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/*
* 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 com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.io.Serializable;
import java.util.Map.Entry;
import javax.annotation.Nullable;
/**
* {@code entrySet()} implementation for {@link ImmutableMap}.
*
* @author Jesse Wilson
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
abstract class ImmutableMapEntrySet<K, V> extends ImmutableSet<Entry<K, V>> {
ImmutableMapEntrySet() {}
abstract ImmutableMap<K, V> map();
@Override
public int size() {
return map().size();
}
@Override
public boolean contains(@Nullable Object object) {
if (object instanceof Entry) {
Entry<?, ?> entry = (Entry<?, ?>) object;
V value = map().get(entry.getKey());
return value != null && value.equals(entry.getValue());
}
return false;
}
@Override
boolean isPartialView() {
return map().isPartialView();
}
@GwtIncompatible("serialization")
@Override
Object writeReplace() {
return new EntrySetSerializedForm<K, V>(map());
}
@GwtIncompatible("serialization")
private static class EntrySetSerializedForm<K, V> implements Serializable {
final ImmutableMap<K, V> map;
EntrySetSerializedForm(ImmutableMap<K, V> map) {
this.map = map;
}
Object readResolve() {
return map.entrySet();
}
private static final long serialVersionUID = 0;
}
}
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