public class ReverseRangeIterator extends java.lang.Object implements SequenceIterator, ReversibleIterator, LastPositionFinder, LookaheadIterator
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
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ReverseRangeIterator(long start,
long end)
Create an iterator over a range of integers in monotonic descending order
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Modifier and Type | Method and Description |
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void |
close()
Close the iterator.
|
int |
getLength()
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 a new SequenceIterator that returns the same items in reverse order.
|
boolean |
hasNext()
Determine whether there are more items to come.
|
IntegerValue |
next()
Get the next item in the sequence.
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public ReverseRangeIterator(long start, long end) throws XPathException
start
- the first integer to be delivered (the highest in the range)end
- the last integer to be delivered (the lowest in the range). Must be <= startXPathException
- if the values are inconsistent or if the length is greater than 2^31public boolean hasNext()
LookaheadIterator
SequenceIterator.LOOKAHEAD
hasNext
in interface LookaheadIterator
public IntegerValue next()
SequenceIterator
next
in interface SequenceIterator
public void close()
SequenceIterator
(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.)
close
in interface SequenceIterator
public int getLength()
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLength
in interface LastPositionFinder
public int getProperties()
getProperties
in interface SequenceIterator
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.public SequenceIterator getReverseIterator()
ReversibleIterator
getReverseIterator
in interface ReversibleIterator
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