Examples with TupleExpr org.eclipse.rdf4j.query.algebra.TupleExpr used on opensource projects

Example 21 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class SPARQLParserTest method testParsedTupleQueryRootNode.

@Test
public void testParsedTupleQueryRootNode() throws Exception {
    StringBuilder qb = new StringBuilder();
    qb.append("SELECT *  {?a <foo:bar> \"test\"}");
    ParsedTupleQuery q = (ParsedTupleQuery) parser.parseQuery(qb.toString(), null);
    TupleExpr te = q.getTupleExpr();
    assertNotNull(te);
    assertTrue(te instanceof Projection);
    assertNull(te.getParentNode());
}

Example 22 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class TupleExprBuilderTest method testAskQuerySolutionModifiers.

@Test
public void testAskQuerySolutionModifiers() {
    String query = "ASK WHERE { ?foo ?bar ?baz . } ORDER BY ?foo LIMIT 1";
    try {
        TupleExprBuilder builder = new TupleExprBuilder(ValueFactoryImpl.getInstance());
        ASTQueryContainer qc = SyntaxTreeBuilder.parseQuery(query);
        TupleExpr result = builder.visit(qc, null);
        assertTrue(result instanceof Order);
    } catch (Exception e) {
        e.printStackTrace();
        fail("should parse ask query with solution modifiers");
    }
}

Example 23 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class BasicGroup method filteredTuple.

private TupleExpr filteredTuple(TupleExpr theExpr) {
    TupleExpr aExpr = theExpr;
    for (ValueExpr aValEx : mFilters) {
        Filter aFilter = new Filter();
        aFilter.setCondition(aValEx);
        aFilter.setArg(aExpr);
        aExpr = aFilter;
    }
    return aExpr;
}

Example 24 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class GraphPattern method buildTupleExpr.

/**
 * Builds a combined tuple expression from the tuple expressions and constraints in this graph pattern.
 *
 * @return A tuple expression for this graph pattern.
 */
public TupleExpr buildTupleExpr() {
    TupleExpr result;
    if (requiredTEs.isEmpty()) {
        result = new SingletonSet();
    } else {
        result = requiredTEs.get(0);
        for (int i = 1; i < requiredTEs.size(); i++) {
            TupleExpr te = requiredTEs.get(i);
            // if (containsProjection(te) || containsProjection(result))
            // {
            // result = new BottomUpJoin(result, te);
            // }
            // else {
            result = new Join(result, te);
        // }
        }
    }
    for (Map.Entry<TupleExpr, List<ValueExpr>> entry : optionalTEs) {
        List<ValueExpr> constraints = entry.getValue();
        if (constraints != null && !constraints.isEmpty()) {
            ValueExpr condition = constraints.get(0);
            for (int i = 1; i < constraints.size(); i++) {
                condition = new And(condition, constraints.get(i));
            }
            result = new LeftJoin(result, entry.getKey(), condition);
        } else {
            result = new LeftJoin(result, entry.getKey());
        }
    }
    for (ValueExpr constraint : constraints) {
        result = new Filter(result, constraint);
    }
    return result;
}

Example 25 with TupleExpr

use of org.eclipse.rdf4j.query.algebra.TupleExpr in project rdf4j by eclipse.

the class SPARQLParser method parseQuery.

@Override
public ParsedQuery parseQuery(String queryStr, String baseURI) throws MalformedQueryException {
    try {
        ASTQueryContainer qc = SyntaxTreeBuilder.parseQuery(queryStr);
        StringEscapesProcessor.process(qc);
        BaseDeclProcessor.process(qc, baseURI);
        Map<String, String> prefixes = PrefixDeclProcessor.process(qc);
        WildcardProjectionProcessor.process(qc);
        BlankNodeVarProcessor.process(qc);
        if (qc.containsQuery()) {
            // handle query operation
            TupleExpr tupleExpr = buildQueryModel(qc);
            ParsedQuery query;
            ASTQuery queryNode = qc.getQuery();
            if (queryNode instanceof ASTSelectQuery) {
                query = new ParsedTupleQuery(queryStr, tupleExpr);
            } else if (queryNode instanceof ASTConstructQuery) {
                query = new ParsedGraphQuery(queryStr, tupleExpr, prefixes);
            } else if (queryNode instanceof ASTAskQuery) {
                query = new ParsedBooleanQuery(queryStr, tupleExpr);
            } else if (queryNode instanceof ASTDescribeQuery) {
                query = new ParsedDescribeQuery(queryStr, tupleExpr, prefixes);
            } else {
                throw new RuntimeException("Unexpected query type: " + queryNode.getClass());
            }
            // Handle dataset declaration
            Dataset dataset = DatasetDeclProcessor.process(qc);
            if (dataset != null) {
                query.setDataset(dataset);
            }
            return query;
        } else {
            throw new IncompatibleOperationException("supplied string is not a query operation");
        }
    } catch (ParseException e) {
        throw new MalformedQueryException(e.getMessage(), e);
    } catch (TokenMgrError e) {
        throw new MalformedQueryException(e.getMessage(), e);
    }
}