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package com.sun.enterprise.deployment.annotation.handlers;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;

import javax.interceptor.AroundInvoke;

import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.EjbInterceptor;
import com.sun.enterprise.deployment.LifecycleCallbackDescriptor;

import com.sun.enterprise.deployment.annotation.AnnotationInfo;
import com.sun.enterprise.deployment.annotation.AnnotationProcessorException;
import com.sun.enterprise.deployment.annotation.HandlerProcessingResult;
import com.sun.enterprise.deployment.annotation.context.EjbContext;
import com.sun.enterprise.deployment.annotation.context.EjbInterceptorContext;

/**
 * This handler is responsible for handling the javax.ejb.AroundInvoke attribute
 *
 */
public class AroundInvokeHandler extends AbstractAttributeHandler {
    
    public AroundInvokeHandler() {
    }
    
    /**
     * @return the annoation type this annotation handler is handling
     */
    public Class<? extends Annotation> getAnnotationType() {
        return AroundInvoke.class;
    }    
        
    protected HandlerProcessingResult processAnnotation(AnnotationInfo ainfo,
            EjbContext[] ejbContexts) throws AnnotationProcessorException {

        for(EjbContext next : ejbContexts) {
            
            EjbDescriptor ejbDescriptor = 
                (EjbDescriptor) next.getDescriptor();

            ejbDescriptor.addAroundInvokeDescriptor(
                getAroundInvokeDescriptor(ainfo));
        }

        return getDefaultProcessedResult();
    }

    protected HandlerProcessingResult processAnnotation(AnnotationInfo ainfo,
            EjbInterceptorContext ejbInterceptorContext)
            throws AnnotationProcessorException {

        EjbInterceptor ejbInterceptor =  ejbInterceptorContext.getDescriptor();

        ejbInterceptor.addAroundInvokeDescriptor(
            getAroundInvokeDescriptor(ainfo));
            
        return getDefaultProcessedResult();
    }

    private LifecycleCallbackDescriptor getAroundInvokeDescriptor(
            AnnotationInfo ainfo) {
        
        Method m = (Method) ainfo.getAnnotatedElement();
        LifecycleCallbackDescriptor lccDesc =
                new LifecycleCallbackDescriptor();
        lccDesc.setLifecycleCallbackClass(m.getDeclaringClass().getName());
        lccDesc.setLifecycleCallbackMethod(m.getName());
        return lccDesc;
    }

    /**
     * @return an array of annotation types this annotation handler would 
     * require to be processed (if present) before it processes it's own 
     * annotation type.
     */
    public Class<? extends Annotation>[] getTypeDependencies() {
        return getEjbAnnotationTypes();
    }

    protected boolean isDelegatee() {
        return true;
    }
}