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
015package org.apache.tapestry.form.translator;
016
017import java.text.DateFormatSymbols;
018import java.text.Format;
019import java.text.SimpleDateFormat;
020import java.util.Locale;
021
022import org.apache.tapestry.valid.ValidationConstraint;
023import 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 */
031public 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}