From f483cdffdaaa42d5df8725e7cad776484ded835d Mon Sep 17 00:00:00 2001
From: Bernardo Sulzbach <mafagafogigante@gmail.com>
Date: Mon, 12 Oct 2015 16:54:19 -0300
Subject: [PATCH] World.addLocation() should throw an exception.

---
 src/main/java/org/dungeon/game/World.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/org/dungeon/game/World.java b/src/main/java/org/dungeon/game/World.java
index cfad894c..53e1b03e 100644
--- a/src/main/java/org/dungeon/game/World.java
+++ b/src/main/java/org/dungeon/game/World.java
@@ -58,6 +58,9 @@ public Date getWorldDate() {
   }
 
   public void addLocation(Location locationObject, Point coordinates) {
+    if (locations.containsKey(coordinates)) {
+      throw new IllegalStateException("tried to repeatedly add a location to " + coordinates + ".");
+    }
     locations.put(coordinates, locationObject);
     worldStatistics.addLocation(locationObject.getName().getSingular());
   }