/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aop.microcontainer.aspects;
import java.lang.annotation.Annotation;
import org.jboss.aop.advice.Interceptor;
import org.jboss.aop.joinpoint.Invocation;
import org.jboss.aop.joinpoint.MethodInvocation;
import org.jboss.kernel.spi.dependency.KernelControllerContext;
/**
* Abstract helper class for [Aspect]Introduction.
*
* @param <T> the annotation type
* @author <a href="mailto:ales.justin@jboss.com">Ales Justin</a>
*/
public abstract class AbstractIntroduction<T extends Annotation> implements Interceptor
{
public String getName()
{
return getClass().getName();
}
protected abstract Class<T> getBindingAnnotation();
protected boolean isBindingInfoPresent(Invocation invocation)
{
return invocation.resolveClassAnnotation(getBindingAnnotation()) != null;
}
protected T resolveBindingInfo(Invocation invocation)
{
Class<T> bindingClass = getBindingAnnotation();
Object bindingInfo = invocation.resolveClassAnnotation(bindingClass);
return bindingClass.cast(bindingInfo);
}
protected void onRegistration(Invocation invocation, KernelControllerContext context)
{
onRegistration(context, resolveBindingInfo(invocation));
}
protected void onRegistration(KernelControllerContext context, T annotation)
{
}
protected void onUnregistration(Invocation invocation, KernelControllerContext context)
{
onUnregistration(context, resolveBindingInfo(invocation));
}
protected void onUnregistration(KernelControllerContext context, T annotation)
{
}
public Object invoke(Invocation invocation) throws Throwable
{
MethodInvocation mi = (MethodInvocation) invocation;
KernelControllerContext context = (KernelControllerContext) mi.getArguments()[0];
String methodName = mi.getMethod().getName();
boolean infoPresent = isBindingInfoPresent(invocation);
if ("setKernelControllerContext".equals(methodName) && infoPresent)
{
onRegistration(invocation, context);
}
else if (infoPresent)
{
onUnregistration(invocation, context);
}
return null;
}
}