OccurrencesFactory.hh

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#ifndef _OCCURRENCES_FACTORY_HH_
#define _OCCURRENCES_FACTORY_HH_

#include <openmodeller/occ_io/OccurrencesReader.hh>
#include <openmodeller/occ_io/DelimitedTextOccurrences.hh>
#include <openmodeller/occ_io/SerializedXmlOccurrences.hh>

#ifdef TERRALIB_FOUND
#include <openmodeller/occ_io/TeOccurrences.hh>
#endif

#ifdef CURL_FOUND
#include <openmodeller/occ_io/TapirOccurrences.hh>
#include <openmodeller/occ_io/GbifOccurrences.hh>
#endif

#include <string>
using std::string;

#include <map>
using std::map;

#include <vector>
using std::vector;

class dllexp OccurrencesFactory
{

private:

  // Function pointer to builder function.
  typedef OccurrencesReader * (*CreateOccurrencesReaderCallback)( const char * source, const char * coordSystem );

  // Map of OccurrencesReader and identifiers.
  typedef map<string, CreateOccurrencesReaderCallback> DriversMap;

public:

  static OccurrencesFactory& instance();
  
  bool registerDriver( const string& driverId, CreateOccurrencesReaderCallback builder );
  
  bool unregisterDriver( const string& driverId );
  
  vector<string> getRegisteredDrivers();

  OccurrencesReader * create( const char * source, const char * coordSystem );

private:

  // Indicates if the factory was initiated (i.e., drivers were registered).
  static bool _initiated;

  // Map of OccurrencesReader and identifiers.
  DriversMap _drivers;
  
  // No constructor allowed (singleton pattern).
  OccurrencesFactory(){};

  // No copy allowed.
  OccurrencesFactory( const OccurrencesFactory& );

  // No copy allowed.
  OccurrencesFactory& operator=( const OccurrencesFactory& );

  // No destructor allowed.
  ~OccurrencesFactory(){};
};

#endif