    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005//     http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.validator;
    014
    015import org.apache.tapestry5.Field;
    016import org.apache.tapestry5.MarkupWriter;
    017import org.apache.tapestry5.ValidationException;
    018import org.apache.tapestry5.commons.MessageFormatter;
    019import org.apache.tapestry5.services.FormSupport;
    020import org.apache.tapestry5.services.javascript.DataConstants;
    021import org.apache.tapestry5.services.javascript.JavaScriptSupport;
    022
    023import java.util.regex.Matcher;
    024import java.util.regex.Pattern;
    025
    026/**
    027 * Enforces that the input matches a provided regular expression.
    028 *
    029 * Starting in 5.4, this always writes the pattern and title attribute, even when client validation is not enabled.
    030 * The title attribute is used specially by modern browsers, in concert with pattern.
    031 */
    032public class Regexp extends AbstractValidator<Pattern, String>
    033{
    034    public Regexp(JavaScriptSupport javaScriptSupport)
    035    {
    036        super(Pattern.class, String.class, "regexp", javaScriptSupport);
    037    }
    038
    039    private String buildMessage(MessageFormatter formatter, Field field, Pattern constraintValue)
    040    {
    041        return formatter.format(constraintValue.toString(), field.getLabel());
    042    }
    043
    044    public void render(Field field, Pattern constraintValue, MessageFormatter formatter, MarkupWriter writer,
    045                       FormSupport formSupport)
    046    {
    047        String message = buildMessage(formatter, field, constraintValue);
    048
    049        if (formSupport.isClientValidationEnabled())
    050        {
    051            javaScriptSupport.require("t5/core/validation");
    052
    053            writer.attributes(DataConstants.VALIDATION_ATTRIBUTE, true,
    054                    "data-validate-regexp", constraintValue.pattern(),
    055                    "data-regexp-message", message,
    056                    "pattern", constraintValue.pattern(),
    057                    "title", message);
    058        }
    059    }
    060
    061    public void validate(Field field, Pattern constraintValue, MessageFormatter formatter, String value)
    062            throws ValidationException
    063    {
    064        Matcher matcher = constraintValue.matcher(value);
    065
    066        if (!matcher.matches()) throw new ValidationException(buildMessage(formatter, field, constraintValue));
    067    }
    068
    069}