org.apache.xpath.axes
Class HasPositionalPredChecker

java.lang.Object
  org.apache.xpath.XPathVisitor
      org.apache.xpath.axes.HasPositionalPredChecker

public class HasPositionalPredChecker
extends XPathVisitor

Field Summary

private boolean	m_hasPositionalPred
private int	m_predDepth

Constructor Summary

HasPositionalPredChecker()

Method Summary

static boolean	check(LocPathIterator path) Process the LocPathIterator to see if it contains variables or functions that may make it context dependent.
boolean	visitFunction(ExpressionOwner owner, Function func) Visit a function.
boolean	visitPredicate(ExpressionOwner owner, Expression pred) Visit a predicate within a location path.

Methods inherited from class org.apache.xpath.XPathVisitor

visitBinaryOperation, visitLocationPath, visitMatchPattern, visitNumberLiteral, visitStep, visitStringLiteral, visitUnaryOperation, visitUnionPath, visitUnionPattern, visitVariableRef

Methods inherited from class java.lang.Object

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

Field Detail

m_hasPositionalPred

private boolean m_hasPositionalPred

m_predDepth

private int m_predDepth

Constructor Detail

HasPositionalPredChecker

public HasPositionalPredChecker()

Method Detail

check

public static boolean check(LocPathIterator path)

Process the LocPathIterator to see if it contains variables or functions that may make it context dependent.

Parameters:

path - LocPathIterator that is assumed to be absolute, but needs checking.

Returns:

true if the path is confirmed to be absolute, false if it may contain context dependencies.

visitFunction

public boolean visitFunction(ExpressionOwner owner,
                             Function func)

Visit a function.

Overrides:

visitFunction in class XPathVisitor

Parameters:

owner - The owner of the expression, to which the expression can be reset if rewriting takes place.

func - The function reference object.

Returns:

true if the sub expressions should be traversed.

visitPredicate

public boolean visitPredicate(ExpressionOwner owner,
                              Expression pred)

Visit a predicate within a location path. Note that there isn't a proper unique component for predicates, and that the expression will be called also for whatever type Expression is.

Overrides:

visitPredicate in class XPathVisitor

Parameters:

owner - The owner of the expression, to which the expression can be reset if rewriting takes place.

pred - The predicate object.

Returns:

true if the sub expressions should be traversed.