/*
    This file is part of libkabc.
    Copyright (c) 2001 Cornelius Schumacher <schumacher@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 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 KABC_TIMEZONE_H
#define KABC_TIMEZONE_H

#include <qstring.h>

namespace KABC {

/**
 * @short Time zone information.
 * 
 * This class stores information about a time zone.
 */
class TimeZone
{
  friend QDataStream &operator<<( QDataStream &, const TimeZone & );
  friend QDataStream &operator>>( QDataStream &, TimeZone & );

public:

  /**
   * Construct invalid time zone.
   */
  TimeZone();

  /**
   * Construct time zone.
   * 
   * @param offset Offset in minutes relative to UTC.
   */
  TimeZone( int offset );
    
  /**
   * Set time zone offset relative to UTC.
   *   
   * @param offset Offset in minutes.
   */
  void setOffset( int );

  /**
   * Return offset in minutes relative to UTC.
   */
  int offset() const;

  /**
   * Return, if this time zone object is valid.
   */
  bool isValid() const;
    
  bool operator==( const TimeZone & ) const;
  bool operator!=( const TimeZone & ) const;
    
  /**
   * Return string representation of time zone offset.
   */
  QString asString() const;
    
private:
  int mOffset;  // Offset in minutes

  bool mValid;
};

QDataStream &operator<<( QDataStream &, const TimeZone & );
QDataStream &operator>>( QDataStream &, TimeZone & );

}
#endif
