.. _program_listing_file_Root_MetHistsAlgo.cxx:

Program Listing for File MetHistsAlgo.cxx
=========================================

|exhale_lsh| :ref:`Return to documentation for file <file_Root_MetHistsAlgo.cxx>` (``Root/MetHistsAlgo.cxx``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include <EventLoop/Job.h>
   #include <EventLoop/StatusCode.h>
   #include <EventLoop/Worker.h>
   #include "AthContainers/ConstDataVector.h"
   #include "xAODEventInfo/EventInfo.h"
   #include "xAODAnaHelpers/HelperFunctions.h"
   
   #include <xAODAnaHelpers/MetHistsAlgo.h>
   
   // this is needed to distribute the algorithm to the workers
   ClassImp(MetHistsAlgo)
   
   MetHistsAlgo :: MetHistsAlgo () :
       Algorithm("MetHistsAlgo")
   {
   }
   
   EL::StatusCode MetHistsAlgo :: setupJob (EL::Job& job)
   {
     job.useXAOD();
   
     // let's initialize the algorithm to use the xAODRootAccess package
     xAOD::Init("MetHistsAlgo").ignore(); // call before opening first file
   
     return EL::StatusCode::SUCCESS;
   }
   
   EL::StatusCode MetHistsAlgo :: histInitialize ()
   {
   
     ANA_MSG_INFO( m_name );
     ANA_CHECK( xAH::Algorithm::algInitialize());
     if( m_inContainerName.empty() || m_detailStr.empty() ){
       ANA_MSG_ERROR( "One or more required configuration values are empty");
       return EL::StatusCode::FAILURE;
     }
   
     // declare class and add histograms to output
     m_plots = new MetHists(m_name, m_detailStr);
     ANA_CHECK( m_plots -> initialize());
     m_plots -> record( wk() );
   
     return EL::StatusCode::SUCCESS;
   }
   
   EL::StatusCode MetHistsAlgo :: fileExecute () { return EL::StatusCode::SUCCESS; }
   EL::StatusCode MetHistsAlgo :: changeInput (bool /*firstFile*/) { return EL::StatusCode::SUCCESS; }
   
   EL::StatusCode MetHistsAlgo :: initialize ()
   {
     ANA_MSG_INFO( "MetHistsAlgo");
     m_event = wk()->xaodEvent();
     m_store = wk()->xaodStore();
     return EL::StatusCode::SUCCESS;
   }
   
   EL::StatusCode MetHistsAlgo :: execute ()
   {
     const xAOD::EventInfo* eventInfo(nullptr);
     ANA_CHECK( HelperFunctions::retrieve(eventInfo, m_eventInfoContainerName, m_event, m_store, msg()) );
   
   
     float eventWeight(1);
     if( eventInfo->isAvailable< float >( "mcEventWeight" ) ) {
       eventWeight = eventInfo->auxdecor< float >( "mcEventWeight" );
     }
   
     const xAOD::MissingETContainer* met(nullptr);
     ANA_CHECK( HelperFunctions::retrieve(met, m_inContainerName, m_event, m_store, msg()) );
   
     ANA_CHECK( m_plots->execute( met, eventWeight ));
   
     return EL::StatusCode::SUCCESS;
   }
   
   EL::StatusCode MetHistsAlgo :: postExecute () { return EL::StatusCode::SUCCESS; }
   EL::StatusCode MetHistsAlgo :: finalize () { return EL::StatusCode::SUCCESS; }
   EL::StatusCode MetHistsAlgo :: histFinalize ()
   {
     // clean up memory
     if(m_plots) delete m_plots;
   
     ANA_CHECK( xAH::Algorithm::algFinalize());
     return EL::StatusCode::SUCCESS;
   }