org.basex.query.xpath.locpath
Class PredPos

java.lang.Object
  org.basex.query.xpath.locpath.Pred
      org.basex.query.xpath.locpath.PredPos

public final class PredPos
extends Pred

Position predicate.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Christian Gruen

Method Summary

Expr	indexEquivalent(XPContext ctx, Step step) For predicate optimization.
int	indexSizes(XPContext r, Step c, int m) For predicate optimization.
boolean	sameAs(Pred pred) Compares the predicate for equality.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

indexEquivalent

public Expr indexEquivalent(XPContext ctx,
                            Step step)

Description copied from class: Pred

For predicate optimization.

Parameters:

ctx - root

step - location step

Returns:

Equivalent index-expression or null

indexSizes

public int indexSizes(XPContext r,
                      Step c,
                      int m)

Description copied from class: Pred

For predicate optimization.

Parameters:

r - root

c - the location step

m - current minimum size

Returns:

Equivalent index-expression or null

sameAs

public boolean sameAs(Pred pred)

Description copied from class: Pred

Compares the predicate for equality.

Parameters:

pred - predicate to be compared

Returns:

result of check

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object