Accesor.hpp

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// ANNA - Anna is Not Nothingness Anymore                                                         //
//                                                                                                //
// (c) Copyright 2005-2015 Eduardo Ramos Testillano & Francisco Ruiz Rayo                         //
//                                                                                                //
// See project site at http://redmine.teslayout.com/projects/anna-suite                           //
// See accompanying file LICENSE or copy at http://www.teslayout.com/projects/public/anna.LICENSE //


#ifndef anna_dbos_Accesor_hpp
#define anna_dbos_Accesor_hpp

#include <anna/core/RuntimeException.hpp>
#include <anna/core/mt/Mutex.hpp>

#include <anna/dbms/DatabaseException.hpp>

#include <anna/dbos/defines.hpp>

namespace anna {

namespace dbms {
class Database;
class Connection;
class Statement;
}

namespace dbos {

class StorageArea;

class Accesor : public Mutex {
public:
  typedef short Id; 
  virtual ~Accesor();

  Id getId() const { return a_id; }

  dbms::Statement* getStatement()
  noexcept(false) {
    return (a_statement == NULL && a_database != NULL) ? (a_statement = initialize(*a_database)) : a_statement;
  }

  bool hasDataBase() const { return a_database != NULL; }

  dbms::Database& getDatabase() { return *a_database; }

  dbms::Connection& getConnection() noexcept(false) {
    if(a_connection == NULL) {
      std::string msg(asString());
      msg += " | No available database connection";
      throw RuntimeException(msg, ANNA_FILE_LOCATION);
    }

    return *a_connection;
  }

  virtual std::string asString() const  = 0;

  virtual const char* getClassName() const  = 0;

protected:
  Accesor(dbms::Database& database, const Id id) :
    a_database(&database),
    a_id(id),
    a_statement(NULL),
    a_connection(NULL),
    a_emodeIsNull(true)
  {;}

  Accesor(dbms::Database& database, const Id id, const Exception::Mode::_v emode) :
    a_database(&database),
    a_id(id),
    a_statement(NULL),
    a_connection(NULL),
    a_emodeIsNull(false),
    a_exceptionMode(emode)
  {;}

  Accesor(const Id id) :
    a_database(NULL),
    a_id(id),
    a_statement(NULL),
    a_connection(NULL),
    a_emodeIsNull(true)
  {;}

  virtual dbms::Statement* initialize(dbms::Database& database) noexcept(false) = 0;

private:
  dbms::Database* a_database;
  const Id a_id;
  dbms::Statement* a_statement;
  dbms::Connection* a_connection;
  bool a_emodeIsNull;
  Exception::Mode::_v a_exceptionMode;

  void setStatement(dbms::Statement* statement) { a_statement = statement; }

  virtual bool load(dbms::Connection*, const StorageArea*) noexcept(false);

  friend class StorageArea;
};

}
}

#endif