Module org.apache.jena.arq

Package org.apache.jena.sparql.engine

Class Rename

java.lang.Object

org.apache.jena.sparql.engine.Rename

public class Rename
extends Object

Support for renaming all the variables in an algebra expression. This is primarily in support of renaming variables based on sub-query scope where renaming ?x -> ?/x happens to stop global clashes of scoped usages.

For syntax-base renaming, see QueryTransformOps and UpdateTransformOps.

Constructor Summary

Constructors

Constructor	Description
Rename()

Method Summary

Modifier and Type	Method	Description
static Var	chooseVarName(Var var, Collection<Var> inUse, String prefix)	Given an old name, and some names already in use, pick a fresh, new name
static Op	renameNode(Op op, org.apache.jena.graph.Node oldName, org.apache.jena.graph.Node newName)	Rename one node to another
static Op	renameVar(Op op, Var oldName, Var newName)	Rename one variable to another
static Op	renameVars(Op op, Collection<Var> constants)	Rename all variables in a pattern, EXCEPT for those named as constant
static ExprList	renameVars(ExprList exprList, Set<Var> constants)	Rename all variables in an expression, EXCEPT for those named as constant
static Expr	renameVars(Expr expr, Set<Var> constants)
static org.apache.jena.graph.Node	reverseVarRename(org.apache.jena.graph.Node node)	Undo the effect of the rename operation, once or repeatedly.
static Op	reverseVarRename(Op op, boolean repeatedly)	Undo the effect of the rename operation, once or repeatedly.

Methods inherited from class java.lang.Object

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

Constructor Details

Rename

public Rename()

Method Details

chooseVarName

public static Var chooseVarName(Var var,
 Collection<Var> inUse,
 String prefix)

Given an old name, and some names already in use, pick a fresh, new name

renameNode

public static Op renameNode(Op op,
 org.apache.jena.graph.Node oldName,
 org.apache.jena.graph.Node newName)

Rename one node to another

renameVar

public static Op renameVar(Op op,
 Var oldName,
 Var newName)

Rename one variable to another

renameVars

public static Op renameVars(Op op,
 Collection<Var> constants)

Rename all variables in a pattern, EXCEPT for those named as constant

renameVars

public static ExprList renameVars(ExprList exprList,
 Set<Var> constants)

Rename all variables in an expression, EXCEPT for those named as constant

renameVars

public static Expr renameVars(Expr expr,
 Set<Var> constants)

reverseVarRename

public static Op reverseVarRename(Op op,
 boolean repeatedly)

Undo the effect of the rename operation, once or repeatedly. This assumes the op was renamed by VarRename.rename

reverseVarRename

public static org.apache.jena.graph.Node reverseVarRename(org.apache.jena.graph.Node node)

Undo the effect of the rename operation, once or repeatedly. This assumes the node was renamed by VarRename.rename