/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/EventFilter/StorageManager/interface/TriggerSelector.h

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// $Id: TriggerSelector.h,v 1.7 2011/03/07 15:31:32 mommsen Exp $

#ifndef EventFilter_StorageManager_TriggerSelector_h
#define EventFilter_StorageManager_TriggerSelector_h

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Common/interface/HLTPathStatus.h"
#include "DataFormats/Common/interface/TriggerResults.h"
#include "DataFormats/Provenance/interface/ParameterSetID.h"
#include "FWCore/Framework/interface/EventSelector.h"

#include "boost/shared_ptr.hpp"

#include <vector>
#include <string>

namespace stor
{

  class TriggerSelector
  {
    public:

      typedef std::vector<std::string> Strings;

      TriggerSelector(Strings const& pathspecs,
          Strings const& names);

      TriggerSelector(edm::ParameterSet const& pset,
          Strings const& triggernames, bool old_ = false);

      TriggerSelector(std::string const& expression, Strings const& triggernames);

      ~TriggerSelector() {};

      bool wantAll() const { 
        //if (useOld_) return eventSelector_->wantAll();
        return acceptAll_; 
      }

      bool acceptEvent(edm::TriggerResults const&) const;

      /*
       * Takes array of trigger results and a number of triggers in array and returns
       * if it passes selection
       */
      bool acceptEvent(unsigned char const*, int) const;

      /*
       * Returns if HLTGlobalStatus passes selection
       */
      bool returnStatus(edm::HLTGlobalStatus const& trStatus) const {
        return masterElement_->returnStatus(trStatus);
      }

      /*
       * Does XMl compatible formatting of the selection string
       */
      static std::string makeXMLString(std::string const& input);

      /*
       * Obsolete: Returns SelectedEvents vector from ParameterSet
       */
      static std::vector<std::string>
        getEventSelectionVString(edm::ParameterSet const& pset);

    private:

      bool acceptAll_;

      /*
       * Starts parsing selection string
       */
      void init(std::string const& path, Strings const& triggernames);

      /* 
       * Removes extra spaces from string
       */
      static std::string trim(std::string input);

      /*
       * Class used for storing internal representation of the selection string
       */
      class TreeElement {

        enum TreeOperator {
          NonInit = 0,
          AND = 1,
          OR  = 2,
          NOT = 3,
          BR = 4
        };

        public:

        /*
         * Parser of selection string. Splits string into tokens and initializes new elements to parse them.
         */
        TreeElement(std::string const& inputString,Strings const& tr,TreeElement* parentElement = NULL);
        ~TreeElement();

        /*
         * Returns selection status of current element calculated recursively from it's child elements
         */
        bool returnStatus(edm::HLTGlobalStatus const& trStatus) const;

        /*
         * Returns operator type of the element
         */
        TreeOperator op() const {return op_;}

        /*
         * Returns parent element
         */
        TreeElement * parent() const {return parent_;}

        private:

        TreeElement * parent_;
        std::vector<TreeElement*> children_;
        TreeOperator op_;
        int trigBit_;
      };

      boost::shared_ptr<TreeElement> masterElement_;

      //keep a copy of initialization string
      std::string expression_;

      boost::shared_ptr<edm::EventSelector> eventSelector_;
      bool useOld_;

      static const bool debug_ = false;

  };

  typedef boost::shared_ptr<TriggerSelector> TriggerSelectorPtr;

} // namespace stor

#endif // EventFilter_StorageManager_TriggerSelector_h