From 4b8876b1c6749682d623fce4693f307c803f2016 Mon Sep 17 00:00:00 2001
From: Stefan Schroeder <4sschroeder@gmail.com>
Date: Mon, 2 Sep 2013 17:20:49 +0200
Subject: [PATCH] add precondition to service: capacity-demand must be greater
 than or equal to zero

---
 jsprit-core/src/main/java/basics/Service.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/jsprit-core/src/main/java/basics/Service.java b/jsprit-core/src/main/java/basics/Service.java
index b35481b6..17c52371 100644
--- a/jsprit-core/src/main/java/basics/Service.java
+++ b/jsprit-core/src/main/java/basics/Service.java
@@ -41,7 +41,7 @@ public class Service implements Job {
 		protected int demand;
 		
 		Builder(String id, int size) {
-			super();
+			if(size < 0) throw new IllegalArgumentException("size must be greater than or equal to zero");
 			this.id = id;
 			this.demand = size;
 		}
@@ -62,6 +62,7 @@ public class Service implements Job {
 		}
 		
 		public Builder setServiceTime(double serviceTime){
+			if(serviceTime < 0) throw new IllegalArgumentException("serviceTime must be greate than or equal to zero");
 			this.serviceTime = serviceTime;
 			return this;
 		}