org.apache.commons.jxpath.ri.axes
Class ChildContext

java.lang.Object
  org.apache.commons.jxpath.ri.EvalContext
      org.apache.commons.jxpath.ri.axes.ChildContext

All Implemented Interfaces:

ExpressionContext, java.util.Iterator

public class ChildContext

extends EvalContext

EvalContext that can walk the "child::", "following-sibling::" and "preceding-sibling::" axes.

Version:

$Revision: 1.16 $ $Date: 2004/03/25 03:49:50 $

Author:

Dmitri Plotnikov

Field Summary

private NodeIterator	iterator
private NodeTest	nodeTest
private boolean	reverse
private boolean	startFromParentLocation

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

parentContext, position, rootContext

Constructor Summary

ChildContext(EvalContext parentContext, NodeTest nodeTest, boolean startFromParentLocation, boolean reverse)

Method Summary

NodePointer	getCurrentNodePointer() Returns the current context node.
Pointer	getSingleNodePointer() This method is called on the last context on the path when only one value is needed.
boolean	nextNode() Returns true if there is another object in the current set.
private void	prepare() Allocates a PropertyIterator.
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, getCurrentPosition, getDocumentOrder, getJXPathContext, getNodeSet, getPosition, getRootContext, getValue, hasNext, isChildOrderingRequired, next, nextSet, remove, toString

Methods inherited from class java.lang.Object

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

Field Detail

nodeTest

private NodeTest nodeTest

startFromParentLocation

private boolean startFromParentLocation

reverse

private boolean reverse

iterator

private NodeIterator iterator

Constructor Detail

ChildContext

public ChildContext(EvalContext parentContext,
                    NodeTest nodeTest,
                    boolean startFromParentLocation,
                    boolean reverse)

Method Detail

getCurrentNodePointer

public NodePointer getCurrentNodePointer()

Description copied from class: EvalContext

Returns the current context node. Undefined before the beginning of the iteration.

Specified by:

getCurrentNodePointer in class EvalContext

getSingleNodePointer

public Pointer getSingleNodePointer()

This method is called on the last context on the path when only one value is needed. Note that this will return the whole property, even if it is a collection. It will not extract the first element of the collection. For example, "books" will return the collection of books rather than the first book from that collection.

Overrides:

getSingleNodePointer in class EvalContext

nextNode

public boolean nextNode()

Description copied from class: EvalContext

Returns true if there is another object in the current set. Switches the current position and node to the next object.

Specified by:

nextNode in class EvalContext

reset

public void reset()

Description copied from class: EvalContext

Sets current position = 0, which is the pre-iteration state.

Overrides:

reset in class EvalContext

setPosition

public boolean setPosition(int position)

Description copied from class: EvalContext

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 class EvalContext

prepare

private void prepare()

Allocates a PropertyIterator.