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ForwardingImmutableSet.java
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ForwardingImmutableSet.java
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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 java.util.Collection;
import java.util.Collections;
import java.util.Set;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* GWT implementation of {@link ImmutableSet} that forwards to another {@code Set} implementation.
*
* @author Hayward Chan
*/
@SuppressWarnings("serial") // Serialization only done in GWT.
public abstract class ForwardingImmutableSet<E> extends ImmutableSet<E> {
private final transient Set<E> delegate;
ForwardingImmutableSet(Set<E> delegate) {
// TODO(cpovirk): are we over-wrapping?
this.delegate = Collections.unmodifiableSet(delegate);
}
@Override
public UnmodifiableIterator<E> iterator() {
return Iterators.unmodifiableIterator(delegate.iterator());
}
@Override
public boolean contains(@Nullable Object object) {
return object != null && delegate.contains(object);
}
@Override
public boolean containsAll(Collection<?> targets) {
return delegate.containsAll(targets);
}
@Override
public int size() {
return delegate.size();
}
@Override
public boolean isEmpty() {
return delegate.isEmpty();
}
@Override
public Object[] toArray() {
return delegate.toArray();
}
@Override
public <T> T[] toArray(T[] other) {
return delegate.toArray(other);
}
@Override
public String toString() {
return delegate.toString();
}
// TODO(cpovirk): equals(), as well, in case it's any faster than Sets.equalsImpl?
@Override
public int hashCode() {
return delegate.hashCode();
}
}