Package org.apache.jena.graph

Class Triple

  • All Implemented Interfaces:
    java.io.Serializable
    public class Triple
extends java.lang.Object
implements java.io.Serializable
    Triples are the basis for RDF statements; they have a subject, predicate, and object field (all nodes) and express the notion that the relationship named by the predicate holds between the subject and the object.
    See Also:
    Serialized Form

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static class  Triple.Field
      A Field is a selector from Triples; it allows selectors to be passed around as if they were functions, hooray.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static Triple ANY
      A Triple that is wildcarded in all fields.

    • Constructor Summary

      Constructors 
      Constructor Description
      Triple​(Node s, Node p, Node o)  

    • Field Detail

      • ANY

        public static final Triple ANY
        A Triple that is wildcarded in all fields.

    • Constructor Detail

    • Method Detail

      • toString

        public java.lang.String toString()
        return a human-readable string "subject @predicate object" describing the triple
        Overrides:
        toString in class java.lang.Object

      • toString

        public java.lang.String toString​(PrefixMapping pm)

      • getSubject

        public final Node getSubject()
        Returns:
        the subject of the triple

      • getPredicate

        public final Node getPredicate()
        Returns:
        the predicate of the triple

      • getObject

        public final Node getObject()
        Returns:
        the object of the triple

      • getMatchSubject

        public Node getMatchSubject()
        Return subject or null, not Node.ANY

      • getMatchPredicate

        public Node getMatchPredicate()
        Return predicate or null, not Node.ANY

      • getMatchObject

        public Node getMatchObject()
        Return object or null, not Node.ANY

      • isConcrete

        public boolean isConcrete()

      • equals

        public boolean equals​(java.lang.Object o)
        Answer true if o is a Triple with the same subject, predicate, and object as this triple.
        Overrides:
        equals in class java.lang.Object

      • sameAs

        public boolean sameAs​(Node s,
                      Node p,
                      Node o)
        Answer true iff this triple has subject s, predicate p, and object o.

      • matches

        public boolean matches​(Triple other)
        Does this triple, used as a pattern match, the other triple (usually a ground triple)

      • matches

        public boolean matches​(Node s,
                       Node p,
                       Node o)

      • subjectMatches

        public boolean subjectMatches​(Node s)

      • predicateMatches

        public boolean predicateMatches​(Node p)

      • objectMatches

        public boolean objectMatches​(Node o)

      • hashCode

        public int hashCode()
        The hash-code of a triple is the hash-codes of its components munged together: see hashCode(S, P, O).
        Overrides:
        hashCode in class java.lang.Object

      • hashCode

        public static int hashCode​(Node s,
                           Node p,
                           Node o)
        Return the munged hashCodes of the specified nodes, an exclusive-or of the slightly-shifted component hashcodes; this means (almost) all of the bits count, and the order matters, so (S @P O) has a different hash from (O @P S), etc.