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141 lines
3.8 KiB
C++
141 lines
3.8 KiB
C++
/*
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* This file is part of the syndication library
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*
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* Copyright (C) 2006 Frank Osterfeld <osterfeld@kde.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SYNDICATION_RDF_NODE_H
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#define SYNDICATION_RDF_NODE_H
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#include <QtCore/QString>
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#include <syndication/ksyndication_export.h>
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#include <boost/shared_ptr.hpp>
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namespace Syndication {
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namespace RDF {
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class Model;
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class Node;
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class NodeVisitor;
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//@cond PRIVATE
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typedef boost::shared_ptr<Node> NodePtr;
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//@endcond
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/**
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* an RDF node, abstract baseclass for all RDF node types, like resources and
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* literals
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*/
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class SYNDICATION_EXPORT Node
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{
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public:
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/**
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* destructor
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*/
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virtual ~Node();
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/**
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* Used by visitors for double dispatch. See NodeVisitor
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* for more information.
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* @param visitor the visitor calling the method
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* @param ptr a shared pointer object for this node
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*/
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virtual void accept(NodeVisitor* visitor, NodePtr ptr);
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/**
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* checks whether two nodes are equal. The meaning of equality
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* is defined per subclass (e.g. equality of URIs, IDs etc.)
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*
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* @param other the node to compare to
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*/
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virtual bool operator==(const Node& other) const = 0;
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/**
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* returns a copy of the object. Must be implemented
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* by subclasses to return a copy using the concrete
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* type
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*/
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virtual Node* clone() const = 0;
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/**
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* returns whether this node is a null node
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*/
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virtual bool isNull() const = 0;
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/**
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* returns whether this node is a resource
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*/
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virtual bool isResource() const = 0;
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/**
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* returns whether this node is a property
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*/
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virtual bool isProperty() const = 0;
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/**
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* returns whether this node is a literal
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*/
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virtual bool isLiteral() const = 0;
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/**
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* returns whether this node is an RDF sequence
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*/
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virtual bool isSequence() const = 0;
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/**
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* returns whether this node is an anonymous resource
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*/
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virtual bool isAnon() const = 0;
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/**
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* the identifier of this node. the ID is unique per model
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* and set by the associated model at creation time.
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*/
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virtual unsigned int id() const = 0;
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/**
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* returns a textual representation of the node.
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* This is the literal string for literals, and a null string for other
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* node types.
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*/
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virtual QString text() const = 0;
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/**
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* used in Model
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* @internal
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*/
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virtual void setModel(const Model& model) = 0;
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/**
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* used in Model
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* @internal
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*/
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virtual void setId(unsigned int id) = 0;
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protected:
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/**
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* used to generate unique IDs for node objects
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*/
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static unsigned int idCounter;
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};
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} // namespace RDF
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} // namespace Syndication
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#endif // SYNDICATION_RDF_NODE_H
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