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
015package org.apache.tapestry5.validator;
016
017import org.apache.tapestry5.Field;
018import org.apache.tapestry5.MarkupWriter;
019import org.apache.tapestry5.ValidationException;
020import org.apache.tapestry5.ioc.MessageFormatter;
021import org.apache.tapestry5.services.FormSupport;
022
023import java.util.regex.Matcher;
024import java.util.regex.Pattern;
025
026public 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}