/*
 * JBoss, the OpenSource J2EE webOS
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */

import org.jboss.aop.joinpoint.Invocation;
import org.jboss.aop.joinpoint.MethodInvocation;
import org.jboss.aop.joinpoint.ConstructorInvocation;
import org.jboss.aop.joinpoint.FieldReadInvocation;
import org.jboss.aop.joinpoint.FieldWriteInvocation;
import org.jboss.aop.advice.Interceptor;

/**
 *
 * @author <a href="mailto:bill@jboss.org">Bill Burke</a>
 * @version $Revision: 1.3 $
 */
public class TraceInterceptor implements Interceptor
{
   public String getName() { return "TraceInterceptor"; }

   public Object invoke(Invocation invocation) throws Throwable
   {
      String msg = "";
      if (invocation instanceof MethodInvocation)
      {
         msg = "executing method " + ((MethodInvocation)invocation).getMethod().toString();
      }
      else if (invocation instanceof ConstructorInvocation)
      {
         msg = "executing constructor " + ((ConstructorInvocation)invocation).getConstructor();
      }
      else if (invocation instanceof FieldReadInvocation)
      {
         msg = "read field name: " + ((FieldReadInvocation)invocation).getField();
      }
      else if (invocation instanceof FieldWriteInvocation)
      {
         msg = "write field name: " + ((FieldWriteInvocation)invocation).getField();
      }
      else
      {
         msg = "unknown invocation type: " + invocation.getClass().getName();
      }

      try
      {
         System.out.println("<<< Trace : " + msg);
         return invocation.invokeNext();
      }
      finally
      {
         System.out.println(">>> Leaving Trace");
      }
   }
}