net.sf.saxon.om
Class ListIterator

java.lang.Object
  net.sf.saxon.om.ListIterator

All Implemented Interfaces:

LastPositionFinder, AxisIterator, GroundedIterator, LookaheadIterator, SequenceIterator

public final class ListIterator
extends Object
implements AxisIterator, LastPositionFinder, LookaheadIterator, GroundedIterator

Class ListIterator, iterates over a sequence of items held in a Java ArrayList, or indeed in any other kind of List

Field Summary

(package private) Item	current
(package private) int	index
(package private) int	length
(package private) List	list

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

ATOMIZABLE, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

ListIterator(List list)
Create a ListIterator over a given List

ListIterator(List list, int length)
Create a ListIterator over the leading part of a given List

Method Summary

Item	current() Get the current item in the sequence.
SequenceIterator	getAnother() Get another iterator over the same sequence of items, positioned at the start of the sequence.
int	getLastPosition() Get the last position (that is, the number of items in the sequence).
int	getProperties() Get properties of this iterator, as a bit-significant integer.
boolean	hasNext() Determine whether there are more items to come.
Value	materialize() Return a SequenceValue containing all the items in the sequence returned by this SequenceIterator
Item	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

Field Detail

index

int index

length

int length

current

Item current

list

List list

Constructor Detail

ListIterator

public ListIterator(List list)

Create a ListIterator over a given List

Parameters:

list - the list: all objects in the list must be instances of Item

ListIterator

public ListIterator(List list,
                    int length)

Create a ListIterator over the leading part of a given List

Parameters:

list - the list: all objects in the list must be instances of Item

length: - the number of items to be included

Method Detail

hasNext

public boolean hasNext()

Description copied from interface: LookaheadIterator

Determine whether there are more items to come. Note that this operation is stateless and it is not necessary (or usual) to call it before calling next(). It is used only when there is an explicit need to tell if we are at the last element.

This method must not be called unless the result of getProperties() on the iterator includes the bit setting SequenceIterator.LOOKAHEAD

Specified by:

hasNext in interface LookaheadIterator

Returns:

true if there are more items in the sequence

next

public Item next()

Description copied from interface: AxisIterator

Get the next item in the sequence.

Specified by:

next in interface AxisIterator

Specified by:

next in interface SequenceIterator

Returns:

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

current

public Item current()

Description copied from interface: AxisIterator

Get the current item in the sequence.

Specified by:

current in interface AxisIterator

Specified by:

current in interface SequenceIterator

Returns:

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

position

public int position()

Description copied from interface: AxisIterator

Get the current position

Specified by:

position in interface AxisIterator

Specified by:

position in interface SequenceIterator

Returns:

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

getLastPosition

public int getLastPosition()

Description copied from interface: LastPositionFinder

Get the last position (that is, the number of items in the sequence). This method is non-destructive: it does not change the state of the iterator. The result is undefined if the next() method of the iterator has already returned null. This method must not be called unless the result of getProperties() on the iterator includes the bit setting SequenceIterator.LAST_POSITION_FINDER

Specified by:

getLastPosition in interface LastPositionFinder

getAnother

public SequenceIterator getAnother()

Description copied from interface: AxisIterator

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 AxisIterator

Specified by:

getAnother in interface SequenceIterator

Returns:

a new iterator over the same sequence

getProperties

public int getProperties()

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

Specified by:

getProperties in interface SequenceIterator

Returns:

the properties of this iterator. This will be some combination of properties such as GROUNDED, LAST_POSITION_FINDER, and 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.

materialize

public Value materialize()

Return a SequenceValue containing all the items in the sequence returned by this SequenceIterator

Specified by:

materialize in interface GroundedIterator

Returns:

the corresponding SequenceValue