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Mon, 29 December 2014 11:45

Eclipse User

Hi all,

I am having an error to execute the bellow code, it gives this error.
The transformation encountered an error: Entity excepted as the Container parameter of the ElementCreateRule rule instead of String. (see the Error Log view for details)

The error happens when I create Vote1 as an attribute inside element Voter1:
new(Agent.vote(Vote1) in fqn(Voter1));

It executes only to creates the Voter1, but not the rest (Vote1, and the relations).

When I change fqn() to:
new(Agent.vote(Vote1) in startGraph.model.Voter1);

the problem is :
- Model element constant 'startGraph.model.Voter1' is non-existing in the model space.

index.php/fa/20327/0/

gtrule createNode()=
{
precondition pattern lhs(Voter2,Vote2)=
{
Agent(Voter2);
Agent.vote(Vote2);
Agent.attr(V2Attr,Voter2,Vote2);
check(toBoolean(value(Vote2))==false);
}

action {
let Voter1=undef,Vote1=undef,V1Attr=undef in
seq
{
new(Agent(Voter1) in startGraph.model);
new(instanceOf(Voter1,metamodel.Agent));
rename(Voter1,"Voter"+name(Voter1));

// node Vote1 in Voter1
new(Agent.vote(Vote1) in fqn(Voter1));
new(Agent.attr(V1Attr,Voter1,Vote1));
setValue(Vote1,"false");
new(instanceOf(V1Attr,metamodel.Agent.attr));
new(instanceOf(Vote1,metamodel.Agent.vote));
println("nodes created");

}
}

}

Attachment: Vote1.jpg
(Size: 65.56KB, Downloaded 560 times)

Re: Attribute problem [message #1535557 is a reply to message #1535317]

Mon, 29 December 2014 14:52

Eclipse User

Hi,

I guess the problematic line is " new(Agent.vote(Vote1) in fqn(Voter1)); " where the fqn function returns a string, but the new operation expects a model element (as described by the error message you have seen).

I have not tried it, but I guess, simply removing the fqn call would work, as follows:

new(Agent.vote(Vote1) in Voter1);

Cheers,
Zoltán

Re: Attribute problem [message #1536811 is a reply to message #1535557]

Tue, 30 December 2014 07:47

Eclipse User

Hi Zoltan,

Thanks for the reply. Now it works.

Just one more question please, to run a loop for creating certain amount of nodes, any better idea than the bellow? Because (Transformation executing) doesn't stop.

The idea is to create up to 1000 nodes with 'false' attribute and the same number with 'true'. Then make random connections between them.

rule main()= seq
{
let K=5 in
iterate
seq{
if (K>0)
seq{
forall with apply createNode();
update K=K-1;
}
skip;
}
}

Thanks
Moss

Re: Attribute problem [message #1536836 is a reply to message #1536811]

Tue, 30 December 2014 08:07

Eclipse User

This way it looks a bit easier to read:

rule main()= seq {
  let K=5 in iterate seq{
    if (K>0) seq{
      forall with apply createNode();
      update K=K-1;
    }
    skip;
  }
}

The problem might be that skip will not break the iterate loop, just restart the cycle core. You should use fail to exit the loop.

See https://wiki.eclipse.org/VIATRA2/Examples/VTCL/ASM

Re: Attribute problem [message #1537946 is a reply to message #1536836]

Tue, 30 December 2014 22:50

Eclipse User

Hi Abel,

sorry my bad.

Yes, fail does the job.

Many Thanks

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