From 353c3d6e2611cb281397bc1a4187f860ce9d6f9f Mon Sep 17 00:00:00 2001
From: Congqiao Li <congqiao.li@cern.ch>
Date: Sat, 10 Jul 2021 09:03:55 +0200
Subject: [PATCH] Detect the original GEN module name for
 ExternalGeneratorFilter set moduleName to its original module name as
 ExternalGeneratorFilter is a wrapper of a specific generator filter

---
 PhysicsTools/JetMCAlgos/plugins/HadronAndPartonSelector.cc | 6 ++++++
 TopQuarkAnalysis/TopEventProducers/src/TopDecaySubset.cc   | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/PhysicsTools/JetMCAlgos/plugins/HadronAndPartonSelector.cc b/PhysicsTools/JetMCAlgos/plugins/HadronAndPartonSelector.cc
index 4fd7b9f6e7b47..90714b1edff4e 100644
--- a/PhysicsTools/JetMCAlgos/plugins/HadronAndPartonSelector.cc
+++ b/PhysicsTools/JetMCAlgos/plugins/HadronAndPartonSelector.cc
@@ -142,6 +142,12 @@ void HadronAndPartonSelector::produce(edm::Event& iEvent, const edm::EventSetup&
     if (genEvtInfoProduct.isValid()) {
       const edm::StableProvenance& prov = iEvent.getStableProvenance(genEvtInfoProduct.id());
       moduleName = edm::moduleName(prov, iEvent.processHistory());
+      if (moduleName == "ExternalGeneratorFilter") {
+        moduleName = parameterSet(prov, iEvent.processHistory()).getParameter<std::string>("@external_type");
+        edm::LogInfo("SpecialModule")
+            << "GEN events are produced by ExternalGeneratorFilter, "
+            << "which is a wrapper of the original module: " << moduleName;
+      }
     }
 
     if (moduleName.find("Pythia6") != std::string::npos)
diff --git a/TopQuarkAnalysis/TopEventProducers/src/TopDecaySubset.cc b/TopQuarkAnalysis/TopEventProducers/src/TopDecaySubset.cc
index 68730351ccc95..bc7b2fec5c286 100644
--- a/TopQuarkAnalysis/TopEventProducers/src/TopDecaySubset.cc
+++ b/TopQuarkAnalysis/TopEventProducers/src/TopDecaySubset.cc
@@ -247,6 +247,12 @@ TopDecaySubset::ShowerModel TopDecaySubset::checkShowerModel(edm::Event& event)
   if (genEvtInfoProduct.isValid()) {
     const edm::StableProvenance& prov = event.getStableProvenance(genEvtInfoProduct.id());
     moduleName = edm::moduleName(prov, event.processHistory());
+    if (moduleName == "ExternalGeneratorFilter") {
+      moduleName = parameterSet(prov, event.processHistory()).getParameter<std::string>("@external_type");
+      edm::LogInfo("SpecialModule")
+          << "GEN events are produced by ExternalGeneratorFilter, "
+          << "which is a wrapper of the original module: " << moduleName;
+    }
   }
 
   ShowerModel shower(kStart);