/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the QtSql module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#ifndef QSQLRELATIONALTABLEMODEL_H
#define QSQLRELATIONALTABLEMODEL_H

#include <QtSql/qsqltablemodel.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE


class Q_SQL_EXPORT QSqlRelation
{
public:
    QSqlRelation() {}
    QSqlRelation(const QString &aTableName, const QString &indexCol,
               const QString &displayCol)
        : tName(aTableName), iColumn(indexCol), dColumn(displayCol) {}
    inline QString tableName() const
    { return tName; }
    inline QString indexColumn() const
    { return iColumn; }
    inline QString displayColumn() const
    { return dColumn; }
    inline bool isValid() const
    { return !(tName.isEmpty() || iColumn.isEmpty() || dColumn.isEmpty()); }
private:
    QString tName, iColumn, dColumn;
};

class QSqlRelationalTableModelPrivate;

class Q_SQL_EXPORT QSqlRelationalTableModel: public QSqlTableModel
{
    Q_OBJECT

public:
    enum JoinMode {
        InnerJoin,
        LeftJoin
    };

    explicit QSqlRelationalTableModel(QObject *parent = 0,
                                      QSqlDatabase db = QSqlDatabase());
    virtual ~QSqlRelationalTableModel();

    QVariant data(const QModelIndex &item, int role = Qt::DisplayRole) const;
    bool setData(const QModelIndex &item, const QVariant &value, int role = Qt::EditRole);
    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex());

    void clear();
    bool select();

    void setTable(const QString &tableName);
    virtual void setRelation(int column, const QSqlRelation &relation);
    QSqlRelation relation(int column) const;
    virtual QSqlTableModel *relationModel(int column) const;
    void setJoinMode( QSqlRelationalTableModel::JoinMode joinMode );

public Q_SLOTS:
    void revertRow(int row);

protected:
    QString selectStatement() const;
    bool updateRowInTable(int row, const QSqlRecord &values);
    bool insertRowIntoTable(const QSqlRecord &values);
    QString orderByClause() const;

private:
    Q_DECLARE_PRIVATE(QSqlRelationalTableModel)
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSQLRELATIONALTABLEMODEL_H