net.sf.saxon.tree.util
Class Navigator.DescendantEnumeration

java.lang.Object
  net.sf.saxon.tree.iter.AxisIteratorImpl
      net.sf.saxon.tree.util.Navigator.BaseEnumeration
          net.sf.saxon.tree.util.Navigator.DescendantEnumeration

All Implemented Interfaces:

SequenceIterator, AxisIterator, UnfailingIterator

Enclosing class:

Navigator

public static final class Navigator.DescendantEnumeration
extends Navigator.BaseEnumeration

General-purpose implementation of the descendant and descendant-or-self axes, in terms of the child axis. But it also has the option to return the descendants in reverse document order; this is used when evaluating the preceding axis. Note that the includeSelf option should not be used when scanning in reverse order, as the self node will always be returned first.

Field Summary

Fields inherited from class net.sf.saxon.tree.iter.AxisIteratorImpl

current, position

Fields inherited from interface net.sf.saxon.om.SequenceIterator

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

Navigator.DescendantEnumeration(NodeInfo start, boolean includeSelf, boolean forwards)
Create an iterator over the descendant or descendant-or-self axis

Method Summary

void	advance() The advance() method must be provided in each concrete implementation.
AxisIterator	getAnother() Get another iterator over the same sequence of items, positioned at the start of the sequence.

Methods inherited from class net.sf.saxon.tree.util.Navigator.BaseEnumeration

next

Methods inherited from class net.sf.saxon.tree.iter.AxisIteratorImpl

atomize, close, current, getProperties, getStringValue, iterateAxis, moveNext, position

Methods inherited from class java.lang.Object

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

Constructor Detail

Navigator.DescendantEnumeration

public Navigator.DescendantEnumeration(NodeInfo start,
                                       boolean includeSelf,
                                       boolean forwards)

Create an iterator over the descendant or descendant-or-self axis

Parameters:

start - the initial context node

includeSelf - true if the "self" node is to be included

forwards - true for a forwards iteration, false for reverse order

Method Detail

advance

public void advance()

Description copied from class: Navigator.BaseEnumeration

The advance() method must be provided in each concrete implementation. It must leave the variable current set to the next node to be returned in the iteration, or to null if there are no more nodes to be returned.

Specified by:

advance in class Navigator.BaseEnumeration

getAnother

public AxisIterator getAnother()

Description copied from interface: UnfailingIterator

Get another iterator over the same sequence of items, positioned at the start of the sequence. It must be possible to call this method at any time, whether none, some, or all of the items in the original iterator have been read. The method is non-destructive: it does not change the state of the original iterator.

Specified by:

getAnother in interface SequenceIterator

Specified by:

getAnother in interface AxisIterator

Specified by:

getAnother in interface UnfailingIterator

Specified by:

getAnother in class Navigator.BaseEnumeration

Returns:

a new iterator over the same sequence