001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2014, by Object Refinery Limited and Contributors.
006 *
007 * Project Info:  http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
022 * USA.
023 *
024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 * 
027 * ---------------
028 * CloneUtils.java
029 * ---------------
030 * (C) Copyright 2014, by Object Refinery Limited.
031 *
032 * Original Author:  David Gilbert (for Object Refinery Limited);
033 * Contributor(s):   -;
034 *
035 * Changes
036 * -------
037 * 08-Apr-2014 : Version 1 (DG);
038 *
039 */
040
041package org.jfree.chart.util;
042
043import java.util.ArrayList;
044import java.util.HashMap;
045import java.util.List;
046import java.util.Map;
047import org.jfree.util.ObjectUtilities;
048
049/**
050 * Utilities for cloning.
051 * 
052 * @since 1.0.18
053 */
054public class CloneUtils {
055    
056    /**
057     * Returns a list containing cloned copies of the items in the source
058     * list.
059     * 
060     * @param source  the source list (<code>null</code> not permitted).
061     * 
062     * @return A new list. 
063     */
064    public static List<?> cloneList(List<?> source) {
065        ParamChecks.nullNotPermitted(source, "source");
066        List result = new ArrayList();
067        for (Object obj: source) {
068            if (obj != null) {
069                try {
070                    result.add(ObjectUtilities.clone(obj));
071                } catch (CloneNotSupportedException ex) {
072                    throw new RuntimeException(ex);
073                }
074            } else {
075                result.add(null);
076            }
077        }
078        return result;
079    }
080    
081    /**
082     * Returns a new map that contains the same keys and cloned copied of the
083     * values.
084     * 
085     * @param source  the source map (<code>null</code> not permitted).
086     * 
087     * @return A new map. 
088     * 
089     * @since 1.0.18
090     */
091    public static Map cloneMapValues(Map source) {
092        ParamChecks.nullNotPermitted(source, "source");
093        Map result = new HashMap();
094        for (Object key : source.keySet()) {
095            Object value = source.get(key);
096            if (value != null) {
097                try {
098                    result.put(key, ObjectUtilities.clone(value));
099                } catch (CloneNotSupportedException ex) {
100                    throw new RuntimeException(ex);
101                }
102            } else {
103                result.put(key, null);
104            }
105        }
106        return result;
107    }
108   
109}