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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 java.util.Map.Entry;
import javax.annotation.Nullable;
/**
* {@code keySet()} implementation for {@link ImmutableMap}.
*
* @author Jesse Wilson
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
final class ImmutableMapKeySet<K, V> extends ImmutableSet<K> {
private final ImmutableMap<K, V> map;
ImmutableMapKeySet(ImmutableMap<K, V> map) {
this.map = map;
}
@Override
public int size() {
return map.size();
}
@Override
public UnmodifiableIterator<K> iterator() {
return asList().iterator();
}
@Override
public boolean contains(@Nullable Object object) {
return map.containsKey(object);
}
@Override
ImmutableList<K> createAsList() {
final ImmutableList<Entry<K, V>> entryList = map.entrySet().asList();
return new ImmutableAsList<K>() {
@Override
public K get(int index) {
return entryList.get(index).getKey();
}
@Override
ImmutableCollection<K> delegateCollection() {
return ImmutableMapKeySet.this;
}
};
}
@Override
boolean isPartialView() {
return true;
}
}
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