// Copyright 2007, 2008 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.validator;

 import org.apache.tapestry5.Field;

 import org.apache.tapestry5.MarkupWriter;

 import org.apache.tapestry5.ValidationException;

 import org.apache.tapestry5.ioc.MessageFormatter;

 import org.apache.tapestry5.services.FormSupport;

 public final class MaxLength extends AbstractValidator<Integer, String>

 {

     public MaxLength()

     {

         super(Integer.class, String.class, "maximum-string-length");

     }

     public void validate(Field field, Integer constraintValue, MessageFormatter formatter, String value)

             throws ValidationException

     {

         if (value.length() > constraintValue)

             throw new ValidationException(buildMessage(formatter, field, constraintValue));

     }

     private String buildMessage(MessageFormatter formatter, Field field, Integer constraintValue)

     {

         return formatter.format(constraintValue, field.getLabel());

     }

     public void render(Field field, Integer constraintValue, MessageFormatter formatter, MarkupWriter writer,

                        FormSupport formSupport)

     {

         // TODO: write a maxlength attribute into the element?  But that's only for

         // textfield, not for textarea.

         formSupport.addValidation(field, "maxlength", buildMessage(formatter, field, constraintValue), constraintValue);

     }

 }