Class FuseUnionOfSimpleTriplesTransform

java.lang.Object

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

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

public final class FuseUnionOfSimpleTriplesTransform
extends BaseTransform

Fuse a UNION whose branches are each a single simple triple (optionally inside the same GRAPH) into a single path alternation: ?s (p1|^p2|...) ?o . If branches are GRAPH-wrapped with identical graph var/IRI, the alternation is produced inside that GRAPH block. Scope/safety: - This transform only merges UNIONs that are NOT marked as introducing a new scope. We do not apply the new-scope special case here because these are not NPS branches, and there is no guarantee that the scope originates from parser-generated path bridges; being conservative avoids collapsing user-visible variables. - Each branch must be a single IrStatementPattern (or GRAPH with a single IrStatementPattern), endpoints must align (forward or inverse), and graph refs must match.

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, TupleExprIRRenderer r)

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,
 TupleExprIRRenderer r)