--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/LayerSourceBase.cpp	Tue May 16 22:12:41 2017 +0200
@@ -0,0 +1,76 @@
+/**
+ * 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/>.
+ **/
+
+
+#include "LayerSourceBase.h"
+
+#include "../../Resources/Orthanc/Core/OrthancException.h"
+
+namespace OrthancStone
+{
+  void LayerSourceBase::NotifySourceChange()
+  {
+    if (observer_ != NULL)
+    {
+      observer_->NotifySourceChange(*this);
+    }
+  }
+
+  void LayerSourceBase::NotifySliceChange(const SliceGeometry& slice)
+  {
+    if (observer_ != NULL)
+    {
+      observer_->NotifySliceChange(*this, slice);
+    }
+  }
+
+  void LayerSourceBase::NotifyLayerReady(ILayerRenderer* layer,
+                                         ILayerSource& source,
+                                         const SliceGeometry& viewportSlice)
+  {
+    if (layer == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+    
+    if (observer_ != NULL)
+    {
+      observer_->NotifyLayerReady(layer, *this, viewportSlice);
+    }
+    else
+    {
+      delete layer;
+    }
+  }
+
+  void LayerSourceBase::NotifyLayerError(ILayerSource& source,
+                                         const SliceGeometry& viewportSlice)
+  {
+    if (observer_ != NULL)
+    {
+      observer_->NotifyLayerError(*this, viewportSlice);
+    }
+  }
+
+  void LayerSourceBase::SetObserver(IObserver& observer)
+  {
+    observer_ = &observer;
+  }
+}