net.sf.saxon.tree.util

Class Navigator.EmptyTextFilter

java.lang.Object

net.sf.saxon.tree.iter.AxisIteratorImpl

net.sf.saxon.tree.util.Navigator.EmptyTextFilter

All Implemented Interfaces:

SequenceIterator, AxisIterator, UnfailingIterator

Enclosing class:

Navigator

public static class Navigator.EmptyTextFilter
extends AxisIteratorImpl

EmptyTextFilter is an iterator that applies removes any zero-length text nodes returned by an underlying AxisIterator.

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

Constructors

Constructor and Description
EmptyTextFilter(AxisIterator base) Construct an EmptyTextFilter

Method Summary

Modifier and Type	Method and Description
SequenceIterator	getAnother() Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence.
Item	next() Get the next item in the sequence.

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

EmptyTextFilter

public EmptyTextFilter(AxisIterator base)

Construct an EmptyTextFilter

Parameters:

base - the underlying iterator that returns all the nodes on a required axis. This must not be an atomizing iterator

Method Detail

next

public Item next()

Description copied from interface: SequenceIterator

Get the next item in the sequence. This method changes the state of the iterator, in particular it affects the result of subsequent calls of position() and current().

Returns:

the next item, or null if there are no more items. Once a call on next() has returned null, no further calls should be made. The preferred action for an iterator if subsequent calls on next() are made is to return null again, and all implementations within Saxon follow this rule.

getAnother

public SequenceIterator getAnother()

Description copied from interface: SequenceIterator

Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence.

This method allows access to all the items in the sequence without disturbing the current position of the iterator. Internally, its main use is in evaluating the last() function.

This method does not change the state of the iterator.

Returns:

a SequenceIterator that iterates over the same items, positioned before the first item