001    /*
002     * 
003     * $Revision: 13085 $ $Date: 2008-02-06 18:27:24 +0100 (Mi, 06 Feb 2008) $
004     *
005     * This file is part of ***  M y C o R e  ***
006     * See http://www.mycore.de/ for details.
007     *
008     * This program is free software; you can use it, redistribute it
009     * and / or modify it under the terms of the GNU General Public License
010     * (GPL) as published by the Free Software Foundation; either version 2
011     * of the License or (at your option) any later version.
012     *
013     * This program is distributed in the hope that it will be useful, but
014     * WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
016     * GNU General Public License for more details.
017     *
018     * You should have received a copy of the GNU General Public License
019     * along with this program, in a file called gpl.txt or license.txt.
020     * If not, write to the Free Software Foundation Inc.,
021     * 59 Temple Place - Suite 330, Boston, MA  02111-1307 USA
022     */
023    
024    package org.mycore.backend.jdom;
025    
026    import org.mycore.common.MCRUtils;
027    
028    /**
029     * This class implements Xalan extension functions for the JDOM search.
030     * 
031     * @author Jens Kupferschmidt
032     * @version $Revision: 13085 $ $Date: 2008-02-06 18:27:24 +0100 (Mi, 06 Feb 2008) $
033     */
034    public class MCRXalanExtensions {
035        /**
036         * This method implements a XSLT function to compare two date values.
037         * 
038         * @param date_one
039         *            the date that should be compared with date_two
040         * @param date_two
041         *            the data that date_one is compared with
042         * @param compare_operator
043         *            The operator to compare in the form 'date_one compare_operator
044         *            date_two'
045         * @return true if the test is correct, else return false
046         */
047        public static boolean compareDates(String date_one, String date_two, String compare_operator) {
048            String date1iso = MCRUtils.covertDateToISO(date_one);
049            String date2iso = MCRUtils.covertDateToISO(date_two);
050    
051            if ((date1iso == null) || (date2iso == null) || (date1iso.length() == 0) || (date2iso.length() == 0)) {
052                return false;
053            }
054    
055            if ((compare_operator == null) || ((compare_operator = compare_operator.trim()).length() == 0)) {
056                return false;
057            }
058    
059            int result = date1iso.compareTo(date2iso);
060    
061            if (compare_operator.equals("=")) {
062                return (result == 0);
063            } else if (compare_operator.equals("!=")) {
064                return (result != 0);
065            } else if (compare_operator.equals("<=")) {
066                return (result <= 0);
067            } else if (compare_operator.equals(">=")) {
068                return (result >= 0);
069            } else if (compare_operator.equals("<")) {
070                return (result < 0);
071            } else if (compare_operator.equals(">")) {
072                return (result > 0);
073            } else {
074                return false;
075            }
076        }
077    }