Module org.apache.jena.core
Package org.apache.jena.enhanced

Class EnhNode

java.lang.Object
org.apache.jena.enhanced.Polymorphic<RDFNode>
org.apache.jena.enhanced.EnhNode
All Implemented Interfaces:
FrontsNode
Direct Known Subclasses:
LiteralImpl, ResourceImpl
public class EnhNode extends Polymorphic<RDFNode> implements FrontsNode

A specialisation of Polymorphic that models an extended node in a an extended graph. An extended node wraps a normal node, and adds additional convenience access or user affordances, though the state remains in the graph itself.

  • Constructor Summary

    Constructors
    Constructor
    Description
    EnhNode(Node n, EnhGraph g)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    <T extends RDFNode>
    T
    as(Class<T> t)
    allow subclasses to implement RDFNode & its subinterface
    Node
    asNode()
    Answer the graph node that this enhanced node wraps
    <X extends RDFNode>
    boolean
    canAs(Class<X> t)
    API-level method for polymorphic testing
    final boolean
    equals(Object o)
    An enhanced node is equal to another enhanced node n iff the underlying nodes are equal.
    EnhGraph
    getGraph()
    Answer the graph containing this node
    final int
    hashCode()
    The hash code of an enhanced node is defined to be the same as the underlying node.
    final boolean
    isAnon()
    An enhanced node is Anon[ymous] iff its underlying node is Blank.
    final boolean
    isLiteral()
    An enhanced node is Literal iff its underlying node is too.
    final boolean
    isResource()
    An enhanced node is a resource if it's node is a URI node, a blank node or a triple term.
    final boolean
    isStmtResource()
    An enhanced node is a statement resource iff its underlying node is a triple term (RDF-star).
    final boolean
    isURIResource()
    An enhanced node is a URI resource iff its underlying node is too.
    boolean
    isValid()
    answer true iff this enhanced node is still underpinned in the graph by triples appropriate to its type.
    <X extends RDFNode>
    X
    viewAs(Class<X> t)
    Answer a facet of this node, where that facet is denoted by the given type.

    Methods inherited from class org.apache.jena.enhanced.Polymorphic

    addView, supports

    Methods inherited from class java.lang.Object

    getClass, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

  • Method Details

    • asNode

      public Node asNode()
      Answer the graph node that this enhanced node wraps
      Specified by:
      asNode in interface FrontsNode
      Returns:
      A plain node

    • getGraph

      public EnhGraph getGraph()
      Answer the graph containing this node
      Returns:
      An enhanced graph

    • isAnon

      public final boolean isAnon()
      An enhanced node is Anon[ymous] iff its underlying node is Blank.

    • isLiteral

      public final boolean isLiteral()
      An enhanced node is Literal iff its underlying node is too.

    • isURIResource

      public final boolean isURIResource()
      An enhanced node is a URI resource iff its underlying node is too.

    • isStmtResource

      public final boolean isStmtResource()
      An enhanced node is a statement resource iff its underlying node is a triple term (RDF-star).

    • isResource

      public final boolean isResource()
      An enhanced node is a resource if it's node is a URI node, a blank node or a triple term.

    • viewAs

      public <X extends RDFNode> X viewAs(Class<X> t)
      Answer a facet of this node, where that facet is denoted by the given type.
      Parameters:
      t - A type denoting the desired facet of the underlying node
      Returns:
      An enhanced nodet that corresponds to t; this may be this Java object, or a different object.

    • as

      public <T extends RDFNode> T as(Class<T> t)
      allow subclasses to implement RDFNode & its subinterface

    • canAs

      public <X extends RDFNode> boolean canAs(Class<X> t)
      API-level method for polymorphic testing

    • hashCode

      public final int hashCode()
      The hash code of an enhanced node is defined to be the same as the underlying node.
      Overrides:
      hashCode in class Object
      Returns:
      The hashcode as an int

    • equals

      public final boolean equals(Object o)
      An enhanced node is equal to another enhanced node n iff the underlying nodes are equal. We generalise to allow the other object to be any class implementing asNode, because we allow other implemementations of Resource than EnhNodes, at least in principle. This is deemed to be a complete and correct interpretation of enhanced node equality, which is why this method has been marked final.
      Specified by:
      equals in class Polymorphic<RDFNode>
      Parameters:
      o - An object to test for equality with this node
      Returns:
      True if o is equal to this node.

    • isValid

      public boolean isValid()
      Description copied from class: Polymorphic
      answer true iff this enhanced node is still underpinned in the graph by triples appropriate to its type.
      Specified by:
      isValid in class Polymorphic<RDFNode>