// Copyright 2005 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.enhance;
import java.util.Iterator;
import org.apache.hivemind.ErrorLog;
import org.apache.hivemind.service.ClassFabUtils;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.spec.IComponentSpecification;
import org.apache.tapestry.spec.IContainedComponent;
/**
* Injects components for which the property attribute of the <component> element was
* specified. This makes it easier to reference a particular component from Java code.
*
* @author Howard M. Lewis Ship
* @since 4.0
*/
public class InjectComponentWorker implements EnhancementWorker
{
private ErrorLog _errorLog;
public void performEnhancement(EnhancementOperation op, IComponentSpecification spec)
{
Iterator i = spec.getComponentIds().iterator();
while (i.hasNext())
{
String id = (String) i.next();
IContainedComponent cc = spec.getComponent(id);
String propertyName = cc.getPropertyName();
if (propertyName != null)
{
try
{
injectComponent(op, id, propertyName);
}
catch (Exception ex)
{
_errorLog.error(EnhanceMessages.errorAddingProperty(propertyName, op
.getBaseClass(), ex), cc.getLocation(), ex);
}
}
}
}
private void injectComponent(EnhancementOperation op, String componentId, String propertyName)
{
Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName, null);
op.claimProperty(propertyName);
String fieldName = "_$" + propertyName;
op.addField(fieldName, propertyType);
EnhanceUtils.createSimpleAccessor(op, fieldName, propertyName, propertyType);
// I.e. _$fred = (IComponent) getComponent("fred");
String code = fieldName + " = (" + ClassFabUtils.getJavaClassName(propertyType)
+ ") getComponent(\"" + componentId + "\");";
op.extendMethodImplementation(IComponent.class, EnhanceUtils.FINISH_LOAD_SIGNATURE, code);
}
public void setErrorLog(ErrorLog errorLog)
{
_errorLog = errorLog;
}
}