org.apache.xpath.axes
Class HasPositionalPredChecker

java.lang.Object
  |
  +--org.apache.xpath.XPathVisitor
        |
        +--org.apache.xpath.axes.HasPositionalPredChecker

public class HasPositionalPredChecker
extends XPathVisitor


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

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.
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.
Overrides:
visitFunction in class XPathVisitor

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.
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.
Overrides:
visitPredicate in class XPathVisitor


Copyright 2006 Apache XML Project. All Rights Reserved.