001// Copyright 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.Pattern;
026
027/**
028 * A validator that checks if a given string is well-formed email address. This validator is not configurable.
029 * <p/>
030 * Starting with release 5.4, this validator also performs client-side validation.
031 */
032public class Email extends AbstractValidator<Void, String>
033{
034    private static final Pattern PATTERN = Pattern
035            .compile("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", Pattern.CASE_INSENSITIVE);
036
037    public Email(JavaScriptSupport javaScriptSupport)
038    {
039        super(null, String.class, "invalid-email", javaScriptSupport);
040    }
041
042    public void render(Field field, Void constraintValue, MessageFormatter formatter, MarkupWriter writer,
043                       FormSupport formSupport)
044    {
045        if (formSupport.isClientValidationEnabled())
046        {
047            javaScriptSupport.require("t5/core/validation");
048
049            writer.attributes(
050                    DataConstants.VALIDATION_ATTRIBUTE, true,
051                    "data-validate-regexp", PATTERN.pattern(),
052                    "data-regexp-message", formatter.toString());
053        }
054    }
055
056    public void validate(Field field, Void constraintValue, MessageFormatter formatter, String value)
057            throws ValidationException
058    {
059        if (!PATTERN.matcher(value).matches()) throw new ValidationException(formatter.toString());
060    }
061}