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/*
* Copyright (c) 2003, 2004 Michael Pyne <michael.pyne@kdemail.net>
*
* This software is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This software 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 library; see the file COPYING.
* If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef _BBASE_H
#define _BBASE_H
#include <ksharedptr.h>
class TQIODevice;
/**
* Abstract base class for the b-encoded types. Re-implemented
* by BInt, BList, BDict, and BString. Derive from this class in
* order to make a new type for the b-encoding suite. Classes
* derived from this one should not throw exceptions. Instead,
* they should implement isValid(), and allow calling modules to
* check error status that way.
*
* @author Michael Pyne <mpyne@grammarian.homelinux.net>
* @see BInt, BList, BDict, BString, TDESharedPtr
*/
// Derive from TDEShared to enable use of TDESharedPtr.
class BBase : public TDEShared
{
public:
/**
* Identifies the particular class that has been instantiated. All
* subclasses of this class should have an identifier here.
*/
enum classID {
bBase, /**< This class is BBase. No subclass should return this. */
bString, /**< This class is a BString. */
bInt, /**< This class is a BInt. */
bList, /**< This class is a BList. */
bDict /**< This class is a BDict. (Dictionary/Map) */
};
/**
* Returns the type identification of the object. It will
* be a value in the classID enum. A subclass of this class
* must implement this function.
*
* @return type identifier of the class
* @see classID
*/
virtual classID type_id() const = 0;
/**
* Destructor for the class. This function must be reimplemented
* in subclasses.
*/
virtual ~BBase () { ; }
/**
* Returns the validity status of the object. Newly constructed
* objects are invalid unless the initialization sequence completed
* successfully.
*
* @return the validity status of the object
*/
virtual bool isValid() const = 0;
/**
* Outputs the b-encoded representation of the object to the given
* TQIODevice.
* @param device the TQIODevice to write to
* @return true on a successful write, false otherwise
*/
virtual bool writeToDevice (TQIODevice &device) = 0;
};
#endif /* _BBASE_H */
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