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/*
* Copyright (C) 2018 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 com.google.common.annotations.J2ktIncompatible;
import java.util.Set;
import javax.annotation.CheckForNull;
/**
* ImmutableSet implementation backed by a JDK HashSet, used to defend against apparent hash
* flooding. This implementation is never used on the GWT client side, but it must be present there
* for serialization to work.
*
* @author Louis Wasserman
*/
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
final class JdkBackedImmutableSet<E> extends IndexedImmutableSet<E> {
private final Set<?> delegate;
private final ImmutableList<E> delegateList;
JdkBackedImmutableSet(Set<?> delegate, ImmutableList<E> delegateList) {
this.delegate = delegate;
this.delegateList = delegateList;
}
@Override
E get(int index) {
return delegateList.get(index);
}
@Override
public boolean contains(@CheckForNull Object object) {
return delegate.contains(object);
}
@Override
boolean isPartialView() {
return false;
}
@Override
public int size() {
return delegateList.size();
}
// redeclare to help optimizers with b/310253115
@SuppressWarnings("RedundantOverride")
@Override
@J2ktIncompatible // serialization
@GwtIncompatible // serialization
Object writeReplace() {
return super.writeReplace();
}
}
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