net.sf.saxon.tree.tiny

Class SiblingEnumeration

java.lang.Object

net.sf.saxon.tree.iter.AxisIteratorImpl

net.sf.saxon.tree.tiny.SiblingEnumeration

All Implemented Interfaces:

SequenceIterator, AxisIterator, LookaheadIterator, UnfailingIterator

final class SiblingEnumeration
extends AxisIteratorImpl
implements LookaheadIterator

This class supports both the child:: and following-sibling:: axes, which are identical except for the route to the first candidate node. It enumerates either the children or the following siblings of the specified node. In the case of children, the specified node must always be a node that has children: to ensure this, construct the enumeration using NodeInfo#getEnumeration()

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
SiblingEnumeration(TinyTree tree, TinyNodeImpl node, NodeTest nodeTest, boolean getChildren) Return an enumeration over children or siblings of the context node

Method Summary

Modifier and Type	Method and Description
Value	atomize() Return the atomized value of the current node.
Item	current() Get the current node in the sequence.
SequenceIterator	getAnother() Get another enumeration of the same nodes
int	getProperties() Get properties of this iterator, as a bit-significant integer.
CharSequence	getStringValue() Return the string value of the current node.
boolean	hasNext() Test whether there are any more nodes to come.
boolean	moveNext() Move to the next node, without returning it.
Item	next() Return the next node in the sequence

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

close, iterateAxis, position

Methods inherited from class java.lang.Object

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

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

close, position

Constructor Detail

SiblingEnumeration

SiblingEnumeration(TinyTree tree,
                   TinyNodeImpl node,
                   NodeTest nodeTest,
                   boolean getChildren)

Return an enumeration over children or siblings of the context node

Parameters:

tree - The TinyTree containing the context node

node - The context node, the start point for the iteration

nodeTest - Test that the selected nodes must satisfy, or null indicating that all nodes are selected

getChildren - True if children of the context node are to be returned, false if following siblings are required

Method Detail

moveNext

public boolean moveNext()

Description copied from class: AxisIteratorImpl

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

Overrides:

moveNext in class AxisIteratorImpl

next

public Item next()

Return the next node in the sequence

Specified by:

next in interface SequenceIterator

Specified by:

next in interface UnfailingIterator

Returns:

the next node, or null if the end of the sequence is reached

current

public Item current()

Get the current node in the sequence.

Specified by:

current in interface SequenceIterator

Specified by:

current in interface UnfailingIterator

Overrides:

current in class AxisIteratorImpl

Returns:

the node returned by the most recent call on next(), or the one on which we have positioned using moveNext().

hasNext

public boolean hasNext()

Test whether there are any more nodes to come. This method is used only when testing whether the current item is the last in the sequence. It's not especially efficient, but is more efficient than the alternative strategy which involves counting how many nodes there are in the sequence.

Specified by:

hasNext in interface LookaheadIterator

Returns:

true if there are more items in the sequence

atomize

public Value atomize()
              throws XPathException

Return the atomized value of the current node. This is achieved in common cases without actually instantiating the NodeInfo object

Specified by:

atomize in interface AxisIterator

Overrides:

atomize in class AxisIteratorImpl

Returns:

the atomized value.

Throws:

NullPointerException - if there is no current node

XPathException

getStringValue

public CharSequence getStringValue()

Return the string value of the current node.

Specified by:

getStringValue in interface AxisIterator

Overrides:

getStringValue in class AxisIteratorImpl

Returns:

the string value, as an instance of CharSequence.

Throws:

NullPointerException - if there is no current node

getAnother

public SequenceIterator getAnother()

Get another enumeration of the same nodes

Specified by:

getAnother in interface SequenceIterator

Specified by:

getAnother in interface UnfailingIterator

Returns:

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

getProperties

public int getProperties()

Description copied from class: AxisIteratorImpl

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

Specified by:

getProperties in interface SequenceIterator

Overrides:

getProperties in class AxisIteratorImpl

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.