// 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.internal;
import org.apache.tapestry.BaseValidationDecorator;
import org.apache.tapestry.Field;
import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.ValidationTracker;
import org.apache.tapestry.dom.Element;
import org.apache.tapestry.services.Environment;
/**
* Default implementation that writes an attribute into fields or labels that are in error.
*/
public final class DefaultValidationDecorator extends BaseValidationDecorator
{
private final Environment _environment;
public DefaultValidationDecorator(final Environment environment)
{
_environment = environment;
}
@Override
public void insideField(Field field)
{
if (inError(field))
addErrorClassToCurrentElement();
}
@Override
public void insideLabel(Field field, Element element)
{
if (field == null)
return;
if (inError(field))
addErrorClass(element);
}
private boolean inError(Field field)
{
ValidationTracker tracker = _environment.peekRequired(ValidationTracker.class);
return tracker.inError(field);
}
private void addErrorClassToCurrentElement()
{
MarkupWriter writer = _environment.peekRequired(MarkupWriter.class);
Element element = writer.getElement();
addErrorClass(element);
}
private void addErrorClass(Element element)
{
String current = element.getAttribute("class");
String newValue = current == null ? InternalConstants.TAPESTRY_ERROR_CLASS : current + " "
+ InternalConstants.TAPESTRY_ERROR_CLASS;
element.forceAttributes("class", newValue);
}
}