org.basex.query.xpath
Class XPOptimizer

java.lang.Object
  org.basex.query.xpath.XPOptimizer

public final class XPOptimizer
extends java.lang.Object

This class assembles optimization methods for the XPath parser.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen

Method Summary

static void	addText(Expr ex, XPContext ctx) Adds a text step to the specified path.
static Expr[]	getIndexExpr(Expr[] ex) Checks if all path expressions are the same; if yes, a path has to be only evaluated once.

Methods inherited from class java.lang.Object

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

Method Detail

getIndexExpr

public static Expr[] getIndexExpr(Expr[] ex)

Checks if all path expressions are the same; if yes, a path has to be only evaluated once.

Parameters:

ex - expression array

Returns:

result of check

addText

public static void addText(Expr ex,
                           XPContext ctx)

Adds a text step to the specified path.

Parameters:

ex - location path expression

ctx - query context