// Copyright 2007 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.tapestry.validator;
import static org.apache.tapestry.TapestryUtils.quote;
import org.apache.tapestry.Field;
import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.PageRenderSupport;
import org.apache.tapestry.ValidationException;
import org.apache.tapestry.Validator;
import org.apache.tapestry.ioc.MessageFormatter;
public final class MaxLength implements Validator<Integer, String>
{
public Class<Integer> getConstraintType()
{
return Integer.class;
}
public String getMessageKey()
{
return "maximum-string-length";
}
public Class<String> getValueType()
{
return String.class;
}
public boolean invokeIfBlank()
{
return false;
}
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, PageRenderSupport pageRenderSupport)
{
pageRenderSupport.addScript(
"Tapestry.Field.maxlength('%s', %d, %s);",
field.getClientId(),
constraintValue,
quote(buildMessage(formatter, field, constraintValue)));
}
}