org.basex.query.xpath.locpath
Class PredSimple

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

public final class PredSimple
extends Pred

XPath predicate.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Tim Petrowsky

Method Summary

Expr	indexEquivalent(XPContext ctx, Step step) For predicate optimization.
int	indexSizes(XPContext ctx, Step curr, int min) 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)
                     throws EvalException

Description copied from class: Pred

For predicate optimization.

Parameters:

ctx - root

step - location step

Returns:

Equivalent index-expression or null

Throws:

EvalException - evaluation exception

indexSizes

public int indexSizes(XPContext ctx,
                      Step curr,
                      int min)

Description copied from class: Pred

For predicate optimization.

Parameters:

ctx - root

curr - the location step

min - 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