Examples with SparqlFieldQuery org.apache.stanbol.entityhub.query.sparql.SparqlFieldQuery used on opensource projects

Example 6 with SparqlFieldQuery

use of org.apache.stanbol.entityhub.query.sparql.SparqlFieldQuery in project stanbol by apache.

the class SparqlSearcher method findEntities.

@Override
public final QueryResultList<String> findEntities(FieldQuery parsedQuery) throws IOException {
    final SparqlFieldQuery query = SparqlFieldQueryFactory.getSparqlFieldQuery(parsedQuery);
    String sparqlQuery = query.toSparqlSelect(false);
    InputStream in = SparqlEndpointUtils.sendSparqlRequest(getQueryUri(), sparqlQuery, DEFAULT_SPARQL_RESULT_CONTENT_TYPE);
    //Move to util class!
    final List<String> entities = extractEntitiesFromJsonResult(in, query.getRootVariableName());
    return new QueryResultListImpl<String>(query, entities.iterator(), String.class);
}

Example 7 with SparqlFieldQuery

use of org.apache.stanbol.entityhub.query.sparql.SparqlFieldQuery in project stanbol by apache.

the class VirtuosoSearcher method find.

@Override
public final QueryResultList<Representation> find(FieldQuery parsedQuery) throws IOException {
    long start = System.currentTimeMillis();
    final SparqlFieldQuery query = SparqlFieldQueryFactory.getSparqlFieldQuery(parsedQuery);
    query.setSparqlEndpointType(SparqlEndpointTypeEnum.Virtuoso);
    String sparqlQuery = query.toSparqlConstruct();
    long initEnd = System.currentTimeMillis();
    log.info("  > InitTime: " + (initEnd - start));
    log.info("  > SPARQL query:\n" + sparqlQuery);
    InputStream in = SparqlEndpointUtils.sendSparqlRequest(getQueryUri(), sparqlQuery, SparqlSearcher.DEFAULT_RDF_CONTENT_TYPE);
    long queryEnd = System.currentTimeMillis();
    log.info("  > QueryTime: " + (queryEnd - initEnd));
    if (in != null) {
        Graph graph;
        Graph rdfData = parser.parse(in, SparqlSearcher.DEFAULT_RDF_CONTENT_TYPE, new IRI(getBaseUri()));
        if (rdfData instanceof Graph) {
            graph = (Graph) rdfData;
        } else {
            graph = new IndexedGraph(rdfData);
        }
        long parseEnd = System.currentTimeMillis();
        log.info("  > ParseTime: " + (parseEnd - queryEnd));
        return new RdfQueryResultList(query, graph);
    } else {
        return null;
    }
}

Example 8 with SparqlFieldQuery

use of org.apache.stanbol.entityhub.query.sparql.SparqlFieldQuery in project stanbol by apache.

the class SesameYard 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);
    RepositoryConnection con = null;
    TupleQueryResult results = null;
    try {
        con = repository.getConnection();
        con.begin();
        //execute the query
        int limit = QueryUtils.getLimit(query, getConfig().getDefaultQueryResultNumber(), getConfig().getMaxQueryResultNumber());
        results = executeSparqlFieldQuery(con, query, limit, true);
        //parse the results and generate the Representations
        //create an own valueFactors so that all the data of the query results
        //are added to the same Sesame Model
        Model model = new TreeModel();
        RdfValueFactory valueFactory = new RdfValueFactory(model, sesameFactory);
        List<Representation> representations = limit > 0 ? new ArrayList<Representation>(limit) : new ArrayList<Representation>();
        Map<String, URI> bindings = new HashMap<String, URI>(query.getFieldVariableMappings().size());
        for (Entry<String, String> mapping : query.getFieldVariableMappings().entrySet()) {
            bindings.put(mapping.getValue(), sesameFactory.createURI(mapping.getKey()));
        }
        while (results.hasNext()) {
            BindingSet result = results.next();
            Value value = result.getValue(query.getRootVariableName());
            if (value instanceof URI) {
                URI subject = (URI) value;
                //link the result with the query result
                model.add(queryRoot, queryResult, subject);
                //now copy over the other selected data
                for (String binding : result.getBindingNames()) {
                    URI property = bindings.get(binding);
                    if (property != null) {
                        model.add(subject, property, result.getValue(binding));
                    }
                //else no mapping for the query.getRootVariableName()
                }
                //create a representation and add it to the results
                representations.add(valueFactory.createRdfRepresentation(subject));
            }
        //ignore non URI results
        }
        con.commit();
        return new SesameQueryResultList(model, query, representations);
    } catch (RepositoryException e) {
        throw new YardException("Unable to execute findReferences query", e);
    } catch (QueryEvaluationException e) {
        throw new YardException("Unable to execute findReferences query", e);
    } finally {
        if (results != null) {
            //close the result if present
            try {
                results.close();
            } catch (QueryEvaluationException ignore) {
            /* ignore */
            }
        }
        if (con != null) {
            try {
                con.close();
            } catch (RepositoryException ignore) {
            /* ignore */
            }
        }
    }
}

Example 9 with SparqlFieldQuery

use of org.apache.stanbol.entityhub.query.sparql.SparqlFieldQuery in project stanbol by apache.

the class SparqlQueryUtilsTest method generateSparqlQueryString.

/**
     * Utility function for generating SparqlQuery
     * @param textWithDoubleQuote
     * @param patternType
     */
private String generateSparqlQueryString(String textWithDoubleQuote, PatternType patternType) {
    int limit = 10;
    FieldQueryFactory qf = DefaultQueryFactory.getInstance();
    FieldQuery query = qf.createFieldQuery();
    String DEFAULT_AUTOCOMPLETE_SEARCH_FIELD = NamespaceEnum.rdfs + "label";
    Collection<String> selectedFields = new ArrayList<String>();
    selectedFields.add(DEFAULT_AUTOCOMPLETE_SEARCH_FIELD);
    query.addSelectedFields(selectedFields);
    query.setConstraint(DEFAULT_AUTOCOMPLETE_SEARCH_FIELD, new TextConstraint(textWithDoubleQuote, patternType, true, "en", null));
    query.setLimit(10);
    query.setOffset(0);
    final SparqlFieldQuery sparqlQuery = SparqlFieldQueryFactory.getSparqlFieldQuery(query);
    return SparqlQueryUtils.createSparqlSelectQuery(sparqlQuery, false, limit, SparqlEndpointTypeEnum.Standard);
}

Example 10 with SparqlFieldQuery

use of org.apache.stanbol.entityhub.query.sparql.SparqlFieldQuery in project stanbol by apache.

the class LarqSearcher method find.

@Override
public final QueryResultList<Representation> find(FieldQuery parsedQuery) throws IOException {
    long start = System.currentTimeMillis();
    final SparqlFieldQuery query = SparqlFieldQueryFactory.getSparqlFieldQuery(parsedQuery);
    query.setSparqlEndpointType(SparqlEndpointTypeEnum.LARQ);
    String sparqlQuery = query.toSparqlConstruct();
    long initEnd = System.currentTimeMillis();
    log.debug("  > InitTime: " + (initEnd - start));
    log.debug("  > SPARQL query:\n" + sparqlQuery);
    InputStream in = SparqlEndpointUtils.sendSparqlRequest(getQueryUri(), sparqlQuery, SparqlSearcher.DEFAULT_RDF_CONTENT_TYPE);
    long queryEnd = System.currentTimeMillis();
    log.debug("  > QueryTime: " + (queryEnd - initEnd));
    if (in != null) {
        Graph graph;
        Graph rdfData = parser.parse(in, SparqlSearcher.DEFAULT_RDF_CONTENT_TYPE, new IRI(getBaseUri()));
        if (rdfData instanceof Graph) {
            graph = (Graph) rdfData;
        } else {
            graph = new IndexedGraph(rdfData);
        }
        long parseEnd = System.currentTimeMillis();
        log.debug("  > ParseTime: " + (parseEnd - queryEnd));
        return new RdfQueryResultList(query, graph);
    } else {
        return null;
    }
}