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/*
* Copyright (C) 2009 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.collect.Iterators;
import com.google.common.collect.UnmodifiableIterator;
/**
* GWT emulation of {@link SingletonImmutableSet}.
*
* @author Hayward Chan
*/
final class SingletonImmutableSet<E> extends ImmutableSet<E> {
// This reference is used both by the custom field serializer, and by the
// GWT compiler to infer the elements of the lists that needs to be
// serialized.
//
// Although this reference is non-final, it doesn't change after set creation.
E element;
SingletonImmutableSet(E element) {
this.element = checkNotNull(element);
}
@Override
public int size() {
return 1;
}
@Override
public UnmodifiableIterator<E> iterator() {
return Iterators.singletonIterator(element);
}
@Override
public boolean contains(Object object) {
return element.equals(object);
}
}
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