org.apache.commons.jxpath.ri.axes

Class PredicateContext

Implemented Interfaces:
ExpressionContext, Iterator

public class PredicateContext
extends EvalContext

EvalContext that checks predicates.
Version:
$Revision: 1.22 $ $Date: 2004/02/29 14:17:37 $
Author:
Dmitri Plotnikov

Field Summary

Fields inherited from class org.apache.commons.jxpath.ri.EvalContext

parentContext, position, rootContext

Constructor Summary

PredicateContext(EvalContext parentContext, Expression expression)

Method Summary

NodePointer
getCurrentNodePointer()
Returns the current context node.
boolean
nextNode()
Returns true if there is another object in the current set.
boolean
nextSet()
Returns true if there is another sets of objects to interate over.
void
reset()
Sets current position = 0, which is the pre-iteration state.
boolean
setPosition(int position)
Moves the current position to the specified index.

Methods inherited from class org.apache.commons.jxpath.ri.EvalContext

getContextNodeList, getContextNodePointer, getCurrentNodePointer, getCurrentPosition, getDocumentOrder, getJXPathContext, getNodeSet, getPosition, getRootContext, getSingleNodePointer, getValue, hasNext, isChildOrderingRequired, next, nextNode, nextSet, remove, reset, setPosition, toString

Constructor Details

PredicateContext

public PredicateContext(EvalContext parentContext,
                        Expression expression)

Method Details

getCurrentNodePointer

public NodePointer getCurrentNodePointer()
Returns the current context node. Undefined before the beginning of the iteration.
Overrides:
getCurrentNodePointer in interface EvalContext

nextNode

public boolean nextNode()
Returns true if there is another object in the current set. Switches the current position and node to the next object.
Overrides:
nextNode in interface EvalContext

nextSet

public boolean nextSet()
Returns true if there is another sets of objects to interate over. Resets the current position and node.
Overrides:
nextSet in interface EvalContext

reset

public void reset()
Sets current position = 0, which is the pre-iteration state.
Overrides:
reset in interface EvalContext

setPosition

public boolean setPosition(int position)
Moves the current position to the specified index. Used with integer predicates to quickly get to the n'th element of the node set. Returns false if the position is out of the node set range. You can call it with 0 as the position argument to restart the iteration.
Overrides:
setPosition in interface EvalContext