[henshin-dev] Problem with "destructive operations" on rule-nodes

[Jens Bürger <jens.buerger@xxxxxxxxxxxxxxxxx>]

Hello all,

I have a problem whilst doing matches with Henshin API.

As Christian suggested some time ago, I set the types of nodes in rules via

getType() and setType() methods.

This happens via some instances of the class "ClicheInstance" which owns 
the method getAllMatches (see attached source).
Now I found out that the modifications I apply to the transformation 
model seem to be applied down to the resource, so that I get funny 
effects when using different modifications to rules and transformations 
on one transformation model at a time.

I had a look at the Henshin sources and got the following question:

Am I right that if I want do to several type modifications at a time, my 
only chance is to create seperate HenshinResourceSets for each of the 
ClicheInstance-instances?

Jens

	public Iterable<Match> getAllMatches() {
		Module module = model.getTransformationModule();
		EGraph modelGraph = model.getModelGraph();
		Rule rule = (Rule) module.getUnit(cliche);
		EngineImpl transformationEngine = new EngineImpl();

		for (Assignment a : nodeAssignmentList) {
			EClass cls = ((Rule) module.getUnit("lib." + a.getValue()))
					.getLhs().getNode("libNode").getType();
			rule.getLhs().getNode(a.getName()).setType(cls);
			rule.getRhs().getNode(a.getName()).setType(cls);
		}

		return transformationEngine.findMatches(rule, modelGraph, null);
	}