koffice/kexi/kexidb/drivermanager_p.h

/* This file is part of the KDE project
   Copyright (C) 2003 Jaroslaw Staniek <js@iidea.pl>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/

#ifndef KEXIDB_DRIVER_MNGR_P_H
#define KEXIDB_DRIVER_MNGR_P_H

#include <kexidb/object.h>

#include <tqobject.h>
#include <tqasciidict.h>

namespace KexiDB {

/*! Internal class of driver manager.
*/
class KEXI_DB_EXPORT DriverManagerInternal : public TQObject, public KexiDB::Object
{
	Q_OBJECT
  
	public:
		~DriverManagerInternal();

		/*! Tries to load db driver \a name.
			\return db driver, or 0 if error (then error message is also set) */
		KexiDB::Driver* driver(const TQString& name);

		KexiDB::Driver::Info driverInfo(const TQString &name);

		static DriverManagerInternal *self();

		/*! increments the refcount for the manager */
		void incRefCount();

		/*! decrements the refcount for the manager
			if the refcount reaches a value less than 1 the manager is freed */
		void decRefCount();

		/*! Called from Driver dtor (because sometimes KLibrary (used by Driver) 
		 is destroyed before DriverManagerInternal) */
		void aboutDelete( Driver* drv );

	protected slots:
		/*! Used to destroy all drivers on TQApplication quit, so even if there are 
		 DriverManager's static instances that are destroyed on program 
		 "static destruction", drivers are not kept after TQApplication death.
		*/
		void slotAppQuits();

	protected:
		/*! Used by self() */
		DriverManagerInternal();

		bool lookupDrivers();

		static KexiDB::DriverManagerInternal* s_self;

		DriverManager::ServicesMap m_services; //! services map
		DriverManager::ServicesMap m_services_lcase; //! as above but service names in lowercase
		DriverManager::ServicesMap m_services_by_mimetype;
		Driver::InfoMap m_driversInfo; //! used to store drivers information
		TQAsciiDict<KexiDB::Driver> m_drivers;
		ulong m_refCount;

		TQString m_serverErrMsg;
		int m_serverResultNum;
		TQString m_serverResultName;
		//! result names for KParts::ComponentFactory::ComponentLoadingError
		TQMap<int,TQString> m_componentLoadingErrors;

		TQStringList possibleProblems;

		bool lookupDriversNeeded : 1;

	friend class DriverManager;
};
}

#endif