[rules-users] foreach in drl file

[Joe White]

Phil,
Take a look at the manual and look for the "forall" LHS conditional element if you can pass all of your objects individually. Or if you must pass your items into WM as a List then take a look at the "collect" LHS element examples.

In your example if you wanted to say "All Golfers have red pants" it would look something like


import com.sample.Golfer;
import java.util.List;
import java.util.ArrayList;

rule "test"
when

	$list : List() //<--The list you use insert into working memory
	ArrayList( size == $list.size) from collect (Golfer(pantsColor=="red") from $list)
	
then
	System.out.println("HIT");
End

I didn't run it but you get the idea.

Joe
-----Original Message-----
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of can_man at gmx.de
Sent: Monday, February 16, 2009 3:58 PM
To: rules-users at lists.jboss.org
Subject: Re: [rules-users] foreach in drl file

Hello,


> maybe you can tell us what you are trying to do? Are you talking about  
> the RHS?
> 
> --Ingomar

thank you for your reply. I would like to use a template drl file together with a java class. Both the LHS and RHS should contain variables, where the LHS should itterate over a collection in the "when" part.

So for example, in the golf example, I would like a foreach which itterates through a list in my java class, e.g. "Golfer", and addes the conditions in the collection to my rule with "ANDs".

rule "find solution"
    when
        // cut 

        Golfer( 

        @foreach{item : products} 
        - @{item.serialNumber}
        @end{}

        )

	then
           // do something
end

My problem is that I don't really know how to write the foreach syntax.
Hope this is clear.

Thank you.
Phil

> Am 16.02.2009 um 23:15 schrieb can_man at gmx.de:
> 
> > Hello,
> >
> > I would like to itterate over a list in a drl template file, I  
> > looked at http://mvel.codehaus.org/MVEL+2.0+Orb+Tags
> >
> > @foreach{item : products}
> > - @{item.serialNumber}
> > @end{}
> >
> > but I just can't get the syntax right. Could someone please post an  
> > example drl file with a foreach.
> >
> > Thank you very much.
> > Phil
> > -- 
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> 
> 
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