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 > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >