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/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003-2004 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 */
package org.apache.commons.collections.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.collections.MapIterator MapIterator} * functionality and many methods for subclassing. *

* @since Commons Collections 3.0 * @version $Revision: 1.14 $ $Date: 2004/01/14 21:43:10 $ * * @author Stephen Colebourne */ 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 less than one */ public HashedMap(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 less than one * @throws IllegalArgumentException if the load factor is less than zero */ public HashedMap(int initialCapacity, 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(Map map) { super(map); } //----------------------------------------------------------------------- /** * Clones the map without cloning the keys or values. * * @return a shallow clone */ public Object clone() { return super.clone(); } /** * Write the map out using a custom routine. */ private void writeObject(ObjectOutputStream out) throws IOException { out.defaultWriteObject(); doWriteObject(out); } /** * Read the map in using a custom routine. */ private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); doReadObject(in); } }





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