    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
    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.Pattern;
    024
    025    /**
    026     * A validator that checks if a given string is well-formed email address. This validator is not configurable.
    027     */
    028    public 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    }