--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/buildings/helper/building-position-allocator.h	Wed Feb 29 12:28:16 2012 +0100
@@ -0,0 +1,88 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (C) 2012 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Nicola Baldo <nbaldo@cttc.es>
+ */
+#ifndef BUILDING_POSITION_ALLOCATOR_H
+#define BUILDING_POSITION_ALLOCATOR_H
+
+#include <ns3/ptr.h>
+#include <ns3/position-allocator.h>
+
+namespace ns3 {
+
+class Building;
+
+
+/**
+ * Allocate each position by randomly chosing a building from the list
+ * of all buildings, and then randomly chosing a position inside the building.
+ * 
+ */
+class RandomBuildingPositionAllocator : public PositionAllocator
+{
+public:
+  RandomBuildingPositionAllocator ();
+
+  // inherited from Object
+  static TypeId GetTypeId (void);
+
+  // inherited from PositionAllocator
+  virtual Vector GetNext (void) const;
+
+private:
+  
+  bool m_withReplacement;
+  mutable std::vector< Ptr<Building> > m_buildingListWithoutReplacement;
+};
+
+
+/**
+ * Allocate each position by randomly chosing a room from the list
+ * of all buildings, and then randomly chosing a position inside the room.
+ * The selection of the room is always done without replacement.
+ * 
+ */
+class RandomRoomPositionAllocator : public PositionAllocator
+{
+public:
+  RandomRoomPositionAllocator ();
+
+  // inherited from Object
+  static TypeId GetTypeId (void);
+
+  // inherited from PositionAllocator
+  virtual Vector GetNext (void) const;
+
+private:
+  
+  bool m_withReplacement;
+  struct RoomInfo 
+  {
+    Ptr<Building> b;
+    uint32_t roomx;
+    uint32_t roomy;
+    uint32_t floor;
+  };
+  mutable std::vector<RoomInfo> m_roomListWithoutReplacement;
+};
+
+
+
+} // namespace ns3
+
+#endif /* BUILDING_POSITION_ALLOCATOR_H */