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(a)yahoo.com&gt; wrote:

I'm still not sure I can make my rule work like that. Sorry, my real problem is a little more complicated then I initially described. We are trying to detect if some set of conditions stay within a set of ranges over a period of time. So still using the example below. The color is really the key for the shape and the size can change over time. For example, we would want to know if any shape's size was larger than 5 for 20 min. I see how you are making a map that would have a list of all the shapes of the same color. So $map['BLUE'] would return all shapes and $shape: Shapes( $color: color, size > 5 ) could change to $shape: Shapes( $color: color, size > 5 ) over window:time(20m) to only get Shape sizes for the last 20 min. now this would be a map where the key would be the color and the value would be the min size over a 20 min window. //untested $map: Map() from accumulate ( $shape: Shapes( $color: color) over window:time(20m), init( Map m = new HashMap(); ), action( Number min = m.get( $color ); if( min == null ) m.put($shape.size); else if (min > $shape.size) m.put($shape.size);), result( m ) ) and then I would need to iterate through the map and find all the ones whose min size > 5? -- View this message in context: http://drools.46999.n3.nabble.com/Collect-with-same-value-tp3242904p32455... Sent from the Drools: User forum mailing list archive at Nabble.com.

Right. But we don't want to match if the size dropped below 5 during the last 20 m. so if the size for BLUE are: Time 0 5 10 15 20 25 30 35 40 45 50 Size 5 6 7 6 6 6 6 6 6 4 6 at times 25,30,35,40 we would want to trigger but not at 0, 45 or 50. -- View this message in context: http://drools.46999.n3.nabble.com/Collect-with-same-value-tp3242904p32459... Sent from the Drools: User forum mailing list archive at Nabble.com.