File indexing completed on 2024-04-28 15:34:25

 /*
     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_RESOURCE_H
 #define SYNDICATION_RDF_RESOURCE_H
 
 #include <syndication/rdf/node.h>
 
 class QString;
 
 template<class T>
 class QList;
 
 namespace Syndication
 {
 namespace RDF
 {
 class Model;
 class Property;
 typedef QSharedPointer<Property> PropertyPtr;
 class Resource;
 class Statement;
 typedef QSharedPointer<Statement> StatementPtr;
 
 typedef QSharedPointer<Resource> ResourcePtr;
 
 /**
  * Resources are the entities in the RDF graph.
  * In RSS, e.g. the feed channel itself and the items are
  * resources.
  */
 class SYNDICATION_EXPORT Resource : public Node
 {
     friend class Model;
 
 public:
     /**
      * creates a null resource
      */
     Resource();
 
     /**
      * copies a resource
      *
      * @param other the resource to copy
      */
     Resource(const Resource &other);
 
     /**
      * creates a resource with a given URI.
      * Do not use this directly, use Model::createResource() instead.
      *
      * @param uri the URI of the new resource
      */
     explicit Resource(const QString &uri);
 
     /**
      * destructor
      */
     ~Resource() override;
 
     /**
      * assigns a resource
      *
      * @param other the resource to assign
      */
     Resource &operator=(const Resource &other);
 
     /**
      * checks two resources for equality. Currently both URI (or anonID)
      * _and_ id() must be equal!
      *
      * @param other the node to compare this node to
      */
     bool operator==(const Node &other) const override;
 
     /**
      * 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
      */
     void accept(NodeVisitor *visitor, NodePtr ptr) override;
 
     /**
      * creates a copy of the resource object
      */
     Resource *clone() const override;
 
     /**
      * the model this resource belongs to
      */
     virtual Model model() const;
 
     /**
      * returns whether the resource has a property @p property in the
      * associated model.
      *
      * @param property the property to check for
      */
     virtual bool hasProperty(PropertyPtr property) const;
 
     /**
      * returns a statement from the associated model where this resource is
      * the subject and the given property the predicate.
      *
      * @param property the property to check for
      *
      * @return the first statement found that satisfies the conditions.
      * If there are multiple statements, an arbitrary one is returned.
      */
     virtual StatementPtr property(PropertyPtr property) const;
 
     /**
      * returns the list of all statements from the associated model where
      * this resource is the subject and the given property the predicate.
      *
      * @param property the property to check for
      *
      * @return a list of the statements that satisfy the conditions.
      */
     virtual QList<StatementPtr> properties(PropertyPtr property) const;
 
     /**
      * returns whether the resource is a null resource
      */
     bool isNull() const override;
 
     /**
      * the identifier of this node. the ID is unique per model
      * and set by the associated model at creation time.
      */
     unsigned int id() const override;
 
     /**
      * returns @p true
      */
     bool isResource() const override;
 
     /**
      * returns @p false
      */
     bool isLiteral() const override;
 
     /**
      * returns @p true if this resource is also a property, @p false
      * otherwise
      */
     bool isProperty() const override;
 
     /**
      * returns whether this resource is an anonymous resource
      */
     bool isAnon() const override;
 
     /**
      * returns @p true if this resource is also a sequence, @p false
      * otherwise.
      */
     bool isSequence() const override;
 
     /**
      * returns a null string
      */
     QString text() const override;
 
     /**
      * returns the URI of the resource
      */
     virtual QString uri() const;
 
     /**
      * used in Model
      * @internal
      */
     void setModel(const Model &model) override;
 
     /**
      * used in Model
      * @internal
      */
     void setId(unsigned int id) override;
 
 private:
     class ResourcePrivate;
     typedef QSharedPointer<ResourcePrivate> ResourcePrivatePtr;
     ResourcePrivatePtr d;
 };
 
 } // namespace RDF
 } // namespace Syndication
 
 #endif // SYNDICATION_RDF_RESOURCE_H