private RDFRectangle toRectangle(StatementPattern pattern, BindingSet bindings) { Value sVal = pattern.getSubjectVar().getValue(); Value pVal = pattern.getPredicateVar().getValue(); Value oVal = pattern.getObjectVar().getValue(); RDFURIRange subjectRange; List<String> list = new ArrayList<String>(); if (sVal == null) { if (bindings.hasBinding(pattern.getSubjectVar().getName())) list.add(bindings.getValue(pattern.getSubjectVar().getName()).stringValue()); } else list.add(sVal.stringValue()); if (!list.isEmpty()) subjectRange = new RDFURIRange(list); else subjectRange = new RDFURIRange(); ExplicitSetRange<URI> predicateRange; Set<URI> set = new HashSet<URI>(); if (pVal == null) { if (bindings.hasBinding(pattern.getPredicateVar().getName())) set.add((URI) bindings.getValue(pattern.getPredicateVar().getName())); } else set.add((URI) pVal); if (!set.isEmpty()) predicateRange = new ExplicitSetRange<URI>(set); else predicateRange = new ExplicitSetRange<>(); RDFValueRange objectRange = new RDFValueRange(); if (oVal == null) { if (bindings.hasBinding(pattern.getObjectVar().getName())) objectRange = fillObjectRange(bindings.getValue(pattern.getObjectVar().getName())); } else objectRange = fillObjectRange(oVal); return new RDFRectangle(subjectRange, predicateRange, objectRange); }