objectkeycomparator.java

java 写的一个新闻发布系统

package org.jahia.content;

import java.util.Comparator;
import org.jahia.utils.*;

/**
 * Title:        Jahia
 * Description:  This class is used to define a comparator to be used in all
 * sorts of sorted Java collections such as TreeSets, SortedLists, etc...
 * Copyright:    Copyright (c) 2002
 * Company:      Jahia Ltd
 * @author Serge Huber
 * @version 1.0
 */

public class ObjectKeyComparator implements Comparator {

    public ObjectKeyComparator() {
    }

    public int compare(Object o1, Object o2) {
        if ((o1 instanceof ObjectKey) && (o2 instanceof ObjectKey)) {
            ObjectKey key1 = (ObjectKey) o1;
            ObjectKey key2 = (ObjectKey) o2;
            return key1.getKey().compareTo(key2.getKey());
        } else {
            JahiaConsole.println("ObjectKeyComparator.compare",
                                 "Comparator called on non ObjectKey objects, returning -1...");
            return -1; // default is keep order
        }
    }

    /**
     * Must only return true if the passed object is a comparator and has the
     * same order as this one, so we simply test if it is an instance of this
     * comparator class...
     */
    public boolean equals(Object obj) {
        if (obj instanceof ObjectKeyComparator) {
            return true;
        } else {
            return false;
        }
    }
}