[rules-users] Collect with same value

[Wolfgang Laun]

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 <w.mungovan at yahoo.com> 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
>
>
> --
> View this message in context:
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