/*
 * Copyright (C) 2008 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.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.j2objc.annotations.Weak;
import java.io.Serializable;
import java.util.Map.Entry;
import java.util.Spliterator;
import java.util.function.Consumer;
import org.checkerframework.checker.nullness.qual.Nullable;

values() implementation for ImmutableMap.
Author:Jesse Wilson, Kevin Bourrillion
/** * {@code values()} implementation for {@link ImmutableMap}. * * @author Jesse Wilson * @author Kevin Bourrillion */
@GwtCompatible(emulated = true) final class ImmutableMapValues<K, V> extends ImmutableCollection<V> { @Weak private final ImmutableMap<K, V> map; ImmutableMapValues(ImmutableMap<K, V> map) { this.map = map; } @Override public int size() { return map.size(); } @Override public UnmodifiableIterator<V> iterator() { return new UnmodifiableIterator<V>() { final UnmodifiableIterator<Entry<K, V>> entryItr = map.entrySet().iterator(); @Override public boolean hasNext() { return entryItr.hasNext(); } @Override public V next() { return entryItr.next().getValue(); } }; } @Override public Spliterator<V> spliterator() { return CollectSpliterators.map(map.entrySet().spliterator(), Entry::getValue); } @Override public boolean contains(@Nullable Object object) { return object != null && Iterators.contains(iterator(), object); } @Override boolean isPartialView() { return true; } @Override public ImmutableList<V> asList() { final ImmutableList<Entry<K, V>> entryList = map.entrySet().asList(); return new ImmutableAsList<V>() { @Override public V get(int index) { return entryList.get(index).getValue(); } @Override ImmutableCollection<V> delegateCollection() { return ImmutableMapValues.this; } }; } @GwtIncompatible // serialization @Override public void forEach(Consumer<? super V> action) { checkNotNull(action); map.forEach((k, v) -> action.accept(v)); } @GwtIncompatible // serialization @Override Object writeReplace() { return new SerializedForm<V>(map); } @GwtIncompatible // serialization private static class SerializedForm<V> implements Serializable { final ImmutableMap<?, V> map; SerializedForm(ImmutableMap<?, V> map) { this.map = map; } Object readResolve() { return map.values(); } private static final long serialVersionUID = 0; } }