WebLogic Server 6.1 API Reference

weblogic.apache.xpath.axes
Class FilterExprWalker

java.lang.Object
  |
  +--weblogic.apache.xpath.Expression
        |
        +--weblogic.apache.xpath.patterns.NodeTest
              |
              +--weblogic.apache.xpath.axes.PredicatedNodeTest
                    |
                    +--weblogic.apache.xpath.axes.AxesWalker
                          |
                          +--weblogic.apache.xpath.axes.FilterExprWalker

public class FilterExprWalker

extends AxesWalker

Walker for the OP_VARIABLE, or OP_EXTFUNCTION, or OP_FUNCTION, or OP_GROUP, op codes.

This class is based on an implementation from the Apache XML Project. In future releases the XML parser, XSLT processor, and associated classes will likely be updated to be based on a later version of the Apache implementations. Since Apache does not guarantee backwards compatibility between versions of their software, we cannot guarantee backwards compatibility of any of the classes contained in the weblogic.apache package or sub-packages.

See Also:

XPath FilterExpr descriptions, Serialized Form

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

FEATURE_NODETESTFILTER, m_nextLevelAmount, m_nextWalker

Fields inherited from class weblogic.apache.xpath.axes.PredicatedNodeTest

m_lpi, m_proximityPositions

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

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

Fields inherited from class weblogic.apache.xpath.Expression

m_slocator

Constructor Summary

FilterExprWalker(LocPathIterator locPathIterator)
Construct a FilterExprWalker using a LocPathIterator.

Method Summary

short	acceptNode(org.w3c.dom.Node n) This method needs to override AxesWalker.acceptNode because FilterExprWalkers don't need to, and shouldn't, do a node test.
java.lang.Object	clone() Get a cloned FilterExprWalker.
protected int	getLevelMax() Tell what's the maximum level this axes can descend to (which is actually impossible to predict with this walker?).
org.w3c.dom.Node	getNextNode() Moves the TreeWalker to the next visible node in document order relative to the current node, and returns the new node.
void	init(Compiler compiler, int opPos, int stepType) Init a FilterExprWalker.
void	setRoot(org.w3c.dom.Node root) Set the root node of the TreeWalker.

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

canTraverseOutsideSubtree, checkOKToTraverse, firstChild, getArgLen, getCurrentNode, getExpandEntityReferences, getFilter, getLastPos, getNextLevelAmount, getNextWalker, getPrevWalker, getRoot, getStepType, isFastWalker, lastChild, nextNode, nextSibling, parentNode, previousNode, previousSibling, setCurrentIfNotNull, setCurrentNode, setNextWalker, setPrevWalker, toString

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

countProximityPosition, getLocPathIterator, getPredicateCount, getPredicateIndex, getProximityPosition, getProximityPosition, getProximityPosition, initPredicateInfo, initProximityPosition, isReverseAxes, nodeToString, resetProximityPositions, setLocPathIterator, setPredicateCount

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

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

Methods inherited from class weblogic.apache.xpath.Expression

assert, error, setSourceLocator, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterExprWalker

public FilterExprWalker(LocPathIterator locPathIterator)

Construct a FilterExprWalker using a LocPathIterator.

Parameters:

locPathIterator - non-null reference to the parent iterator.

Method Detail

init

public void init(Compiler compiler,
                 int opPos,
                 int stepType)
          throws javax.xml.transform.TransformerException

Init a FilterExprWalker.

Parameters:

compiler - non-null reference to the Compiler that is constructing.

opPos - positive opcode position for this step.

stepType - The type of step.

Throws:

javax.xml.transform.TransformerException -

Overrides:

init in class AxesWalker

setRoot

public void setRoot(org.w3c.dom.Node root)

Set the root node of the TreeWalker.

Parameters:

root - non-null reference to the root, or starting point of the query.

Overrides:

setRoot in class AxesWalker

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Get a cloned FilterExprWalker.

Returns:

A new FilterExprWalker that can be used without mutating this one.

Throws:

java.lang.CloneNotSupportedException -

Overrides:

clone in class AxesWalker

acceptNode

public short acceptNode(org.w3c.dom.Node n)

This method needs to override AxesWalker.acceptNode because FilterExprWalkers don't need to, and shouldn't, do a node test.

Parameters:

n - The node to check to see if it passes the filter or not.

Returns:

a constant to determine whether the node is accepted, rejected, or skipped, as defined above .

Overrides:

acceptNode in class PredicatedNodeTest

getNextNode

public org.w3c.dom.Node getNextNode()

Moves the TreeWalker to the next visible node in document order relative to the current node, and returns the new node. If the current node has no next node, or if the search for nextNode attempts to step upward from the TreeWalker's root node, returns null , and retains the current node.

Returns:

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

Overrides:

getNextNode in class AxesWalker

getLevelMax

protected int getLevelMax()

Tell what's the maximum level this axes can descend to (which is actually impossible to predict with this walker?).

Returns:

always a level of 1 right now.

Overrides:

getLevelMax in class AxesWalker