001// Copyright 2007, 2008, 2012 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;
022import org.apache.tapestry5.services.javascript.DataConstants;
023import org.apache.tapestry5.services.javascript.JavaScriptSupport;
024
025import java.util.regex.Matcher;
026import java.util.regex.Pattern;
027
028/**
029 * Enforces that the input matches a provided regular expression.
030 */
031public class Regexp extends AbstractValidator<Pattern, String>
032{
033    public Regexp(JavaScriptSupport javaScriptSupport)
034    {
035        super(Pattern.class, String.class, "regexp", javaScriptSupport);
036    }
037
038    private String buildMessage(MessageFormatter formatter, Field field, Pattern constraintValue)
039    {
040        return formatter.format(constraintValue.toString(), field.getLabel());
041    }
042
043    public void render(Field field, Pattern constraintValue, MessageFormatter formatter, MarkupWriter writer,
044                       FormSupport formSupport)
045    {
046        if (formSupport.isClientValidationEnabled())
047        {
048            javaScriptSupport.require("t5/core/validation");
049
050            writer.attributes(DataConstants.VALIDATION_ATTRIBUTE, true,
051                    "data-validate-regexp", constraintValue.pattern(),
052                    "data-regexp-message", buildMessage(formatter, field, constraintValue));
053        }
054    }
055
056    public void validate(Field field, Pattern constraintValue, MessageFormatter formatter, String value)
057            throws ValidationException
058    {
059        Matcher matcher = constraintValue.matcher(value);
060
061        if (!matcher.matches()) throw new ValidationException(buildMessage(formatter, field, constraintValue));
062    }
063
064}