Examples with TupleExpr org.openrdf.query.algebra.TupleExpr used on opensource projects

Example 1 with TupleExpr

use of org.openrdf.query.algebra.TupleExpr in project backstage by zepheira.

the class TupleQueryBuilder method joinTupleExpressions.

public TupleExpr joinTupleExpressions() {
    Iterator<TupleExpr> i = _tupleExprs.iterator();
    TupleExpr result = i.hasNext() ? i.next() : null;
    while (i.hasNext()) {
        result = new Join(result, i.next());
    }
    return result;
}

Example 2 with TupleExpr

use of org.openrdf.query.algebra.TupleExpr in project backstage by zepheira.

the class TupleQueryBuilder method makeFilterTupleExpr.

public TupleExpr makeFilterTupleExpr() {
    TupleExpr tupleExprs = joinTupleExpressions();
    ValueExpr conditions = joinConditions();
    return (conditions == null) ? tupleExprs : new Filter(tupleExprs, conditions);
}

Example 3 with TupleExpr

use of org.openrdf.query.algebra.TupleExpr in project gocd by gocd.

the class SesameGraph method contextualize.

private void contextualize(Query query) throws Exception {
    if (contextVar == null) {
        return;
    }
    TupleExpr tupleExpr = ((SailQuery) query).getParsedQuery().getTupleExpr();
    tupleExpr.visit(new QueryModelVisitorBase() {

        public void meet(StatementPattern node) throws Exception {
            if (node.getContextVar() != null) {
                throw new UnsupportedSPARQLStatementException("Attempted to execute a SPARQL statement with a GRAPH clause against a context aware graph.");
            }
            node.setContextVar(contextVar);
        }
    });
}

Example 4 with TupleExpr

use of org.openrdf.query.algebra.TupleExpr in project backstage by zepheira.

the class Expression method computeOutputOnValue.

public ExpressionQueryResult computeOutputOnValue(Value value, Database database, SailRepositoryConnection connection) throws ExpressionException {
    TupleQueryBuilder builder = new TupleQueryBuilder();
    Var valueVar = builder.makeVar("value", value);
    ExpressionResult expressionResult = computeOutputOnItem(database, builder, valueVar);
    if (expressionResult.valueExpr instanceof Var) {
        Var resultVar = (Var) expressionResult.valueExpr;
        ProjectionElemList projectionElements = new ProjectionElemList();
        projectionElements.addElement(new ProjectionElem(resultVar.getName()));
        TupleExpr t = builder.makeFilterTupleExpr();
        if (t == null) {
            // TODO[dfhuynh]: This happens if the expression is just "value". I'm not sure what to do here.
            return null;
        }
        Projection projection = new Projection(t, projectionElements);
        TupleQuery query = new MyTupleQuery(new ParsedTupleQuery(projection), connection);
        return new ExpressionQueryResult(query, expressionResult.valueType, resultVar);
    }
    return null;
}

Example 5 with TupleExpr

use of org.openrdf.query.algebra.TupleExpr in project backstage by zepheira.

the class TupleQueryBuilder method getStringSerialization.

public String getStringSerialization() {
    StringBuffer sb = new StringBuffer();
    boolean first = true;
    for (TupleExpr tupleExpr : _tupleExprs) {
        if (first) {
            first = false;
        } else {
            sb.append(';');
        }
        sb.append(QueryModelTreePrinter.printTree(tupleExpr));
    }
    for (ValueExpr valueExpr : _conditions) {
        if (first) {
            first = false;
            sb.append('|');
        } else {
            sb.append(';');
        }
        sb.append(QueryModelTreePrinter.printTree(valueExpr));
    }
    return sb.toString();
}