Java Code Examples for org.apache.jena.rdf.model.NodeIterator#hasNext()

String getValueOfDataProperty(RDFNode subject, String predicateURI, Map<String, Object> args) {

        final NodeIterator iterator = this.model.listObjectsOfProperty(subject.asResource(), getPropertyFromUri(predicateURI));
        while (iterator.hasNext()) {

            final RDFNode data = iterator.next();
            if (data.isLiteral()) {

                if (args.containsKey("lang")
                        && args.get("lang").toString().equalsIgnoreCase(data.asLiteral().getLanguage())) {
                    return data.asLiteral().getString();
                } else {
                    return data.asLiteral().getString();
                }
            }
        }
        return null;
    }
 

List<String> getValuesOfDataProperty(RDFNode subject, String predicateURI, Map<String, Object> args) {

        final List<String> valList = new ArrayList<>();

        final NodeIterator iterator = model.listObjectsOfProperty(subject.asResource(), getPropertyFromUri(predicateURI));

        while (iterator.hasNext()) {

            RDFNode data = iterator.next();

            if (data.isLiteral()) {
                if (!args.containsKey("lang") || args.get("lang").toString().equalsIgnoreCase(data.asLiteral().getLanguage())) {
                        valList.add(data.asLiteral().getString());
                }
            }
        }
        return valList;
    }
 

List<String> getValuesOfDataProperty(RDFNode subject, String predicateURI, Map<String, Object> args) {

        List<String> valList = new ArrayList<>();

        NodeIterator iterator = this.model.listObjectsOfProperty(subject.asResource(), getPropertyFromUri(predicateURI));

        while (iterator.hasNext()) {

            RDFNode data = iterator.next();

            if (data.isLiteral()) {
                if (args.containsKey("lang")) {
                    if (data.asLiteral().getLanguage().equals(args.get("lang").toString())) {
                        valList.add(data.asLiteral().getString());
                    }
                } else {
                    valList.add(data.asLiteral().getString());
                }
            }
        }
        return valList;
    }
 

/**
 * Finds all RTM_IN_SCOPE properties for this property and returns a
 * collection containing the RDF URIs of the values as URILocators.
 */
private Collection getScope(RDFNode rdfprop, Model model)
  throws JenaException, MalformedURLException {

  Resource subject = (Resource) rdfprop;
  Property prop = model.getProperty(RTM_IN_SCOPE);
  NodeIterator it = model.listObjectsOfProperty(subject, prop);
  ArrayList scope = new ArrayList();

  while (it.hasNext()) {
    Object o = it.next();

    if (!(o instanceof Resource))
      throw new RDFMappingException("Scoping topic must be specified by a resource, not by " + o);

    Resource obj = (Resource) o;
    LocatorIF loc = new URILocator(obj.getURI());
    scope.add(loc);
  }

  return scope;
}
 

private TopicIF getType(RDFNode rdfprop, Model model)
  throws JenaException, MalformedURLException {

  Resource subject = (Resource) rdfprop;
  Property prop = model.getProperty(RTM_TYPE);
  NodeIterator it = model.listObjectsOfProperty(subject, prop);
  while (it.hasNext()) {
    Resource obj = (Resource) it.next();
    LocatorIF loc = new URILocator(obj.getURI());
    TopicIF topic = topicmap.getTopicBySubjectIdentifier(loc);
    if (topic == null) {
      topic = builder.makeTopic();
      topic.addSubjectIdentifier(loc);
    }
    return topic;
  }
  return null;
}
 

private Set<String> findIdentifiers(Model model, Set<String> input, LinkedList<QueryNode> path) {

        Set<String> subjects;
        Set<String> objects;
        if (input == null) {
            objects = new HashSet<>();
        } else {
            objects = input;
        }

        // NB: This hasn't been converted to use the NIO streaming API as it uses reentrant recursion
        for (QueryNode queryNode : path) {
            subjects = new HashSet<>(objects);
            objects = new HashSet<>();
            if (!subjects.isEmpty()) {
                for (String subject : subjects) {
                    Resource subjectResource = model.createResource(subject);
                    NodeIterator partialObjects = model.listObjectsOfProperty(subjectResource, queryNode.getNode());
                    while (partialObjects.hasNext()) {
                        objects.add(partialObjects.next().toString());
                    }
                }

            } else {

                NodeIterator objectsIterator = model.listObjectsOfProperty(queryNode.getNode());
                while (objectsIterator.hasNext()) {
                    objects.add(objectsIterator.next().toString());
                }
            }
        }
        return objects;
    }
 

RDFNode getValueOfObjectProperty(RDFNode subject, String predicateURI, String targetURI) {
    NodeIterator iterator = this.model.listObjectsOfProperty(subject.asResource(), getPropertyFromUri(predicateURI));

    while (iterator.hasNext()) {
        RDFNode next = iterator.next();
        if (!next.isLiteral()) {
            if (targetURI != null && this.model.contains(next.asResource(), getPropertyFromUri(HGQLVocabulary.RDF_TYPE), getResourceFromUri(targetURI))) {
                return next;
            }
        }
    }
    return null;
}
 

protected Set<String> findIdentifiers(Model model, Set<String> input, LinkedList<QueryNode> path) {

        Set<String> subjects;
        Set<String> objects;
        if (input == null) {
            objects = new HashSet<>();
        } else {
            objects = input;
        }

        // NB: This hasn't been converted to use the NIO streaming API as it uses reentrant recursion
        for (QueryNode queryNode : path) {
            subjects = new HashSet<>(objects);
            objects = new HashSet<>();
            if (!subjects.isEmpty()) {
                for (String subject : subjects) {
                    Resource subjectResource = model.createResource(subject);
                    NodeIterator partialObjects = model.listObjectsOfProperty(subjectResource, queryNode.getNode());
                    while (partialObjects.hasNext()) {
                        objects.add(partialObjects.next().toString());
                    }
                }

            } else {

                NodeIterator objectsIterator = model.listObjectsOfProperty(queryNode.getNode());
                while (objectsIterator.hasNext()) {
                    objects.add(objectsIterator.next().toString());
                }
            }
        }
        return objects;
    }
 

RDFNode getValueOfObjectProperty(RDFNode subject, String predicateURI, String targetURI) {

        NodeIterator iterator = this.model.listObjectsOfProperty(subject.asResource(), getPropertyFromUri(predicateURI));
        while (iterator.hasNext()) {

            RDFNode next = iterator.next();
            if (!next.isLiteral()) {
                if (targetURI != null && this.model.contains(next.asResource(), getPropertyFromUri(HGQLVocabulary.RDF_TYPE), getResourceFromUri(targetURI))) {
                    return next;
                }
            }
        }
        return null;
    }
 

private void exportMembers(final Model model, final Set<URI> inboundMembers) {
    for (final String p : config.getPredicates()) {
        final NodeIterator members = model.listObjectsOfProperty(createProperty(p));
        while (members.hasNext()) {
            export(URI.create(members.nextNode().toString()));
        }
    }

    if (inboundMembers != null) {
        for (final URI inbound : inboundMembers) {
            export(inbound);
        }
    }
}
 

/**
 * Gets a Set of all superclasses (rdfs:subClassOf) of a given Resource. 
 * @param subClass  the subClass Resource
 * @return a Collection of class resources
 */
public static Collection<Resource> getSuperClasses(Resource subClass) {
	NodeIterator it = subClass.getModel().listObjectsOfProperty(subClass, RDFS.subClassOf);
	Set<Resource> results = new HashSet<>();
	while (it.hasNext()) {
		RDFNode node = it.nextNode();
		if (node instanceof Resource) {
			results.add((Resource)node);
		}
	}
	return results;
}
 

private LocatorIF getTopicIndicator(Resource subject, String property,
                                    Model model)
  throws JenaException, MalformedURLException {
  Property prop = model.getProperty(property);
  NodeIterator it = model.listObjectsOfProperty(subject, prop);
  while (it.hasNext()) {
    Resource obj = (Resource) it.next();
    if (obj.isAnon())
      continue; // FIXME: is this really ok?
    return new URILocator(obj.getURI());
  }
  return null;
}