File indexing completed on 2024-04-21 04:01:02

 /*
     This file is part of the syndication library
     SPDX-FileCopyrightText: 2006 Frank Osterfeld <osterfeld@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef SYNDICATION_RDF_NODE_H
 #define SYNDICATION_RDF_NODE_H
 
 #include "../syndication_export.h"
 
 #include <QSharedPointer>
 #include <QString>
 
 namespace Syndication
 {
 namespace RDF
 {
 class Model;
 class Node;
 class NodeVisitor;
 //@cond PRIVATE
 typedef QSharedPointer<Node> NodePtr;
 //@endcond
 
 /**
  * an RDF node, abstract baseclass for all RDF node types, like resources and
  * literals
  */
 class Node
 {
 public:
     /**
      * destructor
      */
     virtual ~Node();
 
     /**
      * Used by visitors for double dispatch. See NodeVisitor
      * for more information.
      * @param visitor the visitor calling the method
      * @param ptr a shared pointer object for this node
      */
     virtual void accept(NodeVisitor *visitor, NodePtr ptr);
 
     /**
      * returns a copy of the object. Must be implemented
      * by subclasses to return a copy using the concrete
      * type
      */
     virtual Node *clone() const = 0;
 
     /**
      * returns whether this node is a null node
      */
     virtual bool isNull() const = 0;
 
     /**
      * returns whether this node is a resource
      */
     virtual bool isResource() const = 0;
 
     /**
      * returns whether this node is a property
      */
     virtual bool isProperty() const = 0;
 
     /**
      * returns whether this node is a literal
      */
     virtual bool isLiteral() const = 0;
 
     /**
      * returns whether this node is an RDF sequence
      */
     virtual bool isSequence() const = 0;
 
     /**
      * returns whether this node is an anonymous resource
      */
     virtual bool isAnon() const = 0;
 
     /**
      * the identifier of this node. the ID is unique per model
      * and set by the associated model at creation time.
      */
     virtual unsigned int id() const = 0;
 
     /**
      * returns a textual representation of the node.
      * This is the literal string for literals, and a null string for other
      * node types.
      */
     virtual QString text() const = 0;
 
     /**
      * used in Model
      * @internal
      */
     virtual void setModel(const Model &model) = 0;
 
     /**
      *  used in Model
      * @internal
      */
     virtual void setId(unsigned int id) = 0;
 
 protected:
     /**
      * used to generate unique IDs for node objects
      */
     static unsigned int idCounter;
 };
 
 } // namespace RDF
 } // namespace Syndication
 
 #endif // SYNDICATION_RDF_NODE_H