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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package com.sun.ejb.containers;

import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.lang.reflect.Method;

import javax.ejb.EJBException;

import com.sun.ejb.containers.util.InvocationHandlerUtil;

/** 
 * This is an invocation handler for a remote EJB 3.x business
 * interface.  It is used to convert invocations made on the
 * EJB 3.0 business interface to its corresponding RMI-IIOP 
 * object.
 *
 * @@@ Need to handle serialization/deserialization
 *
 * @author Kenneth Saks
 */    

public final class RemoteBusinessIntfInvocationHandler  
    implements InvocationHandler, Serializable {

    private Class businessInterface;
    private java.rmi.Remote delegate;

    public RemoteBusinessIntfInvocationHandler(Class businessIntf,
                                               java.rmi.Remote stub) {
        businessInterface = businessIntf;
        delegate = stub;
    }

    public Object invoke(Object proxy, Method method, Object[] args) 
        throws Throwable {

        // NOTE : be careful with "args" parameter.  It is null
        //        if method signature has 0 arguments.

        Class methodClass = method.getDeclaringClass();
        if( methodClass == java.lang.Object.class )  {
            return InvocationHandlerUtil.
                invokeJavaObjectMethod(this, method, args);    
        }

        Object returnValue = null;
        Throwable t = null;
        try {
            Method m = delegate.getClass().getMethod
                (method.getName(), method.getParameterTypes());
                                                     
            returnValue = m.invoke(delegate, args);
        } catch(NoSuchMethodException nsme) {
            t = nsme;
        } catch(InvocationTargetException ite) {
            t = ite.getCause();
        } catch(Throwable c) {
            t = c;
        }

        if( t != null ) {
            if( t instanceof java.rmi.RemoteException ) {
                EJBException ejbEx = new EJBException();
                ejbEx.initCause(t);
                throw ejbEx;
            } else {
                throw t;
            }
        }

        return returnValue;
    }
    
}