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Diffstat (limited to 'java/java/cluster/src/org/apache/qpid/server/cluster/util/MultiValuedMap.java')
-rw-r--r-- | java/java/cluster/src/org/apache/qpid/server/cluster/util/MultiValuedMap.java | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/java/java/cluster/src/org/apache/qpid/server/cluster/util/MultiValuedMap.java b/java/java/cluster/src/org/apache/qpid/server/cluster/util/MultiValuedMap.java new file mode 100644 index 0000000000..ebe1fe47dd --- /dev/null +++ b/java/java/cluster/src/org/apache/qpid/server/cluster/util/MultiValuedMap.java @@ -0,0 +1,61 @@ +/* + * + * 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>(); + } +} |