public String GetResult() {
String result_s = "";
while (results.hasNext()) {
QuerySolution row = results.next();
// RDFNode thing= row.get("rule");
// result_s = row.getLiteral("id").getString();
result_s = result_s + row.getLiteral("id").getString() + ",";
}
if (!result_s.equals("")) {
result_s = result_s.substring(0, result_s.length() - 1);
}
return result_s;
}
/**
* Returns the string value of the first of the properties in the uriDescriptionList for the given
* resource (as an URI). In case the resource does not have any of the properties mentioned, its
* URI is returned. The value is obtained by querying the endpoint and the endpoint is queried
* repeatedly until it gives a response (value or the lack of it)
*
* <p>It is highly recommended that the list contains properties like labels or titles, with test
* values.
*
* @param uri - the URI for which a label is required
* @return a String value, either a label for the parameter or its value if no label is obtained
* from the endpoint
*/
private String getLabelForUri(String uri) {
String result;
if (uriLabelCache.containsKey(uri)) {
return uriLabelCache.get(uri);
}
for (String prop : uriDescriptionList) {
String innerQuery = "SELECT ?r WHERE {<" + uri + "> <" + prop + "> ?r } LIMIT 1";
try {
Query query = QueryFactory.create(innerQuery);
QueryExecution qExec = QueryExecutionFactory.sparqlService(rdfEndpoint, query);
boolean keepTrying = true;
while (keepTrying) {
keepTrying = false;
try {
ResultSet results = qExec.execSelect();
if (results.hasNext()) {
QuerySolution sol = results.nextSolution();
result = EEASettings.parseForJson(sol.getLiteral("r").getLexicalForm());
if (!result.isEmpty()) {
uriLabelCache.put(uri, result);
return result;
}
}
} catch (Exception e) {
keepTrying = true;
logger.warn("Could not get label for uri {}. Retrying.", uri);
} finally {
qExec.close();
}
}
} catch (QueryParseException qpe) {
logger.error("Exception for query {}. The label cannot be obtained", innerQuery);
}
}
return uri;
}
@Override
public EntityDefinition open(Assembler a, Resource root, Mode mode) {
String prologue = "PREFIX : <" + NS + "> PREFIX list: <http://jena.apache.org/ARQ/list#> ";
Model model = root.getModel();
String qs1 =
StrUtils.strjoinNL(
prologue,
"SELECT * {",
" ?eMap :entityField ?entityField ;",
" :map ?map ;",
" :defaultField ?dftField .",
" OPTIONAL {",
" ?eMap :graphField ?graphField",
" }",
" OPTIONAL {",
" ?eMap :langField ?langField",
" }",
" OPTIONAL {",
" ?eMap :uidField ?uidField",
" }",
"}");
ParameterizedSparqlString pss = new ParameterizedSparqlString(qs1);
pss.setIri("eMap", root.getURI());
Query query1 = QueryFactory.create(pss.toString());
QueryExecution qexec1 = QueryExecutionFactory.create(query1, model);
ResultSet rs1 = qexec1.execSelect();
List<QuerySolution> results = ResultSetFormatter.toList(rs1);
if (results.size() == 0) {
Log.warn(this, "Failed to find a valid EntityMap for : " + root);
throw new TextIndexException("Failed to find a valid EntityMap for : " + root);
}
if (results.size() != 1) {
Log.warn(this, "Multiple matches for EntityMap for : " + root);
throw new TextIndexException("Multiple matches for EntityMap for : " + root);
}
QuerySolution qsol1 = results.get(0);
String entityField = qsol1.getLiteral("entityField").getLexicalForm();
String graphField =
qsol1.contains("graphField") ? qsol1.getLiteral("graphField").getLexicalForm() : null;
String langField =
qsol1.contains("langField") ? qsol1.getLiteral("langField").getLexicalForm() : null;
String defaultField =
qsol1.contains("dftField") ? qsol1.getLiteral("dftField").getLexicalForm() : null;
String uniqueIdField =
qsol1.contains("uidField") ? qsol1.getLiteral("uidField").getLexicalForm() : null;
Multimap<String, Node> mapDefs = HashMultimap.create();
Map<String, Analyzer> analyzerDefs = new HashMap<>();
Statement listStmt = root.getProperty(TextVocab.pMap);
while (listStmt != null) {
RDFNode n = listStmt.getObject();
if (!n.isResource()) {
throw new TextIndexException("Text list node is not a resource : " + n);
}
Resource listResource = n.asResource();
if (listResource.equals(RDF.nil)) {
break; // end of the list
}
Statement listEntryStmt = listResource.getProperty(RDF.first);
if (listEntryStmt == null) {
throw new TextIndexException("Text map list is not well formed. No rdf:first property");
}
n = listEntryStmt.getObject();
if (!n.isResource()) {
throw new TextIndexException("Text map list entry is not a resource : " + n);
}
Resource listEntry = n.asResource();
Statement fieldStatement = listEntry.getProperty(TextVocab.pField);
if (fieldStatement == null) {
throw new TextIndexException("Text map entry has no field property");
}
n = fieldStatement.getObject();
if (!n.isLiteral()) {
throw new TextIndexException("Text map entry field property has no literal value : " + n);
}
String field = n.asLiteral().getLexicalForm();
Statement predicateStatement = listEntry.getProperty(TextVocab.pPredicate);
if (predicateStatement == null) {
throw new TextIndexException("Text map entry has no predicate property");
}
n = predicateStatement.getObject();
if (!n.isURIResource()) {
throw new TextIndexException(
"Text map entry predicate property has non resource value : " + n);
}
mapDefs.put(field, n.asNode());
Statement analyzerStatement = listEntry.getProperty(TextVocab.pAnalyzer);
if (analyzerStatement != null) {
n = analyzerStatement.getObject();
if (!n.isResource()) {
throw new TextIndexException("Text map entry analyzer property is not a resource : " + n);
}
Resource analyzerResource = n.asResource();
Analyzer analyzer = (Analyzer) a.open(analyzerResource);
analyzerDefs.put(field, analyzer);
}
// move on to the next element in the list
listStmt = listResource.getProperty(RDF.rest);
}
// Primary field/predicate
if (defaultField != null) {
Collection<Node> c = mapDefs.get(defaultField);
if (c.isEmpty())
throw new TextIndexException("No definition of primary field '" + defaultField + "'");
}
EntityDefinition docDef = new EntityDefinition(entityField, defaultField);
docDef.setGraphField(graphField);
docDef.setLangField(langField);
docDef.setUidField(uniqueIdField);
for (String f : mapDefs.keys()) {
for (Node p : mapDefs.get(f)) docDef.set(f, p);
}
for (String f : analyzerDefs.keySet()) {
docDef.setAnalyzer(f, analyzerDefs.get(f));
}
return docDef;
}
