// -*- c++ -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (c) 2001 Waldo Bastian <bastian@kde.org>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  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., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/

#ifndef KIO_SLAVE_CONFIG_H
#define KIO_SLAVE_CONFIG_H

#include <QtCore/QObject>
#include "kiocore_export.h"
#include "metadata.h"

namespace KIO
{

class SlaveConfigPrivate;
/**
 * SlaveConfig
 *
 * This class manages the configuration for io-slaves based on protocol
 * and host. The Scheduler makes use of this class to configure the slave
 * whenever it has to connect to a new host.
 *
 * You only need to use this class if you want to override specific
 * configuration items of an io-slave when the io-slave is used by
 * your application.
 *
 * Normally io-slaves are being configured by "kio_<protocol>rc"
 * configuration files. Groups defined in such files are treated as host
 * or domain specification. Configuration items defined in a group are
 * only applied when the slave is connecting with a host that matches with
 * the host and/or domain specified by the group.
 */
class KIOCORE_EXPORT SlaveConfig : public QObject
{
    Q_OBJECT
public:
    static SlaveConfig *self();
    ~SlaveConfig();
    /**
     * Configure slaves of type @p protocol by setting @p key to @p value.
     * If @p host is specified the configuration only applies when dealing
     * with @p host.
     *
     * Changes made to the slave configuration only apply to slaves
     * used by the current process.
     */
    void setConfigData(const QString &protocol, const QString &host, const QString &key, const QString &value);

    /**
     * Configure slaves of type @p protocol with @p config.
     * If @p host is specified the configuration only applies when dealing
     * with @p host.
     *
     * Changes made to the slave configuration only apply to slaves
     * used by the current process.
     */
    void setConfigData(const QString &protocol, const QString &host, const MetaData &config);

    /**
     * Query slave configuration for slaves of type @p protocol when
     * dealing with @p host.
     */
    MetaData configData(const QString &protocol, const QString &host);

    /**
     * Query a specific configuration key for slaves of type @p protocol when
     * dealing with @p host.
     */
    QString configData(const QString &protocol, const QString &host, const QString &key);

    /**
     * Undo any changes made by calls to setConfigData.
     */
    void reset();
Q_SIGNALS:
    /**
     * This signal is raised when a slave of type @p protocol deals
     * with @p host for the first time.
     *
     * Your application can use this signal to make some last minute
     * configuration changes with setConfigData based on the
     * host.
     */
    void configNeeded(const QString &protocol, const QString &host);
protected:
    SlaveConfig();
private:
    SlaveConfigPrivate *const d;
    friend class SlaveConfigSingleton;
};
}

#endif
