/*  -*- mode: C++; c-file-style: "gnu" -*-
 *
 *  This file is part of KMail, the KDE mail client.
 *  Copyright (c) 2003 Zack Rusin <zack@kde.org>
 *
 *  KMail is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License, version 2, as
 *  published by the Free Software Foundation.
 *
 *  KMail 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  In addition, as a special exception, the copyright holders give
 *  permission to link the code of this program with any edition of
 *  the Qt library by Trolltech AS, Norway (or with modified versions
 *  of Qt that use the same license as Qt), and distribute linked
 *  combinations including the two.  You must obey the GNU General
 *  Public License in all respects for all of the code used other than
 *  Qt.  If you modify this file, you may extend this exception to
 *  your version of the file, but you are not obligated to do so.  If
 *  you do not wish to do so, delete this exception statement from
 *  your version.
 */

#ifndef MAILCOMMON_FOLDERJOB_H
#define MAILCOMMON_FOLDERJOB_H

#include <kmime/kmime_message.h>
#include <QList>
#include <QString>
#include <akonadi/collection.h>

namespace MailCommon {

class FolderJob : public QObject
{
  Q_OBJECT

public:
  FolderJob();

  virtual ~FolderJob();

  /**
   * Start the job
   */
  void start();

  /**
   * Interrupt the job. Note that the finished() and result() signal
   * will be emitted, unless you called setPassiveDestructor(true) before.
   * This kills the job, don't use it afterwards.
   */
  virtual void kill();

  /**
   * @return the error code of the job. This must only be called from
   * the slot connected to the finished() signal.
   */
  int error() const { return mErrorCode; }

  /**
   * @return true if this job can be canceled, e.g. to exit the application
   */
  bool isCancellable() const { return mCancellable; }

  /**
   * Call this to change the "cancellable" property of this job.
   * By default, tListMessages, tGetMessage, tGetFolder and tCheckUidValidity
   * are cancellable, the others are not. But when copying, a non-cancellable
   * tGetMessage is needed.
   */
  void setCancellable( bool b ) { mCancellable = b; }

signals:
  /**
   * Emitted when the job finishes all processing.
   */
  void finished();

  /**
   * Emitted when the job finishes all processing.
   * More convenient signal than finished(), since it provides a pointer to the job.
   * This signal is emitted by the FolderJob destructor => do NOT downcast
   * the job to a subclass!
   */
  void result( FolderJob* job );

protected:
  /**
   * Has to be reimplemented. It's called by the start() method. Should
   * start the processing of the specified job function.
   */
  virtual void execute()=0;

  Akonadi::Collection mSrcFolder;
  int                 mErrorCode;

  bool                mStarted;
  bool                mCancellable;
};

}

#endif
