Pass filename instead of pointer to FileBackedExperimentInfo

Refs #11220

Code/Mantid/Framework/MDAlgorithms/src/LoadMD.cpp

@@ -180,7 +180,7 @@ void LoadMD::exec() {
 
     // Now the ExperimentInfo
     bool lazyLoadExpt = fileBacked;
-    MDBoxFlatTree::loadExperimentInfos(m_file.get(), ws, lazyLoadExpt);
+    MDBoxFlatTree::loadExperimentInfos(m_file.get(), m_filename, ws, lazyLoadExpt);
 
     // Wrapper to cast to MDEventWorkspace then call the function
     CALL_MDEVENT_FUNCTION(this->doLoad, ws);
@@ -231,7 +231,7 @@ void LoadMD::loadHisto() {
   MDHistoWorkspace_sptr ws(new MDHistoWorkspace(m_dims));
 
   // Now the ExperimentInfo
-  MDBoxFlatTree::loadExperimentInfos(m_file.get(), ws);
+  MDBoxFlatTree::loadExperimentInfos(m_file.get(), m_filename, ws);
 
   // Load the WorkspaceHistory "process"
   ws->history().loadNexus(m_file.get());

Code/Mantid/Framework/MDEvents/inc/MantidMDEvents/MDBoxFlatTree.h

@@ -122,7 +122,7 @@ class DLLExport MDBoxFlatTree {
   /// name of the event type
   std::string m_eventType;
   /// shared pointer to multiple experiment info stored within the workspace
-  boost::shared_ptr<Mantid::API::MultipleExperimentInfos> m_mEI;
+  boost::shared_ptr<API::MultipleExperimentInfos> m_mEI;
 
 public:
   static ::NeXus::File *createOrOpenMDWSgroup(const std::string &fileName,
@@ -137,7 +137,8 @@ class DLLExport MDBoxFlatTree {
   // function
   static void loadExperimentInfos(
       ::NeXus::File *const file,
-      boost::shared_ptr<Mantid::API::MultipleExperimentInfos> ei,
+      const std::string & filename,
+      boost::shared_ptr<API::MultipleExperimentInfos> ei,
       bool lazy = false);
 
   static void saveAffineTransformMatricies(::NeXus::File *const file,

Code/Mantid/Framework/MDEvents/src/MDBoxFlatTree.cpp

@@ -285,7 +285,7 @@ void MDBoxFlatTree::loadBoxStructure(const std::string &fileName, int &nDim,
       m_mEI = boost::make_shared<Mantid::API::MultipleExperimentInfos>(
           Mantid::API::MultipleExperimentInfos());
 
-    loadExperimentInfos(hFile.get(), m_mEI);
+    loadExperimentInfos(hFile.get(), fileName, m_mEI);
   }
 
   // close workspace group
@@ -395,13 +395,13 @@ void MDBoxFlatTree::saveExperimentInfos(::NeXus::File *const file,
 *
 * @param file :: the pointer to the properly opened nexus data file where the
 *experiment info groups can be found.
+* @param filename :: the filename of the opened NeXus file. Use for the file-backed case
 * @param mei :: MDEventWorkspace/MDHisto to load experiment infos to or rather
 *pointer to the base class of this workspaces (which is an experimentInfo)
 * @param lazy :: If true, use the FileBackedExperimentInfo class to only load
 * the data from the file when it is requested
 */
-void MDBoxFlatTree::loadExperimentInfos(
-    ::NeXus::File *const file,
+void MDBoxFlatTree::loadExperimentInfos(::NeXus::File *const file, const std::string &filename,
     boost::shared_ptr<Mantid::API::MultipleExperimentInfos> mei,
     bool lazy) {
   // First, find how many experimentX blocks there are
@@ -449,7 +449,7 @@ void MDBoxFlatTree::loadExperimentInfos(
     std::string groupName = "experiment" + Kernel::Strings::toString(*itr);
     if (lazy) {
       auto ei = boost::make_shared<API::FileBackedExperimentInfo>(
-        file, file->getPath() + "/" + groupName);
+        filename, file->getPath() + "/" + groupName);
       // And add it to the mutliple experiment info.
       mei->addExperimentInfo(ei);
      }