CachedProducts.cc

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#include <algorithm>

#include "boost/bind.hpp"

#include "FWCore/Framework/interface/CachedProducts.h"
#include "FWCore/Utilities/interface/Algorithms.h"

namespace edm 
{
  namespace detail
  {
    typedef detail::NamedEventSelector NES;


    CachedProducts::CachedProducts() :
      fillDone_(false),
      numberFound_(0),
      selectors_()
    { }

    void
    CachedProducts::setupDefault(std::vector<std::string> const& triggernames)
    {

      // Set up one NamedEventSelector, with default configuration
      std::vector<std::string> paths;
      EventSelector es(paths, triggernames);
      NES nes("", es);
      selectors_.push_back(nes);
      //selectors_.push_back(NES("", EventSelector("",triggernames)));
    }

    void
    CachedProducts::setup(std::vector<parsed_path_spec_t> const& path_specs,
              std::vector<std::string> const& triggernames,
                          const std::string& process_name)
    {
      // paths_for_process maps each PROCESS names to a sequence of
      // PATH names
      std::map<std::string, std::vector<std::string> > paths_for_process;
      for (std::vector<parsed_path_spec_t>::const_iterator 
         i = path_specs.begin(), 
         e = path_specs.end();
       i != e;
       ++i)
    {
          // Default to current process if none specified
          if (i->second == "") {
            paths_for_process[process_name].push_back(i->first);
          }
          else {
            paths_for_process[i->second].push_back(i->first);
          }
    }
      // Now go through all the PROCESS names, and create a
      // NamedEventSelector for each.
      for (std::map<std::string, std::vector<std::string> >::const_iterator
         i = paths_for_process.begin(),
         e = paths_for_process.end();
       i != e;
       ++i)
    {
          // For the current process we know the trigger names
          // from the configuration file
          if (i->first == process_name) {
            selectors_.push_back(NES(i->first, 
                   EventSelector(i->second, 
                         triggernames)));
          }
          // For previous processes we do not know the trigger
          // names yet.
          else {
            selectors_.push_back(NES(i->first, 
                   EventSelector(i->second)));
          }
    }
    }

    CachedProducts::handle_t
    CachedProducts::getOneTriggerResults(Event const& ev)
    {
      fill(ev);
      return returnOneHandleOrThrow();
    }

    bool
    CachedProducts::wantEvent(Event const& ev)
    {
      // We have to get all the TriggerResults objects before we test
      // any for a match, because we have to deal with the possibility
      // of multiple TriggerResults objects --- note that the presence
      // of more than one TriggerResults object in the event is
      // intended to lead to an exception throw *unless* either the
      // configuration has been set to match all events, or the
      // configuration is set to use specific process names.

      fill(ev);

      // Now we go through and see if anyone matches...
      iter i = selectors_.begin();
      iter e = selectors_.end();
      bool match_found = false;
      while (!match_found && (i!=e))
    {
      match_found = i->match();
      ++i;
    }
      return match_found;
    }
    
    CachedProducts::handle_t
    CachedProducts::returnOneHandleOrThrow()
    {
      switch (numberFound_)
    {
    case 0:
      throw edm::Exception(edm::errors::ProductNotFound,
                   "TooFewProducts")
        << "CachedProducts::returnOneHandleOrThrow: "
        << " too few products found, "
        << "exepcted one, got zero\n";
    case 1:

      break;
    default:
      throw edm::Exception(edm::errors::ProductNotFound,
                   "TooManyMatches")
        << "CachedProducts::returnOneHandleOrThrow: "
        << "too many products found, "
        << "expected one, got " << numberFound_ << '\n';
    }
      return selectors_[0].product();
    }

    CachedProducts::size_type
    CachedProducts::fill(Event const& ev)
    {
      if (!fillDone_)
    {
      fillDone_ = true;
      for (iter i = selectors_.begin(), e = selectors_.end(); 
           i != e; ++i)
        {
          i->fill(ev);     // fill might throw...
          ++numberFound_ ; // so numberFound_ might be less than expected
        }
    }
      return numberFound_;
    }

    void
    CachedProducts::clear()
    { 
      for_all(selectors_, boost::bind(&NamedEventSelector::clear, _1));
      fillDone_ = false;
      numberFound_ = 0;
    }


  } // namespace detail
} // namespace edm