/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/TrigDecisionTool/TrigDecisionTool/FeatureCollectStandalone.h

// -*- c++ -*-
#ifndef TRIGGER_DECISION_TOOL_FeatureCollectStandalone_H
#define TRIGGER_DECISION_TOOL_FeatureCollectStandalone_H


/**********************************************************************************
 * @Project:
 * @Package: TrigDecision
 *
 *
 * @author Nicolas Berger  <Nicolas.Berger@cern.ch>  - LAPP Annecy
 * @author Tomasz Bold     <tomasz.bold@cern.ch>     - UC Irvine, AGH-UST Krakow
 * @author Lukas Heinrich  <lukas.heinrich@cern.ch>  - NYU
 *
 ***********************************************************************************/

#include <string>
#include <set>
#include "boost/foreach.hpp"
#include "boost/type_traits/is_same.hpp"
#include "boost/shared_ptr.hpp"
#include "boost/lexical_cast.hpp"

#include "TrigDecisionTool/Conditions.h"
#include "TrigDecisionTool/TDTUtilities.h"

#include "TrigDecisionTool/Feature.h"

#include "TrigSteeringEvent/TrigPassBits.h"
#include "TrigSteeringEvent/TrigPassBitsCollection.h"

#include "TrigSteeringEvent/TrigRoiDescriptor.h"
#include "TrigRoiConversion/RoiSerialise.h"
#include "xAODTrigger/RoiDescriptorStore.h"

#include "TrigDecisionTool/TypelessFeature.h"
#include "TrigDecisionTool/EventPtrDef.h"

#include "TrigNavStructure/TrigNavStructure.h"

#include "AsgTools/AsgToolsConf.h"
#include "AsgTools/Check.h"

#include "TrigNavStructure/TypedHolder.h"

namespace HLT{
  class TrigNavStructure;
}



namespace Trig {

  namespace FeatureAccessImpl{
 
    HLT::TriggerElement::FeatureAccessHelper getTypelessBits(const HLT::TriggerElement* te, const HLT::TrigNavStructure* navigation);

    void typelessCollect(const HLT::TriggerElement* te, HLT::class_id_type clid, std::vector<Trig::TypelessFeature>& data, const std::string& label, unsigned int condition, HLT::TrigNavStructure* navigation);
    

    template<typename REQUESTED,typename STORED, typename CONTAINER>
    std::vector<Trig::Feature<REQUESTED> > typedGet(const std::vector<TypelessFeature>& features, HLT::TrigNavStructure* navigation, EventPtr_t store,const std::string& container_name = ClassID_traits<CONTAINER>::typeName());


    
    //do not implement
    template<typename STORED, typename REQUESTED>
    void insert_element(std::vector<Trig::Feature<REQUESTED> >&, Trig::TypelessFeature&, const STORED*);
    //do implement
    template<typename REQUESTED>
    void insert_element(std::vector<Trig::Feature<REQUESTED> >& result, Trig::TypelessFeature& feature, const REQUESTED* element){
      result.push_back(Trig::Feature<REQUESTED>(feature,element));
    }


    template<typename STORED>
    void insert_flatten_if(std::vector<Trig::Feature<STORED> >& result, const Trig::TypelessFeature& feature, const std::shared_ptr<const STORED>& newfeature){
      result.push_back(Trig::Feature<STORED>(feature,newfeature));
    }

    template<typename REQUESTED, typename STORED>
    void insert_flatten_if(std::vector<Trig::Feature<REQUESTED> >& result,  const Trig::TypelessFeature& feature, const std::shared_ptr<const STORED>& newfeature){
      for(auto element : *newfeature){
    result.push_back(Trig::Feature<REQUESTED>(feature,element));
      }
    }


    template<typename STORED>
    std::shared_ptr<const STORED> filter_if(boost::mpl::bool_<true> is_same, std::shared_ptr<const STORED>& original,const TrigPassBits* bits){ 
      (void)is_same;


      if(original->size() != bits->size()){
    std::cerr << "WARNING: bits size and owned size" << std::endl;
    return original;
      }
      STORED* f = new STORED;
      f->clear(SG::VIEW_ELEMENTS);
  
      for(auto obj : *original){
    if(HLT::isPassing(bits,obj,original.get())){
      f->push_back(const_cast<typename STORED::value_type>(obj));
    }
      }
      //manage the memory
      std::shared_ptr<const STORED> filtered(f);
      return filtered;
    }

    template<typename STORED>
    std::shared_ptr<const STORED> filter_if(boost::mpl::bool_<false> /*is_same*/, std::shared_ptr<const STORED>& original,const TrigPassBits* /*bits*/){
      //nothing
      return original;
    }

    template<typename REQUESTED,typename STORED, typename CONTAINER>
    std::vector<Trig::Feature<REQUESTED> > typedGet(const std::vector<TypelessFeature>& features, HLT::TrigNavStructure* navigation, EventPtr_t store, const std::string& container_name) {
      std::vector<Trig::Feature<REQUESTED> > typedvec;

      for(auto feature : features){
    auto typelessholder = navigation->getHolder(feature.accessHelper());
    if(!typelessholder){
      std::cerr << "ERROR, holder not present" << std::endl;
    }
    HLT::TypedHolder<STORED,CONTAINER> typedholder(*typelessholder,store,container_name);
    const STORED* dest = 0;

    StatusCode sc = typedholder.get(dest,feature.accessHelper().getIndex());
    if(sc.isFailure()){
      std::cerr << "TrigDecisionTool WARNING: Feature access failed for feature: " << feature.accessHelper() << std::endl;
      continue;
    }

    if(boost::is_same<STORED,CONTAINER>::value){
      //take ownership because typedholder.get created VIEW container with 'new'
      std::shared_ptr<const STORED> owned(dest);
      
      auto passbitsFeatureAccessHelper = FeatureAccessImpl::getTypelessBits(feature.te(),navigation);
      if(passbitsFeatureAccessHelper.valid()){
#ifndef __CLING__
        auto passbitsHolder = navigation->getHolder(passbitsFeatureAccessHelper);
        HLT::TypedHolder<TrigPassBits,TrigPassBitsCollection> typedBits(*passbitsHolder,store);
        const TrigPassBits* bits = 0;
        if(typedBits.get(bits,passbitsFeatureAccessHelper.getIndex()).isFailure()){
          std::cerr << "WARNING: couldn't get passbits from Holder" << std::endl;
        }
        owned = filter_if(boost::is_same<STORED,CONTAINER>(),owned,bits);
#endif
      }
      //if REQUESTED != STORED we assume REQUESTED is element type
      //and we flatten the vector
      insert_flatten_if(typedvec,feature,owned);
    }
    else{
      if(boost::is_same<STORED,TrigRoiDescriptor>::value){
         std::shared_ptr<const STORED> owned(dest);
         //TrigRoiDescriptor needs deletiong by us.. a bit hacky but oh well...
         insert_flatten_if(typedvec,feature,owned);
      }
      else{
        //storegate owns the pointer
        insert_element(typedvec,feature,dest);
      }
    }
      }
      return typedvec;
    }
  } // EOF namespace FeatureAccessImpl

} // EOF namespace Trig


namespace HLT{
  template<>
  class TypedHolder<TrigRoiDescriptor,TrigRoiDescriptorCollection> : public TypelessHolder, public asg::AsgMessaging {
  public:
    TypedHolder(const BaseHolder& baseholder, EventPtr store, const std::string& container_name = "") 
      : TypelessHolder(baseholder.typeClid(),baseholder.label(),baseholder.subTypeIndex()), 
    asg::AsgMessaging("TypedHolder"),
    m_store(store){
      (void)container_name;//unused
    };
    
    StatusCode get(const TrigRoiDescriptor*& destination, HLT::TriggerElement::ObjectIndex idx){

      std::string key = HLTNavDetails::formatSGkey("HLT","xAOD::RoiDescriptorStore",this->label());
      const xAOD::RoiDescriptorStore* roistore = 0;
      ASG_CHECK(m_store->retrieve(roistore,key));
      
      // so what's happening here is a bit hacky since StoreGate stores (and owns)
      // the RoiDescriptorStore. But the IRoiDescriptor pointers that get created
      // by RoiUtil::deserialize are new pointers, so we need to manage them
      // So we deserialize the entire collection, pick the one pointed to by 
      // the object index and mark it as the return value and the delete the rest again
      // Later the single remaining element will be deleted by the Feature
      // (which will have the owning flag set for RoIs). Hopefully the performance
      // penalty is not too large

      std::vector<const IRoiDescriptor*> rois;
      RoiUtil::deserialise( roistore->serialised(), rois );
      if((idx.objectsEnd() - idx.objectsBegin())!=1){
    ATH_MSG_ERROR("accessing RoI holder with key: is not single element: ");
    return StatusCode::FAILURE;
      }
      
      if(rois.size() < idx.objectsBegin()){
    ATH_MSG_ERROR("deserialized roi collection too small");
    return StatusCode::FAILURE;
      };
      for (unsigned int index = 0; index < rois.size(); ++index){
    if(index == idx.objectsBegin()){
      destination = dynamic_cast<const TrigRoiDescriptor*>(rois.at(index));
    }
    else{
      delete rois.at(index);
    }
      }
      return StatusCode::SUCCESS;    
    }
  private:
    EventPtr m_store;
  };
}



#endif

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