public static ArrayList<RdfModel> processRDF(InputStream in) {
Model model = ModelFactory.createDefaultModel();
ArrayList<RdfModel> result = new ArrayList<RdfModel>();
if (in != null) {
model.read(in, "RDF/XML");
// Now, I only care these propties: has-title, year-of, full-name. All three of them must
// exist'
for (final ResIterator it = model.listSubjectsWithProperty(RdfPropertyList.p_hasTitle);
it.hasNext(); ) {
RdfModel rm = new RdfModel();
try {
final Resource node =
it.next().asResource(); // node is a resource which has title property
rm.setHasTitle(node.getProperty(RdfPropertyList.p_hasTitle).getString());
StringBuilder authors = new StringBuilder();
StringBuilder dates = new StringBuilder();
for (final StmtIterator all_props = node.listProperties(); all_props.hasNext(); ) {
try {
Resource all_res = all_props.next().getObject().asResource();
StmtIterator fullnames = all_res.listProperties(RdfPropertyList.p_fullName);
StmtIterator years = all_res.listProperties(RdfPropertyList.p_year);
// Just for now I may have mutiple author or dates in a String, seperated by comma
RdfProcess newprocess = new RdfProcess();
while (fullnames.hasNext()) {
String fullname = newprocess.getValue(fullnames.next().getObject());
if (!fullname.equals("Invalid/Lack of Information")) {
authors.append(fullname + " , ");
}
}
while (years.hasNext()) {
String year = newprocess.getValue(years.next().getObject());
if (!year.equals("Invalid/Lack of Information")) {
dates.append(year + " , ");
}
}
} catch (Exception e) {
}
}
rm.setHasDate(dates.toString());
rm.setHasAuthor(authors.toString());
} catch (Exception e) {
}
result.add(rm);
}
}
return result;
}
private Model JoinMap(Model map) {
Model newMap = ModelFactory.createDefaultModel();
StmtIterator stmts = map.listStatements();
while (stmts.hasNext()) {
Statement s = stmts.next();
if (s.getSubject().isURIResource() || s.getObject().isURIResource()) {
s =
newMap.createStatement(
checkUri(s.getSubject().asNode(), newMap).asResource(),
s.getPredicate(),
checkUri(s.getObject().asNode(), newMap));
}
newMap.add(s);
}
return newMap;
}