--- a/Framework/StoneException.h	Mon Sep 10 12:20:14 2018 +0200
+++ b/Framework/StoneException.h	Mon Sep 10 12:22:05 2018 +0200
@@ -22,10 +22,91 @@
 #pragma once
 
 #include "Core/OrthancException.h"
+#include <boost/lexical_cast.hpp>
 
 namespace OrthancStone
 {
+  enum ErrorCode
+  {
+    ErrorCode_Success,
+    ErrorCode_OrthancError, // this StoneException is actually an OrthancException with an Orthanc error code
+    ErrorCode_ApplicationException, // this StoneException is specific to an application (and should have its own internal error code)
+    ErrorCode_NotImplemented, // case not implemented
+    ErrorCode_PromiseSingleSuccessHandler, // a Promise can only have a single success handler
+    ErrorCode_PromiseSingleFailureHandler, // a Promise can only have a single failure handler
 
+    ErrorCode_Last
+  };
+
+
+
+  class StoneException
+  {
+  protected:
+    OrthancStone::ErrorCode     errorCode_;
+
+  public:
+    explicit StoneException(ErrorCode errorCode) :
+      errorCode_(errorCode)
+    {
+    }
+
+    ErrorCode GetErrorCode() const
+    {
+      return errorCode_;
+    }
+
+    virtual const char* What() const
+    {
+      return "TODO: EnumerationToString for StoneException";
+    }
+  };
+
+  class StoneOrthancException : public StoneException
+  {
+  protected:
+    Orthanc::OrthancException&  orthancException_;
+
+  public:
+    explicit StoneOrthancException(Orthanc::OrthancException& orthancException) :
+      StoneException(ErrorCode_OrthancError),
+      orthancException_(orthancException)
+    {
+    }
+
+    Orthanc::ErrorCode GetOrthancErrorCode() const
+    {
+      return orthancException_.GetErrorCode();
+    }
+
+    virtual const char* What() const
+    {
+      return orthancException_.What();
+    }
+  };
+
+  class StoneApplicationException : public StoneException
+  {
+  protected:
+    int applicationErrorCode_;
+
+  public:
+    explicit StoneApplicationException(int applicationErrorCode) :
+      StoneException(ErrorCode_ApplicationException),
+      applicationErrorCode_(applicationErrorCode)
+    {
+    }
+
+    int GetApplicationErrorCode() const
+    {
+      return applicationErrorCode_;
+    }
+
+    virtual const char* What() const
+    {
+      return boost::lexical_cast<std::string>(applicationErrorCode_).c_str();
+    }
+  };
 
 }