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.Pattern;
026    
027    /**
028     * This datatype shall accept strings that conform to the format specified for 
029     * <a href='http://whatwg.org/specs/web-forms/current-work/#date'><code>date</code></a> 
030     * inputs in Web Forms 2.0.
031     * <p>This datatype must not accept the empty string.
032     * 
033     * @version $Id: Date.java 121 2006-11-18 11:51:44Z hsivonen $
034     * @author hsivonen
035     */
036    public final class Date extends AbstractDatetime {
037        
038        /**
039         * The singleton instance.
040         */
041        public static final Date THE_INSTANCE = new Date();
042        
043        /**
044         * The rexexp for this datatype.
045         */
046        private static final Pattern THE_PATTERN = Pattern.compile("^([0-9]{4,})-([0-9]{2})-([0-9]{2})$");
047    
048        /**
049         * Constructor.
050         */
051        private Date() {
052            super();
053        }    
054        
055        /**
056         * Returns the regexp for this datatype.
057         * 
058         * @return the regexp for this datatype
059         * @see org.whattf.datatype.AbstractDatetime#getPattern()
060         */
061        protected final Pattern getPattern() {
062            return THE_PATTERN;
063        }
064    }