Extension.h

00001 /*
00002 
00003 Copyright (C) 2005-2007 by Peter Dimov.
00004 
00005 This file is part of Calitko (http://www.calitko.org).
00006 
00007 Calitko is free software; you can redistribute it and/or modify
00008 it under the terms of the GNU General Public License as published by
00009 the Free Software Foundation; either version 2 of the License, or
00010 (at your option) any later version.
00011 
00012 Calitko is distributed in the hope that it will be useful,
00013 but WITHOUT ANY WARRANTY; without even the implied warranty of
00014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015 GNU General Public License for more details.
00016 
00017 You should have received a copy of the GNU General Public License
00018 along with Calitko; if not, write to the Free Software
00019 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00020 
00021 */
00022 
00023 #ifndef EXTENSION_H
00024 #define EXTENSION_H
00025 
00026 // Open containing namespaces:
00027 namespace Gnutella {
00028 namespace Packets {
00029 namespace Extensions {
00031 
00033 
00037 class Extension
00038 {
00039 public:
00040     virtual                     ~Extension()                {}
00041     virtual Extension *         copy() const = 0;
00042 
00043     bool                        isValid() const             { return isValid_; }
00044 
00045     virtual int                 prepareRead (const QByteArray &rawData) = 0;
00046     virtual void                read (QDataStream &stream) = 0;
00047     virtual int                 prepareWrite() const = 0;
00048     virtual void                write (QDataStream &stream) const = 0;
00049 
00050 protected:
00051                                 Extension() : isValid_ (true) {}
00052     void                        setIsValid (bool isValid)   { isValid_ = isValid; }
00053 
00054 private:
00055     bool                        isValid_;
00056 };
00057 
00058 // Close containing namespaces:
00059 } // namespace Extensions
00060 } // namespace Packets
00061 } // namespace Gnutella
00063 
00064 #endif // EXTENSION_H