[rules-users] To group some objects by type

[mdzaebel]

Mister Nono wrote
> ... only the last car is in the TreeMap

Thats why I said "/you need Lists or Maps as values of the TreeMap/".

*Here is fast solution:*
import Vehicle
import java.util.*
rule "Print grouped vehicles"
    when  $map : Map() from accumulate ($v : Vehicle($w : wheels), 
    				init(TreeMap map=new TreeMap()), 
    				action( if(map.containsKey($w)) ((List)map.get($w)).add($v); 
    				            else map.put($w, new ArrayList(Arrays.asList($v)));),
    				result(map))
    then  System.out.println($map);
end



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