org.apache.xpath.axes
Class WalkingIterator

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

Direct Known Subclasses:

KeyIterator, WalkingIteratorSorted

public class WalkingIterator

extends LocPathIterator

Location path iterator that uses Walkers.

See Also:

Serialized Form

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

m_lastFetched

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

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

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() **For advanced use only** Get the head of the walker list.
AxesWalker	getLastUsedWalker() **For advanced use only** 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) **For advanced use only** Set the last used walker.

Methods inherited from class org.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, runTo, setCurrentContextNode, setCurrentPos, setEnvironment, setIsTopLevel, setItem, setLast, setRoot, setShouldCacheNodes, size

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

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

Methods inherited from class org.apache.xpath.Expression

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

Methods inherited from class java.lang.Object

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

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()

**For advanced use only** 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)

**For advanced use only** Set the last used walker.

Parameters:

walker - The last used walker, or null.

getLastUsedWalker

public final AxesWalker getLastUsedWalker()

**For advanced use only** 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