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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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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