Re: [rules-users] New to rules engine - help in defining rules

Thanks Edson! The rule pattern you suggested works for me. Any such pattern to simulate "accumulate" in 3.0.x? Jeevan Edson Tirelli wrote: > > 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 >> > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users