InputSourceFactory.cc

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#include "art/Framework/Core/InputSourceFactory.h"
// vim: set sw=2 expandtab :

#include "art/Framework/Core/InputSource.h"
#include "art/Utilities/PluginSuffixes.h"
#include "art/Version/GetReleaseVersion.h"
#include "canvas/Utilities/DebugMacros.h"
#include "canvas/Utilities/Exception.h"
#include "cetlib/LibraryManager.h"
#include "cetlib/detail/wrapLibraryManagerException.h"
#include "fhiclcpp/ParameterSet.h"

#include <memory>
#include <string>

using namespace std;
using fhicl::ParameterSet;

namespace art {
  namespace InputSourceFactory {

    unique_ptr<InputSource>
    make(ParameterSet const& conf, InputSourceDescription& desc)
    {
      auto const& libspec = conf.get<string>("module_type");
      FDEBUG(1) << "InputSourceFactory: module_type = " << libspec << endl;
      using make_t =
        unique_ptr<InputSource>(ParameterSet const&, InputSourceDescription&);
      make_t* symbol = nullptr;
      try {
        cet::LibraryManager lm_{Suffixes::source()};
        lm_.getSymbolByLibspec(libspec, "make", symbol);
      }
      catch (Exception const& e) {
        cet::detail::wrapLibraryManagerException(
          e, "InputSource", libspec, getReleaseVersion());
      }
      if (symbol == nullptr) {
        throw Exception(errors::Configuration, "BadPluginLibrary")
          << "InputSource " << libspec
          << " has internal symbol definition problems: consult an expert.";
      }
      auto wm = symbol(conf, desc);
      FDEBUG(1) << "InputSourceFactory: created input source " << libspec
                << endl;
      return wm;
    }

  } // namespace InputSourceFactory
} // namespace art