@Override
protected void meetSP(StatementPattern node) throws Exception {
StatementPattern sp = node.clone();
final Var predVar = sp.getPredicateVar();
URI pred = (URI) predVar.getValue();
String predNamespace = pred.getNamespace();
final Var objVar = sp.getObjectVar();
final Var cntxtVar = sp.getContextVar();
if (objVar != null
&& !RDF.NAMESPACE.equals(predNamespace)
&& !SESAME.NAMESPACE.equals(predNamespace)
&& !RDFS.NAMESPACE.equals(predNamespace)
&& !EXPANDED.equals(cntxtVar)) {
URI transPropUri = (URI) predVar.getValue();
if (inferenceEngine.isTransitiveProperty(transPropUri)) {
node.replaceWith(
new TransitivePropertySP(
sp.getSubjectVar(), sp.getPredicateVar(), sp.getObjectVar(), sp.getContextVar()));
}
}
}
protected List<QueryBindingSet> populateBindingSet(
List<Statement> document, Var subjVar, List<Map.Entry<Var, Var>> predObjVar) {
// convert document to a multimap
Multimap<URI, Statement> docMap = ArrayListMultimap.create();
for (Statement st : document) {
docMap.put(st.getPredicate(), st);
}
List<QueryBindingSet> results = new ArrayList<QueryBindingSet>();
QueryBindingSet bs0 = new QueryBindingSet(bindings);
// QueryBindingSet result = new QueryBindingSet(bindings);
if (document.size() > 0) {
Statement stmt = document.get(0);
if (subjVar != null && !bs0.hasBinding(subjVar.getName())) {
bs0.addBinding(subjVar.getName(), stmt.getSubject());
}
}
results.add(bs0);
// for (Statement st : document) {
for (Map.Entry<Var, Var> entry : predObjVar) {
Var predVar = entry.getKey();
Var objVar = entry.getValue();
// if (predVar.hasValue() && !st.getPredicate().equals(predVar.getValue()))
// continue;
if (predVar == null || !predVar.hasValue()) continue;
Collection<Statement> predSts = docMap.get((URI) predVar.getValue());
// if (predVar != null && !result.hasBinding(predVar.getName()))
// result.addBinding(predVar.getName(), st.getPredicate());
// if (objVar != null && !result.hasBinding(objVar.getName()))
// result.addBinding(objVar.getName(), st.getObject());
populateBindingSets(results, predVar, objVar, predSts);
}
// }
return results;
}
/**
* Provides a string representation of an SP which contains info about whether each component
* (subj, pred, obj) is constant and its data and data type if it is constant.
*
* @param sp - The statement pattern to convert. (not null)
* @return A String representation of the statement pattern that may be used to do triple
* matching.
*/
public static String toStatementPatternString(final StatementPattern sp) {
checkNotNull(sp);
final Var subjVar = sp.getSubjectVar();
String subj = subjVar.getName();
if (subjVar.isConstant()) {
subj = subj + TYPE_DELIM + URI_TYPE;
}
final Var predVar = sp.getPredicateVar();
String pred = predVar.getName();
if (predVar.isConstant()) {
pred = pred + TYPE_DELIM + URI_TYPE;
}
final Var objVar = sp.getObjectVar();
String obj = objVar.getName();
if (objVar.isConstant()) {
final RyaType rt = RdfToRyaConversions.convertValue(objVar.getValue());
obj = obj + TYPE_DELIM + rt.getDataType().stringValue();
}
return subj + DELIM + pred + DELIM + obj;
}
private Value getConstantValue(Var var) {
return (var != null) ? var.getValue() : null;
}
private TupleExpr buildConstructor(
TupleExpr bodyExpr,
TupleExpr constructExpr,
boolean explicitConstructor,
boolean distinct,
boolean reduced) {
TupleExpr result = bodyExpr;
// Retrieve all StatementPattern's from the construct expression
List<StatementPattern> statementPatterns = StatementPatternCollector.process(constructExpr);
Set<Var> constructVars = getConstructVars(statementPatterns);
// Note: duplicate elimination is a two-step process. The first step
// removes duplicates from the set of constructor variables. After this
// step, any bnodes that need to be generated are added to each solution
// and these solutions are projected to subject-predicate-object
// bindings.
// Finally, the spo-bindings are again filtered for duplicates.
if (distinct || reduced) {
// Create projection that removes all bindings that are not used in
// the
// constructor
ProjectionElemList projElemList = new ProjectionElemList();
for (Var var : constructVars) {
// Ignore anonymous and constant vars, these will be handled
// after
// the distinct
if (!var.isAnonymous() && !var.hasValue()) {
projElemList.addElement(new ProjectionElem(var.getName()));
}
}
result = new Projection(result, projElemList);
// Filter the duplicates from these projected bindings
if (distinct) {
result = new Distinct(result);
} else {
result = new Reduced(result);
}
}
// Create BNodeGenerator's for all anonymous variables
Map<Var, ExtensionElem> extElemMap = new HashMap<Var, ExtensionElem>();
for (Var var : constructVars) {
if (var.isAnonymous() && !extElemMap.containsKey(var)) {
ValueExpr valueExpr = null;
if (var.hasValue()) {
valueExpr = new ValueConstant(var.getValue());
} else if (explicitConstructor) {
// only generate bnodes in case of an explicit constructor
valueExpr = new BNodeGenerator();
}
if (valueExpr != null) {
extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
}
}
}
if (!extElemMap.isEmpty()) {
result = new Extension(result, extElemMap.values());
}
// Create a Projection for each StatementPattern in the constructor
List<ProjectionElemList> projections = new ArrayList<ProjectionElemList>();
for (StatementPattern sp : statementPatterns) {
ProjectionElemList projElemList = new ProjectionElemList();
projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));
projections.add(projElemList);
}
if (projections.size() == 1) {
result = new Projection(result, projections.get(0));
// Note: no need to apply the second duplicate elimination step if
// there's just one projection
} else if (projections.size() > 1) {
result = new MultiProjection(result, projections);
if (distinct) {
// Add another distinct to filter duplicate statements
result = new Distinct(result);
} else if (reduced) {
result = new Reduced(result);
}
} else {
// Empty constructor
result = new EmptySet();
}
return result;
}
@Override
public void meet(Var var) {
if (var.getValue() == null) vars.add(var.getName());
super.meet(var);
}
private Resource[] getContexts(Var var) {
return (var == null || !var.hasValue())
? new Resource[0]
: new Resource[] {(Resource) var.getValue()};
}
