[prev in list] [next in list] [prev in thread] [next in thread] 

List:       bcel-user
Subject:    Re: Know the runtime class
From:       Andrew Huntwork <ash () huntwork ! net>
Date:       2004-08-02 15:35:03
Message-ID: 410E5F27.1050809 () huntwork ! net
[Download RAW message or body]

yes, but not really efficiently.  You just have to use a graph search 
algorithm like dfs or bfs to walk through the superclases and interfaces 
of each class in the classpath.  You can get the interface and 
superclass names using ClassGen.getInterfaceNames and 
ClassGen.getSuperclassName.

btw, if you happen to work for misys in tucson, feel free to drop by the 
Java Users Group next week (tucson-jug.org).  I and probably one other 
person who will be there will be glad to chat about bytecode editing.

Chakravarthy, Srikanth wrote:
> Thanks for the reply.
> Actually my problem will be solved even if I get the set S as you have
> mentioned. But how do I get the set S?
> 
> Is it possible to know the implementors of a given interface using
> JavaClass? Or should I use a different API? Then using this list I can
> check if the object of A is an instance of B.
> 
> Thanks,
> Srikanth
> 
> -----Original Message-----
> From: Andrew Huntwork [mailto:ash@huntwork.net] 
> Sent: 02 August 2004 15:40
> To: BCEL Users List
> Subject: Re: Know the runtime class
> 
> I'm pretty sure that you're describing the pointer aliasing problem, 
> which is in general undecidable.  There are a lot of heuristic and 
> approximation algorithms that compiler folks use, like Type-Based alias 
> analysis, which I think comes in 2 flavors, flow sensitive and 
> flow-insensitive.
> 
> basically, don't expect to discover that the concrete type of the field 
> of type A in C is B.  Expect to discover that the concrete type of A is 
> in a set S which happens to contain B.
> 
> hopefully, i'm misinterpreting your question and you're really asking 
> about something that's solvable.  good luck :)
> 
> Chakravarthy, Srikanth wrote:
> 
>>Hi,
>>I am creating a cross reference of classes.
>>If the classes have direct relations then I get all the related
> 
> classes.
> 
>>If there is an object of an interface that will be assigned the value
> 
> of
> 
>>the implementing class then I am not able to get that class as one of
>>the references.
>>
>>For example: class B implements Interface A.
>>In another class C, I have an object of A. Using reflection, I have
>>created the object of B and assigned to object of A. 
>>
>>Now, when I run my program to check the cross references for class C,
> 
> I
> 
>>do not get class B in the list as it is not directly involved with
> 
> class
> 
>>C.
>>
>>Is there any way to know the instance of the object of A in the class
> 
> C?
> 
>>Which API method should I use for this?
>>
>>Any help is deeply appreciated.
>>
>>Thanks
>>Srikanth
>>
>>---------------------------------------------------------------------
>>To unsubscribe, e-mail: bcel-user-unsubscribe@jakarta.apache.org
>>For additional commands, e-mail: bcel-user-help@jakarta.apache.org
>>
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: bcel-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: bcel-user-help@jakarta.apache.org
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: bcel-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: bcel-user-help@jakarta.apache.org
> 

---------------------------------------------------------------------
To unsubscribe, e-mail: bcel-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: bcel-user-help@jakarta.apache.org

[prev in list] [next in list] [prev in thread] [next in thread]