Class GroupValuesAndNpsInUnionBranchTransform

java.lang.Object

org.eclipse.rdf4j.queryrender.sparql.ir.util.transform.BaseTransform

org.eclipse.rdf4j.queryrender.sparql.ir.util.transform.GroupValuesAndNpsInUnionBranchTransform

public final class GroupValuesAndNpsInUnionBranchTransform
extends BaseTransform

Stabilize rendering for UNION branches that combine a top-level VALUES clause with a negated property set path triple by preserving an extra grouping block around the branch content. Rationale: path/NPS rewrites often eliminate an intermediate FILTER or JOIN that caused the RDF4J algebra to mark a new variable scope. Tests expecting textual stability want the extra braces to persist (e.g., "{ { VALUES ... ?s !(...) ?o . } } UNION { ... }"). Heuristic (conservative): inside an explicit UNION branch (new scope), if the branch has a top-level IrValues and also a top-level negated-path triple (IrPathTriple with path starting with '!' or '!^'), wrap the entire branch lines in an inner IrBGP, resulting in double braces when printed by IrUnion.

Field Summary

Fields inherited from class BaseTransform

ANON_PATH_INVERSE_PREFIX, ANON_PATH_PREFIX

Method Summary

Modifier and Type	Method	Description
static IrBGP	apply(IrBGP bgp)

Methods inherited from class BaseTransform

bgpWithLines, branchHasAnonPathBridge, copyAllExcept, fuseAdjacentPtThenPt, fuseAdjacentSpThenPt, fuseAltInverseTailBGP, fusePtSpPtSequence, invertNegatedPropertySet, iri, isAnonPathInverseVar, isAnonPathVar, isConstantIriPredicate, joinPathWithLaterSp, mergeNpsMembers, normalizeCompactNps, orientBareNpsForNext, rewriteContainers, sameVar, sameVarOrValue, unionBranchesAllHaveAnonPathBridge, unionBranchesShareAnonPathVarWithAllowedRoleMapping, unionBranchesShareCommonAnonPathVarName, unionIsExplicitAndAllBranchesScoped, varOrValue

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

apply

public static IrBGP apply(IrBGP bgp)