001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.commons.collections.bag;
018    
019    import java.util.Set;
020    
021    import org.apache.commons.collections.Bag;
022    import org.apache.commons.collections.collection.AbstractCollectionDecorator;
023    
024    /**
025     * Decorates another <code>Bag</code> to provide additional behaviour.
026     * <p>
027     * Methods are forwarded directly to the decorated bag.
028     *
029     * @since Commons Collections 3.0
030     * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
031     * 
032     * @author Stephen Colebourne
033     */
034    public abstract class AbstractBagDecorator
035            extends AbstractCollectionDecorator implements Bag {
036    
037        /**
038         * Constructor only used in deserialization, do not use otherwise.
039         * @since Commons Collections 3.1
040         */
041        protected AbstractBagDecorator() {
042            super();
043        }
044    
045        /**
046         * Constructor that wraps (not copies).
047         * 
048         * @param bag  the bag to decorate, must not be null
049         * @throws IllegalArgumentException if list is null
050         */
051        protected AbstractBagDecorator(Bag bag) {
052            super(bag);
053        }
054    
055        /**
056         * Gets the bag being decorated.
057         * 
058         * @return the decorated bag
059         */
060        protected Bag getBag() {
061            return (Bag) getCollection();
062        }
063    
064        //-----------------------------------------------------------------------
065        public int getCount(Object object) {
066            return getBag().getCount(object);
067        }
068    
069        public boolean add(Object object, int count) {
070            return getBag().add(object, count);
071        }
072    
073        public boolean remove(Object object, int count) {
074            return getBag().remove(object, count);
075        }
076    
077        public Set uniqueSet() {
078            return getBag().uniqueSet();
079        }
080    
081    }