org.apache.xalan.xsltc.dom
Class CurrentNodeListIterator

java.lang.Object
  org.apache.xml.dtm.ref.DTMAxisIteratorBase
      org.apache.xalan.xsltc.dom.CurrentNodeListIterator

All Implemented Interfaces:

java.lang.Cloneable, DTMAxisIterator

public final class CurrentNodeListIterator
extends DTMAxisIteratorBase

Iterators of this kind use a CurrentNodeListFilter to filter a subset of nodes from a source iterator. For each node from the source, the boolean method CurrentNodeListFilter.test() is called. All nodes from the source are read into an array upon calling setStartNode() (this is needed to determine the value of last, a parameter to CurrentNodeListFilter.test()). The method getLast() returns the last element after applying the filter.

Field Summary

private int	_currentIndex Index in _nodes of the next node to filter.
private int	_currentNode The current node in the stylesheet at the time of evaluation.
private boolean	_docOrder A flag indicating if nodes are returned in document order.
private CurrentNodeListFilter	_filter A reference to a filter object.
private IntegerArray	_nodes An integer array to store nodes from source iterator.
private DTMAxisIterator	_source The source for this iterator.
private AbstractTranslet	_translet A reference to the translet.

Fields inherited from class org.apache.xml.dtm.ref.DTMAxisIteratorBase

_includeSelf, _isRestartable, _last, _markedNode, _position, _startNode

Fields inherited from interface org.apache.xml.dtm.DTMAxisIterator

END

Constructor Summary

CurrentNodeListIterator(DTMAxisIterator source, boolean docOrder, CurrentNodeListFilter filter, int currentNode, AbstractTranslet translet)

CurrentNodeListIterator(DTMAxisIterator source, CurrentNodeListFilter filter, int currentNode, AbstractTranslet translet)

Method Summary

DTMAxisIterator	cloneIterator() Returns a deep copy of this iterator.
private int	computePositionOfLast()
DTMAxisIterator	forceNaturalOrder()
int	getLast() Returns the position of the last node within the iteration, as defined by XPath.
void	gotoMark() Restores the current node remembered by setMark().
boolean	isReverse()
int	next() Get the next node in the iteration.
DTMAxisIterator	reset() Resets the iterator to the last start node.
void	setMark() Remembers the current node for the next call to gotoMark().
void	setRestartable(boolean isRestartable) Set if restartable.
DTMAxisIterator	setStartNode(int node) Set start to END should 'close' the iterator, i.e.

Methods inherited from class org.apache.xml.dtm.ref.DTMAxisIteratorBase

getAxis, getNodeByPosition, getPosition, getStartNode, includeSelf, isDocOrdered, resetPosition, returnNode

Methods inherited from class java.lang.Object

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

Field Detail

_docOrder

private boolean _docOrder

A flag indicating if nodes are returned in document order.

_source

private DTMAxisIterator _source

The source for this iterator.

_filter

private final CurrentNodeListFilter _filter

A reference to a filter object.

_nodes

private IntegerArray _nodes

An integer array to store nodes from source iterator.

_currentIndex

private int _currentIndex

Index in _nodes of the next node to filter.

_currentNode

private final int _currentNode

The current node in the stylesheet at the time of evaluation.

_translet

private AbstractTranslet _translet

A reference to the translet.

Constructor Detail

CurrentNodeListIterator

public CurrentNodeListIterator(DTMAxisIterator source,
                               CurrentNodeListFilter filter,
                               int currentNode,
                               AbstractTranslet translet)

CurrentNodeListIterator

public CurrentNodeListIterator(DTMAxisIterator source,
                               boolean docOrder,
                               CurrentNodeListFilter filter,
                               int currentNode,
                               AbstractTranslet translet)

Method Detail

forceNaturalOrder

public DTMAxisIterator forceNaturalOrder()

setRestartable

public void setRestartable(boolean isRestartable)

Description copied from interface: DTMAxisIterator

Set if restartable.

Specified by:

setRestartable in interface DTMAxisIterator

Overrides:

setRestartable in class DTMAxisIteratorBase

isReverse

public boolean isReverse()

Specified by:

isReverse in interface DTMAxisIterator

Overrides:

isReverse in class DTMAxisIteratorBase

Returns:

true if this iterator has a reversed axis, else false

cloneIterator

public DTMAxisIterator cloneIterator()

Description copied from class: DTMAxisIteratorBase

Returns a deep copy of this iterator. Cloned iterators may not be restartable. The iterator being cloned may or may not become non-restartable as a side effect of this operation.

Specified by:

cloneIterator in interface DTMAxisIterator

Overrides:

cloneIterator in class DTMAxisIteratorBase

Returns:

a deep copy of this iterator.

reset

public DTMAxisIterator reset()

Description copied from interface: DTMAxisIterator

Resets the iterator to the last start node.

Specified by:

reset in interface DTMAxisIterator

Overrides:

reset in class DTMAxisIteratorBase

Returns:

A DTMAxisIterator which has been reset to the start node, which may or may not be the same as this iterator.

next

public int next()

Description copied from interface: DTMAxisIterator

Get the next node in the iteration.

Returns:

The next node handle in the iteration, or END.

setStartNode

public DTMAxisIterator setStartNode(int node)

Description copied from interface: DTMAxisIterator

Set start to END should 'close' the iterator, i.e. subsequent call to next() should return END.

Parameters:

node - Sets the root of the iteration.

Returns:

A DTMAxisIterator set to the start of the iteration.

getLast

public int getLast()

Description copied from class: DTMAxisIteratorBase

Returns the position of the last node within the iteration, as defined by XPath. In a forward iterator, I believe this equals the number of nodes which this iterator will yield. In a reverse iterator, I believe it should return 1 (since the "last" is the first produced.) This may be an expensive operation when called the first time, since it may have to iterate through a large part of the document to produce its answer.

Specified by:

getLast in interface DTMAxisIterator

Overrides:

getLast in class DTMAxisIteratorBase

Returns:

The number of nodes in this iterator (forward) or 1 (reverse).

setMark

public void setMark()

Description copied from interface: DTMAxisIterator

Remembers the current node for the next call to gotoMark().

gotoMark

public void gotoMark()

Description copied from interface: DTMAxisIterator

Restores the current node remembered by setMark().

computePositionOfLast

private int computePositionOfLast()