org.apache.xpath.axes
Class DescendantWalker

java.lang.Object
  |
  +--org.apache.xpath.Expression
        |
        +--org.apache.xpath.patterns.NodeTest
              |
              +--org.apache.xpath.axes.PredicatedNodeTest
                    |
                    +--org.apache.xpath.axes.AxesWalker
                          |
                          +--org.apache.xpath.axes.DescendantWalker

Direct Known Subclasses:

DescendantOrSelfWalker

public class DescendantWalker

extends AxesWalker

Walker for the 'descendant' axes.

See Also:

XPath axes descriptions, Serialized Form

Fields inherited from class org.apache.xpath.axes.AxesWalker

FEATURE_NODETESTFILTER

Fields inherited from class org.apache.xpath.patterns.NodeTest

SCORE_NODETEST, SCORE_NONE, SCORE_NSWILD, SCORE_OTHER, SCORE_QNAME, SHOW_BYFUNCTION, SHOW_NAMESPACE, SUPPORTS_PRE_STRIPPING, WILD

Constructor Summary

DescendantWalker(LocPathIterator locPathIterator)
Construct an DescendantWalker using a LocPathIterator.

Method Summary

Node	firstChild() Moves the TreeWalker to the first visible child of the current node, and returns the new node.
Node	nextSibling() Moves the TreeWalker to the next sibling of the current node, and returns the new node.
Node	parentNode() Moves to and returns the closest visible ancestor node of the current node.
void	setRoot(Node root) Set the root node of the TreeWalker.

Methods inherited from class org.apache.xpath.axes.AxesWalker

canTraverseOutsideSubtree, clone, getCurrentNode, getExpandEntityReferences, getFilter, getLastPos, getNextWalker, getPrevWalker, getRoot, init, lastChild, nextNode, previousNode, previousSibling, setCurrentNode, setNextWalker, setPrevWalker, toString

Methods inherited from class org.apache.xpath.axes.PredicatedNodeTest

acceptNode, getLocPathIterator, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, initProximityPosition, isReverseAxes, resetProximityPositions, setLocPathIterator, setPredicateCount

Methods inherited from class org.apache.xpath.patterns.NodeTest

debugWhatToShow, execute, execute, getDefaultScore, getLocalName, getNamespace, getWhatToShow, initNodeTest, initNodeTest

Methods inherited from class org.apache.xpath.Expression

assert, error, setSourceLocator, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

DescendantWalker

public DescendantWalker(LocPathIterator locPathIterator)

Construct an DescendantWalker using a LocPathIterator.

Parameters:

locPathIterator - The location path iterator that 'owns' this walker.

Method Detail

setRoot

public void setRoot(Node root)

Set the root node of the TreeWalker.

Parameters:

root - The context node of this step.

Overrides:

setRoot in class AxesWalker

parentNode

public Node parentNode()

Moves to and returns the closest visible ancestor node of the current node. If the search for parentNode attempts to step upward from the TreeWalker's root node, or if it fails to find a visible ancestor node, this method retains the current position and returns null.

Returns:

The new parent node, or null if the current node has no parent in the TreeWalker's logical view.

Overrides:

parentNode in class AxesWalker

firstChild

public Node firstChild()

Moves the TreeWalker to the first visible child of the current node, and returns the new node. If the current node has no visible children, returns null , and retains the current node.

Returns:

The new node, or null if the current node has no visible children in the TreeWalker's logical view.

Overrides:

firstChild in class AxesWalker

nextSibling

public Node nextSibling()

Moves the TreeWalker to the next sibling of the current node, and returns the new node. If the current node has no visible next sibling, returns null , and retains the current node.

Returns:

The new node, or null if the current node has no next sibling in the TreeWalker's logical view.

Overrides:

nextSibling in class AxesWalker