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

Example 11 with StatementPatternNode

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

the class EmptyLabelServiceOptimizer method addResolutionIfSuffix.

/**
 * Add the join group to resolve a variable if it matches a suffix,
 * returning true if it matched, false otherwise.
 */
@SuppressFBWarnings(value = "OCP_OVERLY_CONCRETE_PARAMETER", justification = "Using AST2BOpContext makes sense since it is the only type that will ever be passed")
private boolean addResolutionIfSuffix(AST2BOpContext ctx, JoinGroupNode g, String suffix, URI labelType, IVariable<IV> iVar) {
    if (!iVar.getName().endsWith(suffix)) {
        return false;
    }
    String source = iVar.getName().substring(0, iVar.getName().length() - suffix.length());
    IConstant<IV> labelTypeAsConstant = ctx.getAbstractTripleStore().getVocabulary().getConstant(labelType);
    g.addArg(new StatementPatternNode(new VarNode(source), new ConstantNode(labelTypeAsConstant), new VarNode(iVar)));
    return true;
}

Example 12 with StatementPatternNode

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

the class LabelServiceExtractOptimizer method optimizeJoinGroup.

@Override
protected void optimizeJoinGroup(AST2BOpContext ctx, StaticAnalysis sa, IBindingSet[] bSets, JoinGroupNode op) {
    final QueryRoot root = sa.getQueryRoot();
    if (root.getQueryType() == QueryType.ASK) {
        return;
    }
    LabelServiceUtils.getLabelServiceNodes(op).forEach(service -> {
        JoinGroupNode g = (JoinGroupNode) service.getGraphPattern();
        final List<StatementPatternNode> extractedNodes = new ArrayList<>();
        for (BOp st : g.args()) {
            StatementPatternNode sn = (StatementPatternNode) st;
            if (sn.s().isConstant() && BD.SERVICE_PARAM.equals(sn.s().getValue())) {
                if (WikidataServicePlacementOptimizer.DISABLE_REORDERING.equals(sn.p().getValue())) {
                    String flag = sn.o().getValue().stringValue();
                    service.annotations().put(WikidataServicePlacementOptimizer.DISABLE_REORDERING_ANNOTATION, Boolean.valueOf(flag));
                }
                // skip parameters
                continue;
            }
            extractedNodes.add(sn);
        }
        for (BOp node : extractedNodes) {
            g.removeArg(node);
        }
        if (!extractedNodes.isEmpty()) {
            service.annotations().put(EXTRACTOR_ANNOTATION, extractedNodes);
        }
    });
}

Example 13 with StatementPatternNode

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

the class GeoService method getPatternNode.

/**
 * Extract pattern node from parameters.
 *
 * Pattern node looks like:
 *  ?place wdt:P625 ?location .
 * Both variables would be bound by the service.
 */
protected StatementPatternNode getPatternNode(ServiceCallCreateParams params) {
    ServiceNode serviceNode = params.getServiceNode();
    if (serviceNode == null)
        throw new IllegalArgumentException();
    List<StatementPatternNode> patterns = getStatementPatterns(serviceNode);
    if (patterns.isEmpty()) {
        throw new IllegalArgumentException("This service requires arguments");
    }
    StatementPatternNode pattern = patterns.get(0);
    if (pattern == null) {
        throw new IllegalArgumentException();
    }
    if (!pattern.s().isVariable()) {
        throw new IllegalArgumentException("Search pattern subject must be a variable");
    }
    if (!pattern.p().isConstant()) {
        // FIXME: may be not necessary?
        throw new IllegalArgumentException("Search pattern predicate must be a constant");
    }
    if (!pattern.o().isVariable()) {
        throw new IllegalArgumentException("Search pattern object must be a variable");
    }
    return pattern;
}