Package 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:

java.util.Iterator, ExpressionContext

public class ChildContext
extends EvalContext

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

Version:

$Revision: 652903 $ $Date: 2008-05-02 15:46:32 -0500 (Fri, 02 May 2008) $

Field Summary

Fields

Modifier and Type	Field	Description
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

Constructors

Constructor	Description
ChildContext(EvalContext parentContext, NodeTest nodeTest, boolean startFromParentLocation, boolean reverse)	Create a new ChildContext.

Method Summary

Modifier and Type	Method	Description
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, sortPointers, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

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)

Create a new ChildContext.

Parameters:

parentContext - parent EvalContext

nodeTest - NodeTest

startFromParentLocation - whether to start from parent location

reverse - whether to iterate in 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

Returns:

NodePoiner

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

Returns:

Pointer

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

Returns:

boolean

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

Parameters:

position - to set

Returns:

boolean

prepare

private void prepare()

Allocates a PropertyIterator.