--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/Engine/SetOfResources.h	Thu Dec 20 16:06:38 2018 +0100
@@ -0,0 +1,79 @@
+/**
+ * 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 General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * 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, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "../../OrthancServer/IDatabaseWrapper.h"
+
+#include <set>
+#include <boost/noncopyable.hpp>
+#include <memory>
+
+namespace Orthanc
+{
+  class SetOfResources : public boost::noncopyable
+  {
+  private:
+    typedef std::set<int64_t>  Resources;
+
+    IDatabaseWrapper&         database_;
+    ResourceType              level_;
+    std::auto_ptr<Resources>  resources_;
+    
+  public:
+    SetOfResources(IDatabaseWrapper& database,
+                   ResourceType level) : 
+      database_(database),
+      level_(level)
+    {
+    }
+
+    ResourceType GetLevel() const
+    {
+      return level_;
+    }
+
+    void Intersect(const std::list<int64_t>& resources);
+
+    void GoDown();
+
+    void Flatten(std::list<int64_t>& result);
+
+    void Flatten(std::list<std::string>& result);
+
+    void Clear()
+    {
+      resources_.reset(NULL);
+    }
+  };
+}