/**
* This method is invoked when the builtin is called in a rule body.
*
* @param args the array of argument values for the builtin, this is an array of Nodes, some of
* which may be Node_RuleVariables.
* @param length the length of the argument list, may be less than the length of the args array
* for some rule engines
* @param context an execution context giving access to other relevant data
* @return return true if the buildin predicate is deemed to have succeeded in the current
* environment
*/
public boolean bodyCall(Node[] args, int length, RuleContext context) {
if (length != 3) {
throw new BuiltinException(
this, context, "builtin " + getName() + " requires 3 arguments but saw " + length);
}
Node obj = getArg(2, args, context);
Node subj = getArg(0, args, context);
// Allow variables in subject position to correspond to a wild card
if (subj.isVariable()) {
subj = null;
}
// Allow variables in the predicate position to correspond to a wild card
Node pred = getArg(1, args, context);
if (pred.isVariable()) {
pred = null;
}
boolean bContainsObj = context.contains(subj, pred, obj);
if (!bContainsObj) {
return false;
}
// does it contain anything else?
ClosableIterator<Triple> citr = context.find((Node) null, pred, obj);
boolean otherSubject = false;
while (citr.hasNext()) {
Object o = citr.next();
Node tmpSubj = ((Triple) o).getSubject();
if (!tmpSubj.equals(subj)) {
otherSubject = true;
break;
}
}
citr.close();
return !otherSubject;
}
/** Encoding of a node so it can be reconstructed */
public static String serialize(Node n, String base, PrefixMap prefixMap) {
// See also Nodec.
// See also OutputLangUtils - merge and this is a buffering call.
if (n == null) return "<<null>>";
if (n.isBlank()) {
String str = n.getBlankNodeLabel();
// c.f. OutputLangUtils
if (onlySafeBNodeLabels) str = safeBNodeLabel(str);
return "_:" + str;
}
if (n.isLiteral()) return FmtUtils.stringForLiteral((Node_Literal) n, null);
if (n.isURI()) {
String uri = n.getURI();
return stringForURI(uri, base, prefixMap);
}
// Safe name?
if (n.isVariable()) return "?" + n.getName();
//
// if ( n.equals(Node.ANY) )
// return "ANY" ;
throw new TDBException("Failed to turn a node into a string: " + n);
// return null ;
}
/**
* Return an equivalent triple pattern with standardized variable names (?s, ?p, ?o). This
* method is needed to ensure that functionally equivalent triple patterns do not get assigned
* to different entries in the cache.
*
* @param triplePattern
* @return a Triple that is equivalent to triplePattern, but with standard variable names
*/
protected Triple standardizeVarNames(Triple triplePattern) {
Node s = triplePattern.getSubject();
Node p = triplePattern.getPredicate();
Node o = triplePattern.getObject();
// make the key consistent, regardless of user's chosen variable names
if (s.isVariable()) {
s = NodeCreateUtils.create("?s");
}
if (p.isVariable()) {
p = NodeCreateUtils.create("?p");
}
if (o.isVariable()) {
o = NodeCreateUtils.create("?o");
}
return new Triple(s, p, o);
}
protected ElementGroup getWhereClauseWithBlankNodeFilter(Triple triplePattern) {
Node s = triplePattern.getSubject();
Node o = triplePattern.getObject();
ElementGroup whereClause = new ElementGroup();
whereClause.addTriplePattern(triplePattern);
if (s.isVariable()) {
whereClause.addElementFilter(
new ElementFilter(new E_LogicalNot(new E_IsBlank(new ExprVar(s)))));
}
if (o.isVariable()) {
whereClause.addElementFilter(
new ElementFilter(new E_LogicalNot(new E_IsBlank(new ExprVar(o)))));
}
return whereClause;
}
private SWRLIndividualObject makeIndividalObject(final Node node) throws URISyntaxException {
if (node.isVariable()) {
final SWRLIndividualVariable var =
swrlFactory.createIndividualVariable(new URI(varNS + node.getName()));
vars.put(node.toString(), var);
return var;
}
final OWLIndividual ind = owlModel.createIndividual(null, new URI(node.getURI()));
return swrlFactory.wrapIndividual(ind);
}
/**
* this nodeToElement is pretty much identical to that of
* graph.query.patternstagecompiler.compile.
*/
private Element nodeToElement(Node X, Mapping map) {
if (X.equals(Query.ANY)) return Element.ANY;
if (X.isVariable()) {
if (map.hasBound(X)) return new Bound(map.indexOf(X));
else {
freeVarCnt++;
return new Free(X);
}
}
return new Fixed(X);
}
// Replaced by getVarsMentioned
@Deprecated
public static Set<Node> getVariables(Iterable<Node> nodes) {
Set<Node> result = new HashSet<Node>();
for (Node node : nodes) {
if (node.isVariable()) {
result.add(node);
}
}
return result;
}
private SWRLDataObject makeDataObject(final Node node) throws URISyntaxException {
if (node.isVariable()) {
final SWRLDataVariable var =
swrlFactory.createDataVariable(new URI(varNS + node.getName()));
vars.put(node.toString(), var);
return var;
}
final OWLDataValue value =
new OWLDataValueImpl(new LiteralImpl(node, (EnhGraph) owlModel.getImplementation()));
return swrlFactory.wrapDataValue(value);
}
protected Object extractBinding(Map<String, Node> binds, int nodeIndex) {
Node node = this.nodes[nodeIndex];
if (node.isVariable()) {
Node boundNode = binds.get(this.nodes[nodeIndex].getName());
if (boundNode == null) {
throw new UnsupportedOperationException("Unbound variable");
}
node = boundNode;
}
if (node.isConcrete()) {
Node_Concrete lit = (Node_Concrete) node;
if (lit.isLiteral()) return lit.getLiteralValue();
else if (lit.isURI()) return lit.getURI();
else if (lit.isBlank()) return lit.getBlankNodeLabel();
}
throw new UnsupportedOperationException("Incorrect node type for comparison: " + node);
}
protected static String sparqlNode(Node node, String varName) {
if (node == null || node.isVariable()) {
return varName;
} else if (node.isBlank()) {
return "<fake:blank>"; // or throw exception?
} else if (node.isURI()) {
StringBuffer uriBuff = new StringBuffer();
return uriBuff.append("<").append(node.getURI()).append(">").toString();
} else if (node.isLiteral()) {
StringBuffer literalBuff = new StringBuffer();
literalBuff.append("\"");
pyString(literalBuff, node.getLiteralLexicalForm());
literalBuff.append("\"");
if (node.getLiteralDatatypeURI() != null) {
literalBuff.append("^^<").append(node.getLiteralDatatypeURI()).append(">");
} else if (node.getLiteralLanguage() != null && node.getLiteralLanguage().length() > 0) {
literalBuff.append("@").append(node.getLiteralLanguage());
}
return literalBuff.toString();
} else {
return varName;
}
}
public static void addVar(Collection<Var> acc, Node n) {
if (n == null) return;
if (n.isVariable()) acc.add(Var.alloc(n));
}
public void addIfVariable(Node possibleVariable, NodeMaker nodeMaker, AliasMap aliases) {
if (!possibleVariable.isVariable()) return;
add(possibleVariable.getName(), nodeMaker, aliases);
}
/**
* Builds up statements like [] rr:template "http://data.example.com/department/{DEPTNO}" or []
* rr:class ex:Department and returns them as a Statement List.
*
* @param r2rml the target com.hp.hpl.jena.rdf.model.Model
* @param mappingData the target that should be mapped to relational structures (subject,
* predicate or object)
* @param varDefs the construction definition of the target value based in the actual database
* value and some additional data like prefix strings or certain functions like uri( ... )
* @return a List<Statement> containing all the subject map statements
*/
private List<Statement> buildMapStatements(Model r2rml, Node mappingData, VarDefinition varDefs) {
List<Statement> results = new ArrayList<Statement>();
// a blank node []
Resource mapSubject = ResourceFactory.createResource();
// rr:template or rr:column or rr:constant
Property mapPredicate;
// a literal like "http://data.example.com/department/{DEPTNO}" or
// simply "DEPTNO" (column name) or a constant "Foo bar!!"
// (or in rare cases a URI, which is handled separately)
Literal mapObject;
// template or column or constant
if (mappingData.isVariable()) {
Collection<RestrictedExpr> restrictions = varDefs.getDefinitions((Var) mappingData);
List<PredicateAndObject> mapPredicateAndObjects = processRestrictions(restrictions);
for (PredicateAndObject result : mapPredicateAndObjects) {
mapPredicate = result.getPrediacte();
Statement resultStatement;
RDFNode rawObject = result.getRawObject();
// object is literal
if (rawObject.isLiteral()) {
mapObject = rawObject.asLiteral();
resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapObject);
// object is blank node
} else if (rawObject.isAnon()) {
Resource mapResObject = rawObject.asResource();
resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapResObject);
// object is resource
} else {
Resource mapResObject = rawObject.asResource();
resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapResObject);
}
results.add(resultStatement);
}
// everything that is not a variable is handled as a constant
} else if (mappingData.isConcrete()) {
// URIs and Literals have to be handled separately since the methods
// to retrieve the respective value are different
Statement resultStatement;
// URI
if (mappingData.isURI()) {
/*
* This case is somewhat special since the mapObject is not a
* Literal. So, this needs some special handling:
* - the Literal mapObject will not be used
* - a special mapObject_uri Resource will be created
* - the result will be created, appended to the List and
* returned to not go through any further ordinary processing
*/
Resource mapObject_uri = ResourceFactory.createResource(mappingData.getURI());
mapPredicate = ResourceFactory.createProperty(rrNamespace, "constant");
resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapObject_uri);
results.add(resultStatement);
return results;
// Literal
} else if (mappingData.isLiteral()) {
mapObject = ResourceFactory.createPlainLiteral(mappingData.getLiteral().toString(false));
// else (e.g. blank node)
} else { // mapSubject.isBlank() == true
/*
* Hmm... I think this violates the standard. So lean back and
* enjoy the trace...
*/
mapObject = null;
}
mapPredicate = ResourceFactory.createProperty(rrPrefix, "constant");
resultStatement = r2rml.createStatement(mapSubject, mapPredicate, mapObject);
results.add(resultStatement);
}
return results;
}
public List<AlphaResultUnion> calculateAlphaSTG(
Collection<Triple> triples, AbstractConceptMapping cm) throws Exception {
List<AlphaResultUnion> alphaResultUnionList = new Vector<AlphaResultUnion>();
Triple firstTriple = triples.iterator().next();
Node tpSubject = firstTriple.getSubject();
SQLLogicalTable alphaSubject = this.calculateAlphaSubject(tpSubject, cm);
// String logicalTableAlias = cm.getLogicalTableAlias();
String logicalTableAlias = alphaSubject.getAlias();
// if(logicalTableAlias == null || logicalTableAlias.equals("")) {
// cm.setLogicalTableAlias(alphaSubject.getAlias());
// }
// mapping projection of corresponding predicates
for (Triple tp : triples) {
Node tpPredicate = tp.getPredicate();
List<SQLJoinTable> alphaPredicateObjects = new Vector<SQLJoinTable>();
List<SQLLogicalTable> alphaPredicateObjects2 = new Vector<SQLLogicalTable>();
if (tpPredicate.isURI()) {
String tpPredicateURI = tpPredicate.getURI();
Collection<String> mappedClassURIs = cm.getMappedClassURIs();
boolean processableTriplePattern = true;
if (tp.getObject().isURI()) {
String objectURI = tp.getObject().getURI();
if (RDF.type.getURI().equals(tpPredicateURI) && mappedClassURIs.contains(objectURI)) {
processableTriplePattern = false;
}
}
if (processableTriplePattern) {
List<SQLJoinTable> alphaPredicateObjectAux =
calculateAlphaPredicateObjectSTG(tp, cm, tpPredicateURI, logicalTableAlias);
if (alphaPredicateObjectAux != null) {
alphaPredicateObjects.addAll(alphaPredicateObjectAux);
}
List<SQLLogicalTable> alphaPredicateObjectAux2 =
calculateAlphaPredicateObjectSTG2(tp, cm, tpPredicateURI, logicalTableAlias);
if (alphaPredicateObjectAux2 != null) {
alphaPredicateObjects2.addAll(alphaPredicateObjectAux2);
}
AlphaResult alphaResult =
new AlphaResult(alphaSubject, alphaPredicateObjects, tpPredicateURI);
// alphaResult.setAlphaPredicateObjects2(alphaPredicateObjectAux2);
AlphaResultUnion alphaTP = new AlphaResultUnion(alphaResult);
alphaResultUnionList.add(alphaTP);
}
} else if (tpPredicate.isVariable()) {
Collection<AbstractPropertyMapping> pms = cm.getPropertyMappings();
AlphaResultUnion alphaTP = new AlphaResultUnion();
for (AbstractPropertyMapping pm : pms) {
String tpPredicateURI = pm.getMappedPredicateName();
List<SQLJoinTable> alphaPredicateObjectAux =
calculateAlphaPredicateObjectSTG(tp, cm, tpPredicateURI, logicalTableAlias);
if (alphaPredicateObjectAux != null) {
alphaPredicateObjects.addAll(alphaPredicateObjectAux);
}
List<SQLLogicalTable> alphaPredicateObjectAux2 =
calculateAlphaPredicateObjectSTG2(tp, cm, tpPredicateURI, logicalTableAlias);
if (alphaPredicateObjectAux2 != null) {
alphaPredicateObjects2.addAll(alphaPredicateObjectAux2);
}
AlphaResult alphaResult =
new AlphaResult(alphaSubject, alphaPredicateObjects, tpPredicateURI);
// alphaResult.setAlphaPredicateObjects2(alphaPredicateObjectAux2);
alphaTP.add(alphaResult);
}
if (alphaTP != null) {
alphaResultUnionList.add(alphaTP);
}
} else {
String errorMessage = "Predicate has to be either an URI or a variable";
throw new QueryTranslationException(errorMessage);
}
}
return alphaResultUnionList;
}
private boolean isVar(Node node) {
return (node == null || node.isVariable() || node == Node.ANY);
}
private static Node generateCountableNode(int count, Node node1, Node node2) {
if (node2 == node1 && node2.isVariable()) {
node2 = Var.alloc(node2.getName() + "_" + count);
}
return node2;
}
