package org.apache.ojb.broker.util.interceptor;

 /* Copyright 2002-2005 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.

  */

 import java.lang.reflect.Method;

 //#ifdef JDK13

 import java.lang.reflect.InvocationHandler;

 //#else

 /*

 import com.develop.java.lang.reflect.InvocationHandler; 

 */

 //#endif

 /**

  * @author Thomas Mahler

  */

 public abstract class Interceptor implements InvocationHandler

 {

         private Object realSubject = null;

         /**

          * @see com.develop.java.lang.reflect.InvocationHandler#invoke(Object, Method, Object[])

          */

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

         {

                 beforeInvoke(proxy, methodToBeInvoked, args);

                 Object result = null;

                 result = doInvoke(proxy, methodToBeInvoked, args);

                 afterInvoke(proxy, methodToBeInvoked, args);

                 return result;

         }

         /**

          * this method will be invoked before methodToBeInvoked is invoked

          */

         protected abstract void beforeInvoke(Object proxy, Method methodToBeInvoked, Object[] args)

                 throws Throwable;

         /**

          * this method will be invoked after methodToBeInvoked is invoked

          */

         protected abstract void afterInvoke(Object proxy, Method methodToBeInvoked, Object[] args)

                 throws Throwable;

         /**

          * this method will be invoked after methodToBeInvoked is invoked

          */

         protected Object doInvoke(Object proxy, Method methodToBeInvoked, Object[] args)

                 throws Throwable

         {

                 Method m =

                         getRealSubject().getClass().getMethod(

                                 methodToBeInvoked.getName(),

                                 methodToBeInvoked.getParameterTypes());

                 return m.invoke(getRealSubject(), args);

         }

         /**

          * Returns the realSubject.

          * @return Object

          */

         public Object getRealSubject()

         {

                 return realSubject;

         }

         /**

          * Sets the realSubject.

          * @param realSubject The realSubject to set

          */

         public void setRealSubject(Object realSubject)

         {

                 this.realSubject = realSubject;

         }

 }