001    // Copyright 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.form.translator;
016    
017    import java.text.DateFormatSymbols;
018    import java.text.Format;
019    import java.text.SimpleDateFormat;
020    import java.util.Locale;
021    
022    import org.apache.tapestry.valid.ValidationConstraint;
023    import org.apache.tapestry.valid.ValidationStrings;
024    
025    /**
026     * A {@link java.text.SimpleDateFormat}-based {@link Translator} implementation.
027     * 
028     * @author Paul Ferraro
029     * @since 4.0
030     */
031    public class DateTranslator extends FormatTranslator
032    {
033    
034        public DateTranslator()
035        {
036        }
037    
038        // Needed until HIVEMIND-134 fix is available
039        public DateTranslator(String initializer)
040        {
041            super(initializer);
042        }
043    
044        /**
045         * @see org.apache.tapestry.form.translator.FormatTranslator#defaultPattern()
046         */
047        protected String defaultPattern()
048        {
049            return "MM/dd/yyyy";
050        }
051    
052        /**
053         * @see org.apache.tapestry.form.translator.FormatTranslator#getFormat(java.util.Locale)
054         */
055        protected Format getFormat(Locale locale)
056        {
057            return getDateFormat(locale);
058        }
059    
060        public SimpleDateFormat getDateFormat(Locale locale)
061        {
062            return new SimpleDateFormat(getPattern(), new DateFormatSymbols(locale));
063        }
064    
065        /**
066         * @see org.apache.tapestry.form.translator.FormatTranslator#getMessageKey()
067         */
068        protected String getMessageKey()
069        {
070            return ValidationStrings.INVALID_DATE;
071        }
072    
073        /**
074         * @see org.apache.tapestry.form.translator.AbstractTranslator#getMessageParameters(java.util.Locale,
075         *      java.lang.String)
076         */
077        protected Object[] getMessageParameters(Locale locale, String label)
078        {
079            String pattern = getDateFormat(locale).toLocalizedPattern().toUpperCase(locale);
080    
081            return new Object[]
082            { label, pattern };
083        }
084    
085        /**
086         * @see org.apache.tapestry.form.translator.FormatTranslator#getConstraint()
087         */
088        protected ValidationConstraint getConstraint()
089        {
090            return ValidationConstraint.DATE_FORMAT;
091        }
092    }