datamodelbase.h

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/*    -*-C++-*- -*-coding: utf-8-unix;-*-
      Classified Ads is Copyright (c) Antti Jarvinen 2013.

      This file is part of Classified Ads.

      Classified Ads is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.

      Classified Ads 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 General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with Classified Ads.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef CLASSIFIED_DATAMODEL_BASE_H
#define CLASSIFIED_DATAMODEL_BASE_H
#include <QSqlDatabase>
#include <QObject>
#include "../mcontroller.h" // because enum from there is needed

class QSqlDatabase ;
class QMutex ;
class Hash ;
class ContentEncryptionModel ;

class ModelBase : public QObject {
  Q_OBJECT

public:
  ModelBase(QString aDataTableName,
        unsigned aMaxRowsToKeep ) ;
  ~ModelBase() ;
  bool setTimeLastReference(const Hash& aObjectFingerPrint,
                quint32 aTimeWhenLastReferenced) ; 
  unsigned getMaxRowsToKeep() ;
  void setMaxRowsToKeep(unsigned aRows)  ;
  void truncateDataTableToMaxRows(void)  ;
  void updateDbTableRowCount() ; 
signals:
  void error(MController::CAErrorSituation aError,
             const QString& aExplanation) ;

private: // methods
  virtual bool deleteOldestDataRowInTable() ;
protected:
  QString iDataTableName ; 
  unsigned iMaxRowsToKeep ; 
  unsigned iCurrentDbTableRowCount ; 
} ;
#endif