Updates in QA task IO and checker

In this merge request, the subdirectory model of the QA-task output was changed from TFolder to TDirectoryFile. There are two reasons of the modification. Firstly, the TFolder class is a legacy code and is not recommended to be used. Secondly, the reading many objects from a TFolder rapidly causes memory usage increase (even if one simply calls gFile->FindObjectAny("a_folder")).

core/qa/checker/CbmQaCheckerFileHandler.cxx

@@ -22,9 +22,11 @@
 #include "TH2.h"
 #include "TNamed.h"
 #include "TProfile.h"
+#include "TROOT.h"
 
 #include <boost/algorithm/string.hpp>
 
+#include <cstdlib>
 #include <iomanip>
 #include <sstream>
 #include <string>
@@ -163,6 +165,15 @@ void FileHandler::Process(Option_t* opt)
       if (areDifferent) { pObjHandler->CreateCanvases(); }
     }
     pObjHandler->Write();
+
+    // Clean memory
+    for (auto* pObj : vpObjects) {
+      if (pObj) {
+        delete pObj;
+        pObj = nullptr;
+      }
+    }
+
   }  // iObj
 }
 
@@ -170,28 +181,9 @@ void FileHandler::Process(Option_t* opt)
 //
 TNamed* FileHandler::ReadObjectFromFile(TFile* pFile, const std::string& path) const
 {
-  TObject* pObj = pFile;
-  size_t iPos   = 0;  // Index of first symbol
-  size_t iNext  = 0;  // Index of last symbol
-  // Read object iteratively, running throug directories or folders, provided by path
-  while (iPos < path.size()) {
-    // get name
-    iNext = path.find_first_of('/', iPos);
-    if (iNext > path.size()) { iNext = path.size(); }
-    std::string part = path.substr(iPos, iNext - iPos);  // short name of next object/directory/folder in the path
-    iPos             = iNext + 1;
-    if (!part.size()) { continue; }
-
-    // test TDirectoryFile
-    if (dynamic_cast<TDirectoryFile*>(pObj)) {
-      auto* pDir = static_cast<TDirectoryFile*>(pObj);
-      pObj       = pDir->FindObjectAny(part.data());
-    }
-    // test TFolder
-    else if (dynamic_cast<TFolder*>(pObj)) {
-      auto* pDir = static_cast<TFolder*>(pObj);
-      pObj       = pDir->FindObjectAny(part.data());
-    }
-  }
-  return dynamic_cast<TNamed*>(pObj);
+  int iPosSlash        = path.find_last_of('/') + 1;
+  std::string baseName = path.substr(iPosSlash, path.size());
+  std::string pathName = path.substr(0, iPosSlash);
+  if (pathName.size() > 0) { pFile->cd(pathName.c_str()); }
+  return dynamic_cast<TNamed*>(pFile->FindObjectAny(baseName.c_str()));
 }