001// Copyright 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.Pattern;
024
025/**
026 * A validator that checks if a given string is well-formed email address. This validator is not configurable.
027 */
028public class Email extends AbstractValidator<Void, String>
029{
030    private static final String ATOM = "[^\\x00-\\x1F^\\(^\\)^\\<^\\>^\\@^\\,^\\;^\\:^\\\\^\\\"^\\.^\\[^\\]^\\s]";
031
032    private static final String DOMAIN = "(" + ATOM + "+(\\." + ATOM + "+)*";
033
034    private static final String IP_DOMAIN = "\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\]";
035
036    private static final Pattern PATTERN = Pattern
037            .compile("^" + ATOM + "+(\\." + ATOM + "+)*@" + DOMAIN + "|" + IP_DOMAIN + ")$", Pattern.CASE_INSENSITIVE);
038
039    public Email()
040    {
041        super(null, String.class, "invalid-email");
042    }
043
044    public void render(Field field, Void constraintValue, MessageFormatter formatter, MarkupWriter markupWriter,
045                       FormSupport formSupport)
046    {
047    }
048
049    private String buildMessage(MessageFormatter formatter, Field field)
050    {
051        return formatter.format(field.getLabel());
052    }
053
054    public void validate(Field field, Void constraintValue, MessageFormatter formatter, String value)
055            throws ValidationException
056    {
057        if (!PATTERN.matcher(value).matches()) throw new ValidationException(buildMessage(formatter, field));
058    }
059}