weblogic.apache.xpath.axes
Class WalkingIterator

java.lang.Object
  |
  +--weblogic.apache.xpath.Expression
        |
        +--weblogic.apache.xpath.patterns.NodeTest
              |
              +--weblogic.apache.xpath.axes.PredicatedNodeTest
                    |
                    +--weblogic.apache.xpath.axes.LocPathIterator
                          |
                          +--weblogic.apache.xpath.axes.WalkingIterator

Direct Known Subclasses:

KeyIterator, WalkingIteratorSorted

public class WalkingIterator

extends LocPathIterator

Location path iterator that uses Walkers.

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:

Serialized Form

Field Summary

protected AxesWalker	m_firstWalker The head of the step walker list.
protected AxesWalker	m_lastUsedWalker The last used step walker in the walker list.

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

m_cdtm, m_clones, m_context, m_currentContextNode, m_execContext, m_last, m_lastFetched, m_next, m_prefixResolver

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

m_foundLast, m_lpi, m_predCount, m_proximityPositions

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

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

Fields inherited from class weblogic.apache.xpath.Expression

m_slocator

Constructor Summary

protected

WalkingIterator(PrefixResolver nscontext) Create a WalkingIterator object.

Method Summary

java.lang.Object	clone() Get a cloned WalkingIterator that holds the same position as this iterator.
void	detach() Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state.
void	fixupVariables(java.util.Vector vars, int globalsSize) This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
AxesWalker	getFirstWalker() Get the head of the walker list.
AxesWalker	getLastUsedWalker() Get the last used walker.
int	nextNode() Returns the next node in the set and advances the position of the iterator in the set.
void	reset() Reset the iterator.
void	setLastUsedWalker(AxesWalker walker) Set the last used walker.

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

allowDetachToRelease, asIterator, asNode, bool, cloneWithReset, execute, findLastPos, getAxis, getCachedNodes, getContext, getCurrentContextNode, getCurrentNode, getCurrentPos, getDTM, getDTMManager, getExpandEntityReferences, getFilter, getFoundLast, getIsTopLevel, getLast, getLastPos, getLength, getPrefixResolver, getRoot, getWhatToShow, getXPathContext, isDocOrdered, isFresh, isMutable, isNodesetExpr, item, previousNode, returnNextNode, runTo, setCurrentContextNode, setCurrentPos, setEnvironment, setIsTopLevel, setItem, setLast, setNextPosition, setRoot, setShouldCacheNodes, size

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

acceptNode, canTraverseOutsideSubtree, 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, getNodeTypeTest, getStaticScore, initNodeTest, initNodeTest, setLocalName, setNamespace, setStaticScore, setWhatToShow

Methods inherited from class weblogic.apache.xpath.Expression

assertion, error, executeCharsToContentHandler, isStableNumber, num, setSourceLocator, warn, xstr

Methods inherited from class java.lang.Object

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

Field Detail

m_lastUsedWalker

protected AxesWalker m_lastUsedWalker

The last used step walker in the walker list.

m_firstWalker

protected AxesWalker m_firstWalker

The head of the step walker list.

Constructor Detail

WalkingIterator

protected WalkingIterator(PrefixResolver nscontext)

Create a WalkingIterator object.

Parameters:

nscontext - The namespace context for this iterator, should be OK if null.

Method Detail

clone

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

Get a cloned WalkingIterator that holds the same position as this iterator.

Returns:

A clone of this iterator that holds the same node position.

Throws:

java.lang.CloneNotSupportedException -

Overrides:

clone in class PredicatedNodeTest

reset

public void reset()

Reset the iterator.

Overrides:

reset in class LocPathIterator

nextNode

public int nextNode()

Returns the next node in the set and advances the position of the iterator in the set. After a NodeIterator is created, the first call to nextNode() returns the first node in the set.

Returns:

The next Node in the set being iterated over, or null if there are no more members in that set.

Overrides:

nextNode in class LocPathIterator

getFirstWalker

public final AxesWalker getFirstWalker()

Get the head of the walker list.

Returns:

The head of the walker list, or null if this iterator does not implement walkers.

setLastUsedWalker

public final void setLastUsedWalker(AxesWalker walker)

Set the last used walker.

Parameters:

walker - The last used walker, or null.

getLastUsedWalker

public final AxesWalker getLastUsedWalker()

Get the last used walker.

Returns:

The last used walker, or null.

detach

public void detach()

Detaches the iterator from the set which it iterated over, releasing any computational resources and placing the iterator in the INVALID state. Afterdetach has been invoked, calls to nextNode orpreviousNode will raise the exception INVALID_STATE_ERR.

Overrides:

detach in class LocPathIterator

fixupVariables

public void fixupVariables(java.util.Vector vars,
                           int globalsSize)

This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.

Parameters:

vars - List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame).

Overrides:

fixupVariables in class PredicatedNodeTest