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

Example 1 with QueryResultFormat

use of org.eclipse.rdf4j.query.resultio.QueryResultFormat in project rdf4j by eclipse.

the class SPARQLProtocolSession method sendTupleQueryViaHttp.

/**
 * Send the tuple query via HTTP and throws an exception in case anything goes wrong, i.e. only for HTTP
 * 200 the method returns without exception. If HTTP status code is not equal to 200, the request is
 * aborted, however pooled connections are not released.
 *
 * @param method
 * @throws RepositoryException
 * @throws HttpException
 * @throws IOException
 * @throws QueryInterruptedException
 * @throws MalformedQueryException
 */
private HttpResponse sendTupleQueryViaHttp(HttpUriRequest method, Set<QueryResultFormat> tqrFormats) throws RepositoryException, IOException, QueryInterruptedException, MalformedQueryException {
    final List<String> acceptValues = new ArrayList<String>(tqrFormats.size());
    for (QueryResultFormat format : tqrFormats) {
        // Determine a q-value that reflects the user specified preference
        int qValue = 10;
        if (preferredTQRFormat != null && !preferredTQRFormat.equals(format)) {
            // Prefer specified format over other formats
            qValue -= 2;
        }
        for (String mimeType : format.getMIMETypes()) {
            String acceptParam = mimeType;
            if (qValue < 10) {
                acceptParam += ";q=0." + qValue;
            }
            acceptValues.add(acceptParam);
        }
    }
    method.addHeader(ACCEPT_PARAM_NAME, String.join(", ", acceptValues));
    try {
        return executeOK(method);
    } catch (RepositoryException | MalformedQueryException | QueryInterruptedException e) {
        throw e;
    } catch (RDF4JException e) {
        throw new RepositoryException(e);
    }
}

Example 2 with QueryResultFormat

use of org.eclipse.rdf4j.query.resultio.QueryResultFormat in project rdf4j by eclipse.

the class SPARQLProtocolSession method getBoolean.

/**
 * Parse the response in this thread using a suitable {@link BooleanQueryResultParser}. All HTTP
 * connections are closed and released in this method
 *
 * @throws RDF4JException
 */
protected boolean getBoolean(HttpUriRequest method) throws IOException, RDF4JException {
    // Specify which formats we support using Accept headers
    Set<QueryResultFormat> booleanFormats = BooleanQueryResultParserRegistry.getInstance().getKeys();
    if (booleanFormats.isEmpty()) {
        throw new RepositoryException("No boolean query result parsers have been registered");
    }
    // send the tuple query
    HttpResponse response = sendBooleanQueryViaHttp(method, booleanFormats);
    try {
        // if we get here, HTTP code is 200
        String mimeType = getResponseMIMEType(response);
        try {
            QueryResultFormat format = BooleanQueryResultFormat.matchMIMEType(mimeType, booleanFormats).orElseThrow(() -> new RepositoryException("Server responded with an unsupported file format: " + mimeType));
            BooleanQueryResultParser parser = QueryResultIO.createBooleanParser(format);
            QueryResultCollector results = new QueryResultCollector();
            parser.setQueryResultHandler(results);
            parser.parseQueryResult(response.getEntity().getContent());
            return results.getBoolean();
        } catch (QueryResultParseException e) {
            throw new RepositoryException("Malformed query result from server", e);
        }
    } finally {
        EntityUtils.consumeQuietly(response.getEntity());
    }
}

Example 3 with QueryResultFormat

use of org.eclipse.rdf4j.query.resultio.QueryResultFormat in project rdf4j by eclipse.

the class SPARQLProtocolSession method getBackgroundTupleQueryResult.

/*------------------*
	 * Response parsing *
	 *------------------*/
/**
 * Parse the response in a background thread. HTTP connections are dealt with in the
 * {@link BackgroundTupleResult} or (in the error-case) in this method.
 */
protected TupleQueryResult getBackgroundTupleQueryResult(HttpUriRequest method) throws RepositoryException, QueryInterruptedException, MalformedQueryException, IOException {
    boolean submitted = false;
    // Specify which formats we support
    Set<QueryResultFormat> tqrFormats = TupleQueryResultParserRegistry.getInstance().getKeys();
    if (tqrFormats.isEmpty()) {
        throw new RepositoryException("No tuple query result parsers have been registered");
    }
    TupleQueryResult tRes = null;
    // send the tuple query
    HttpResponse response = sendTupleQueryViaHttp(method, tqrFormats);
    try {
        // if we get here, HTTP code is 200
        String mimeType = getResponseMIMEType(response);
        QueryResultFormat format = TupleQueryResultFormat.matchMIMEType(mimeType, tqrFormats).orElseThrow(() -> new RepositoryException("Server responded with an unsupported file format: " + mimeType));
        TupleQueryResultParser parser = QueryResultIO.createTupleParser(format, getValueFactory());
        tRes = background.parse(parser, response.getEntity().getContent());
        submitted = true;
        return tRes;
    } finally {
        if (!submitted) {
            EntityUtils.consumeQuietly(response.getEntity());
        }
    }
}

Example 4 with QueryResultFormat

use of org.eclipse.rdf4j.query.resultio.QueryResultFormat in project rdf4j by eclipse.

the class SPARQLProtocolSession method sendBooleanQueryViaHttp.

private HttpResponse sendBooleanQueryViaHttp(HttpUriRequest method, Set<QueryResultFormat> booleanFormats) throws IOException, RDF4JException {
    final List<String> acceptValues = new ArrayList<>(booleanFormats.size());
    for (QueryResultFormat format : booleanFormats) {
        // Determine a q-value that reflects the user specified preference
        int qValue = 10;
        if (preferredBQRFormat != null && !preferredBQRFormat.equals(format)) {
            // Prefer specified format over other formats
            qValue -= 2;
        }
        for (String mimeType : format.getMIMETypes()) {
            String acceptParam = mimeType;
            if (qValue < 10) {
                acceptParam += ";q=0." + qValue;
            }
            acceptValues.add(acceptParam);
        }
    }
    method.addHeader(ACCEPT_PARAM_NAME, String.join(", ", acceptValues));
    return executeOK(method);
}

Example 5 with QueryResultFormat

use of org.eclipse.rdf4j.query.resultio.QueryResultFormat in project rdf4j by eclipse.

the class SPARQLProtocolSession method getTupleQueryResult.

/**
 * Parse the response in this thread using the provided {@link TupleQueryResultHandler}. All HTTP
 * connections are closed and released in this method
 */
protected void getTupleQueryResult(HttpUriRequest method, TupleQueryResultHandler handler) throws IOException, TupleQueryResultHandlerException, RepositoryException, MalformedQueryException, UnauthorizedException, QueryInterruptedException {
    // Specify which formats we support
    Set<QueryResultFormat> tqrFormats = TupleQueryResultParserRegistry.getInstance().getKeys();
    if (tqrFormats.isEmpty()) {
        throw new RepositoryException("No tuple query result parsers have been registered");
    }
    // send the tuple query
    HttpResponse response = sendTupleQueryViaHttp(method, tqrFormats);
    try {
        // if we get here, HTTP code is 200
        String mimeType = getResponseMIMEType(response);
        try {
            QueryResultFormat format = TupleQueryResultFormat.matchMIMEType(mimeType, tqrFormats).orElseThrow(() -> new RepositoryException("Server responded with an unsupported file format: " + mimeType));
            TupleQueryResultParser parser = QueryResultIO.createTupleParser(format, getValueFactory());
            parser.setQueryResultHandler(handler);
            parser.parseQueryResult(response.getEntity().getContent());
        } catch (QueryResultParseException e) {
            throw new RepositoryException("Malformed query result from server", e);
        } catch (QueryResultHandlerException e) {
            if (e instanceof TupleQueryResultHandlerException) {
                throw (TupleQueryResultHandlerException) e;
            } else {
                throw new TupleQueryResultHandlerException(e);
            }
        }
    } finally {
        EntityUtils.consumeQuietly(response.getEntity());
    }
}