// 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.lang.reflect.Modifier;
import java.util.Iterator;
import org.apache.hivemind.ErrorLog;
import org.apache.hivemind.Location;
import org.apache.hivemind.service.ClassFabUtils;
import org.apache.hivemind.service.MethodSignature;
import org.apache.hivemind.util.Defense;
import org.apache.tapestry.spec.IBeanSpecification;
import org.apache.tapestry.spec.IComponentSpecification;
/**
* Injects a property that will dynamically access a managed bean.
*
* @author Howard M. Lewis Ship
* @since 4.0
*/
public class InjectBeanWorker implements EnhancementWorker
{
private ErrorLog _errorLog;
public void performEnhancement(EnhancementOperation op,
IComponentSpecification spec)
{
Iterator i = spec.getBeanNames().iterator();
while(i.hasNext())
{
String name = (String) i.next();
IBeanSpecification bs = spec.getBeanSpecification(name);
String propertyName = bs.getPropertyName();
if (propertyName != null)
{
try
{
injectBean(op, name, propertyName, bs.getLocation());
}
catch (Exception ex)
{
_errorLog.error(EnhanceMessages.errorAddingProperty(
propertyName, op.getBaseClass(), ex), bs
.getLocation(), ex);
}
}
}
}
public void injectBean(EnhancementOperation op, String beanName,
String propertyName, Location location)
{
Defense.notNull(op, "op");
Defense.notNull(beanName, "beanName");
Defense.notNull(propertyName, "propertyName");
op.claimReadonlyProperty(propertyName);
Class propertyType = EnhanceUtils.extractPropertyType(op, propertyName,
null);
String methodName = op.getAccessorMethodName(propertyName);
MethodSignature sig = new MethodSignature(propertyType, methodName,
null, null);
// i.e.
// return (foo.bar.Baz) getBeans().getBean("baz");
op.addMethod(Modifier.PUBLIC, sig, "return ("
+ ClassFabUtils.getJavaClassName(propertyType)
+ ") getBeans().getBean(\"" + beanName + "\");", location);
}
public void setErrorLog(ErrorLog errorLog)
{
_errorLog = errorLog;
}
}