com.hp.hpl.jena.rdf.model
Interface Selector

All Known Implementing Classes:

SimpleSelector

public interface Selector

A Statement selector.

Model includes list and query methods which will return all the statements which are selected by a selector object. This is the interface of such selector objects.

Version:

Release='$Name: $' Revision='$Revision: 1.1 $' Date='$Date: 2009/06/29 08:55:38 $'

Author:

bwm, kers

Method Summary

RDFNode	getObject() Answer the only RDFNode object that this Selector will match, or null if it can match more than a single node.
Property	getPredicate() Answer the only predicate Property that this Selector will match, or null if it can match more than a single property.
Resource	getSubject() Answer the only subject Resource that this Selector will match, or null if it can match more that a single resource.
boolean	isSimple() Answer true iff this Selector is completely characterised by its subject, predicate, and object fields.
boolean	test(Statement s) Determine whether a Statement should be selected.

Method Detail

test

boolean test(Statement s)

Determine whether a Statement should be selected.

Parameters:

s - The statement to be considered.

Returns:

true if the statement has been selected.

isSimple

boolean isSimple()

Answer true iff this Selector is completely characterised by its subject, predicate, and object fields. If so, the test predicate need not be called to decide if a statement is acceptable. This allows query engines lattitude for optimisation (and our memory-based and RDB-based model implementations both exploit this licence).

getSubject

Resource getSubject()

Answer the only subject Resource that this Selector will match, or null if it can match more that a single resource.

getPredicate

Property getPredicate()

Answer the only predicate Property that this Selector will match, or null if it can match more than a single property.

getObject

RDFNode getObject()

Answer the only RDFNode object that this Selector will match, or null if it can match more than a single node.