001    /*
002     * Copyright (c) 2006 Henri Sivonen
003     *
004     * Permission is hereby granted, free of charge, to any person obtaining a 
005     * copy of this software and associated documentation files (the "Software"), 
006     * to deal in the Software without restriction, including without limitation 
007     * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
008     * and/or sell copies of the Software, and to permit persons to whom the 
009     * Software is furnished to do so, subject to the following conditions:
010     *
011     * The above copyright notice and this permission notice shall be included in 
012     * all copies or substantial portions of the Software.
013     *
014     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
015     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
016     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
017     * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
018     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
019     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
020     * DEALINGS IN THE SOFTWARE.
021     */
022    
023    package org.whattf.datatype;
024    
025    import java.util.regex.Matcher;
026    import java.util.regex.Pattern;
027    
028    import org.relaxng.datatype.DatatypeException;
029    
030    /**
031     * 
032     * 
033     * @version $Id: Month.java 121 2006-11-18 11:51:44Z hsivonen $
034     * @author hsivonen
035     */
036    public final class Month extends AbstractDatatype {
037    
038        /**
039         * The singleton instance.
040         */
041        public static final Month THE_INSTANCE = new Month();
042    
043        /**
044         * The rexexp for this datatype.
045         */
046        private static final Pattern THE_PATTERN = Pattern.compile("^([0-9]{4,})-([0-9]{2})$");
047    
048        /**
049         * Constructor.
050         */
051        private Month() {
052            super();
053        }
054    
055        private void checkMonth(String year, String month)
056                throws DatatypeException {
057            checkMonth(Integer.parseInt(year), Integer.parseInt(month));
058        }
059    
060        private void checkMonth(int year, int month)
061                throws DatatypeException {
062            if (year < 1) {
063                throw new DatatypeException("Year cannot be less than 1.");
064            }
065            if (month < 1) {
066                throw new DatatypeException("Month cannot be less than 1.");
067            }
068            if (month > 12) {
069                throw new DatatypeException("Month cannot be greater than 12.");
070            }
071        }
072    
073        public final void checkValid(CharSequence literal)
074                throws DatatypeException {
075            Matcher m = THE_PATTERN.matcher(literal);
076            if (m.matches()) {
077                checkMonth(m.group(1), m.group(2));
078            } else {
079                throw new DatatypeException(
080                        "The literal did not satisfy the format for month.");
081            }
082        }
083    
084    }