@Override
public void execute_node(
SesameDataSet dataset,
String expression,
TriplesMap parentTriplesMap,
RMLPerformer performer,
Object node,
Resource subject) {
// still need to make it work with more nore-results
// currently it handles only one
if (expression.startsWith("/")) expression = expression.substring(1);
Node node2 = (Node) node;
Nodes nodes = node2.query(expression, nsContext);
for (int i = 0; i < nodes.size(); i++) {
Node n = nodes.get(i);
if (subject == null) performer.perform(n, dataset, parentTriplesMap);
else {
RMLProcessorFactory factory = new ConcreteRMLProcessorFactory();
RMLProcessor subprocessor =
factory.create(map.getLogicalSource().getReferenceFormulation());
RMLPerformer subperformer = new NodeRMLPerformer(subprocessor);
subperformer.perform(n, dataset, parentTriplesMap, subject);
}
}
}
/**
* Extract triplesMap contents.
*
* @param triplesMap
* @param r2rmlMappingGraph
* @param triplesMapSubject
* @param triplesMapResources
* @param storedTriplesMaps
* @throws InvalidR2RMLStructureException
* @throws InvalidR2RMLSyntaxException
* @throws R2RMLDataError
*/
private static void extractTriplesMap(
SesameDataSet r2rmlMappingGraph,
Resource triplesMapSubject,
Map<Resource, TriplesMap> triplesMapResources)
throws InvalidR2RMLStructureException, InvalidR2RMLSyntaxException, R2RMLDataError {
if (log.isDebugEnabled()) {
log.debug(
"[RMLMappingFactory:extractTriplesMap] Extract TriplesMap subject : "
+ triplesMapSubject.stringValue());
}
TriplesMap result = triplesMapResources.get(triplesMapSubject);
// Extract TriplesMap properties
// MVS: create LogicalSource
LogicalSource logicalSource = extractLogicalSource(r2rmlMappingGraph, triplesMapSubject);
// Extract subject
// Create a graph maps storage to save all met graph uri during parsing.
Set<GraphMap> graphMaps = new HashSet<GraphMap>();
// log.debug("[RMLMappingFactory:extractTriplesMap] Current number of created graphMaps : "
// + graphMaps.size());
SubjectMap subjectMap =
extractSubjectMap(r2rmlMappingGraph, triplesMapSubject, graphMaps, result);
// log.debug("[RMLMappingFactory:extractTriplesMap] Current number of created graphMaps : "
// + graphMaps.size());
// Extract predicate-object maps
Set<PredicateObjectMap> predicateObjectMaps =
extractPredicateObjectMaps(
r2rmlMappingGraph, triplesMapSubject, graphMaps, result, triplesMapResources);
log.debug(
"[RMLMappingFactory:extractTriplesMap] Current number of created graphMaps : "
+ graphMaps.size());
// Fill triplesMap
for (PredicateObjectMap predicateObjectMap : predicateObjectMaps) {
result.addPredicateObjectMap(predicateObjectMap);
}
result.setLogicalSource(logicalSource);
result.setSubjectMap(subjectMap);
log.debug(
"[RMLMappingFactory:extractTriplesMap] Extract of TriplesMap subject : "
+ triplesMapSubject.stringValue()
+ " done.");
}
public String execute(Node node, String expression) throws SaxonApiException {
Processor proc = new Processor(false);
XPathCompiler xpath = proc.newXPathCompiler();
DocumentBuilder builder = proc.newDocumentBuilder();
String source = getClass().getResource(map.getLogicalSource().getIdentifier()).getFile();
XdmNode doc = builder.build(new File(source));
String expre = replace(node, expression);
expression =
expression.replaceAll(
"\\{" + expression.split("\\{")[1].split("\\}")[0] + "\\}", "'" + expre + "'");
XPathSelector selector = xpath.compile(expression).load();
selector.setContextItem(doc);
// Evaluate the expression.
Object result = selector.evaluate();
return result.toString();
}
@Override
public void execute(
final SesameDataSet dataset,
final TriplesMap map,
final RMLPerformer performer,
InputStream input) {
try {
this.map = map;
String reference = getReference(map.getLogicalSource());
// Inititalize the XMLDog for processing XPath
// an implementation of javax.xml.namespace.NamespaceContext
// DefaultNamespaceContext dnc = new DefaultNamespaceContext();
DefaultNamespaceContext dnc = get_namespaces();
XMLDog dog = new XMLDog(dnc);
// adding expression to the xpathprocessor
dog.addXPath(reference);
jlibs.xml.sax.dog.sniff.Event event = dog.createEvent();
// event.setXMLBuilder(new DOMBuilder());
// use XOM now
event.setXMLBuilder(new XOMBuilder());
event.setListener(
new InstantEvaluationListener() {
// When an XPath expression matches
@Override
public void onNodeHit(Expression expression, NodeItem nodeItem) {
Node node = (Node) nodeItem.xml;
// if(!nodeItem.namespaceURI.isEmpty())
// log.info("namespace? " + nodeItem.namespaceURI);
// else
// log.info("no namespace.");
// Let the performer do its thing
performer.perform(node, dataset, map);
// System.out.println("XPath: " + expression.getXPath() + " has hit: " +
// node.getTextContent());
}
@Override
public void finishedNodeSet(Expression expression) {
// System.out.println("Finished Nodeset: " + expression.getXPath());
}
@Override
public void onResult(Expression expression, Object result) {
// this method is called only for xpaths which returns primitive result
// i.e result will be one of String, Boolean, Double
// System.out.println("XPath: " + expression.getXPath() + " result: " + result);
}
});
// Execute the streaming
// dog.sniff(event, new InputSource(new FileInputStream(fileName)));
dog.sniff(event, new InputSource(input));
} catch (SAXPathException ex) {
Logger.getLogger(XPathProcessor.class.getName()).log(Level.SEVERE, null, ex);
} catch (XPathException ex) {
Logger.getLogger(XPathProcessor.class.getName()).log(Level.SEVERE, null, ex);
}
}
