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 Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with Classified Ads; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#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