Java Code Examples for org.eclipse.rdf4j.query.algebra.evaluation.QueryBindingSet#setBinding()

@Override
protected BindingSet convert(BindingSet bIn) throws QueryEvaluationException {
	QueryBindingSet res = new QueryBindingSet();
	int bIndex = Integer.parseInt(bIn.getBinding(INDEX_BINDING_NAME).getValue().stringValue());
	Iterator<Binding> bIter = bIn.iterator();
	while (bIter.hasNext()) {
		Binding b = bIter.next();
		if (b.getName().equals(INDEX_BINDING_NAME)) {
			continue;
		}
		res.addBinding(b);
	}
	for (Binding bs : bindings.get(bIndex)) {
		res.setBinding(bs);
	}
	return res;
}
 

public static BindingSet project(ProjectionElemList projElemList, BindingSet sourceBindings,
		BindingSet parentBindings, boolean includeAllParentBindings) {
	final QueryBindingSet resultBindings = new QueryBindingSet();
	if (includeAllParentBindings) {
		resultBindings.addAll(parentBindings);
	}

	for (ProjectionElem pe : projElemList.getElements()) {
		Value targetValue = sourceBindings.getValue(pe.getSourceName());
		if (!includeAllParentBindings && targetValue == null) {
			targetValue = parentBindings.getValue(pe.getSourceName());
		}
		if (targetValue != null) {
			resultBindings.setBinding(pe.getTargetName(), targetValue);
		}
	}

	return resultBindings;
}
 

private Iterator<BindingSet> createIterator() throws QueryEvaluationException {
	Collection<Entry> entries = buildEntries();
	Set<BindingSet> bindingSets = createSet("bindingsets");

	for (Entry entry : entries) {
		QueryBindingSet sol = new QueryBindingSet(parentBindings);

		for (String name : group.getGroupBindingNames()) {
			BindingSet prototype = entry.getPrototype();
			if (prototype != null) {
				Value value = prototype.getValue(name);
				if (value != null) {
					// Potentially overwrites bindings from super
					sol.setBinding(name, value);
				}
			}
		}

		entry.bindSolution(sol);

		bindingSets.add(sol);
	}

	return bindingSets.iterator();
}
 

public static BindingSet project(ProjectionElemList projElemList,
                                 BindingSet sourceBindings,
                                 BindingSet parentBindings)
{
    QueryBindingSet resultBindings = new QueryBindingSet(parentBindings);

    for (ProjectionElem pe : projElemList.getElements()) {
        Value targetValue = sourceBindings.getValue(pe.getSourceName());
        if (targetValue != null) {
            // Potentially overwrites bindings from super
            resultBindings.setBinding(pe.getTargetName(), targetValue);
        }
    }

    return resultBindings;
}
 

public void bindSolution(QueryBindingSet sol) throws QueryEvaluationException {
    Iterator i$ = this.aggregates.keySet().iterator();

    while(i$.hasNext()) {
        String name = (String)i$.next();

        try {
            Value ex = ((Aggregate)this.aggregates.get(name)).getValue();
            if(ex != null) {
                sol.setBinding(name, ex);
            }
        } catch (ValueExprEvaluationException var5) {
            ;
        }
    }

}
 

@Override
protected BindingSet convert(BindingSet bIn) throws QueryEvaluationException {
	QueryBindingSet res = new QueryBindingSet();
	int bIndex = Integer.parseInt(bIn.getBinding(INDEX_BINDING_NAME).getValue().stringValue());
	Iterator<Binding> bIter = bIn.iterator();
	while (bIter.hasNext()) {
		Binding b = bIter.next();
		if (b.getName().equals(INDEX_BINDING_NAME))
			continue;
		res.addBinding(b);
	}
	for (Binding bs : bindings.get(bIndex))
		res.setBinding(bs);
	return res;
}
 

@Override
public BindingSet convert(BindingSet sourceBindings) throws QueryEvaluationException {
	QueryBindingSet targetBindings = new QueryBindingSet(sourceBindings);

	for (ExtensionElem extElem : extension.getElements()) {
		ValueExpr expr = extElem.getExpr();
		if (!(expr instanceof AggregateOperator)) {
			try {
				// we evaluate each extension element over the targetbindings, so that bindings from
				// a previous extension element in this same extension can be used by other extension elements.
				// e.g. if a projection contains (?a + ?b as ?c) (?c * 2 as ?d)
				Value targetValue = strategy.evaluate(extElem.getExpr(), targetBindings);

				if (targetValue != null) {
					// Potentially overwrites bindings from super
					targetBindings.setBinding(extElem.getName(), targetValue);
				}
			} catch (ValueExprEvaluationException e) {
				// silently ignore type errors in extension arguments. They should not cause the
				// query to fail but result in no bindings for this solution
				// see https://www.w3.org/TR/sparql11-query/#assignment
				// use null as place holder for unbound variables that must remain so
				targetBindings.setBinding(extElem.getName(), null);
			}
		}
	}

	return targetBindings;
}
 

public void bindSolution(QueryBindingSet sol) throws QueryEvaluationException {
	for (String name : getAggregates().keySet()) {
		try {
			Value value = getAggregates().get(name).getValue();
			if (value != null) {
				// Potentially overwrites bindings from super
				sol.setBinding(name, value);
			}
		} catch (ValueExprEvaluationException ex) {
			// There was a type error when calculating the value of the aggregate. We silently ignore the error,
			// resulting in no result value being bound.
		}
	}
}
 

public static BindingSet extend(EvaluationStrategy strategy, Collection<ExtensionElem> extElems, BindingSet sourceBindings)
        throws QueryEvaluationException
{
    QueryBindingSet targetBindings = new QueryBindingSet(sourceBindings);

    for (ExtensionElem extElem : extElems) {
        ValueExpr expr = extElem.getExpr();
        if (!(expr instanceof AggregateOperator)) {
            try {
                // we evaluate each extension element over the targetbindings, so that bindings from
                // a previous extension element in this same extension can be used by other extension elements.
                // e.g. if a projection contains (?a + ?b as ?c) (?c * 2 as ?d)
                Value targetValue = strategy.evaluate(extElem.getExpr(), targetBindings);

                if (targetValue != null) {
                    // Potentially overwrites bindings from super
                    targetBindings.setBinding(extElem.getName(), targetValue);
                }
            } catch (ValueExprEvaluationException e) {
                // silently ignore type errors in extension arguments. They should not cause the
                // query to fail but just result in no additional binding.
            }
        }
    }

    return targetBindings;
}