--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Volumes/VolumeLoaderBase.h	Thu Nov 16 13:46:03 2017 +0100
@@ -0,0 +1,49 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017 Osimis, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "IVolumeLoader.h"
+#include "../Toolbox/ObserversRegistry.h"
+
+namespace OrthancStone
+{
+  class VolumeLoaderBase : public IVolumeLoader
+  {
+  private:
+    typedef ObserversRegistry<IVolumeLoader, IObserver>  Observers;
+
+    Observers  observers_;
+
+  protected:
+    virtual void NotifyGeometryReady();
+      
+    virtual void NotifyGeometryError();
+    
+    virtual void NotifyContentChange();
+
+  public:
+    virtual void Register(IObserver& observer)
+    {
+      observers_.Register(observer);
+    }
+  };
+}