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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.commons.collections4.bag;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Collection;
import java.util.HashMap;

/**
 * Implements {@code Bag}, using a {@link HashMap} to provide the
 * data storage. This is the standard implementation of a bag.
 * 

* A {@code Bag} stores each object in the collection together with a * count of occurrences. Extra methods on the interface allow multiple copies * of an object to be added or removed at once. It is important to read the * interface javadoc carefully as several methods violate the * {@link Collection} interface specification. * * @since 3.0 (previously in main package v2.0) * @version $Id: HashBag.java 1685902 2015-06-16 20:13:13Z tn $ */ public class HashBag extends AbstractMapBag implements Serializable { /** Serial version lock */ private static final long serialVersionUID = -6561115435802554013L; /** * Constructs an empty {@link HashBag}. */ public HashBag() { super(new HashMap()); } /** * Constructs a bag containing all the members of the given collection. * * @param coll a collection to copy into this bag */ public HashBag(final Collection coll) { this(); addAll(coll); } //----------------------------------------------------------------------- /** * Write the bag out using a custom routine. */ private void writeObject(final ObjectOutputStream out) throws IOException { out.defaultWriteObject(); super.doWriteObject(out); } /** * Read the bag in using a custom routine. */ private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); super.doReadObject(new HashMap(), in); } }





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