org.apache.commons.rdf.api

Interface QuadLike<G extends RDFTerm>

All Superinterfaces:

TripleLike

All Known Subinterfaces:

JenaGeneralizedQuadLike, JenaQuad, JenaQuadLike<G>, JsonLdQuad, JsonLdQuadLike<G>, Quad, RDF4JQuad

public interface QuadLike<G extends RDFTerm>
extends TripleLike

A generalised "quad-like" interface, extended by Quad.

A QuadLike statement has at least a TripleLike.getSubject(), TripleLike.getPredicate(), TripleLike.getObject() and getGraphName(), but unlike a Quad does not have a formalised Quad.equals(Object) or Quad.hashCode() semantics and is not required to be immutable or thread-safe. This interface can also be used for generalised quads (e.g. a BlankNode as predicate).

Implementations should specialise which specific RDFTerm types they return by overriding TripleLike.getSubject(), TripleLike.getPredicate(), TripleLike.getObject() and getGraphName().

Since:

0.3.0-incubating

See Also:

Quad

Method Summary

Modifier and Type	Method and Description
Optional<G>	getGraphName() The graph name (graph label) of this statement, if present.

Methods inherited from interface org.apache.commons.rdf.api.TripleLike

getObject, getPredicate, getSubject

Method Detail

getGraphName

Optional<G> getGraphName()

The graph name (graph label) of this statement, if present.

If Optional.isPresent(), then the Optional.get() indicate the graph name of this statement. If the graph name is not present,e.g. the value is Optional.empty(), it indicates that this Quad is in the default graph.

Returns:

If Optional.isPresent(), the graph name of this quad, otherwise Optional.empty(), indicating the default graph. The graph name is typically an IRI or BlankNode.