com.thoughtworks.proxy.toys.decorate
Class InvocationDecoratorSupport

java.lang.Object
  com.thoughtworks.proxy.toys.decorate.InvocationDecoratorSupport

All Implemented Interfaces:

InvocationDecorator, Serializable

Direct Known Subclasses:

EchoDecorator

public class InvocationDecoratorSupport
extends Object
implements InvocationDecorator

Identity implementation for a InvokerDecorator. The implementation will just pass through any values. Use this as base class for derived implementations, that do not override all of the methods.

Since:

0.1

Author:

Dan North

See Also:

Serialized Form

Constructor Summary

InvocationDecoratorSupport()

Method Summary

Object[]	beforeMethodStarts(Object proxy, Method method, Object[] args) Called before a method is invoked on an object, to possibly decorate the arguments being passed to the method invocation.
Exception	decorateInvocationException(Object proxy, Method method, Object[] args, Exception cause) Called when a method cannot be invoked, to possibly decorate the type of error.
Object	decorateResult(Object proxy, Method method, Object[] args, Object result) Called on the way back from a method invocation, to possibly decorate the result.
Throwable	decorateTargetException(Object proxy, Method method, Object[] args, Throwable cause) Called when a called method fails, to possibly decorate the type of error.

Methods inherited from class java.lang.Object

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

Constructor Detail

InvocationDecoratorSupport

public InvocationDecoratorSupport()

Method Detail

beforeMethodStarts

public Object[] beforeMethodStarts(Object proxy,
                                   Method method,
                                   Object[] args)

Description copied from interface: InvocationDecorator

Called before a method is invoked on an object, to possibly decorate the arguments being passed to the method invocation.

Specified by:

beforeMethodStarts in interface InvocationDecorator

Parameters:

proxy - the proxy the method will be invoked on

method - the method to be invoked

args - the arguments being passed to the method

Returns:

the decorated arguments (typically just the ones supplied)

decorateResult

public Object decorateResult(Object proxy,
                             Method method,
                             Object[] args,
                             Object result)

Description copied from interface: InvocationDecorator

Called on the way back from a method invocation, to possibly decorate the result.

Specified by:

decorateResult in interface InvocationDecorator

Parameters:

proxy - the proxy the method was be invoked on

method - the invoked method

args - the arguments passed to the method

result - the result of the method invocation

Returns:

the decorated result (typically just the supplied result)

decorateTargetException

public Throwable decorateTargetException(Object proxy,
                                         Method method,
                                         Object[] args,
                                         Throwable cause)

Description copied from interface: InvocationDecorator

Called when a called method fails, to possibly decorate the type of error.

Specified by:

decorateTargetException in interface InvocationDecorator

Parameters:

proxy - the proxy the method was be invoked on

method - the invoked method

args - the arguments passed to the method

cause - the original exception thrown

Returns:

the decorated exception (typically just the supplied cause)

decorateInvocationException

public Exception decorateInvocationException(Object proxy,
                                             Method method,
                                             Object[] args,
                                             Exception cause)

Description copied from interface: InvocationDecorator

Called when a method cannot be invoked, to possibly decorate the type of error.

Specified by:

decorateInvocationException in interface InvocationDecorator

Parameters:

proxy - the proxy the method was be invoked on

method - the invoked method

args - the arguments passed to the method

cause - the original exception thrown

Returns:

the decorated exception (typically just the supplied cause)