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dbengine.h

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/*
   This file is part of the KDB libraries
   Copyright (c) 2000 Praduroux Alessandro <pradu@thekompany.com>

   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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/
#ifndef DBENGINE_H
#define DBENGINE_H

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <qlist.h>
#include <qstringlist.h>

#include <ktrader.h>

#include "object.h"
#include "plugin.h"
#include "connection.h"

class KConfigBase;

namespace KDB {

class Database;

class DBEngine : public Object{

    Q_OBJECT

 public:
    virtual ~DBEngine();

    static DBEngine *self();

    PluginIterator beginPlugins();

    Plugin * findPlugin(const QString &name);

    QStringList pluginNames();

    Connection * openConnection(const QString &pluginName, const QString &host, int port,
                                const QString &user, const QString &password = QString::null);

    Connection * openConnection(const QString &name);

    virtual Connection * addConnection (const QString &pluginName,
                                        const QString &host,
                                        int port = 0,
                                        const QString &user = QString::null,
                                        const QString &password = QString::null);

    void remove(Connection *);

    Connection * findConnection(const QString &plugin,
                                const QString &host,
                                const int port,
                                const QString &user);
    Connection * findConnection(const QString &name);

    ConnectionIterator beginConnections();

    void loadConnections(KConfigBase *config = 0L);

    void saveConnections(KConfigBase *config = 0L);

    Database * openDatabase(const QString &pluginName, const QString &host, int port,
                            const QString &user, const QString &password,
                            const QString &databaseName);

 protected:

    bool loadPlugin(const QString&);
    
 protected slots:

    void slotConnectionClosed(Connection *);
 
    void slotDeleteConnection();

 private:

    explicit DBEngine();
    static DBEngine * m_engine;

    KTrader::OfferList m_pluginData;
    PluginList  m_plugins;

    ConnectionList m_connections;
    Connection * m_connToDelete;
};

}
#define DBENGINE KDB::DBEngine::self()

#endif

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