/**
* This method constructs numeric {@link OpFilter} instance with given index value and using given
* substituted {@link OpFilter} instance
*
* @param index to add all variables in filter block
* @param substitutedOp {@link OpFilter} instance whose filter block will be turned into numeric
* one.
* @return numeric {@link OpFilter} instance
*/
private static Op constructNumericOpFilter(int index, Op substitutedOp) {
Op numericOpFilter = substitutedOp;
// check whether op instance is an OpFilter
if (substitutedOp instanceof OpFilter) {
// turn OpFilter into query
Query query = OpAsQuery.asQuery(substitutedOp);
// System.out.println("Query before: " + query);
// assign index
final int finalIndex = index;
// construct numeric filter block
List<VariablePair> variablePairs = constructVariablePairs(query, finalIndex);
// get query as text
String queryStr = query.toString();
// split query and get filter including second part of query text
String[] splittedQuery = queryStr.split(FILTER_KEYWORD);
// replace variables of given text
String filterIncludingPart = replaceVariables(variablePairs, splittedQuery[1]);
// construct final query
String finalQueryText = splittedQuery[0] + FILTER_KEYWORD + filterIncludingPart;
// System.out.println("Query after: " + finalQueryText);
// create plan for query and get OpFilter instance from it
numericOpFilter =
QueryExecutionFactory.createPlan(
QueryFactory.create(finalQueryText), DatasetGraphFactory.createMem(), null)
.getOp();
}
return numericOpFilter;
}
public static DatasetGraph initFuseki(URL rdfFile, String datasetName) {
URI rdfFileUri = new File(rdfFile.getFile()).toURI();
DatasetGraph datasetGraph = DatasetGraphFactory.createMem();
RDFDataMgr.read(datasetGraph, rdfFileUri.toString());
ServerConfig serverConfig = FusekiConfig.defaultConfiguration(datasetName, datasetGraph, true);
SPARQLServer fusekiServer = new SPARQLServer(serverConfig);
Fuseki.setServer(fusekiServer);
fusekiServer.start();
return datasetGraph;
}