[aspectj-users] re: Possible?

["Anagnost, Ted (MED, GEMS-IT)" <Theodore.Anagnost@xxxxxxxxxx>]

Sorry if this is a repeat of my previous post:


> Given this situation:
> 
> public class A
> {
> 	private B m_b;
> 	
> 	public void method()
> 	{
> 		m_b = new B( "Test" );
> 		m_b.method();
> 	}
> }
> 
> public class B extends D
> {
> 	public B(String string)
> 	{
> 	}
> 
> 	public void method()
> 	{
> 	}
> }
> 
> public class C extends D
> {
> 	public C(String string)
> 	{
> 	}
> 
> 	public void method()
> 	{
> 	}
> }
> 
> Is it possible to change A so that when it tries to do this:
> 
> 		m_b = new B( "Test" );
> 		m_b.method();		
> 		
> it actually effectively does this:
> 
> 		m_b = new C( "Test" );
> 		m_b.method(); // calls C's method()		
> 	
> In other words can I used AspectJ to substitute another class C
> for class B (as long as it has the same inheritance model and public 
> interface) without changing the original source code?
> 
> 
> If the above is impossible, a related question is:
> 
> Can I create an aspect such that if there is a call to a method, that
> method call 
> is redirected to another object (that has a method of the same
> signature) instead?
> 
> And then when that other object's method call is finished, the
> original object's 
> method's code is bypassed altogether?
> 
> Thanks,
> 
> Ted