Examples with SPARQLResultsXMLWriter org.eclipse.rdf4j.query.resultio.sparqlxml.SPARQLResultsXMLWriter used on opensource projects

Example 1 with SPARQLResultsXMLWriter

use of org.eclipse.rdf4j.query.resultio.sparqlxml.SPARQLResultsXMLWriter in project incubator-rya by apache.

the class RdfController method queryRdf.

@RequestMapping(value = "/queryrdf", method = { RequestMethod.GET, RequestMethod.POST })
public void queryRdf(@RequestParam("query") final String query, @RequestParam(value = RdfCloudTripleStoreConfiguration.CONF_QUERY_AUTH, required = false) String auth, @RequestParam(value = RdfCloudTripleStoreConfiguration.CONF_CV, required = false) final String vis, @RequestParam(value = RdfCloudTripleStoreConfiguration.CONF_INFER, required = false) final String infer, @RequestParam(value = "nullout", required = false) final String nullout, @RequestParam(value = RdfCloudTripleStoreConfiguration.CONF_RESULT_FORMAT, required = false) final String emit, @RequestParam(value = "padding", required = false) final String padding, @RequestParam(value = "callback", required = false) final String callback, final HttpServletRequest request, final HttpServletResponse response) {
    // WARNING: if you add to the above request variables,
    // Be sure to validate and encode since they come from the outside and could contain odd damaging character sequences.
    SailRepositoryConnection conn = null;
    final Thread queryThread = Thread.currentThread();
    auth = StringUtils.arrayToCommaDelimitedString(provider.getUserAuths(request));
    final Timer timer = new Timer();
    timer.schedule(new TimerTask() {

        @Override
        public void run() {
            log.debug("interrupting");
            queryThread.interrupt();
        }
    }, QUERY_TIME_OUT_SECONDS * 1000);
    try {
        final ServletOutputStream os = response.getOutputStream();
        conn = repository.getConnection();
        final Boolean isBlankQuery = StringUtils.isEmpty(query);
        final ParsedOperation operation = QueryParserUtil.parseOperation(QueryLanguage.SPARQL, query, null);
        final Boolean requestedCallback = !StringUtils.isEmpty(callback);
        final Boolean requestedFormat = !StringUtils.isEmpty(emit);
        if (!isBlankQuery) {
            if (operation instanceof ParsedGraphQuery) {
                // Perform Graph Query
                final RDFHandler handler = new RDFXMLWriter(os);
                response.setContentType("text/xml");
                performGraphQuery(query, conn, auth, infer, nullout, handler);
            } else if (operation instanceof ParsedTupleQuery) {
                // Perform Tuple Query
                TupleQueryResultHandler handler;
                if (requestedFormat && emit.equalsIgnoreCase("json")) {
                    handler = new SPARQLResultsJSONWriter(os);
                    response.setContentType("application/json");
                } else {
                    handler = new SPARQLResultsXMLWriter(os);
                    response.setContentType("text/xml");
                }
                performQuery(query, conn, auth, infer, nullout, handler);
            } else if (operation instanceof ParsedUpdate) {
                // Perform Update Query
                performUpdate(query, conn, os, infer, vis);
            } else {
                throw new MalformedQueryException("Cannot process query. Query type not supported.");
            }
        }
        if (requestedCallback) {
            os.print(")");
        }
    } catch (final Exception e) {
        log.error("Error running query", e);
        throw new RuntimeException(e);
    } finally {
        if (conn != null) {
            try {
                conn.close();
            } catch (final RepositoryException e) {
                log.error("Error closing connection", e);
            }
        }
    }
    timer.cancel();
}

Example 2 with SPARQLResultsXMLWriter

use of org.eclipse.rdf4j.query.resultio.sparqlxml.SPARQLResultsXMLWriter in project incubator-rya by apache.

the class CbSailProducer method performSelect.

protected Object performSelect(final String query, final String auth, final Boolean infer) throws RepositoryException, MalformedQueryException, QueryEvaluationException, TupleQueryResultHandlerException {
    final TupleQuery tupleQuery = connection.prepareTupleQuery(QueryLanguage.SPARQL, query);
    if (auth != null && auth.length() > 0) {
        tupleQuery.setBinding(CONF_QUERY_AUTH, VALUE_FACTORY.createLiteral(auth));
    }
    if (infer != null) {
        tupleQuery.setBinding(CONF_INFER, VALUE_FACTORY.createLiteral(infer));
    }
    if (CbSailEndpoint.CbSailOutput.BINARY.equals(queryOutput)) {
        final List listOutput = new ArrayList();
        final AbstractTupleQueryResultHandler handler = new AbstractTupleQueryResultHandler() {

            @Override
            public void handleSolution(final BindingSet bindingSet) throws TupleQueryResultHandlerException {
                final Map<String, String> map = new HashMap<String, String>();
                for (final String s : bindingSet.getBindingNames()) {
                    map.put(s, bindingSet.getBinding(s).getValue().stringValue());
                }
                listOutput.add(map);
            }
        };
        tupleQuery.evaluate(handler);
        return listOutput;
    } else if (CbSailEndpoint.CbSailOutput.XML.equals(queryOutput)) {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final SPARQLResultsXMLWriter sparqlWriter = new SPARQLResultsXMLWriter(baos);
        tupleQuery.evaluate(sparqlWriter);
        return new String(baos.toByteArray(), StandardCharsets.UTF_8);
    } else {
        throw new IllegalArgumentException("Query Output[" + queryOutput + "] is not recognized");
    }
}