Examples with FieldQuery org.apache.stanbol.entityhub.servicesapi.query.FieldQuery used on opensource projects

Example 41 with FieldQuery

use of org.apache.stanbol.entityhub.servicesapi.query.FieldQuery in project stanbol by apache.

the class ClerezzaYard method find.

@Override
public final QueryResultList<Representation> find(FieldQuery parsedQuery) throws YardException, IllegalArgumentException {
    if (parsedQuery == null) {
        throw new IllegalArgumentException("The parsed query MUST NOT be NULL!");
    }
    final SparqlFieldQuery query = SparqlFieldQueryFactory.getSparqlFieldQuery(parsedQuery);
    int limit = QueryUtils.getLimit(query, getConfig().getDefaultQueryResultNumber(), getConfig().getMaxQueryResultNumber());
    Query sparqlQuery;
    //NOTE:
    // - use the endpoint type standard, because we do not know what type of
    //   SPARQL implementation is configured for Clerezza via OSGI
    String sparqlQueryString = SparqlQueryUtils.createSparqlConstructQuery(query, limit, EndpointTypeEnum.Standard);
    try {
        sparqlQuery = QueryParser.getInstance().parse(sparqlQueryString);
    } catch (ParseException e) {
        log.error("ParseException for SPARQL Query in findRepresentation");
        log.error("FieldQuery: " + query);
        log.error("SPARQL Query: " + sparqlQueryString);
        throw new YardException("Unable to parse SPARQL query generated for the parse FieldQuery", e);
    }
    Object resultObject = tcManager.executeSparqlQuery(sparqlQuery, graph);
    final Graph resultGraph;
    if (resultObject instanceof Graph) {
        resultGraph = (Graph) resultObject;
    } else if (resultObject instanceof ImmutableGraph) {
        resultGraph = new IndexedGraph();
        resultGraph.addAll((ImmutableGraph) resultObject);
    } else {
        log.error("Unable to create " + Graph.class + " instance for query reults of type " + resultObject.getClass() + " (this indicates that the used SPARQL Query was not of type CONSTRUCT)");
        log.error("FieldQuery: " + query);
        log.error("SPARQL Query: " + sparqlQueryString);
        throw new YardException("Unable to process results of Query");
    }
    return new RdfQueryResultList(query, resultGraph);
}