/** * Licensed under the Artistic License; you may not use this file * except in compliance with the License. * You may obtain a copy of the License at * *      http://displaytag.sourceforge.net/license.html * * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */package org.displaytag.model;import java.text.Collator;import java.util.Comparator;/** * Default comparator. Was previously part of RowSorter. * @author fguist * @author rapruitt * @version $Revision: 1085 $ ($Author: rapruitt $) */public class DefaultComparator implements Comparator{    /**     * Use this collator.     */    private Collator collator;    /**     * Instantiate a default comparator with no collator specified.     */    public DefaultComparator()    {        this(Collator.getInstance());    }    /**     * Instantiate a default comparator with a specified collator.     * @param collatorToUse collator instance     */    public DefaultComparator(Collator collatorToUse)    {        this.collator = collatorToUse;        collator.setStrength(Collator.PRIMARY); // ignore case and accents    }    /**     * Compares two given objects. Not comparable objects are compared using their string representation. String     * comparisons are done using a Collator.     * @param object1 first parameter     * @param object2 second parameter     * @return the value     */    public int compare(Object object1, Object object2)    {        int returnValue;        if (object1 instanceof String && object2 instanceof String)        {            returnValue = collator.compare(object1, object2);        }        else if (object1 instanceof Comparable && object2 instanceof Comparable)        {            returnValue = ((Comparable) object1).compareTo(object2);        }        else        {            // if object are not null and don't implement comparable, compare using string values            returnValue = collator.compare(object1.toString(), object2.toString());        }        return returnValue;    }}