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90 lines
2.9 KiB
90 lines
2.9 KiB
/*
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* Copyright (c) 2003, 2004 Michael Pyne <michael.pyne@kdemail.net>
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*
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* This software is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; see the file COPYING.
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* If not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _BBASE_H
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#define _BBASE_H
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#include <ksharedptr.h>
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class TQIODevice;
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/**
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* Abstract base class for the b-encoded types. Re-implemented
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* by BInt, BList, BDict, and BString. Derive from this class in
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* order to make a new type for the b-encoding suite. Classes
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* derived from this one should not throw exceptions. Instead,
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* they should implement isValid(), and allow calling modules to
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* check error status that way.
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*
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* @author Michael Pyne <mpyne@grammarian.homelinux.net>
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* @see BInt, BList, BDict, BString, TDESharedPtr
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*/
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// Derive from TDEShared to enable use of TDESharedPtr.
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class BBase : public TDEShared
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{
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public:
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/**
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* Identifies the particular class that has been instantiated. All
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* subclasses of this class should have an identifier here.
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*/
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enum classID {
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bBase, /**< This class is BBase. No subclass should return this. */
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bString, /**< This class is a BString. */
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bInt, /**< This class is a BInt. */
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bList, /**< This class is a BList. */
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bDict /**< This class is a BDict. (Dictionary/Map) */
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};
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/**
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* Returns the type identification of the object. It will
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* be a value in the classID enum. A subclass of this class
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* must implement this function.
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*
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* @return type identifier of the class
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* @see classID
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*/
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virtual classID type_id() const = 0;
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/**
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* Destructor for the class. This function must be reimplemented
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* in subclasses.
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*/
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virtual ~BBase () { ; }
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/**
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* Returns the validity status of the object. Newly constructed
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* objects are invalid unless the initialization sequence completed
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* successfully.
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*
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* @return the validity status of the object
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*/
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virtual bool isValid() const = 0;
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/**
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* Outputs the b-encoded representation of the object to the given
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* TQIODevice.
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* @param device the TQIODevice to write to
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* @return true on a successful write, false otherwise
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*/
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virtual bool writeToDevice (TQIODevice &device) = 0;
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};
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#endif /* _BBASE_H */
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