// @SuppressWarnings("null")
// @Override
@Override
protected ExtendedIterator<Triple> graphBaseFind(TripleMatch m) {
Node s = m.getMatchSubject();
Var sVar = null;
if (s == null) {
sVar = Var.alloc("s");
s = sVar;
}
Node p = m.getMatchPredicate();
Var pVar = null;
if (p == null) {
pVar = Var.alloc("p");
p = pVar;
}
Node o = m.getMatchObject();
Var oVar = null;
if (o == null) {
oVar = Var.alloc("o");
o = oVar;
}
Triple triple = new Triple(s, p, o);
// Evaluate as an algebra expression
BasicPattern pattern = new BasicPattern();
pattern.add(triple);
Op op = new OpBGP(pattern);
// // Make remote execution object.
// System.err.println("GraphSPARQLService.graphBaseFind: Unimplemented : remote service
// execution") ;
// //Plan plan = factory.create(op, getDataset(), BindingRoot.create(), null) ;
//
// QueryIterator qIter = plan.iterator() ;
// List<Triple> triples = new ArrayList<Triple>() ;
//
//
// for (; qIter.hasNext() ; )
// {
// Binding b = qIter.nextBinding() ;
// Node sResult = s ;
// Node pResult = p ;
// Node oResult = o ;
// if ( sVar != null )
// sResult = b.get(sVar) ;
// if ( pVar != null )
// pResult = b.get(pVar) ;
// if ( oVar != null )
// oResult = b.get(oVar) ;
// Triple resultTriple = new Triple(sResult, pResult, oResult) ;
// if ( log.isDebugEnabled() )
// log.debug(" "+resultTriple) ;
// triples.add(resultTriple) ;
// }
// qIter.close() ;
// return WrappedIterator.createNoRemove(triples.iterator()) ;
return null;
}
/**
* Takes a concept and adds
*
* @return
*/
public static Concept createPropertyQuery(Concept concept) {
Collection<Var> vars = PatternVars.vars(concept.getElement());
List<String> varNames = VarUtils.getVarNames(vars);
Var s = concept.getVar();
Generator gen = GeneratorBlacklist.create("v", varNames);
Var p = Var.alloc(gen.next());
Var o = Var.alloc(gen.next());
Triple triple = new Triple(s, p, o);
BasicPattern bp = new BasicPattern();
bp.add(triple);
List<Element> elements;
if (concept.isSubjectConcept()) {
elements = new ArrayList<Element>();
} else {
elements = concept.getElements();
}
elements.add(new ElementTriplesBlock(bp));
Concept result = new Concept(elements, p);
return result;
}
@Override
public Op transform(OpQuadPattern quadPattern) {
Node gNode = quadPattern.getGraphNode();
Node g = substitute(gNode, binding);
BasicPattern triples = new BasicPattern();
for (Triple triple : quadPattern.getBasicPattern()) {
Node s = substitute(triple.getSubject(), binding);
Node p = substitute(triple.getPredicate(), binding);
Node o = substitute(triple.getObject(), binding);
Triple t = new Triple(s, p, o);
triples.add(t);
}
// Pure quading.
// for ( Iterator iter = quadPattern.getQuads().iterator() ;
// iter.hasNext() ; )
// {
// Quad quad = (Quad)iter.next() ;
// if ( ! quad.getGraph().equals(gNode) )
// throw new
// ARQInternalErrorException("Internal error: quads block is not uniform over the graph node")
// ;
// Node s = substitute(quad.getSubject(), binding) ;
// Node p = substitute(quad.getPredicate(), binding) ;
// Node o = substitute(quad.getObject(), binding) ;
// Triple t = new Triple(s, p, o) ;
// triples.add(t) ;
// }
return new OpQuadPattern(g, triples);
}
/**
* Puts binding values to the appripriate places in the given BGP, and also adds indexes to
* variable names.
*
* @param bgp
* @param binding
* @param index
* @return
*/
public static BasicPattern substitute(BasicPattern bgp, Binding binding, int index) {
if (isNotNeeded(binding)) return bgp;
BasicPattern bgp2 = new BasicPattern();
// BGP deki tüm triple lar dolaşılıyor yerine koymak adına
for (Triple triple : bgp) {
// Binding listteki bindingler de UNION lanmak için dolaşılıyor.
Triple t = substitute(triple, binding, index);
bgp2.add(t);
}
return bgp2;
}
/**
* Return a new basic pattern with the same triples as the input, but ordered as per the index
* list of this reorder processor.
*/
@Override
public BasicPattern reorder(BasicPattern bgp) {
if (indexes.length != bgp.size()) {
String str =
String.format(
"Expected size = %d : actual basic pattern size = %d", indexes.length, bgp.size());
Log.fatal(this, str);
throw new ARQException(str);
}
BasicPattern bgp2 = new BasicPattern();
for (int j = 0; j < indexes.length; j++) {
int idx = indexes[j];
Triple t = bgp.get(idx);
bgp2.add(t);
}
return bgp2;
}