Examples with TermNode com.bigdata.rdf.sparql.ast.TermNode used on opensource projects

Example 1 with TermNode

use of com.bigdata.rdf.sparql.ast.TermNode in project wikidata-query-rdf by wikimedia.

the class GeoService method getRequiredBound.

@Override
public Set<IVariable<?>> getRequiredBound(final ServiceNode serviceNode) {
    /**
     * This method extracts exactly those variables that are incoming,
     * i.e. must be bound before executing the execution of the service.
     *
     * Those can be only in service parameters.
     */
    final Set<IVariable<?>> requiredBound = new HashSet<>();
    for (StatementPatternNode sp : getStatementPatterns(serviceNode)) {
        final TermNode subj = sp.s();
        final IVariableOrConstant<?> object = sp.o().getValueExpression();
        if (subj.isConstant() && BD.SERVICE_PARAM.equals(subj.getValue()) && object instanceof IVariable<?>) {
            // the subject var is what we return
            requiredBound.add((IVariable<?>) object);
        }
    }
    return requiredBound;
}

Example 2 with TermNode

use of com.bigdata.rdf.sparql.ast.TermNode in project wikidata-query-rdf by wikimedia.

the class MWApiServiceFactory method serviceParamsFromNode.

/**
 * Get service params from Service Node.
 * FIXME: copypaste from ServiceParams.java, should be integrated there
 */
private ServiceParams serviceParamsFromNode(final ServiceNode serviceNode) {
    requireNonNull(serviceNode, "Service node is null?");
    final GraphPatternGroup<IGroupMemberNode> group = serviceNode.getGraphPattern();
    requireNonNull(group, "Group node is null?");
    final ServiceParams serviceParams = new ServiceParams();
    for (IGroupMemberNode node : group) {
        if (node instanceof StatementPatternNode) {
            final StatementPatternNode sp = (StatementPatternNode) node;
            final TermNode s = sp.s();
            if (s.isConstant() && BD.SERVICE_PARAM.equals(s.getValue())) {
                if (sp.p().isVariable()) {
                    throw new RuntimeException("not a valid service param triple pattern, " + "predicate must be constant: " + sp);
                }
                final URI param = (URI) sp.p().getValue();
                serviceParams.add(param, sp.o());
            }
        }
    }
    return serviceParams;
}

Example 3 with TermNode

use of com.bigdata.rdf.sparql.ast.TermNode in project wikidata-query-rdf by wikimedia.

the class MWApiServiceFactory method getLimitsFromParams.

/**
 * Get limit configuration from service node params.
 * @return Limits object/tracker
 */
MWApiLimits getLimitsFromParams(final ServiceParams serviceParams) {
    int limitResults = -1;
    int limitContinuations = getSettingFromParams(serviceParams, LIMIT_CONTINUATIONS_KEY, -1);
    int limitEmptyContinuations = getSettingFromParams(serviceParams, LIMIT_EMPTY_CONTINUATIONS_KEY, 25);
    TermNode limitResultsNode = serviceParams.get(LIMIT_RESULTS_KEY, null);
    if (limitResultsNode != null) {
        serviceParams.clear(LIMIT_RESULTS_KEY);
        String s = limitResultsNode.getValue().stringValue();
        if (s.equals("once")) {
            // backwards compatibility, there used to be just one limit
            limitContinuations = 0;
        } else {
            limitResults = Integer.parseInt(s);
        }
    }
    return clampLimitsByConfig(limitResults, limitContinuations, limitEmptyContinuations);
}

Example 4 with TermNode

use of com.bigdata.rdf.sparql.ast.TermNode in project wikidata-query-rdf by wikimedia.

the class GeoAroundService method buildServiceNode.

@Override
protected JoinGroupNode buildServiceNode(ServiceCallCreateParams params, ServiceParams serviceParams) {
    final AbstractTripleStore store = params.getTripleStore();
    final Vocabulary voc = store.getVocabulary();
    BigdataValueFactory vf = store.getValueFactory();
    final StatementPatternNode pattern = getPatternNode(params);
    final TermNode searchVar = pattern.s();
    final TermNode predicate = pattern.p();
    final TermNode locationVar = pattern.o();
    final JoinGroupNode newGroup = new JoinGroupNode();
    // ?var geo:search "inCircle" .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.SEARCH)), new DummyConstantNode(vf.createLiteral(GeoFunction.IN_CIRCLE.toString()))));
    // ?var geo:predicate wdt:P625 .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.PREDICATE)), predicate));
    // ?var geo:searchDatatype ogc:wktLiteral .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.SEARCH_DATATYPE)), new ConstantNode(voc.getConstant(new URIImpl(GeoSparql.WKT_LITERAL)))));
    // ?var geo:spatialCircleCenter ?parisLoc .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.SPATIAL_CIRCLE_CENTER)), getParam(serviceParams, CENTER_PARAM)));
    // ?var geo:spatialCircleRadius "1" .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.SPATIAL_CIRCLE_RADIUS)), getParam(serviceParams, RADIUS_PARAM)));
    // ?var geo:locationValue ?location .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.LOCATION_VALUE)), locationVar));
    // ?var geo:coordSystem "0" .
    newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.COORD_SYSTEM)), getGlobeNode(vf, serviceParams)));
    final TermNode distance = serviceParams.get(DISTANCE_PARAM, null);
    if (distance != null) {
        // ?var geo:distanceValue ?distance .
        newGroup.addArg(new StatementPatternNode(searchVar, new DummyConstantNode(vf.asValue(GeoSpatial.DISTANCE_VALUE)), distance));
    }
    return newGroup;
}

Example 5 with TermNode

use of com.bigdata.rdf.sparql.ast.TermNode in project wikidata-query-rdf by wikimedia.

the class MWApiServiceFactory method getServiceHost.

/**
 * Get service host and check if it's valid.
 * @return Service endpoint.
 * @throws MalformedURLException on bad URL
 */
private Endpoint getServiceHost(final ServiceParams serviceParams) throws MalformedURLException {
    TermNode hostNode = serviceParams.get(ENDPOINT_KEY, null);
    requireNonNull(hostNode, "Service name (wikibase:endpoint) should be supplied");
    serviceParams.clear(ENDPOINT_KEY);
    return Endpoint.create(hostNode.getValueExpression(), config);
}