Java Code Examples for org.eclipse.rdf4j.query.algebra.Union#setLeftArg()
The following examples show how to use
org.eclipse.rdf4j.query.algebra.Union#setLeftArg() .
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Example 1
| Source File: QueryAlgebraUtil.java From CostFed with GNU Affero General Public License v3.0 | 6 votes |
|
/**
* Construct a SELECT query for a grouped bound check.
*
* Pattern:
*
* SELECT DISTINCT ?o_1 .. ?o_N WHERE { { s1 p1 ?o_1 FILTER ?o_1=o1 } UNION ... UNION { sN pN ?o_N FILTER ?o_N=oN }}
*
* @param stmt
* @param unionBindings
* @return
*/
public static TupleExpr selectQueryStringBoundCheck(StatementPattern stmt, List<BindingSet> unionBindings) {
Set<String> varNames = new HashSet<String>();
Union union = new Union();
union.setLeftArg(constructStatementCheckId(stmt, 0, varNames, unionBindings.get(0)) );
Union tmp = union;
int idx;
for (idx=1; idx<unionBindings.size()-1; idx++) {
Union _u = new Union();
_u.setLeftArg( constructStatementCheckId(stmt, idx, varNames, unionBindings.get(idx)) );
tmp.setRightArg(_u);
tmp = _u;
}
tmp.setRightArg( constructStatementCheckId(stmt, idx, varNames, unionBindings.get(idx) ));
ProjectionElemList projList = new ProjectionElemList();
for (String var : varNames)
projList.addElement( new ProjectionElem(var));
Projection proj = new Projection(union, projList);
return proj;
}
Example 2
| Source File: QueryAlgebraUtil.java From CostFed with GNU Affero General Public License v3.0 | 6 votes |
|
protected static Union constructInnerUnion(StatementPattern stmt, int outerID, Set<String> varNames, List<BindingSet> bindings) {
Union union = new Union();
union.setLeftArg(constructStatementId(stmt, outerID + "_0", varNames, bindings.get(0)) );
Union tmp = union;
int idx;
for (idx=1; idx<bindings.size()-1; idx++) {
Union _u = new Union();
_u.setLeftArg( constructStatementId(stmt, outerID + "_" + idx, varNames, bindings.get(idx)) );
tmp.setRightArg(_u);
tmp = _u;
}
tmp.setRightArg( constructStatementId(stmt, outerID + "_" + idx, varNames, bindings.get(idx)));
return union;
}
Example 3
| Source File: QueryAlgebraUtil.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 6 votes |
|
/**
* Construct a SELECT query for a grouped bound check.
*
* Pattern:
*
* SELECT DISTINCT ?o_1 .. ?o_N WHERE { { s1 p1 ?o_1 FILTER ?o_1=o1 } UNION ... UNION { sN pN ?o_N FILTER ?o_N=oN }}
*
* @param stmt
* @param unionBindings
* @return the SELECT query
*/
public static TupleExpr selectQueryStringBoundCheck(StatementPattern stmt, List<BindingSet> unionBindings) {
Set<String> varNames = new HashSet<>();
Union union = new Union();
union.setLeftArg(constructStatementCheckId(stmt, 0, varNames, unionBindings.get(0)));
Union tmp = union;
int idx;
for (idx = 1; idx < unionBindings.size() - 1; idx++) {
Union _u = new Union();
_u.setLeftArg(constructStatementCheckId(stmt, idx, varNames, unionBindings.get(idx)));
tmp.setRightArg(_u);
tmp = _u;
}
tmp.setRightArg(constructStatementCheckId(stmt, idx, varNames, unionBindings.get(idx)));
ProjectionElemList projList = new ProjectionElemList();
for (String var : varNames) {
projList.addElement(new ProjectionElem(var));
}
Projection proj = new Projection(union, projList);
return proj;
}
Example 4
| Source File: QueryAlgebraUtil.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 6 votes |
|
protected static Union constructInnerUnion(StatementPattern stmt, int outerID, Set<String> varNames,
List<BindingSet> bindings) {
Union union = new Union();
union.setLeftArg(constructStatementId(stmt, outerID + "_0", varNames, bindings.get(0)));
Union tmp = union;
int idx;
for (idx = 1; idx < bindings.size() - 1; idx++) {
Union _u = new Union();
_u.setLeftArg(constructStatementId(stmt, outerID + "_" + idx, varNames, bindings.get(idx)));
tmp.setRightArg(_u);
tmp = _u;
}
tmp.setRightArg(constructStatementId(stmt, outerID + "_" + idx, varNames, bindings.get(idx)));
return union;
}
Example 5
| Source File: IterativeEvaluationOptimizer.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 6 votes |
|
@Override
public void meet(Union union) {
super.meet(union);
TupleExpr leftArg = union.getLeftArg();
TupleExpr rightArg = union.getRightArg();
if (leftArg instanceof Join && rightArg instanceof Join) {
Join leftJoinArg = (Join) leftArg;
Join rightJoin = (Join) rightArg;
if (leftJoinArg.getLeftArg().equals(rightJoin.getLeftArg())) {
// factor out the left-most join argument
Join newJoin = new Join();
union.replaceWith(newJoin);
newJoin.setLeftArg(leftJoinArg.getLeftArg());
newJoin.setRightArg(union);
union.setLeftArg(leftJoinArg.getRightArg());
union.setRightArg(rightJoin.getRightArg());
union.visit(this);
}
}
}
Example 6
| Source File: QueryAlgebraUtil.java From CostFed with GNU Affero General Public License v3.0 | 5 votes |
|
/**
* Construct a SELECT query expression for a bound union.
*
* Pattern:
*
* SELECT ?v_1 ?v_2 ?v_N WHERE { { ?v_1 p o } UNION { ?v_2 p o } UNION ... }
*
* Note that the filterExpr is not evaluated at the moment.
*
* @param stmt
* @param unionBindings
* @param filterExpr
* @param evaluated
* parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning
*
* @return
*/
public static TupleExpr selectQueryBoundUnion( StatementPattern stmt, List<BindingSet> unionBindings, FilterValueExpr filterExpr, Boolean evaluated) {
// TODO add FILTER expressions
Set<String> varNames = new HashSet<String>();
Union union = new Union();
union.setLeftArg(constructStatementId(stmt, Integer.toString(0), varNames, unionBindings.get(0)) );
Union tmp = union;
int idx;
for (idx=1; idx<unionBindings.size()-1; idx++) {
Union _u = new Union();
_u.setLeftArg( constructStatementId(stmt, Integer.toString(idx), varNames, unionBindings.get(idx)) );
tmp.setRightArg(_u);
tmp = _u;
}
tmp.setRightArg( constructStatementId(stmt, Integer.toString(idx), varNames, unionBindings.get(idx) ));
ProjectionElemList projList = new ProjectionElemList();
for (String var : varNames)
projList.addElement( new ProjectionElem(var));
Projection proj = new Projection(union, projList);
return proj;
}
Example 7
| Source File: QueryAlgebraUtil.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
/**
* Construct a SELECT query expression for a bound union.
*
* Pattern:
*
* SELECT ?v_1 ?v_2 ?v_N WHERE { { ?v_1 p o } UNION { ?v_2 p o } UNION ... }
*
* Note that the filterExpr is not evaluated at the moment.
*
* @param stmt
* @param unionBindings
* @param filterExpr
* @param evaluated parameter can be used outside this method to check whether FILTER has been evaluated, false
* in beginning
*
* @return the SELECT query
*/
public static TupleExpr selectQueryBoundUnion(StatementPattern stmt, List<BindingSet> unionBindings,
FilterValueExpr filterExpr, Boolean evaluated) {
// TODO add FILTER expressions
Set<String> varNames = new HashSet<>();
Union union = new Union();
union.setLeftArg(constructStatementId(stmt, Integer.toString(0), varNames, unionBindings.get(0)));
Union tmp = union;
int idx;
for (idx = 1; idx < unionBindings.size() - 1; idx++) {
Union _u = new Union();
_u.setLeftArg(constructStatementId(stmt, Integer.toString(idx), varNames, unionBindings.get(idx)));
tmp.setRightArg(_u);
tmp = _u;
}
tmp.setRightArg(constructStatementId(stmt, Integer.toString(idx), varNames, unionBindings.get(idx)));
ProjectionElemList projList = new ProjectionElemList();
for (String var : varNames) {
projList.addElement(new ProjectionElem(var));
}
Projection proj = new Projection(union, projList);
return proj;
}
Example 8
| Source File: QueryModelNormalizerTest.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
@Test
public void testNormalizeUnionWithEmptyLeft() {
Projection p = new Projection();
Union union = new Union();
SingletonSet s = new SingletonSet();
union.setLeftArg(new EmptySet());
union.setRightArg(s);
p.setArg(union);
subject.meet(union);
assertThat(p.getArg()).isEqualTo(s);
}
Example 9
| Source File: QueryModelNormalizerTest.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
@Test
public void testNormalizeUnionWithEmptyRight() {
Projection p = new Projection();
Union union = new Union();
SingletonSet s = new SingletonSet();
union.setRightArg(new EmptySet());
union.setLeftArg(s);
p.setArg(union);
subject.meet(union);
assertThat(p.getArg()).isEqualTo(s);
}
Example 10
| Source File: QueryModelNormalizerTest.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
/**
* @see https://github.com/eclipse/rdf4j/issues/1404
*/
@Test
public void testNormalizeUnionWithTwoSingletons() {
Projection p = new Projection();
Union union = new Union();
union.setRightArg(new SingletonSet());
union.setLeftArg(new SingletonSet());
p.setArg(union);
subject.meet(union);
assertThat(p.getArg()).isEqualTo(union);
}
Example 11
| Source File: TupleExprBuilder.java From rdf4j with BSD 3-Clause "New" or "Revised" License | 5 votes |
|
@Override
public Object visit(ASTPathAlternative pathAltNode, Object data) throws VisitorException {
int altCount = pathAltNode.jjtGetNumChildren();
if (altCount > 1) {
GraphPattern parentGP = graphPattern;
Union union = new Union();
Union currentUnion = union;
for (int i = 0; i < altCount - 1; i++) {
graphPattern = new GraphPattern(parentGP);
pathAltNode.jjtGetChild(i).jjtAccept(this, data);
TupleExpr arg = graphPattern.buildTupleExpr();
currentUnion.setLeftArg(arg);
if (i == altCount - 2) { // second-to-last item
graphPattern = new GraphPattern(parentGP);
pathAltNode.jjtGetChild(i + 1).jjtAccept(this, data);
arg = graphPattern.buildTupleExpr();
currentUnion.setRightArg(arg);
} else {
Union newUnion = new Union();
currentUnion.setRightArg(newUnion);
currentUnion = newUnion;
}
}
// when using union to execute path expressions, the scope does not not change
union.setVariableScopeChange(false);
parentGP.addRequiredTE(union);
graphPattern = parentGP;
} else {
pathAltNode.jjtGetChild(0).jjtAccept(this, data);
}
return null;
}
Example 12
| Source File: InverseOfVisitor.java From rya with Apache License 2.0 | 5 votes |
|
@Override
protected void meetSP(StatementPattern node) throws Exception {
StatementPattern sp = node.clone();
final Var predVar = sp.getPredicateVar();
IRI pred = (IRI) predVar.getValue();
String predNamespace = pred.getNamespace();
final Var objVar = sp.getObjectVar();
final Var cntxtVar = sp.getContextVar();
if (objVar != null &&
!RDF.NAMESPACE.equals(predNamespace) &&
!SESAME.NAMESPACE.equals(predNamespace) &&
!RDFS.NAMESPACE.equals(predNamespace)
&& !EXPANDED.equals(cntxtVar)) {
/**
*
* { ?a ?pred ?b .}\n" +
" UNION " +
" { ?b ?pred ?a }
*/
IRI predIri = (IRI) predVar.getValue();
IRI invPropIri = inferenceEngine.findInverseOf(predIri);
if (invPropIri != null) {
Var subjVar = sp.getSubjectVar();
Union union = new InferUnion();
union.setLeftArg(sp);
union.setRightArg(new StatementPattern(objVar, new Var(predVar.getName(), invPropIri), subjVar, cntxtVar));
node.replaceWith(union);
}
}
}
Example 13
| Source File: SymmetricPropertyVisitor.java From rya with Apache License 2.0 | 5 votes |
|
@Override
protected void meetSP(StatementPattern node) throws Exception {
StatementPattern sp = node.clone();
final Var predVar = sp.getPredicateVar();
IRI pred = (IRI) predVar.getValue();
String predNamespace = pred.getNamespace();
final Var objVar = sp.getObjectVar();
final Var cntxtVar = sp.getContextVar();
if (objVar != null &&
!RDF.NAMESPACE.equals(predNamespace) &&
!SESAME.NAMESPACE.equals(predNamespace) &&
!RDFS.NAMESPACE.equals(predNamespace)
&& !EXPANDED.equals(cntxtVar)) {
/**
*
* { ?a ?pred ?b .}\n" +
" UNION " +
" { ?b ?pred ?a }
*/
IRI symmPropIri = (IRI) predVar.getValue();
if(inferenceEngine.isSymmetricProperty(symmPropIri)) {
Var subjVar = sp.getSubjectVar();
Union union = new InferUnion();
union.setLeftArg(sp);
union.setRightArg(new StatementPattern(objVar, predVar, subjVar, cntxtVar));
node.replaceWith(union);
}
}
}
