Clarifications About Project

Subject: Clarifications About Project
From: John Sung (
Date: Tue Mar 05 2002 - 14:27:16 EST

There have been some frequently asked questions. Just
to reiterate it so that everyone knows:

o If you get an error about some JoinPoint then you
need to add some paths for classpath for aspectj.

Mainly you need to add this:


o The command line arguments the args is an array of
string and you can access the length, args.length to
see how long the length is.

o You need to differentiate between the traversals
that you use and the traversals that are defined in
the .trv file. The .trv file is parsed and you get a
parse tree. Then you need to make traversals and
visitors to traverse that parse tree to do your work.
Your work just happens to be processing traversal
specification to output an implementation of

o Here's a quick example of how to use implicit
visitor traversal methods.

ObjectName {

String processObject(int me)
  bypassing {badPlace} to goodPlace {
  {{ String returnVal = "Initialize Return val for the
visitor here"; }}

   before things {{

o For examples of this usage take a look at
~jser/demeter/edgelink. It implements a depth first
search algorithm for linking edges within an image.
You can also take a look at the source code for the
lab guide to understand how to create visitors and
traversal methods.

You should also use the DemeterJ User Manual for


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