JDBToolkit.hh

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#ifndef __JDB_JDBTOOLKIT__
#define __JDB_JDBTOOLKIT__

#include <string>
#include <map>

#include "JLang/JException.hh"
#include "JLang/JSingleton.hh"

#include "JDB/JDB.hh"
#include "JDB/JSelector.hh"
#include "JDB/JSelectorSupportkit.hh"
#include "JDB/JDetectors.hh"


/**
 * \author mdejong
 */

namespace JDATABASE {};
namespace JPP { using namespace JDATABASE; }

/**
 * Auxiliary classes and methods for database I/O.
 */
namespace JDATABASE {

  using JLANG::JDatabaseException;
  using JLANG::JSingleton;

  /**
   * Auxiliary class for mapping serial number and object identifier of detectors.
   */
  struct JDetectorsHelper :
    public JSingleton<JDetectorsHelper>
  {
    /**
     * Initialise.
     */
    static void initialise()
    {
      ResultSet& rs  = JDB::get()->StreamDS(getTable<JDetectors>(), JSelector());

      for (JDetectors parameters; rs >> parameters; ) {
        getInstance().det2id[parameters.OID] = parameters.SERIALNUMBER;
        getInstance().id2det[parameters.SERIALNUMBER] = parameters.OID;
      }

      rs.Close();
    }


    /**
     * Get detector serial number.
     *
     * \param  detid                 object identifier
     * \return                       serial number
     */
    int operator()(const std::string& detid) const
    {
      std::map<std::string, int>::const_iterator p = det2id.find(detid);

      if (p == det2id.end()) {
        
        ResultSet& rs  = JDB::get()->StreamDS(getTable<JDetectors>(), getSelector<JDetectors>(detid));

        JDetectors parameters; 

        if (rs >> parameters) {

          rs.Close();

          det2id[parameters.OID] = parameters.SERIALNUMBER;
          id2det[parameters.SERIALNUMBER] = parameters.OID;

          return parameters.SERIALNUMBER;
        }

      } else {
        
        return p->second;
      }

      THROW(JDatabaseException, "Invalid detector identifier " << detid);
    }


    /**
     * Get detector identifier.
     *
     * \param  id                    serial number
     * \return                       object identifier
     */
    inline std::string operator()(const int id) const
    {
      std::map<int, std::string>::const_iterator p = id2det.find(id);

      if (p == id2det.end()) {

        ResultSet& rs  = JDB::get()->StreamDS(getTable<JDetectors>(), getSelector<JDetectors>(id));

        JDetectors parameters; 

        if (rs >> parameters) {

          rs.Close();

          id2det[parameters.SERIALNUMBER] = parameters.OID;
          det2id[parameters.OID] = parameters.SERIALNUMBER;

          return parameters.OID;
        }

      } else {

        return p->second;
      }

      THROW(JDatabaseException, "Invalid detector identifier " << id);
    }

  protected:
    mutable std::map<int, std::string> id2det;
    mutable std::map<std::string, int> det2id;
  };


  /**
   * Function object for mapping serial number and object identifier of detectors.
   */
  static const JDetectorsHelper& getDetector = JDetectorsHelper::getInstance();
}

#endif