Interface Triple

  • All Superinterfaces:
    Annotatable, Changeable, Term
    All Known Subinterfaces:
    ComparableTriple
    All Known Implementing Classes:
    SimpleComparableTriple, Triple.Impl

    public interface Triple
    extends Term
    A triple in an ontology. This is two terms and a relationship between them, similar to RDF and other similar logic systems.

    For documentation purposes, a Triple may provide a name. However, a Triple may also be named as "(subject, object, predicate)" if no specific name is provided.

    Since:
    1.4
    Author:
    Thomas Down, Matthew Pocock
    See Also:
    ComparableTriple
    • Method Detail

      • getSubject

        Term getSubject()
        Return the subject term of this triple
        Returns:
        the subject term
      • getObject

        Term getObject()
        Return the object term of this triple.
        Returns:
        the object term
      • getPredicate

        Term getPredicate()
        Return a Term which defines the type of relationship between the subject and object terms.
        Returns:
        the predicate
      • hashCode

        int hashCode()
        The hashcode for a Triple.

        This must be implemented as:

         return getSubject().hashCode() +
           31 * getObject().hashCode() +
           31 * 31 * getPredicate().hashCode();
         
        If you do not implement hashcode in this way then you have no guarantee that your Triple objects will be found in an ontology and that they will not be duplicated.

        Overrides:
        hashCode in class Object
      • equals

        boolean equals​(Object obj)
        Check to see if an object is an equivalent Triple.

        Two triples are equivalent if they have the same subject, object and predicate fields.

         if (! (o instanceof Triple)) {
             return false;
         }
         Triple to = (Triple) o;
         return to.getSubject() == getSubject() &&
                to.getObject() == getObject() &&
                to.getPredicate() == getPredicate();
         
        If you do not implement equals in this way then you have no guarantee that your Triple objects will be found in an ontology and that they will not be duplicated.

        Overrides:
        equals in class Object