Input: 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1 0,0,109,20,0,0,0,19,100644,-1,-1,-1,-1,-1,-1 0,0,109,20,0,0,0,19,100644,-1,-1,-1,-1,-1,-1 0,0,106,28,0,0,0,26,137745,-1,-1,-1,-1,-1,-1 0,0,108,32,0,0,0,67,354281,-1,-1,-1,-1,-1,-1 0,0,105,30,0,0,1,94,501089,-1,-1,-1,-1,-1,-1 Problem: Should find vehicles with same data (if it occurs more than thrice). Though eval in rule 'Detect Accident' results in true, consequence is not fired. Output: Added Not Found -- 107---2 test---2----107 Not Found -- 107---3 test---3----107 Not Found -- 107---4 test---4----107 no of veh : 1 no of veh : 1 no of veh : 1 Not Found -- 109---5 test---1----109 Not Found -- 109---6 test---2----109 Not Found -- 106---7 Please find the DRL below. package com.hp.hpl.CHAOS.LR; # importing classes import java.lang.Integer; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import com.hp.hpl.CHAOS.Rules.VehicleLocation; global java.lang.String output declare VehicleLocation @role ( event ) @expires ( 1m ) end declare Statistics smashedcars : ArrayList stopped_cars : ArrayList accidents : ArrayList collided_at : HashMap end rule "Setup statistics" salience 110 no-loop true when not( Statistics( ) ) vehLoc : VehicleLocation() then Statistics s = new Statistics(); s.setSmashedcars (new ArrayList()); s.setStopped_cars (new ArrayList()); s.getStopped_cars().add(vehLoc); s.setCollided_at(new HashMap()); insert( s ); System.out.println("Added"); end rule "Add to stopped cars" salience 100 no-loop true when vehLoc : VehicleLocation() $stat : Statistics () ((not( VehicleLocation(vid == vehLoc.vid) from $stat.getSmashedcars()))) then modify($stat) { getStopped_cars().add(vehLoc); } System.out.println("Not Found -- " + vehLoc.getVid() + "---" + $stat.getStopped_cars().size()); end rule "Identify Collided Vehicles" salience 90 no-loop true when vehLoc : VehicleLocation() $stat : Statistics () $allStoppedcars : ArrayList( size > 0 ) from collect ( VehicleLocation(xway == vehLoc.xway, pos == vehLoc.pos, dir == vehLoc.dir, lane == vehLoc.lane) from $stat.stopped_cars) then System.out.println("test" + "---" + $allStoppedcars.size() + "----" + vehLoc.getVid()); modify($stat) { setCollided_at(collided_at($allStoppedcars, vehLoc.getXway(), vehLoc.getPos(), vehLoc.getDir(), vehLoc.getLane())); } retract (vehLoc); end rule "Detect Accident" salience 80 no-loop true when vehLoc : VehicleLocation() $stat : Statistics () eval(collision_occured($stat.getCollided_at())) then System.out.println("Detect Accident"); end function HashMap collided_at(ArrayList stopped_cars, int x, int pos, int dir, int lane) { HashMap collided_at = new HashMap(); for (Iterator iterator = stopped_cars.iterator(); iterator.hasNext(); ) { VehicleLocation vehLoc = (VehicleLocation) iterator.next(); if (vehLoc.getXway() == x && vehLoc.getPos() == pos && vehLoc.getDir() == dir && vehLoc.getLane() == lane) { int key = vehLoc.getVid(); if (!collided_at.containsKey(key)) { collided_at.put (key, new Integer(1)); continue; } collided_at.put (key, ((Integer)collided_at.get(key)).intValue()+1); } } return collided_at; } function boolean collision_occured(HashMap collided_vehicles) { java.util.Set entries = collided_vehicles.entrySet(); int noOfCollidedVehicles = 0; java.util.Iterator iterator = entries.iterator(); while ( iterator.hasNext() ) { java.util.Map.Entry object = (java.util.Map.Entry) iterator.next(); if ((Integer)object.getValue() > 3) { noOfCollidedVehicles += 1; } } if (noOfCollidedVehicles > 0) { System.out.println("no of veh : " + noOfCollidedVehicles); return true; } return false; } Please let me know what should I correct here. -- View this message in context: http://www.nabble.com/Using-eval-in-LHS-tp24646946p24646946.html Sent from the drools - user mailing list archive at Nabble.com.