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

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

All Implemented Interfaces:

ExpressionContext, java.util.Iterator

public class DescendantContext

extends EvalContext

An EvalContext that walks the "descendant::" and "descendant-or-self::" axes.

Version:

$Revision: 1.16 $ $Date: 2004/02/29 14:17:38 $

Author:

Dmitri Plotnikov

Field Summary

private NodePointer	currentNodePointer
private static NodeTest	ELEMENT_NODE_TEST
private boolean	includeSelf
private NodeTest	nodeTest
private boolean	setStarted
private java.util.Stack	stack

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

parentContext, position, rootContext

Constructor Summary

DescendantContext(EvalContext parentContext, boolean includeSelf, NodeTest nodeTest)

Method Summary

NodePointer	getCurrentNodePointer() Returns the current context node.
boolean	isChildOrderingRequired() Even if this context has the natural ordering and therefore does not require collecting and sorting all nodes prior to returning them, such operation may be required for any child context.
private boolean	isRecursive() Checks if we are reentering a bean we have already seen and if so returns true to prevent infinite recursion.
boolean	nextNode() Returns true if there is another object in the current set.
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, getSingleNodePointer, getValue, hasNext, 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

setStarted

private boolean setStarted

stack

private java.util.Stack stack

currentNodePointer

private NodePointer currentNodePointer

includeSelf

private boolean includeSelf

ELEMENT_NODE_TEST

private static final NodeTest ELEMENT_NODE_TEST

Constructor Detail

DescendantContext

public DescendantContext(EvalContext parentContext,
                         boolean includeSelf,
                         NodeTest nodeTest)

Method Detail

isChildOrderingRequired

public boolean isChildOrderingRequired()

Description copied from class: EvalContext

Even if this context has the natural ordering and therefore does not require collecting and sorting all nodes prior to returning them, such operation may be required for any child context.

Overrides:

isChildOrderingRequired in class EvalContext

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

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

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

isRecursive

private boolean isRecursive()

Checks if we are reentering a bean we have already seen and if so returns true to prevent infinite recursion.