private void addSourceExpressions(UnaryTupleOperator op, Collection<ProjectionElem> elems) { Extension ext = null; for (ProjectionElem projElem : elems) { ExtensionElem extElem = projElem.getSourceExpression(); if (extElem != null) { if (ext == null) { ext = new Extension(op.getArg()); op.setArg(ext); } ext.addElement(extElem); } } }
private void visitBind(Resource r) throws RDF4JException { Value expr = TripleSources.singleValue(r, SP.EXPRESSION_PROPERTY, store); ValueExpr valueExpr = visitExpression(expr); Value varValue = TripleSources.singleValue(r, SP.VARIABLE_PROPERTY, store); if (!(varValue instanceof Resource)) { throw new MalformedSpinException( String.format("Value of %s is not a resource", SP.VARIABLE_PROPERTY)); } String varName = getVarName((Resource)varValue); tupleNode = new Extension(tupleNode, new ExtensionElem(valueExpr, varName)); }
if (varsBefore.contains(name)) { UnaryTupleOperator proj = (UnaryTupleOperator)projElems.getParentNode(); Extension ext = new Extension(proj.getArg()); proj.setArg(ext); Var lostVar = new Var(name);
if (varsBefore.contains(name)) { UnaryTupleOperator proj = (UnaryTupleOperator)projElems.getParentNode(); Extension ext = new Extension(proj.getArg()); proj.setArg(ext); Var lostVar = new Var(name);
@Override public TupleExpr visit(ASTDescribe node, Object data) throws VisitorException { TupleExpr tupleExpr = (TupleExpr)data; if (tupleExpr == null) { tupleExpr = new SingletonSet(); } Extension e = new Extension(); ProjectionElemList projectionElements = new ProjectionElemList(); for (int i = 0; i < node.jjtGetNumChildren(); i++) { ValueExpr resource = (ValueExpr)node.jjtGetChild(i).jjtAccept(this, null); if (resource instanceof Var) { projectionElements.addElement(new ProjectionElem(((Var)resource).getName())); } else { String alias = "_describe_" + UUID.randomUUID().toString().replaceAll("-", "_"); ExtensionElem elem = new ExtensionElem(resource, alias); e.addElement(elem); projectionElements.addElement(new ProjectionElem(alias)); } } if (!e.getElements().isEmpty()) { e.setArg(tupleExpr); tupleExpr = e; } Projection p = new Projection(tupleExpr, projectionElements); return new DescribeOperator(p); }
@Override public TupleExpr visit(ASTDescribe node, Object data) throws VisitorException { TupleExpr tupleExpr = (TupleExpr)data; if (tupleExpr == null) { tupleExpr = new SingletonSet(); } Extension e = new Extension(); ProjectionElemList projectionElements = new ProjectionElemList(); for (int i = 0; i < node.jjtGetNumChildren(); i++) { ValueExpr resource = (ValueExpr)node.jjtGetChild(i).jjtAccept(this, null); if (resource instanceof Var) { projectionElements.addElement(new ProjectionElem(((Var)resource).getName())); } else { String alias = "_describe_" + UUID.randomUUID().toString().replaceAll("-", "_"); ExtensionElem elem = new ExtensionElem(resource, alias); e.addElement(elem); projectionElements.addElement(new ProjectionElem(alias)); } } if (!e.getElements().isEmpty()) { e.setArg(tupleExpr); tupleExpr = e; } Projection p = new Projection(tupleExpr, projectionElements); return new DescribeOperator(p); }
@Override public TupleExpr visit(ASTDescribe node, Object data) throws VisitorException { TupleExpr tupleExpr = (TupleExpr)data; if (tupleExpr == null) { tupleExpr = new SingletonSet(); } Extension e = new Extension(); ProjectionElemList projectionElements = new ProjectionElemList(); for (int i = 0; i < node.jjtGetNumChildren(); i++) { ValueExpr resource = (ValueExpr)node.jjtGetChild(i).jjtAccept(this, null); if (resource instanceof Var) { projectionElements.addElement(new ProjectionElem(((Var)resource).getName())); } else { String alias = "_describe_" + UUID.randomUUID().toString().replaceAll("-", "_"); ExtensionElem elem = new ExtensionElem(resource, alias); e.addElement(elem); projectionElements.addElement(new ProjectionElem(alias)); } } if (!e.getElements().isEmpty()) { e.setArg(tupleExpr); tupleExpr = e; } Projection p = new Projection(tupleExpr, projectionElements); return new DescribeOperator(p); }
private TupleExpr visitHaving(Resource having) throws RDF4JException { UnaryTupleOperator op = (UnaryTupleOperator)group.getParentNode(); op.setArg(new Extension(group)); Iteration<? extends Resource, QueryEvaluationException> iter = TripleSources.listResources(having, store); while (iter.hasNext()) { Resource r = iter.next(); ValueExpr havingExpr = visitExpression(r); Filter filter = new Filter(op.getArg(), havingExpr); op.setArg(filter); op = filter; } return op; }
private void renameVar(Var oldVar, Var newVar, Filter filter) { filter.getArg().visit(new VarRenamer(oldVar, newVar)); // TODO: skip this step if old variable name is not used // Replace SameTerm-filter with an Extension, the old variable name // might still be relevant to nodes higher in the tree Extension extension = new Extension(filter.getArg()); extension.addElement(new ExtensionElem(new Var(newVar.getName()), oldVar.getName())); filter.replaceWith(extension); }
private void renameVar(Var oldVar, Var newVar, Filter filter) { filter.getArg().visit(new VarRenamer(oldVar, newVar)); // TODO: skip this step if old variable name is not used // Replace SameTerm-filter with an Extension, the old variable name // might still be relevant to nodes higher in the tree Extension extension = new Extension(filter.getArg()); extension.addElement(new ExtensionElem(new Var(newVar.getName()), oldVar.getName())); filter.replaceWith(extension); }
Extension extension = new Extension(); ProjectionElemList projElemList = new ProjectionElemList();
collector.meet(orderElem); Extension extension = new Extension();
collector.meet(orderElem); Extension extension = new Extension();
collector.meet(orderElem); Extension extension = new Extension();
Extension extension = new Extension(); for (AggregateOperator operator : collector.getOperators()) { Var var = createAnonVar();
@Test public void testExtension() throws Exception { QueryRoot queryTree = new QueryRoot(new Extension( new StatementPattern(new Var("x"), constant(TAKES), new Var("c")), new ExtensionElem(new Var("x"), "renamed"), new ExtensionElem(new ValueConstant(TAKES), "constant"))); SparqlToPipelineTransformVisitor visitor = new SparqlToPipelineTransformVisitor(collection); queryTree.visit(visitor); Assert.assertTrue(queryTree.getArg() instanceof AggregationPipelineQueryNode); AggregationPipelineQueryNode pipelineNode = (AggregationPipelineQueryNode) queryTree.getArg(); Assert.assertEquals(Sets.newHashSet("x", "c", "renamed", "constant"), pipelineNode.getAssuredBindingNames()); }
@Test public void testUnsupportedExtension() throws Exception { StatementPattern sp = new StatementPattern(new Var("x"), constant(TAKES), new Var("c")); List<ExtensionElem> elements = Arrays.asList(new ExtensionElem(new Var("x"), "renamed"), new ExtensionElem(new Not(new ValueConstant(VF.createLiteral(true))), "notTrue"), new ExtensionElem(new ValueConstant(TAKES), "constant")); Extension extensionNode = new Extension(sp, elements); QueryRoot queryTree = new QueryRoot(extensionNode); SparqlToPipelineTransformVisitor visitor = new SparqlToPipelineTransformVisitor(collection); queryTree.visit(visitor); Assert.assertTrue(queryTree.getArg() instanceof Extension); Assert.assertEquals(elements, ((Extension) queryTree.getArg()).getElements()); TupleExpr innerQuery = ((Extension) queryTree.getArg()).getArg(); Assert.assertTrue(innerQuery instanceof AggregationPipelineQueryNode); AggregationPipelineQueryNode pipelineNode = (AggregationPipelineQueryNode) innerQuery; Assert.assertEquals(Sets.newHashSet("x", "c"), pipelineNode.getAssuredBindingNames()); } }