001    // Copyright 2007, 2008 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.tapestry5.validator;
016    
017    import org.apache.tapestry5.Field;
018    import org.apache.tapestry5.MarkupWriter;
019    import org.apache.tapestry5.ValidationException;
020    import org.apache.tapestry5.ioc.MessageFormatter;
021    import org.apache.tapestry5.services.FormSupport;
022    
023    import java.util.regex.Matcher;
024    import java.util.regex.Pattern;
025    
026    public class Regexp extends AbstractValidator<Pattern, String>
027    {
028        public Regexp()
029        {
030            super(Pattern.class, String.class, "regexp");
031        }
032    
033        private String buildMessage(MessageFormatter formatter, Field field, Pattern constraintValue)
034        {
035            return formatter.format(constraintValue.toString(), field.getLabel());
036        }
037    
038        public void render(Field field, Pattern constraintValue, MessageFormatter formatter, MarkupWriter writer,
039                           FormSupport formSupport)
040        {
041            formSupport.addValidation(field, "regexp", buildMessage(formatter, field, constraintValue),
042                                      constraintValue.pattern());
043        }
044    
045        public void validate(Field field, Pattern constraintValue, MessageFormatter formatter, String value)
046                throws ValidationException
047        {
048            Matcher matcher = constraintValue.matcher(value);
049    
050            if (!matcher.matches()) throw new ValidationException(buildMessage(formatter, field, constraintValue));
051        }
052    
053    }