/**
* Copyright 2009 Google Inc.
*
* 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 org.waveprotocol.wave.model.util;
import java.util.Set;
/**
* @author danilatos@google.com (Daniel Danilatos)
*/
public class ChainedHashSet<T> extends ChainedData<Set<T>, Set<T>> {
public static final ChainedHashSet<Object> EMPTY_ROOT = new ChainedHashSet<Object>();
@SuppressWarnings("unchecked")
public static <T> ChainedHashSet<T> emptyRoot() {
return (ChainedHashSet<T>) EMPTY_ROOT;
}
/**
* Root
*/
public ChainedHashSet() {
super(CollectionUtils.<T>hashSetDomain());
}
/**
* Chained
*/
public ChainedHashSet(ChainedHashSet<T> parent) {
super(parent);
}
/** Create a child set */
public ChainedHashSet<T> createExtension() {
return new ChainedHashSet<T>(this);
}
}