Re: [rules-users] New to rules engine - help in defining rules
Jeevan,
You are right: the simplest way would be use "forall".
Unfortunatelly it is only available in trunk.
To do it in 3.0.x you will need either a helper attribute or a
helper class. For instance, you may add a "branchLength" attribute to
the tree and define 2 rules:
rule "define length"
when
$t : Tree( branchLength == -1 )
Branch( mytree == $t, $bl : branch_length )
then
$t.setBranchLength( $bl.intValue() );
modify( $t );
end
rule "check length"
when
$t : Tree( $bl : branchLength != -1 )
exists Branch( mytree == $t, branch_length != $bl )
then
// do something because the branch has a different length
end
There are several variations but you will need 2 rules to emulate this.
Hopefully the new version will be out soon solving this kind of problem.
[]s
Edson
Jeevan Tambuluri wrote:
Hello all,
I am looking for a way to define rules for the following problem:
class Tree {
...
}
class Branch {
Tree mytree;
int branch_length;
...
}
Let's say I have a fact called Tree and another fact called Branch.
Brach identifies which tree it belongs to.
Now, I want to write a rule to say that all branches in a tree must be
of same length.
How do I do this with/without using accumulate or forall?
Thanks a lot for any help,
J
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Edson Tirelli
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