classUtils.javassist.sample.reflect
Class VerboseMetaobj

java.lang.Object
  classUtils.javassist.reflect.Metaobject
      classUtils.javassist.sample.reflect.VerboseMetaobj

All Implemented Interfaces:

java.io.Serializable

public class VerboseMetaobj
extends Metaobject

See Also:

Serialized Form

Constructor Summary

VerboseMetaobj(java.lang.Object self, java.lang.Object[] args)

Method Summary

java.lang.Object	trapFieldRead(java.lang.String name) Is invoked when public fields of the base-level class are read and the runtime system intercepts it.
void	trapFieldWrite(java.lang.String name, java.lang.Object value) Is invoked when public fields of the base-level class are modified and the runtime system intercepts it.
java.lang.Object	trapMethodcall(int identifier, java.lang.Object[] args) Is invoked when base-level method invocation is intercepted.

Methods inherited from class classUtils.javassist.reflect.Metaobject

getClassMetaobject, getMethodName, getObject, getParameterTypes, getReturnType, setObject

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VerboseMetaobj

public VerboseMetaobj(java.lang.Object self,
                      java.lang.Object[] args)

Method Detail

trapFieldRead

public java.lang.Object trapFieldRead(java.lang.String name)

Description copied from class: Metaobject

Is invoked when public fields of the base-level class are read and the runtime system intercepts it. This method simply returns the value of the field.

Every subclass of this class should redefine this method.

Overrides:

trapFieldRead in class Metaobject

trapFieldWrite

public void trapFieldWrite(java.lang.String name,
                           java.lang.Object value)

Description copied from class: Metaobject

Is invoked when public fields of the base-level class are modified and the runtime system intercepts it. This method simply sets the field to the given value.

Every subclass of this class should redefine this method.

Overrides:

trapFieldWrite in class Metaobject

trapMethodcall

public java.lang.Object trapMethodcall(int identifier,
                                       java.lang.Object[] args)
                                throws java.lang.Throwable

Description copied from class: Metaobject

Is invoked when base-level method invocation is intercepted. This method simply executes the intercepted method invocation with the original parameters and returns the resulting value.

Every subclass of this class should redefine this method.

Note: this method is not invoked if the base-level method is invoked by a constructor in the super class. For example,

abstract class A {
   abstract void initialize();
   A() {
       initialize();    // not intercepted
   }
 }

 class B extends A {
   void initialize() { System.out.println("initialize()"); }
   B() {
       super();
       initialize();    // intercepted
   }
 }

if an instance of B is created, the invocation of initialize() in B is intercepted only once. The first invocation by the constructor in A is not intercepted. This is because the link between a base-level object and a metaobject is not created until the execution of a constructor of the super class finishes.

Overrides:

trapMethodcall in class Metaobject

Throws:

java.lang.Throwable