DPL: more fixes to handle the ROOT v6-36-00 (#14341)

- More tweaks to get ROOT::Experimental out of the way
- RNTuples cannot have / as first character in name

Author: ktf

Framework/AnalysisSupport/src/Plugin.cxx

@@ -121,10 +121,11 @@ std::vector<std::string> getListOfTables(std::unique_ptr<TFile>& f)
       break;
     }
 
+#if __has_include(<ROOT/RFieldBase.hxx>)
     void* v = f->GetObjectChecked(key->GetName(), TClass::GetClass("ROOT::RNTuple"));
-    if (!v) {
-      v = f->GetObjectChecked(key->GetName(), TClass::GetClass("ROOT::Experimental::RNTuple"));
-    }
+#else
+    void* v = f->GetObjectChecked(key->GetName(), TClass::GetClass("ROOT::Experimental::RNTuple"));
+#endif
     if (v) {
       std::string s = key->GetName();
       size_t pos = s.find('-');

Framework/AnalysisSupport/src/RNTuplePlugin.cxx

@@ -45,7 +45,6 @@ using DPLFieldToken = rns::REntry::RFieldToken;
 using DPLLocalIndex = rns::RClusterIndex;
 #endif
 
-
 template class
   std::unique_ptr<rns::RNTupleReader>;
 
@@ -188,15 +187,17 @@ class RNTupleFileFormat : public arrow::dataset::FileFormat
 };
 
 template <typename T>
-requires requires (T&& f) { f.GetSubFields(); }
-auto getSubfields(T const&field) {
-    return field.GetSubFields();
+  requires requires(T&& f) { f.GetSubFields(); }
+auto getSubfields(T const& field)
+{
+  return field.GetSubFields();
 }
 
 template <typename T>
-requires requires (T&& f) { f.GetConstSubfields(); }
-auto getSubfields(T const&field) {
-    return field.GetConstSubfields();
+  requires requires(T&& f) { f.GetConstSubfields(); }
+auto getSubfields(T const& field)
+{
+  return field.GetConstSubfields();
 }
 
 struct RootNTupleVisitor : public rns::Detail::RFieldVisitor {
@@ -284,7 +285,6 @@ struct RootNTupleVisitor : public rns::Detail::RFieldVisitor {
   }
 #endif
 
-
   void VisitBoolField(const rns::RField<bool>& field) override
   {
     this->datatype = arrow::boolean();
@@ -562,18 +562,19 @@ class RNTupleFileWriter : public arrow::dataset::FileWriter
 };
 
 template <typename T>
-requires requires (T const&m) { m.GetFieldZero(); }
-auto &getFieldZero(T const &m) {
+  requires requires(T const& m) { m.GetFieldZero(); }
+auto& getFieldZero(T const& m)
+{
   return m.GetFieldZero();
 }
 
 template <typename T>
-requires requires (T const&m) { m.GetConstFieldZero(); }
-auto &getFieldZero(T const &m) {
+  requires requires(T const& m) { m.GetConstFieldZero(); }
+auto& getFieldZero(T const& m)
+{
   return m.GetConstFieldZero();
 }
 
-
 arrow::Result<std::shared_ptr<arrow::Schema>> RNTupleFileFormat::Inspect(const arrow::dataset::FileSource& source) const
 {
 

Framework/Core/src/Plugin.cxx

@@ -222,21 +222,36 @@ struct RNTupleObjectReadingCapability : o2::framework::RootObjectReadingCapabili
   {
     auto context = new ImplementationContext;
 
-    return new RootObjectReadingCapability{
+    return new RootObjectReadingCapability
+    {
       .name = "rntuple",
-      .lfn2objectPath = [](std::string s) {
+      .lfn2objectPath = [](std::string s) -> std::string {
          std::replace(s.begin()+1, s.end(), '/', '-');
+#if __has_include(<ROOT/RFieldBase.hxx>)
+         if (s.starts_with("/")) {
+          return std::string(s.begin() + 1, s.end());
+        } else {
+          return s;
+        } },
+#else
          if (s.starts_with("/")) {
           return s;
         } else {
           return "/" + s;
         } },
+#endif
+#if __has_include(<ROOT/RFieldBase.hxx>)
+      .getHandle = getHandleByClass("ROOT::RNTuple"),
+      .checkSupport = matchClassByName("ROOT::RNTuple"),
+#else
       .getHandle = getHandleByClass("ROOT::Experimental::RNTuple"),
       .checkSupport = matchClassByName("ROOT::Experimental::RNTuple"),
+#endif
       .factory = [context]() -> RootArrowFactory& {
         lazyLoadFactory(context->implementations, "O2FrameworkAnalysisRNTupleSupport:RNTupleObjectReadingImplementation");
         return context->implementations.back();
-      }};
+      }
+    };
   }
 };
 

Framework/Core/test/test_Root2ArrowTable.cxx

@@ -73,7 +73,7 @@ TEST_CASE("RootTree2Fragment")
   /// A directory holding a tree
 
   /// Create a simple TTree
-  TBufferFile* file = new TBufferFile(TBuffer::kWrite);
+  auto* file = new TBufferFile(TBuffer::kWrite);
 
   TTree t1("t1", "a simple Tree with simple variables");
   Float_t xyz[3];
@@ -519,7 +519,11 @@ TEST_CASE("RootTree2Dataset")
     validateContents(batch);
   }
 
+#if __has_include(<ROOT/RFieldBase.hxx>)
+  arrow::fs::FileLocator rnTupleLocator{outFs, "rntuple"};
+#else
   arrow::fs::FileLocator rnTupleLocator{outFs, "/rntuple"};
+#endif
   // We write an RNTuple in the same TMemFile, using /rntuple as a location
   auto rntupleDestination = std::dynamic_pointer_cast<TDirectoryFileOutputStream>(*destination);
 
@@ -530,7 +534,11 @@ TEST_CASE("RootTree2Dataset")
   }
 
   // And now we can read back the RNTuple into a RecordBatch
+#if __has_include(<ROOT/RFieldBase.hxx>)
+  arrow::dataset::FileSource writtenRntupleSource("rntuple", outFs);
+#else
   arrow::dataset::FileSource writtenRntupleSource("/rntuple", outFs);
+#endif
 
   REQUIRE(rNtupleFormat->IsSupported(writtenRntupleSource) == true);