private static IActivity consumeXor(
IActivity startActivity,
LinkedList<ITransition> unconsumed,
HashSet<ITransition> visited,
boolean forward,
boolean supportsLoops,
ModelElementList<ITransition> transitions) {
IActivity result = null;
for (ITransition out : transitions) {
if (visited.contains(out)) // loop
{
if (!supportsLoops) {
return null;
}
} else {
LinkedList<ITransition> unconsumedClone = (LinkedList<ITransition>) unconsumed.clone();
HashSet<ITransition> visitedClone = (HashSet<ITransition>) visited.clone();
visitedClone.add(out);
unconsumedClone.add(out);
IActivity next =
consume(startActivity, unconsumedClone, visitedClone, forward, supportsLoops);
if (next == null) {
return null;
} else if (result == null) {
result = next;
} else if (result != next) {
return null;
}
}
}
return result;
}
