Examples with QueryExecException org.apache.jena.query.QueryExecException used on opensource projects

Example 11 with QueryExecException

use of org.apache.jena.query.QueryExecException in project jena by apache.

the class QueryIterAssign method accept.

@Override
public Binding accept(Binding binding) {
    BindingMap b = BindingFactory.create(binding);
    for (Var v : exprs.getVars()) {
        // if "binding", not "b" used, we get (Lisp) "let" 
        // semantics, not the desired "let*" semantics
        Node n = exprs.get(v, b, getExecContext());
        if (n == null)
            // Expression failed to evaluate - no assignment
            continue;
        // Check is already has a value; if so, must be sameValueAs
        if (b.contains(v)) {
            // Optimization may linearize to push a stream through an (extend).
            if (false && mustBeNewVar)
                throw new QueryExecException("Already set: " + v);
            Node n2 = b.get(v);
            if (!n2.sameValueAs(n))
                // Error in single assignment.
                return null;
            continue;
        }
        b.add(v, n);
    }
    return b;
}

Example 12 with QueryExecException

use of org.apache.jena.query.QueryExecException in project jena by apache.

the class QueryEngineBase method prepareDataset.

private DatasetGraph prepareDataset(DatasetGraph originalDataset, Query query) {
    DatasetDescription dsDesc = DatasetDescription.create(query, context);
    DatasetGraph dsg = originalDataset;
    if (dsg != null) {
        if (dsDesc != null) {
            if (query.hasDatasetDescription())
                dsg = dynamicDataset(dsDesc, dsg, false);
        }
        return dsg;
    }
    // No DatasetGraph
    if (!query.hasDatasetDescription())
        throw new QueryExecException("No dataset and no dataset description for query");
    // DatasetDescription : Build it.
    String baseURI = query.getBaseURI();
    if (baseURI == null)
        baseURI = IRIs.getSystemBase().str();
    dsg = DatasetUtils.createDatasetGraph(dsDesc, baseURI);
    return dsg;
}

Example 13 with QueryExecException

use of org.apache.jena.query.QueryExecException in project jena by apache.

the class QueryExecDataset method constructQuads.

// -- Construct Quads
@Override
public Iterator<Quad> constructQuads() {
    checkNotClosed();
    if (!query.isConstructType())
        throw new QueryExecException("Attempt to get a CONSTRUCT model from a " + labelForQuery(query) + " query");
    // This causes there to be no PROJECT around the pattern.
    // That in turn, exposes the initial bindings.
    query.setQueryResultStar(true);
    startQueryIterator();
    Template template = query.getConstructTemplate();
    return TemplateLib.calcQuads(template.getQuads(), queryIterator);
}

Example 14 with QueryExecException

use of org.apache.jena.query.QueryExecException in project jena by apache.

the class QueryExecDataset method constructTriples.

@Override
public Iterator<Triple> constructTriples() {
    checkNotClosed();
    if (!query.isConstructType())
        throw new QueryExecException("Attempt to get a CONSTRUCT model from a " + labelForQuery(query) + " query");
    // This causes there to be no PROJECT around the pattern.
    // That in turn, exposes the initial bindings.
    query.setQueryResultStar(true);
    startQueryIterator();
    Template template = query.getConstructTemplate();
    return TemplateLib.calcTriples(template.getTriples(), queryIterator);
}

Example 15 with QueryExecException

use of org.apache.jena.query.QueryExecException in project jena by apache.

the class QueryExecDataset method ask.

@Override
public boolean ask() {
    checkNotClosed();
    if (!query.isAskType())
        throw new QueryExecException("Attempt to have boolean from a " + labelForQuery(query) + " query");
    startQueryIterator();
    boolean r;
    try {
        // Not hasNext because setting timeout1 which applies to getting
        // the first result, not testing for it.
        queryIterator.next();
        r = true;
    } catch (NoSuchElementException ex) {
        r = false;
    } finally {
        this.close();
    }
    return r;
}