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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.tuscany.sca.common.java.collection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;
/**
* A Map with Collection values
*/
public class CollectionMap<K, V> extends ConcurrentHashMap<K, Collection<V>> {
private static final long serialVersionUID = -8926174610229029369L;
public boolean putValue(K key, V value) {
Collection<V> collection = get(key);
if (collection == null) {
collection = createCollection();
put(key, collection);
}
return collection.add(value);
}
public boolean putValues(K key, Collection<? extends V> value) {
Collection<V> collection = get(key);
if (collection == null) {
collection = createCollection();
put(key, collection);
}
return collection.addAll(value);
}
public boolean removeValue(K key, V value) {
return removeValue(key, value, false);
}
/**
* Remove an entry from the collection for a key
* @param key The key
* @param value The value in the collection
* @param removeEmptyEntry Indicate if the entry should be removed if the collection is empty
* @return
*/
public boolean removeValue(K key, V value, boolean removeEmptyEntry) {
Collection<V> collection = get(key);
if (collection == null) {
return false;
}
boolean result = collection.remove(value);
if(removeEmptyEntry && collection.isEmpty()) {
remove(key);
}
return result;
}
protected Collection<V> createCollection() {
return new ArrayList<V>();
}
}
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