100 lines
2.2 KiB
Java
100 lines
2.2 KiB
Java
/*
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* Copyright (C) 2008 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import java.io.Serializable;
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import java.util.Map.Entry;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtCompatible;
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import com.google.common.annotations.GwtIncompatible;
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/**
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* {@code keySet()} implementation for {@link ImmutableMap}.
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*
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* @author Jesse Wilson
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* @author Kevin Bourrillion
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*/
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@GwtCompatible(emulated = true)
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final class ImmutableMapKeySet<K, V> extends ImmutableSet<K> {
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private final ImmutableMap<K, V> map;
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ImmutableMapKeySet(ImmutableMap<K, V> map) {
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this.map = map;
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}
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@Override
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public int size() {
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return map.size();
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}
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@Override
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public UnmodifiableIterator<K> iterator() {
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return asList().iterator();
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}
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@Override
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public boolean contains(@Nullable Object object) {
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return map.containsKey(object);
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}
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@Override
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ImmutableList<K> createAsList() {
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final ImmutableList<Entry<K, V>> entryList = map.entrySet().asList();
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return new ImmutableAsList<K>() {
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@Override
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public K get(int index) {
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return entryList.get(index).getKey();
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}
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@Override
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ImmutableCollection<K> delegateCollection() {
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return ImmutableMapKeySet.this;
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}
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};
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}
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@Override
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boolean isPartialView() {
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return true;
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}
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@GwtIncompatible("serialization")
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@Override
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Object writeReplace() {
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return new KeySetSerializedForm<K>(map);
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}
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@GwtIncompatible("serialization")
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private static class KeySetSerializedForm<K> implements Serializable {
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final ImmutableMap<K, ?> map;
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KeySetSerializedForm(ImmutableMap<K, ?> map) {
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this.map = map;
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}
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Object readResolve() {
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return map.keySet();
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}
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private static final long serialVersionUID = 0;
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}
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}
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