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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.map;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Map;

/**
 * A Map implementation that is a general purpose alternative
 * to HashMap.
 * 

* This implementation improves on the JDK1.4 HashMap by adding the * {@link org.apache.commons.collections4.MapIterator MapIterator} * functionality and many methods for subclassing. *

* Note that HashedMap is not synchronized and is not thread-safe. * If you wish to use this map from multiple threads concurrently, you must use * appropriate synchronization. The simplest approach is to wrap this map * using {@link java.util.Collections#synchronizedMap(Map)}. This class may throw * exceptions when accessed by concurrent threads without synchronization. * * @since 3.0 * @version $Id: HashedMap.java 1533984 2013-10-20 21:12:51Z tn $ */ public class HashedMap extends AbstractHashedMap implements Serializable, Cloneable { /** Serialisation version */ private static final long serialVersionUID = -1788199231038721040L; /** * Constructs a new empty map with default size and load factor. */ public HashedMap() { super(DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD); } /** * Constructs a new, empty map with the specified initial capacity. * * @param initialCapacity the initial capacity * @throws IllegalArgumentException if the initial capacity is negative */ public HashedMap(final int initialCapacity) { super(initialCapacity); } /** * Constructs a new, empty map with the specified initial capacity and * load factor. * * @param initialCapacity the initial capacity * @param loadFactor the load factor * @throws IllegalArgumentException if the initial capacity is negative * @throws IllegalArgumentException if the load factor is less than zero */ public HashedMap(final int initialCapacity, final float loadFactor) { super(initialCapacity, loadFactor); } /** * Constructor copying elements from another map. * * @param map the map to copy * @throws NullPointerException if the map is null */ public HashedMap(final Map map) { super(map); } //----------------------------------------------------------------------- /** * Clones the map without cloning the keys or values. * * @return a shallow clone */ @Override public HashedMap clone() { return (HashedMap) super.clone(); } /** * Write the map out using a custom routine. */ private void writeObject(final ObjectOutputStream out) throws IOException { out.defaultWriteObject(); doWriteObject(out); } /** * Read the map in using a custom routine. */ private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); doReadObject(in); } }





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