modeling the problem

jsprit-core/src/main/java/algorithms/RuinRadial.java

@@ -38,7 +38,7 @@ import basics.route.VehicleRoute;
 
 /**
  * 
- * RuinStrategy that ruins the neighborhood of a randomly selected service. The size and the structure of the neighborhood is defined by 
+ * RuinStrategy that ruins the neighborhood of a randomly selected job. The size and the structure of the neighborhood is defined by 
  * the share of jobs to be removed and the distance between jobs (where distance not necessarily mean Euclidean distance but an arbitrary 
  * measure).
  * 

jsprit-core/src/main/java/basics/Shipment.java

@@ -133,7 +133,7 @@ public class Shipment implements Job{
 		return demand;
 	}
 
-	public int getDemand() {
+	public int getSize() {
 		return demand;
 	}
 

jsprit-core/src/main/java/basics/VehicleRoutingProblem.java

@@ -236,7 +236,10 @@ public class VehicleRoutingProblem {
 			if(job instanceof Service) { 
 				addService((Service) job);
 			}
-			else throw new IllegalStateException("job can only be a shipment or a service, but is instance of " + job.getClass());
+			else{
+				if(jobs.containsKey(job.getId())){ logger.warn("job " + job + " already in job list. overrides existing job."); }
+				jobs.put(job.getId(),job);
+			}
 			return this;
 		}
 
@@ -357,6 +360,10 @@ public class VehicleRoutingProblem {
 		public Collection<Service> getAddedServices(){
 			return Collections.unmodifiableCollection(services);
 		}
+		
+		public Collection<Job> getAddedJobs(){
+			return Collections.unmodifiableCollection(jobs.values());
+		}
 }
 	
 	/**