[rules-users] Collect with same value

[wendy]

thank you.



________________________________
From: Wolfgang Laun-2 [via Drools] <ml-node+3243337-1322012020-394790 at n3.nabble.com>
To: wendy <w.mungovan at yahoo.com>
Sent: Wednesday, August 10, 2011 1:31 PM
Subject: Re: [rules-users] Collect with same value


rule "get big shapes by color"
when
  $map: Map()
    from accumulate ( $shape: Shapes( $color: color, size > 5 ),
      init( Map m = new HashMap(); ),
      action( List list = m.get( $color );
                 if( list == null ) list = new ArrayList();
                 list.add( shape ); ),
      result( m ) )
then
   // process $map to get all lists of same color
end

Untested.

-W


On 10 August 2011 17:20, wendy <[hidden email]> wrote:

Hi,
> I'm trying to write the following rule but am having some trouble.
>
> We have a object say Shape and which has attributes size and color.  I
>want to get a list of all shapes with the same color that have size > 5.
>How can I make sure the color is the same for all objects in the collect
>without having different rules for 'red', 'green'...?
>
>Thank you,
>Wendy
>
>
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