net.sf.saxon.tree.util

Class SteppingNavigator.DescendantAxisIterator

java.lang.Object

net.sf.saxon.tree.util.SteppingNavigator.DescendantAxisIterator

All Implemented Interfaces:

SequenceIterator<NodeInfo>, AxisIterator<NodeInfo>, UnfailingIterator<NodeInfo>

Enclosing class:

SteppingNavigator

public static class SteppingNavigator.DescendantAxisIterator
extends Object
implements AxisIterator<NodeInfo>

An iterator over the descendant or descendant-or-self axis

Field Summary

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

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

Constructors

Constructor and Description
SteppingNavigator.DescendantAxisIterator(SteppingNode start, boolean includeSelf, NodeTest test) Create an iterator over the descendant or descendant-or-self axis

Method Summary

Methods

Modifier and Type	Method and Description
Sequence	atomize() Return the atomized value of the current node.
void	close() Close the iterator.
SteppingNode	current() Get the current item in the sequence.
AxisIterator<NodeInfo>	getAnother() Get another iterator over the same sequence of items, positioned at the start of the sequence.
int	getProperties() Get properties of this iterator, as a bit-significant integer.
CharSequence	getStringValue() Return the string value of the current node.
AxisIterator	iterateAxis(byte axis, NodeTest test) Return an iterator over an axis, starting at the current node.
boolean	moveNext() Move to the next node, without returning it.
SteppingNode	next() Get the next item in the sequence.
int	position() Get the current position

Methods inherited from class java.lang.Object

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

Constructor Detail

SteppingNavigator.DescendantAxisIterator

public SteppingNavigator.DescendantAxisIterator(SteppingNode start,
                                        boolean includeSelf,
                                        NodeTest test)

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

Parameters:

start - the root of the subtree whose descendants are required

includeSelf - true if this is the descendant-or-self axis

test - the node-test that selected nodes must satisfy

Method Detail

moveNext

public boolean moveNext()

Move to the next node, without returning it. Returns true if there is a next node, false if the end of the sequence has been reached. After calling this method, the current node may be retrieved using the current() function.

Specified by:

moveNext in interface AxisIterator<NodeInfo>

Returns:

true if there is a next node, false if the end of the sequence has been reached

next

public SteppingNode next()

Description copied from interface: UnfailingIterator

Get the next item in the sequence.

Specified by:

next in interface SequenceIterator<NodeInfo>

Specified by:

next in interface AxisIterator<NodeInfo>

Specified by:

next in interface UnfailingIterator<NodeInfo>

Returns:

the next Item. If there are no more nodes, return null.

current

public SteppingNode current()

Description copied from interface: UnfailingIterator

Get the current item in the sequence.

Specified by:

current in interface SequenceIterator<NodeInfo>

Specified by:

current in interface AxisIterator<NodeInfo>

Specified by:

current in interface UnfailingIterator<NodeInfo>

Returns:

the current item, that is, the item most recently returned by next()

position

public int position()

Description copied from interface: UnfailingIterator

Get the current position

Specified by:

position in interface SequenceIterator<NodeInfo>

Specified by:

position in interface UnfailingIterator<NodeInfo>

Returns:

the position of the current item (the item most recently returned by next()), starting at 1 for the first node

close

public void close()

Description copied from interface: SequenceIterator

Close the iterator. This indicates to the supplier of the data that the client does not require any more items to be delivered by the iterator. This may enable the supplier to release resources. After calling close(), no further calls on the iterator should be made; if further calls are made, the effect of such calls is undefined.

(Currently, closing an iterator is important only when the data is being "pushed" in another thread. Closing the iterator terminates that thread and means that it needs to do no additional work. Indeed, failing to close the iterator may cause the push thread to hang waiting for the buffer to be emptied.)

Specified by:

close in interface SequenceIterator<NodeInfo>

iterateAxis

public AxisIterator iterateAxis(byte axis,
                       NodeTest test)

Return an iterator over an axis, starting at the current node.

Specified by:

iterateAxis in interface AxisIterator<NodeInfo>

Parameters:

axis - the axis to iterate over, using a constant such as AxisInfo.CHILD

test - a predicate to apply to the nodes before returning them.

Returns:

an iterator over an axis, starting at the current node

Throws:

NullPointerException - if there is no current node

atomize

public Sequence atomize()
                 throws XPathException

Return the atomized value of the current node.

Specified by:

atomize in interface AxisIterator<NodeInfo>

Returns:

the atomized value.

Throws:

NullPointerException - if there is no current node

XPathException - if the current node cannot be atomized, for example because it is an element node with element-only content.

getStringValue

public CharSequence getStringValue()

Return the string value of the current node.

Specified by:

getStringValue in interface AxisIterator<NodeInfo>

Returns:

the string value, as an instance of CharSequence.

Throws:

NullPointerException - if there is no current node

getAnother

public AxisIterator<NodeInfo> 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<NodeInfo>

Specified by:

getAnother in interface AxisIterator<NodeInfo>

Specified by:

getAnother in interface UnfailingIterator<NodeInfo>

Returns:

a new iterator over the same sequence

getProperties

public int getProperties()

Description copied from interface: SequenceIterator

Get properties of this iterator, as a bit-significant integer.

Specified by:

getProperties in interface SequenceIterator<NodeInfo>

Returns:

the properties of this iterator. This will be some combination of properties such as SequenceIterator.GROUNDED, SequenceIterator.LAST_POSITION_FINDER, and SequenceIterator.LOOKAHEAD. It is always acceptable to return the value zero, indicating that there are no known special properties. It is acceptable for the properties of the iterator to change depending on its state.