Added code to save HLT menu in Json form from c++ object

Trigger/TrigConfiguration/TrigConfIO/TrigConfIO/JsonFileWriterHLT.h

+/*
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+*/
+
+/**
+ * @brief Write Json file from HLTMenu object
+ * To validate correct loading of the HLT menu
+ */
+
+#ifndef TRIGCONFSTORAGE_JSONFILEWRITERHLT_H
+#define TRIGCONFSTORAGE_JSONFILEWRITERHLT_H
+
+#include "TrigConfBase/TrigConfMessaging.h"
+#include "TrigConfData/HLTMenu.h"
+
+namespace TrigConf {
+
+   /**
+    * @brief Loader of trigger configurations from Json files
+    */
+   class JsonFileWriterHLT : public TrigConfMessaging {
+   public:
+
+      /** Constructor */
+      JsonFileWriterHLT();
+
+      bool writeJsonFile(const std::string & filename, const HLTMenu & menu) const;
+   };
+
+}
+#endif

Trigger/TrigConfiguration/TrigConfIO/src/JsonFileWriterHLT.cxx

+/*
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+*/
+
+#include "TrigConfIO/JsonFileWriterHLT.h"
+
+#include <iomanip>
+#include <fstream>
+#include <algorithm>
+
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+
+using namespace std;
+
+TrigConf::JsonFileWriterHLT::JsonFileWriterHLT() :
+   TrigConfMessaging( "JsonFileWriter")
+{}
+
+
+bool
+TrigConf::JsonFileWriterHLT::writeJsonFile(const std::string & filename, const HLTMenu & menu) const
+{
+   json chains({});
+   for ( const auto & chain : menu ) {
+      json jChain({});
+      jChain["counter"] = chain.counter();
+      jChain["nameHash"] = chain.name();
+      jChain["l1item"] = chain.l1item();
+      jChain["legMultiplicities"] = chain.legMultiplicities();
+      jChain["l1thresholds"] = chain.l1thresholds();
+      jChain["groups"] = chain.groups();
+      jChain["streams"] = chain.streams();
+      jChain["seqeuncers"] = chain.sequencers();
+      chains[chain.name()] = jChain;
+   }
+
+   json sequencers({});
+   for ( const auto [seqName, algsList]: menu.sequencers() ) {
+      json jSeq( algsList );
+      sequencers[seqName] = jSeq;
+   }
+   json streams({});
+   for ( const auto stream: menu.streams() ) {
+      json jStream({});
+      jStream["name"] = stream["name"];
+      jStream["type"] = stream["type"];
+      jStream["obeyLB"] = stream.getAttribute<bool>("obeyLB");
+      jStream["forceFullEventBuilding"] = stream.getAttribute<bool>("forceFullEventBuilding");
+      streams[stream["name"]] = jStream;
+   }
+
+
+   json j({});
+   j["filetype"] = "hltmenu";
+   j["name"] = menu.name();
+   j["chains"] = chains;
+   j["sequencers"] = sequencers;
+   j["streams"] = streams;
+
+
+   std::ofstream outfile(filename);
+   outfile << std::setw(4) << j << std::endl;
+
+   TRG_MSG_INFO("Saved file " << filename);
+   return true;
+}

Trigger/TrigConfiguration/TrigConfIO/utils/TriggerMenuRW.cxx

@@ -7,6 +7,7 @@
 
 #include "TrigConfIO/JsonFileLoader.h"
 #include "TrigConfIO/JsonFileWriter.h"
+#include "TrigConfIO/JsonFileWriterHLT.h"
 #include "TrigConfIO/TrigDBMenuLoader.h"
 #include "TrigConfIO/TrigDBJobOptionsLoader.h"
 #include "TrigConfIO/TrigDBL1PrescalesSetLoader.h"
@@ -170,15 +171,21 @@ namespace {
          filename += ".json";
          TrigConf::JsonFileLoader fileLoader;
          return fileLoader.saveFile(filename, ds); 
-      } else if ( cfg.writeFromDataStructure && kind=="L1Menu" ) {
+      } else if ( cfg.writeFromDataStructure ) {
          std::string filename = kind;
          if ( cfg.base != "" ) {
             filename += "_" + cfg.base;
          }
          filename += ".fromDS.json";
-         TrigConf::JsonFileWriter fileWriter;
-         const auto & l1menu = dynamic_cast<const TrigConf::L1Menu &>(ds);
-         return fileWriter.writeJsonFile(filename, l1menu); 
+         if ( kind=="L1Menu" ) {
+            TrigConf::JsonFileWriter fileWriter;
+            const auto & l1menu = dynamic_cast<const TrigConf::L1Menu &>(ds);
+            return fileWriter.writeJsonFile(filename, l1menu); 
+         } else if ( kind == "HLTMenu") {
+            TrigConf::JsonFileWriterHLT fileWriter;
+            const auto & hltmenu = dynamic_cast<const TrigConf::HLTMenu &>(ds);
+            return fileWriter.writeJsonFile(filename, hltmenu);
+         }
       }
       return true;
    }