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Re: [mdt-ocl.dev] OCL recursive operation
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Steffen,
it seems you may be able to solve the problem elegantly using ->closure which is supported by MDT/OCL.
Best,
-- Axel
Steffen Heublein <steffen.heublein@xxxxxxxxxxxxxx> wrote:
Hello,
I am trying to set up a recursive operation in OCL so that I get all objects that are associated to a certain one (and only those). The context is a BPMN2 process graph and I wish to get a collection with all connectors (i.e. sequence flows) that are successors of a certain node)
My constraint looks like this:
context FlowNode
def: getOutgoingSF(FN : FlowNode) : Set(SequenceFlow)
=
FN.outgoing.targetRef->collect(x|getOutgoingSF(x))->asSet()->union(FN.outgoing.targetRef)
FN.outgoing.targetRef gets the direct successor node(s) of the current node.
As such an operation is not really testable with the OCL Interactive
Console (my current choice for trying out constraints) I am using
Dresden OCL (
http://www.dresden-ocl.org/index.php/DresdenOCL) to evaluate my constraints.
Alas, the syntax checker complains that he can neither resolve the second getOutgoingSF nor (what is strange) the predefined operations asSet() and union().
Now, I am unsure if my recursive code is wrong or if there is some issue with Dresden OCL. Or if there is anything else that i did not think of
(maybe also a simpler way to achieve my goal).
Any help would be greatly appreciated and already thanks for reading this.
Regards,
Steffen
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