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.Format;
018    import java.text.ParseException;
019    import java.util.Locale;
020    
021    import org.apache.hivemind.HiveMind;
022    import org.apache.hivemind.util.PropertyUtils;
023    import org.apache.tapestry.form.IFormComponent;
024    import org.apache.tapestry.form.ValidationMessages;
025    import org.apache.tapestry.valid.ValidationConstraint;
026    import org.apache.tapestry.valid.ValidatorException;
027    
028    /**
029     * Abstract {@link Translator} implementation for {@link java.text.Format}-based translators.
030     * 
031     * @author Paul Ferraro
032     * @since 4.0
033     */
034    public abstract class FormatTranslator extends AbstractTranslator
035    {
036        private String _pattern;
037    
038        protected abstract String defaultPattern();
039    
040        /**
041         * @see org.apache.tapestry.form.translator.AbstractTranslator#formatObject(org.apache.tapestry.form.IFormComponent,
042         *      Locale, java.lang.Object)
043         */
044        protected String formatObject(IFormComponent field, Locale locale, Object object)
045        {
046            // Get a new format each time, because (a) have to account for locale and (b) formatters are
047            // not thread safe.
048    
049            Format format = getFormat(locale);
050    
051            return format.format(object);
052        }
053    
054        /**
055         * @see org.apache.tapestry.form.translator.AbstractTranslator#parseText(org.apache.tapestry.form.IFormComponent,
056         *      ValidationMessages, java.lang.String)
057         */
058        protected Object parseText(IFormComponent field, ValidationMessages messages, String text)
059                throws ValidatorException
060        {
061            Format format = getFormat(messages.getLocale());
062    
063            try
064            {
065                return format.parseObject(text);
066            }
067            catch (ParseException ex)
068            {
069                throw new ValidatorException(buildMessage(messages, field, getMessageKey()),
070                        getConstraint());
071            }
072        }
073    
074        protected abstract ValidationConstraint getConstraint();
075    
076        protected abstract Format getFormat(Locale locale);
077    
078        protected abstract String getMessageKey();
079    
080        public String getPattern()
081        {
082            return _pattern;
083        }
084    
085        public void setPattern(String pattern)
086        {
087            _pattern = pattern;
088        }
089    
090        public FormatTranslator()
091        {
092            _pattern = defaultPattern();
093        }
094    
095        // Needed until HIVEMIND-134 fix is available
096        public FormatTranslator(String initializer)
097        {
098            PropertyUtils.configureProperties(this, initializer);
099    
100            if (HiveMind.isBlank(_pattern))
101            {
102                _pattern = defaultPattern();
103            }
104        }
105    }