lux.compiler
Class SlopCounter

java.lang.Object
  lux.xpath.ExpressionVisitor
      lux.xpath.ExpressionVisitorBase
          lux.compiler.SlopCounter

public class SlopCounter
extends ExpressionVisitorBase

adds up the number of wildcard ("*" or node()) path steps on the left or right-hand side of a path; descendant axis steps count as an infinite number of wildcard steps. The path distance underlying this function expresses the "vertical" distance between two sets of nodes. This is really only defined for expressions separated by some combination of self, child, and descendant steps, and it counts the number of wildcard (*, node()) steps.

Constructor Summary

SlopCounter()

Method Summary

Integer	getSlop()
boolean	isDone()
void	reset() reset back to the initial state so the counter may be reused.
AbstractExpression	visit(BinaryOperation exp)
AbstractExpression	visit(FunCall f)
AbstractExpression	visit(PathStep step)
AbstractExpression	visit(Root root)
AbstractExpression	visit(Sequence seq)

Methods inherited from class lux.xpath.ExpressionVisitorBase

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitDefault, visitSubs

Methods inherited from class lux.xpath.ExpressionVisitor

isReverse, setReverse

Methods inherited from class java.lang.Object

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

Constructor Detail

SlopCounter

public SlopCounter()

Method Detail

reset

public void reset()

reset back to the initial state so the counter may be reused.

visit

public AbstractExpression visit(Root root)

Overrides:

visit in class ExpressionVisitorBase

visit

public AbstractExpression visit(PathStep step)

Overrides:

visit in class ExpressionVisitorBase

visit

public AbstractExpression visit(FunCall f)

Overrides:

visit in class ExpressionVisitorBase

visit

public AbstractExpression visit(Sequence seq)

Overrides:

visit in class ExpressionVisitorBase

visit

public AbstractExpression visit(BinaryOperation exp)

Overrides:

visit in class ExpressionVisitorBase

getSlop

public Integer getSlop()

isDone

public boolean isDone()

Overrides:

isDone in class ExpressionVisitor

Returns:

true if the visit is done; this allows visits to terminate early