    001/*
    002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.util;
    022
    023import java.util.IdentityHashMap;
    024import java.util.Map;
    025import java.util.Set;
    026
    027/**
    028 *
    029 */
    030public class EnumMultiMap<V> extends SetMultiMap<Enum, V>
    031  {
    032  public EnumMultiMap()
    033    {
    034    }
    035
    036  public EnumMultiMap( EnumMultiMap map )
    037    {
    038    addAll( map );
    039    }
    040
    041  @Override
    042  protected Map<Enum, Set<V>> createMap()
    043    {
    044    return new IdentityHashMap<>();
    045    }
    046
    047  @Override
    048  protected Set<V> createCollection()
    049    {
    050    return Util.createIdentitySet();
    051    }
    052  }