org.apache.jena.sparql.engine.iterator

Class RX

java.lang.Object

org.apache.jena.sparql.engine.iterator.RX

public class RX
extends Object

Solver library for RDF*.

There are two entry points.

Function rdfStarTriple(org.apache.jena.sparql.engine.QueryIterator, org.apache.jena.graph.Triple, org.apache.jena.sparql.engine.ExecutionContext) for matching a single triple pattern in a basic graph pattern that may involve RDF* terms.

Function matchTripleStar(org.apache.jena.sparql.engine.QueryIterator, org.apache.jena.sparql.core.Var, org.apache.jena.graph.Triple, org.apache.jena.sparql.engine.ExecutionContext) for matches a triple term and assigning the triple matched to a variable. It is used within rdfStarTriple(org.apache.jena.sparql.engine.QueryIterator, org.apache.jena.graph.Triple, org.apache.jena.sparql.engine.ExecutionContext) for nested triple term and a temporary allocated variable as well can for FIND(<<...>> AS ?t).

Constructor Summary

Constructors

Constructor and Description
RX()

Method Summary

Modifier and Type	Method and Description
static QueryIterator	matchTripleStar(QueryIterator chain, Var var, Triple triple, ExecutionContext execCxt) Match a triple pattern (which may have nested triple terms in it).
static QueryIterator	rdfStarTriple(QueryIterator chain, Triple triple, ExecutionContext execCxt) Match a single triple pattern that may involve RDF* terms.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RX

public RX()

Method Detail

rdfStarTriple

public static QueryIterator rdfStarTriple(QueryIterator chain,
                                          Triple triple,
                                          ExecutionContext execCxt)

Match a single triple pattern that may involve RDF* terms. This is the top level function for matching triples. The function matchTripleStar(org.apache.jena.sparql.engine.QueryIterator, org.apache.jena.sparql.core.Var, org.apache.jena.graph.Triple, org.apache.jena.sparql.engine.ExecutionContext) matches a triple term and assigns the triple matched to a variable. It is used within rdfStarTriple(org.apache.jena.sparql.engine.QueryIterator, org.apache.jena.graph.Triple, org.apache.jena.sparql.engine.ExecutionContext) for nested triple term and a temporary allocated variable as well can for FIND(<<...>> AS ?t).

Implementation Note:

Without RDF*, this would be a plain call of matchData(org.apache.jena.sparql.engine.QueryIterator, org.apache.jena.graph.Triple, org.apache.jena.sparql.engine.ExecutionContext) which is simply:

 new QueryIterTriplePattern(chain, triple, execCxt)}
 

matchTripleStar

public static QueryIterator matchTripleStar(QueryIterator chain,
                                            Var var,
                                            Triple triple,
                                            ExecutionContext execCxt)

Match a triple pattern (which may have nested triple terms in it). Any matched triples are added as triple terms bound to the supplied variable.