iterator was created, the iterator is no longer valid.
*/
void validateIterator() {
refreshIfEmpty();
if (delegate != originalDelegate) {
throw new ConcurrentModificationException();
}
}
@Override
public boolean hasNext() {
validateIterator();
return delegateIterator.hasNext();
}
@Override
@ParametricNullness
public V next() {
validateIterator();
return delegateIterator.next();
}
@Override
public void remove() {
delegateIterator.remove();
totalSize--;
removeIfEmpty();
}
Iterator<V> getDelegateIterator() {
validateIterator();
return delegateIterator;
}
}
@Override
public boolean add(@ParametricNullness V value) {
refreshIfEmpty();
boolean wasEmpty = delegate.isEmpty();
boolean changed = delegate.add(value);
if (changed) {
totalSize++;
if (wasEmpty) {
addToMap();
}
}
return changed;
}
@CheckForNull
WrappedCollection getAncestor() {
return ancestor;
}
// The following methods are provided for better performance.
@Override
public boolean addAll(Collection<? extends V> collection) {
if (collection.isEmpty()) {
return false;
}
int oldSize = size(); // calls refreshIfEmpty
boolean changed = delegate.addAll(collection);
if (changed) {
int newSize = delegate.size();
totalSize += (newSize - oldSize);
if (oldSize == 0) {
addToMap();
}
}
return changed;
}
@Override
public boolean contains(@CheckForNull Object o) {
refreshIfEmpty();
return delegate.contains(o);
}
@Override
public boolean containsAll(Collection<?> c) {
refreshIfEmpty();
return delegate.containsAll(c);
}
@Override
public void clear() {
int oldSize = size(); // calls refreshIfEmpty
if (oldSize == 0) {
return;
}
delegate.clear();
totalSize -= oldSize;
removeIfEmpty(); // maybe shouldn't be removed if this is a sublist
}
@Override
public boolean remove(@CheckForNull Object o) {
refreshIfEmpty();
boolean changed = delegate.remove(o);
if (changed) {
totalSize--;
removeIfEmpty();
}
return changed;
}
@Override
public boolean removeAll(Collection<?> c) {
if (c.isEmpty()) {
return false;
}
int oldSize = size(); // calls refreshIfEmpty
boolean changed = delegate.removeAll(c);
if (changed) {
int newSize = delegate.size();
totalSize += (newSize - oldSize);
removeIfEmpty();
}
return changed;
}
@Override
public boolean retainAll(Collection<?> c) {
checkNotNull(c);
int oldSize = size(); // calls refreshIfEmpty
boolean changed = delegate.retainAll(c);
if (changed) {
int newSize = delegate.size();
totalSize += (newSize - oldSize);
removeIfEmpty();
}
return changed;
}
}
private static <E extends @Nullable Object> Iterator<E> iteratorOrListIterator(
Collection<E> collection) {
return (collection instanceof List)
? ((List<E>) collection).listIterator()
: collection.iterator();
}
/** Set decorator that stays in sync with the multimap values for a key. */
@WeakOuter
class WrappedSet extends WrappedCollection implements Set<V> {
WrappedSet(@ParametricNullness K key, Set<V> delegate) {
super(key, delegate, null);
}
@Override
public boolean removeAll(Collection<?> c) {
if (c.isEmpty()) {
return false;
}
int oldSize = size(); // calls refreshIfEmpty
// Guava issue 1013: AbstractSet and most JDK set implementations are
// susceptible to quadratic removeAll performance on lists;
// use a slightly smarter implementation here
boolean changed = Sets.removeAllImpl((Set<V>) delegate, c);
if (changed) {
int newSize = delegate.size();
totalSize += (newSize - oldSize);
removeIfEmpty();
}
return changed;
}
}
/** SortedSet decorator that stays in sync with the multimap values for a key. */
@WeakOuter
class WrappedSortedSet extends WrappedCollection implements SortedSet<V> {
WrappedSortedSet(
@ParametricNullness K key,
SortedSet<V> delegate,
@CheckForNull WrappedCollection ancestor) {
super(key, delegate, ancestor);
}
SortedSet<V> getSortedSetDelegate() {
return (SortedSet<V>) getDelegate();
}
@Override
@CheckForNull
public Comparator<? super V> comparator() {
return getSortedSetDelegate().comparator();
}
@Override
@ParametricNullness
public V first() {
refreshIfEmpty();
return getSortedSetDelegate().first();
}
@Override
@ParametricNullness
public V last() {
refreshIfEmpty();
return getSortedSetDelegate().last();
}
@Override
public SortedSet<V> headSet(@ParametricNullness V toElement) {
refreshIfEmpty();
return new WrappedSortedSet(
getKey(),
getSortedSetDelegate().headSet(toElement),
(getAncestor() == null) ? this : getAncestor());
}
@Override
public SortedSet<V> subSet(@ParametricNullness V fromElement, @ParametricNullness V toElement) {
refreshIfEmpty();
return new WrappedSortedSet(
getKey(),
getSortedSetDelegate().subSet(fromElement, toElement),
(getAncestor() == null) ? this : getAncestor());
}
@Override
public SortedSet<V> tailSet(@ParametricNullness V fromElement) {
refreshIfEmpty();
return new WrappedSortedSet(
getKey(),
getSortedSetDelegate().tailSet(fromElement),
(getAncestor() == null) ? this : getAncestor());
}
}
@WeakOuter
class WrappedNavigableSet extends WrappedSortedSet implements NavigableSet<V> {
WrappedNavigableSet(
@ParametricNullness K key,
NavigableSet<V> delegate,
@CheckForNull WrappedCollection ancestor) {
super(key, delegate, ancestor);
}
@Override
NavigableSet<V> getSortedSetDelegate() {
return (NavigableSet<V>) super.getSortedSetDelegate();
}
@Override
@CheckForNull
public V lower(@ParametricNullness V v) {
return getSortedSetDelegate().lower(v);
}
@Override
@CheckForNull
public V floor(@ParametricNullness V v) {
return getSortedSetDelegate().floor(v);
}
@Override
@CheckForNull
public V ceiling(@ParametricNullness V v) {
return getSortedSetDelegate().ceiling(v);
}
@Override
@CheckForNull
public V higher(@ParametricNullness V v) {
return getSortedSetDelegate().higher(v);
}
@Override
@CheckForNull
public V pollFirst() {
return Iterators.pollNext(iterator());
}
@Override
@CheckForNull
public V pollLast() {
return Iterators.pollNext(descendingIterator());
}
private NavigableSet<V> wrap(NavigableSet<V> wrapped) {
return new WrappedNavigableSet(key, wrapped, (getAncestor() == null) ? this : getAncestor());
}
@Override
public NavigableSet<V> descendingSet() {
return wrap(getSortedSetDelegate().descendingSet());
}
@Override
public Iterator<V> descendingIterator() {
return new WrappedIterator(getSortedSetDelegate().descendingIterator());
}
@Override
public NavigableSet<V> subSet(
@ParametricNullness V fromElement,
boolean fromInclusive,
@ParametricNullness V toElement,
boolean toInclusive) {
return wrap(
getSortedSetDelegate().subSet(fromElement, fromInclusive, toElement, toInclusive));
}
@Override
public NavigableSet<V> headSet(@ParametricNullness V toElement, boolean inclusive) {
return wrap(getSortedSetDelegate().headSet(toElement, inclusive));
}
@Override
public NavigableSet<V> tailSet(@ParametricNullness V fromElement, boolean inclusive) {
return wrap(getSortedSetDelegate().tailSet(fromElement, inclusive));
}
}
/** List decorator that stays in sync with the multimap values for a key. */
@WeakOuter
class WrappedList extends WrappedCollection implements List<V> {
WrappedList(
@ParametricNullness K key, List<V> delegate, @CheckForNull WrappedCollection ancestor) {
super(key, delegate, ancestor);
}
List<V> getListDelegate() {
return (List<V>) getDelegate();
}
@Override
public boolean addAll(int index, Collection<? extends V> c) {
if (c.isEmpty()) {
return false;
}
int oldSize = size(); // calls refreshIfEmpty
boolean changed = getListDelegate().addAll(index, c);
if (changed) {
int newSize = getDelegate().size();
totalSize += (newSize - oldSize);
if (oldSize == 0) {
addToMap();
}
}
return changed;
}
@Override
@ParametricNullness
public V get(int index) {
refreshIfEmpty();
return getListDelegate().get(index);
}
@Override
@ParametricNullness
public V set(int index, @ParametricNullness V element) {
refreshIfEmpty();
return getListDelegate().set(index, element);
}
@Override
public void add(int index, @ParametricNullness V element) {
refreshIfEmpty();
boolean wasEmpty = getDelegate().isEmpty();
getListDelegate().add(index, element);
totalSize++;
if (wasEmpty) {
addToMap();
}
}
@Override
@ParametricNullness
public V remove(int index) {
refreshIfEmpty();
V value = getListDelegate().remove(index);
totalSize--;
removeIfEmpty();
return value;
}
@Override
public int indexOf(@CheckForNull Object o) {
refreshIfEmpty();
return getListDelegate().indexOf(o);
}
@Override
public int lastIndexOf(@CheckForNull Object o) {
refreshIfEmpty();
return getListDelegate().lastIndexOf(o);
}
@Override
public ListIterator<V> listIterator() {
refreshIfEmpty();
return new WrappedListIterator();
}
@Override
public ListIterator<V> listIterator(int index) {
refreshIfEmpty();
return new WrappedListIterator(index);
}
@Override
public List<V> subList(int fromIndex, int toIndex) {
refreshIfEmpty();
return wrapList(
getKey(),
getListDelegate().subList(fromIndex, toIndex),
(getAncestor() == null) ? this : getAncestor());
}
/** ListIterator decorator. */
private class WrappedListIterator extends WrappedIterator implements ListIterator<V> {
WrappedListIterator() {}
public WrappedListIterator(int index) {
super(getListDelegate().listIterator(index));
}
private ListIterator<V> getDelegateListIterator() {
return (ListIterator<V>) getDelegateIterator();
}
@Override
public boolean hasPrevious() {
return getDelegateListIterator().hasPrevious();
}
@Override
@ParametricNullness
public V previous() {
return getDelegateListIterator().previous();
}
@Override
public int nextIndex() {
return getDelegateListIterator().nextIndex();
}
@Override
public int previousIndex() {
return getDelegateListIterator().previousIndex();
}
@Override
public void set(@ParametricNullness V value) {
getDelegateListIterator().set(value);
}
@Override
public void add(@ParametricNullness V value) {
boolean wasEmpty = isEmpty();
getDelegateListIterator().add(value);
totalSize++;
if (wasEmpty) {
addToMap();
}
}
}
}
/**
* List decorator that stays in sync with the multimap values for a key and supports rapid random
* access.
*/
private class RandomAccessWrappedList extends WrappedList implements RandomAccess {
RandomAccessWrappedList(
@ParametricNullness K key, List<V> delegate, @CheckForNull WrappedCollection ancestor) {
super(key, delegate, ancestor);
}
}
@Override
Set<K> createKeySet() {
return new KeySet(map);
}
final Set<K> createMaybeNavigableKeySet() {
if (map instanceof NavigableMap) {
return new NavigableKeySet((NavigableMap<K, Collection<V>>) map);
} else if (map instanceof SortedMap) {
return new SortedKeySet((SortedMap<K, Collection<V>>) map);
} else {
return new KeySet(map);
}
}
@WeakOuter
private class KeySet extends Maps.KeySet<K, Collection<V>> {
KeySet(final Map<K, Collection<V>> subMap) {
super(subMap);
}
@Override
public Iterator<K> iterator() {
final Iterator<Entry<K, Collection<V>>> entryIterator = map().entrySet().iterator();
return new Iterator<K>() {
@CheckForNull Entry<K, Collection<V>> entry;
@Override
public boolean hasNext() {
return entryIterator.hasNext();
}
@Override
@ParametricNullness
public K next() {
entry = entryIterator.next();
return entry.getKey();
}
@Override
public void remove() {
checkState(entry != null, "no calls to next() since the last call to remove()");
Collection<V> collection = entry.getValue();
entryIterator.remove();
totalSize -= collection.size();
collection.clear();
entry = null;
}
};
}
// The following methods are included for better performance.
@Override
public boolean remove(@CheckForNull Object key) {
int count = 0;
Collection<V> collection = map().remove(key);
if (collection != null) {
count = collection.size();
collection.clear();
totalSize -= count;
}
return count > 0;
}
@Override
public void clear() {
Iterators.clear(iterator());
}
@Override
public boolean containsAll(Collection<?> c) {
return map().keySet().containsAll(c);
}
@Override
public boolean equals(@CheckForNull Object object) {
return this == object || this.map().keySet().equals(object);
}