HardScatterVertexDecorator.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
// Author: Matthew Basso (matthew.joseph.basso@cern.ch)
// A very simple tool for decorating vertices as hardscatter or not-hardscatter
 
// Local include(s):
#include "DerivationFrameworkInDet/HardScatterVertexDecorator.h"
 
// FrameWork include(s):
#include "AthLinks/ElementLink.h"
#include "StoreGate/ReadHandle.h"
#include "StoreGate/WriteDecorHandle.h"
 
// EDM include(s):
#include "xAODTracking/VertexContainer.h"
 
namespace DerivationFramework {
 
  StatusCode HardScatterVertexDecorator::initialize()
  {
    // Print configuration
    ATH_MSG_DEBUG("Initializing " << name() << "...");
    ATH_MSG_DEBUG("Using VertexContainerName: "      << m_vtxContKey);
    ATH_MSG_DEBUG("Using HardScatterSelectionTool: " << m_vtxSelectTool);
 
    if (m_vtxContKey.empty()) {
      ATH_MSG_ERROR("No xAOD::VertexContainer provided!");
      return StatusCode::FAILURE;
    }
 
    if (m_vtxSelectTool.empty()) {
      ATH_MSG_ERROR("No InDet::IInDetHardScatterSelectionTool provided!");
      return StatusCode::FAILURE;
    }
 
    // Initialize our vertex and event info container reads
    ATH_CHECK(m_vtxContKey.initialize());
    ATH_CHECK(m_evtInfoKey.initialize());
 
    // Instantiate and initialize our event info decorator write
    ATH_CHECK(m_evtDecoKey.initialize());
    // Fetch our InDet::IInDetHardScatterSelectionTool
    ATH_CHECK(m_vtxSelectTool.retrieve());
    return StatusCode::SUCCESS;
  }
 
  StatusCode HardScatterVertexDecorator::addBranches(const EventContext& ctx) const
  {
    ATH_MSG_DEBUG("In addBranches(...) for " << name() <<  "...");
 
 
    // Open our vertex container
    SG::ReadHandle<xAOD::VertexContainer> vtxCont(m_vtxContKey, ctx);
    if (!vtxCont.isValid()) {
      ATH_MSG_ERROR("Unable to retrieve xAOD::VertexContainer!");
      return StatusCode::FAILURE;
    }
 
    // Open our event info
    SG::ReadHandle<xAOD::EventInfo> evtInfo(m_evtInfoKey, ctx);
    if (!evtInfo.isValid()) {
      ATH_MSG_ERROR("Unable to retrieve xAOD::EventInfo!");
      return StatusCode::FAILURE;
    }
 
    // Instantiate our WriteDecorHandle
    SG::WriteDecorHandle<xAOD::EventInfo, ElementLink<xAOD::VertexContainer>> evtDeco(m_evtDecoKey, ctx);
 
    // Decorate our event info
    evtDeco(*evtInfo) = m_vtxSelectTool->getHardScatterLink(vtxCont.get());
 
    return StatusCode::SUCCESS;
  }
 
} // end: namespace DerivationFramework