Package net.sf.saxon.om
Class ReverseArrayIterator
- java.lang.Object
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- net.sf.saxon.om.ReverseArrayIterator
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- All Implemented Interfaces:
LastPositionFinder
,ReversibleIterator
,AxisIterator
,LookaheadIterator
,SequenceIterator
public final class ReverseArrayIterator extends java.lang.Object implements AxisIterator, ReversibleIterator, LookaheadIterator, LastPositionFinder
ReverseArrayIterator is used to enumerate items held in an array in reverse order.- Author:
- Michael H. Kay
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Field Summary
Fields Modifier and Type Field Description (package private) Item
current
(package private) int
end
(package private) int
index
(package private) Item[]
items
(package private) int
start
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Fields inherited from interface net.sf.saxon.om.SequenceIterator
ATOMIZABLE, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
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Constructor Summary
Constructors Constructor Description ReverseArrayIterator(Item[] items, int start, int end)
Create an iterator a slice of an array
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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.SequenceIterator
getReverseIterator()
Get an iterator that processes the same items in reverse order.boolean
hasNext()
Determine whether there are more items to come.Item
next()
Get the next item in the sequence.int
position()
Get the current position
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Constructor Detail
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ReverseArrayIterator
public ReverseArrayIterator(Item[] items, int start, int end)
Create an iterator a slice of an array- Parameters:
items
- The array of itemsstart
- The first item in the array to be be used (this will be the last one in the resulting iteration). Zero-based.end
- The item after the last one in the array to be used (this will be the first one to be returned by the iterator). Zero-based.
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Method Detail
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hasNext
public boolean hasNext()
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.- Specified by:
hasNext
in interfaceLookaheadIterator
- Returns:
- true if there are more items in the sequence
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next
public Item next()
Description copied from interface:AxisIterator
Get the next item in the sequence.- Specified by:
next
in interfaceAxisIterator
- Specified by:
next
in interfaceSequenceIterator
- Returns:
- the next Item. If there are no more nodes, return null.
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current
public Item current()
Description copied from interface:AxisIterator
Get the current item in the sequence.- Specified by:
current
in interfaceAxisIterator
- Specified by:
current
in interfaceSequenceIterator
- Returns:
- the current item, that is, the item most recently returned by next()
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position
public int position()
Description copied from interface:AxisIterator
Get the current position- Specified by:
position
in interfaceAxisIterator
- Specified by:
position
in interfaceSequenceIterator
- Returns:
- the position of the current item (the item most recently returned by next()), starting at 1 for the first node
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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 settingSequenceIterator.LAST_POSITION_FINDER
- Specified by:
getLastPosition
in interfaceLastPositionFinder
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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 interfaceAxisIterator
- Specified by:
getAnother
in interfaceSequenceIterator
- Returns:
- a new iterator over the same sequence
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getProperties
public int getProperties()
Get properties of this iterator, as a bit-significant integer.- Specified by:
getProperties
in interfaceSequenceIterator
- Returns:
- the properties of this iterator. This will be some combination of
properties such as
SequenceIterator.GROUNDED
,SequenceIterator.LAST_POSITION_FINDER
, andSequenceIterator.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.
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getReverseIterator
public SequenceIterator getReverseIterator()
Get an iterator that processes the same items in reverse order. Since this iterator is processing the items backwards, this method returns an ArrayIterator that processes them forwards.- Specified by:
getReverseIterator
in interfaceReversibleIterator
- Returns:
- a new ArrayIterator
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