Description Alex Lagarde 2010-07-12 08:11:21 EDT

When I have created my MatchModel using a ScopeProvider : 

Map<String, Object> optionsMap = new HashMap<String, Object>();
optionsMap.put(MatchOptions.OPTION_MATCH_SCOPE_PROVIDER, new MyScopeProvider());

match = new MyMatchEngine().contentMatch(leftRoot,
				rightRoot, optionsMap);

the following call : 

DiffModel diff = DiffService.doDiff(match,false);
raises the following exception : 

java.lang.NullPointerException
	at org.eclipse.emf.compare.diff.engine.check.AbstractCheck.isUnmatched(AbstractCheck.java:155)
	at org.eclipse.emf.compare.diff.engine.check.ReferencesCheck.checkContainmentReferenceOrderChange(ReferencesCheck.java:147)
	at org.eclipse.emf.compare.diff.engine.check.ReferencesCheck.checkReferencesUpdates(ReferencesCheck.java:79)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.checkForDiffs(GenericDiffEngine.java:330)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.doDiffDelegate(GenericDiffEngine.java:884)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.doDiffDelegate(GenericDiffEngine.java:907)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.doDiffDelegate(GenericDiffEngine.java:907)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.doDiffDelegate(GenericDiffEngine.java:907)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.doDiffTwoWay(GenericDiffEngine.java:566)
	at org.eclipse.emf.compare.diff.engine.GenericDiffEngine.doDiff(GenericDiffEngine.java:105)
	at org.eclipse.emf.compare.diff.service.DiffService.doDiff(DiffService.java:102)


To correct this bug, the only thing to do seems to deal with the "crossReferencer.get(element) == null" situation (and return true in this case, as the object can be seen as unmatched).