Java Code Examples for org.eclipse.rdf4j.query.algebra.Projection#setProjectionElemList()

The following examples show how to use org.eclipse.rdf4j.query.algebra.Projection#setProjectionElemList() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: SpinParser.java    From rdf4j with BSD 3-Clause "New" or "Revised" License 6 votes vote down vote up 
private Projection visitResultNodes(Resource resultNodes) throws RDF4JException {
	ProjectionElemList projElemList = new ProjectionElemList();
	Iteration<Resource, QueryEvaluationException> iter = TripleSources.listResources(resultNodes,
			store);
	while (iter.hasNext()) {
		Resource r = iter.next();
		ProjectionElem projElem = visitResultNode(r);
		projElemList.addElement(projElem);
	}

	Projection proj = new Projection();
	proj.setProjectionElemList(projElemList);

	tupleRoot = new DescribeOperator(proj);
	return proj;
}
Example 2
Source File: SpinParser.java    From rdf4j with BSD 3-Clause "New" or "Revised" License 6 votes vote down vote up 
private Projection visitResultVariables(Resource resultVars, Map<String, ProjectionElem> previousProjElems)
		throws RDF4JException {
	ProjectionElemList projElemList = new ProjectionElemList();
	Iteration<Resource, QueryEvaluationException> iter = TripleSources.listResources(resultVars,
			store);
	while (iter.hasNext()) {
		Resource r = iter.next();
		ProjectionElem projElem = visitResultVariable(r, previousProjElems);
		projElemList.addElement(projElem);
	}

	Projection proj = new Projection();
	proj.setProjectionElemList(projElemList);

	tupleRoot = proj;
	return proj;
}
Example 3
Source File: AbstractQueryBuilder.java    From rdf4j with BSD 3-Clause "New" or "Revised" License 6 votes vote down vote up 
private UnaryTupleOperator projection() {
	if (!mProjectionPatterns.isEmpty()) {
		return multiProjection();
	} else {
		Extension aExt = null;

		ProjectionElemList aList = new ProjectionElemList();

		for (String aVar : mProjectionVars) {
			aList.addElement(new ProjectionElem(aVar));
		}

		Projection aProjection = new Projection();
		aProjection.setProjectionElemList(aList);

		if (aExt != null) {
			aProjection.setArg(aExt);
		}

		return aProjection;
	}
}