Examples with IVariable com.bigdata.bop.IVariable used on opensource projects

Example 1 with IVariable

use of com.bigdata.bop.IVariable in project wikidata-query-rdf by wikimedia.

the class EmptyLabelServiceOptimizer 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;
    }
    if (root.getWhereClause() == op) {
        op.setProperty(LABEL_SERVICE_PROJECTION, root.getProjection());
    }
    op.getChildren(SubqueryBase.class).forEach(node -> {
        if (node.getWhereClause() != null) {
            BOp whereClause = node.getWhereClause();
            whereClause.setProperty(LABEL_SERVICE_PROJECTION, node.getProjection());
        }
    });
    // Prepare a set of vars, which might be bound both outside of the service and by LabelService
    // Fix for the issue: https://phabricator.wikimedia.org/T159723
    // See also patch for the com.bigdata.rdf.sparql.ast.eval.AST2BOpUtility.addServiceCall()
    Set<IVariable<?>> uncertainVars = collectUncertainVars(sa, bSets, op);
    getLabelServiceNodes(op).forEach(service -> {
        service.setUncertainVars(uncertainVars);
        JoinGroupNode g = (JoinGroupNode) service.getGraphPattern();
        boolean foundArg = false;
        for (BOp st : g.args()) {
            StatementPatternNode sn = (StatementPatternNode) st;
            if (sn.s().isConstant() && BD.SERVICE_PARAM.equals(sn.s().getValue())) {
                continue;
            }
            foundArg = true;
            break;
        }
        if (restoreExtracted(service)) {
            foundArg = true;
        }
        if (!foundArg) {
            addResolutions(ctx, g, getProjectionNode(service));
        }
    });
}

Example 2 with IVariable

use of com.bigdata.bop.IVariable in project wikidata-query-rdf by wikimedia.

the class WikidataServicePlacementOptimizer method findLatestPossiblePositionForTheServiceNode.

private int findLatestPossiblePositionForTheServiceNode(StaticAnalysis sa, BOp serviceNode, final JoinGroupNode joinGroup) {
    int lastJoinIndex = -1;
    // Retrieve inVars from annotations. If no WIKIDATA_SERVICE_IN_VARS annotation provided
    // (which occurs on first run of LabelServicePlacementOptimizer), we still need to
    // traverse the tree, as there might be NamedSubqueryInclude, which might
    // be producing variables for ServiceNode.
    Object inVarsObject = serviceNode.annotations().get(WIKIDATA_SERVICE_IN_VARS);
    @SuppressWarnings("unchecked") Set<IVariable<?>> inVars = inVarsObject instanceof Set ? (Set<IVariable<?>>) inVarsObject : Collections.emptySet();
    for (int i = joinGroup.size() - 1; i >= 0; i--) {
        BOp child = joinGroup.get(i);
        if (child != serviceNode && child instanceof IBindingProducerNode) {
            // will touch any inbound var for the service
            if (checkIfNodeProducesVars(sa, child, inVars)) {
                lastJoinIndex = i;
                break;
            }
        }
    }
    return lastJoinIndex;
}

Example 3 with IVariable

use of com.bigdata.bop.IVariable in project wikidata-query-rdf by wikimedia.

the class MWApiServiceFactory method getRequiredBound.

@Override
public Set<IVariable<?>> getRequiredBound(final ServiceNode serviceNode) {
    ServiceParams params = serviceParamsFromNode(serviceNode);
    ApiTemplate api = getServiceTemplate(params);
    Map<String, IVariableOrConstant> potentialVars = api.getInputVars(params);
    // Extract params that have variables linked to them
    return potentialVars.entrySet().stream().filter(entry -> entry.getValue() != null && entry.getValue().isVar()).map(entry -> (IVariable<?>) entry.getValue()).collect(ImmutableSet.toImmutableSet());
}

Example 4 with IVariable

use of com.bigdata.bop.IVariable 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 5 with IVariable

use of com.bigdata.bop.IVariable in project wikidata-query-rdf by wikimedia.

the class LabelServiceUnitTest method desiredVars.

@SuppressWarnings("unchecked")
@Test
public void desiredVars() {
    JoinGroupNode patterns = new JoinGroupNode();
    // Label
    patterns.addArg(new StatementPatternNode(new VarNode("item"), createURI(RDFS.LABEL), new VarNode("itemLabel")));
    // Description
    patterns.addArg(new StatementPatternNode(new VarNode("item2"), createURI(SchemaDotOrg.DESCRIPTION), new VarNode("itemDesc")));
    // Fixed name
    patterns.addArg(new StatementPatternNode(createURI(uris().entityIdToURI("Q123")), createURI(RDFS.LABEL), new VarNode("qLabel")));
    // Parameters
    patterns.addArg(new StatementPatternNode(createURI(BD.SERVICE_PARAM), createURI(LabelService.LANGUAGE_PARAM), createConstant("en,fr")));
    ServiceNode serviceNode = new ServiceNode(createURI(LabelService.SERVICE_KEY), patterns);
    final LabelService service = new LabelService();
    Set<IVariable<?>> vars = service.getDesiredBound(serviceNode);
    assertThat(vars, hasSize(2));
    assertThat(vars, hasItems(equalTo(Var.var("item")), equalTo(Var.var("item2"))));
}