--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Common/ResultBase.cpp	Wed Jul 04 08:16:29 2018 +0200
@@ -0,0 +1,160 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 Osimis S.A., 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 "ResultBase.h"
+
+#include "../Common/BinaryStringValue.h"
+#include "../Common/Integer64Value.h"
+#include "../Common/NullValue.h"
+#include "../Common/Utf8StringValue.h"
+
+#include <Core/Logging.h>
+#include <Core/OrthancException.h>
+
+#include <cassert>
+#include <memory>
+
+namespace OrthancDatabases
+{
+  void ResultBase::ClearFields()
+  {
+    for (size_t i = 0; i < fields_.size(); i++)
+    {
+      if (fields_[i] != NULL)
+      {
+        delete fields_[i];
+        fields_[i] = NULL;
+      }
+    }
+  }
+
+
+  void ResultBase::ConvertFields()
+  {
+    assert(expectedType_.size() == fields_.size() &&
+           hasExpectedType_.size() == fields_.size());
+      
+    for (size_t i = 0; i < fields_.size(); i++)
+    {
+      if (fields_[i] == NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+      }
+
+      ValueType sourceType = fields_[i]->GetType();
+      ValueType targetType = expectedType_[i];
+
+      if (hasExpectedType_[i] &&
+          sourceType != ValueType_Null &&
+          sourceType != targetType)
+      {
+        std::auto_ptr<IValue> converted(fields_[i]->Convert(targetType));
+        
+        if (converted.get() == NULL)
+        {
+          LOG(ERROR) << "Cannot convert between data types from a database";
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_BadParameterType);
+        }
+        else
+        {
+          assert(fields_[i] != NULL);
+          delete fields_[i];
+          fields_[i] = converted.release();
+        }
+      }
+    }
+  }
+
+
+  void ResultBase::FetchFields()
+  {
+    ClearFields();
+
+    if (!IsDone())
+    {
+      for (size_t i = 0; i < fields_.size(); i++)
+      {
+        fields_[i] = FetchField(i);
+
+        if (fields_[i] == NULL)
+        {
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+        }
+      }
+
+      ConvertFields();
+    }
+  }
+    
+
+  void ResultBase::SetFieldsCount(size_t count)
+  {
+    if (!fields_.empty())
+    {
+      // This method can only be invoked once
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+    }
+    
+    fields_.resize(count);
+    expectedType_.resize(count, ValueType_Null);
+    hasExpectedType_.resize(count, false);
+  }
+    
+
+  void ResultBase::SetExpectedType(size_t field,
+                                   ValueType type)
+  {
+    assert(expectedType_.size() == fields_.size() &&
+           hasExpectedType_.size() == fields_.size());
+      
+    if (field < fields_.size())
+    {
+      expectedType_[field] = type;
+      hasExpectedType_[field] = true;
+
+      if (!IsDone())
+      {
+        ConvertFields();
+      }
+    }
+  }
+  
+
+  const IValue& ResultBase::GetField(size_t index) const
+  {
+    if (IsDone())
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+    }
+    else if (index >= fields_.size())
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+    else if (fields_[index] == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+    }
+    else
+    {
+      return *fields_[index];
+    }
+  }
+}