JWeightEventHelper.hh

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#ifndef __JAANET__JWEIGHTEVENTHELPER__
#define __JAANET__JWEIGHTEVENTHELPER__

#include "JAAnet/JHead.hh"
#include "JAAnet/JHeadToolkit.hh"
#include "JLang/JSharedPointer.hh"
#include "JLang/JException.hh"
#include "JSupport/JMultipleFileScanner.hh"
#include "JSupport/JMonteCarloFileSupportkit.hh"
#include "JWeightEvent.hh"


namespace JAANET {

  using JLANG::JNullPointerException;
  using JLANG::JSharedPointer;
  using JSUPPORT::JMultipleFileScanner_t;


  /**
   * Helper class for event weighing.
   */
  struct JWeightEventHelper :
    public JHead,
    public JSharedPointer<JWeightEvent>
  {
    using JHead::is_valid;
    using JSharedPointer<JWeightEvent>::is_valid;


    /**
     * Configuration.
     *
     * \param  input_files       input files
     * \return                   true if okay; else false
     */
    bool configure(const JMultipleFileScanner_t& input_files)
    {
      setHeader(JSUPPORT::getHeader(input_files));

      if (is_valid())
        return get()->configure(getHeader());
      else
        return false;
    }

  
    /**
     * Get weight of given event.
     *
     * \param  evt               event
     * \return                   weight [1/s]
     */
    double getWeight(const Evt& evt) const
    {
      if (is_valid())
        return get()->getWeight(evt);
      else
        THROW(JNullPointerException, "JWeightEventHelper::getWeight(): null pointer.");
    }
  };
}

#endif