Module org.apache.jena.core
Package org.apache.jena.rdf.model

Interface RDFNode

All Superinterfaces:
FrontsNode
All Known Subinterfaces:
AllDifferent, AllValuesFromRestriction, Alt, AnnotationProperty, Bag, BooleanClassDescription, CardinalityQRestriction, CardinalityRestriction, ComplementClass, Container, DataRange, DatatypeProperty, EnumeratedClass, FunctionalProperty, HasValueRestriction, Individual, IntersectionClass, InverseFunctionalProperty, Literal, MaxCardinalityQRestriction, MaxCardinalityRestriction, MinCardinalityQRestriction, MinCardinalityRestriction, ObjectProperty, OntClass, Ontology, OntProperty, OntResource, Property, QualifiedRestriction, RDFList, Resource, Restriction, Seq, SomeValuesFromRestriction, SymmetricProperty, TransitiveProperty, UnionClass
All Known Implementing Classes:
AllDifferentImpl, AllValuesFromRestrictionImpl, AltImpl, AnnotationPropertyImpl, BagImpl, BooleanClassDescriptionImpl, CardinalityQRestrictionImpl, CardinalityRestrictionImpl, ComplementClassImpl, ContainerImpl, DataRangeImpl, DatatypePropertyImpl, EnumeratedClassImpl, FunctionalPropertyImpl, HasValueRestrictionImpl, IndividualImpl, IntersectionClassImpl, InverseFunctionalPropertyImpl, LiteralImpl, MaxCardinalityQRestrictionImpl, MaxCardinalityRestrictionImpl, MinCardinalityQRestrictionImpl, MinCardinalityRestrictionImpl, ObjectPropertyImpl, OntClassImpl, OntologyImpl, OntPropertyImpl, OntResourceImpl, PropertyImpl, QualifiedRestrictionImpl, RDFListImpl, ResourceImpl, RestrictionImpl, SeqImpl, SomeValuesFromRestrictionImpl, SymmetricPropertyImpl, TransitivePropertyImpl, UnionClassImpl
public interface RDFNode extends FrontsNode
Interface covering RDF resources and literals. Allows probing whether a node is a literal/[blank, URI]resource, moving nodes from model to model, and viewing them as different Java types using the .as() polymorphism.

  • Method Summary

    Modifier and Type
    Method
    Description
    <T extends RDFNode>
    T
    as(Class<T> view)
    RDFNodes can be converted to different implementation types.
    Literal
    asLiteral()
    If this node is a Literal, answer that literal; otherwise throw an exception.
    Resource
    asResource()
    If this node is a Resource, answer that resource; otherwise throw an exception.
    <T extends RDFNode>
    boolean
    canAs(Class<T> view)
    Answer true iff this RDFNode can be viewed as an instance of view: that is, if it has already been viewed in this way, or if it has an attached model in which it has properties that permit it to be viewed in this way.
    Model
    getModel()
    Return the model associated with this resource.
    RDFNode
    inModel(Model m)
    Answer a .equals() version of this node, except that it's in the model m.
    boolean
    isAnon()
    Answer true iff this RDFNode is an anonymous resource.
    boolean
    isLiteral()
    Answer true iff this RDFNode is a literal resource.
    boolean
    isResource()
    Answer true iff this RDFNode is a URI resource or an anonymous resource or a statement term (ie is not a literal).
    boolean
    isStmtResource()
    Answer true iff this RDFNode is a resource representing an RDF-star triple term.
    boolean
    isURIResource()
    Answer true iff this RDFNode is an named resource.
    String
    toString()
    Answer a String representation of the node.
    Object
    visitWith(RDFVisitor rv)
    Apply the appropriate method of the visitor to this node's content and return the result.

    Methods inherited from interface org.apache.jena.graph.FrontsNode

    asNode

  • Method Details

    • toString

      String toString()
      Answer a String representation of the node. The form of the string depends on the type of the node and is intended for human consumption, not machine analysis.
      Overrides:
      toString in class Object

    • isAnon

      boolean isAnon()
      Answer true iff this RDFNode is an anonymous resource. Useful for one-off tests: see also visitWith() for making literal/anon/URI choices.

    • isLiteral

      boolean isLiteral()
      Answer true iff this RDFNode is a literal resource. Useful for one-off tests: see also visitWith() for making literal/anon/URI choices.

    • isURIResource

      boolean isURIResource()
      Answer true iff this RDFNode is an named resource. Useful for one-off tests: see also visitWith() for making literal/anon/URI choices.

    • isResource

      boolean isResource()
      Answer true iff this RDFNode is a URI resource or an anonymous resource or a statement term (ie is not a literal). Useful for one-off tests: see also visitWith() for making literal/anon/URI choices.

    • isStmtResource

      boolean isStmtResource()
      Answer true iff this RDFNode is a resource representing an RDF-star triple term.

    • as

      <T extends RDFNode> T as(Class<T> view)
      RDFNodes can be converted to different implementation types. Convert this RDFNode to a type supporting the viewinterface. The resulting RDFNode should be an instance of view and should have any internal invariants as specified.

      If the RDFNode has no Model attached, it can only be .as()ed to a type it (this particular RDFNOde) already has.

      If the RDFNode cannot be converted, an UnsupportedPolymorphism exception is thrown..

    • canAs

      <T extends RDFNode> boolean canAs(Class<T> view)
      Answer true iff this RDFNode can be viewed as an instance of view: that is, if it has already been viewed in this way, or if it has an attached model in which it has properties that permit it to be viewed in this way. If canAs returns true, as on the same view should deliver an instance of that class.

    • getModel

      Model getModel()
      Return the model associated with this resource. If the Resource was not created by a Model, the result may be null.
      Returns:
      The model associated with this resource.

    • inModel

      RDFNode inModel(Model m)
      Answer a .equals() version of this node, except that it's in the model m.
      Parameters:
      m - a model to move the node to
      Returns:
      this, if it's already in m (or no model), a copy in m otherwise

    • visitWith

      Object visitWith(RDFVisitor rv)
      Apply the appropriate method of the visitor to this node's content and return the result.
      Parameters:
      rv - an RDFVisitor with a method for URI/blank/literal nodes
      Returns:
      the result returned by the selected method

    • asResource

      Resource asResource()
      If this node is a Resource, answer that resource; otherwise throw an exception.

    • asLiteral

      Literal asLiteral()
      If this node is a Literal, answer that literal; otherwise throw an exception.