[SUBMIT]simple utility to genarate proxy

This code is forked from some persistence framework in jakarta-commons,
It can be more meanngful to have it in BCEL project. It can be useful for
persistence like EJB CMP, Didtributed object proxy, Tracing, Validating,
Bean generating.........
The same idea as java.reflect.Proxy, but can extend existing class.

Usage :


  // TODO: Paste it to some test

     public void testEnhance()throws Throwable{

       // IMPLEMENT INTERCEPTOR
        MethodInterceptor interceptor =
         new MethodInterceptor(){

            public Object beforeInvoke( Object obj,java.lang.reflect.Method
method,
            Object args[] )
            throws java.lang.Throwable{
                System.out.println( "about to invoke "  + method);
                return null;
            }

            public boolean invokeSuper( Object obj,java.lang.reflect.Method
method,
            Object args[], Object retValFromBefore )
            throws java.lang.Throwable{
                return true;
            }


        public Object afterReturn(  Object obj,     java.lang.reflect.Method
method,
        Object args[],  Object retValFromBefore,
        boolean invokedSuper, Object retValFromSuper,
        java.lang.Throwable e )throws java.lang.Throwable{

            System.out.println( "returned "  + retValFromSuper);

            return retValFromSuper;//return the same as supper
        }

    };

    //EXTEND VECTOR

      java.util.Vector vector =
         (java.util.Vector)Enhancer.enhance(
         java.util.Vector.class,
         new Class[]{java.util.List.class}, // implement some interfaces
         interceptor,
         java.util.Vector.class.getClassLoader()
        );


 //Call some methods :

    String value = "VALUE";
    vector.add(null);

    vector.elements();
    vector.size();
    vector.add(value);
    vector.remove(value);
    vector.remove(value);
    vector.contains(value);
    vector.get(0);
    vector.contains(value);
    vector.toArray(new Object[]{});

}

Output :


 about to invoke public synchronized boolean
java.util.Vector.add(java.lang.Object)
returned true
about to invoke public java.util.Enumeration java.util.Vector.elements()
returned java.util.Vector$1@2a3722
about to invoke public synchronized int java.util.Vector.size()
returned 1
about to invoke public synchronized boolean
java.util.Vector.add(java.lang.Object)
returned true
about to invoke public boolean java.util.Vector.remove(java.lang.Object)
about to invoke public synchronized boolean
java.util.Vector.removeElement(java.lang.Object)
about to invoke public int java.util.Vector.indexOf(java.lang.Object)
about to invoke public synchronized int
java.util.Vector.indexOf(java.lang.Object,int)
returned 1
returned 1
about to invoke public synchronized void
java.util.Vector.removeElementAt(int)
returned null
returned true
returned true
about to invoke public boolean java.util.Vector.remove(java.lang.Object)
about to invoke public synchronized boolean
java.util.Vector.removeElement(java.lang.Object)
about to invoke public int java.util.Vector.indexOf(java.lang.Object)
about to invoke public synchronized int
java.util.Vector.indexOf(java.lang.Object,int)
returned -1
returned -1
returned false
returned false
about to invoke public boolean java.util.Vector.contains(java.lang.Object)
about to invoke public synchronized int
java.util.Vector.indexOf(java.lang.Object,int)
returned -1
returned false
about to invoke public synchronized java.lang.Object
java.util.Vector.get(int)
returned null
about to invoke public boolean java.util.Vector.contains(java.lang.Object)
about to invoke public synchronized int
java.util.Vector.indexOf(java.lang.Object,int)
returned -1
returned false
about to invoke public synchronized java.lang.Object[]
java.util.Vector.toArray(java.lang.Object[])
returned [Ljava.lang.Object;@c88440

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