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/**
* The class responsible for managing a backend.
* The implementation of this abstract class contains
* the complete database handling.
*
* Copyright (c) 2002 by Stefan Eilers (Eilers.Stefan@epost.de)
* Copyright (c) 2002 by Holger Freyther (zecke@handhelds.org)
*
* =====================================================================
* This program 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.
* =====================================================================
* ToDo: Define enum for query settings
* =====================================================================
* Version: $Id$
* =====================================================================
* History:
* $Log$
* Revision 1.6 2003/08/01 12:30:16 eilers
* Merging changes from BRANCH_1_0 to HEAD
*
* Revision 1.5.4.1 2003/06/30 14:34:19 eilers
* Patches from Zecke:
* Fixing and cleaning up extraMap handling
* Adding d_ptr for binary compatibility in the future
*
* Revision 1.5 2003/04/13 18:07:10 zecke
* More API doc
* QString -> const QString&
* QString = 0l -> QString::null
*
* Revision 1.4 2002/11/13 14:14:51 eilers
* Added sorted for Contacts..
*
* Revision 1.3 2002/11/01 15:10:42 eilers
* Added regExp-search in database for all fields in a contact.
*
* Revision 1.2 2002/10/07 17:34:24 eilers
* added OBackendFactory for advanced backend access
*
* Revision 1.1 2002/09/27 17:11:44 eilers
* Added API for accessing the Contact-Database ! It is compiling, but
* please do not expect that anything is working !
* I will debug that stuff in the next time ..
* Please read README_COMPILE for compiling !
*
* =====================================================================
*
*/
#ifndef _OCONTACTACCESSBACKEND_H_
#define _OCONTACTACCESSBACKEND_H_
#include "ocontact.h"
#include "opimaccessbackend.h"
#include <qregexp.h>
/**
* This class represents the interface of all Contact Backends.
* Derivates of this class will be used to access the contacts.
* As implementation currently XML and vCard exist. This class needs to be implemented
* if you want to provide your own storage.
* In all queries a list of uids is passed on instead of loading the actual record!
*
* @see OContactAccessBackend_VCard
* @see OContactAccessBackend_XML
*/
class OContactAccessBackend: public OPimAccessBackend<OContact> {
public:
OContactAccessBackend() {}
virtual ~OContactAccessBackend() {}
/**
* Return if database was changed externally.
* This may just make sense on file based databases like a XML-File.
* It is used to prevent to overwrite the current database content
* if the file was already changed by something else !
* If this happens, we have to reload before save our data.
* If we use real databases, this should be handled by the database
* management system themselve, therefore this function should always return false in
* this case. It is not our problem to handle this conflict ...
* @return <i>true</i> if the database was changed and if save without reload will
* be dangerous. <i>false</i> if the database was not changed or it is save to write
* in this situation.
*/
virtual bool wasChangedExternally() = 0;
virtual QArray<int> matchRegexp( const QRegExp &r ) const = 0;
/**
* Return all possible settings.
* @return All settings provided by the current backend
* (i.e.: query_WildCards & query_IgnoreCase)
*/
virtual const uint querySettings() = 0;
/**
* Check whether settings are correct.
* @return <i>true</i> if the given settings are correct and possible.
*/
virtual bool hasQuerySettings (uint querySettings) const = 0;
/**
* FIXME!!!
* Returns a sorted list of records either ascendinf or descending for a giving criteria and category
*/
virtual QArray<int> sorted( bool ascending, int sortOrder, int sortFilter, int cat ) = 0;
private:
class Private;
Private *d;
};
#endif
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