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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* 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.apache.qpid.server.cluster.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* Maps a key to a collection of values
*
*/
public class MultiValuedMap<K, V>
{
private Map<K, Collection<V>> _map = new HashMap<K, Collection<V>>();
public boolean add(K key, V value)
{
Collection<V> values = get(key);
if (values == null)
{
values = createList();
_map.put(key, values);
}
return values.add(value);
}
public Collection<V> get(K key)
{
return _map.get(key);
}
public Collection<V> remove(K key)
{
return _map.remove(key);
}
protected Collection<V> createList()
{
return new ArrayList<V>();
}
}
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