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java.lang.Object net.sf.saxon.expr.ReverseRangeIterator
public class ReverseRangeIterator
Iterator that produces numeric values in a monotonic sequence, ascending or descending. Although a range expression (N to M) is always in ascending order, applying the reverse() function will produce a RangeIterator that works in descending order.
Field Summary |
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Fields inherited from interface net.sf.saxon.om.SequenceIterator |
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GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD |
Constructor Summary | |
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ReverseRangeIterator(long start,
long end)
Create an iterator over a range of integers in monotonic descending order |
Method Summary | |
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void |
close()
Close the iterator. |
IntegerValue |
current()
Get the current value in the sequence (the one returned by the most recent call on next()). |
SequenceIterator<IntegerValue> |
getAnother()
Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence. |
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<IntegerValue> |
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. |
int |
position()
Get the current position. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ReverseRangeIterator(long start, long end)
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 <= startMethod Detail |
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public boolean hasNext()
LookaheadIterator
SequenceIterator.LOOKAHEAD
hasNext
in interface LookaheadIterator<IntegerValue>
public IntegerValue next()
SequenceIterator
next
in interface SequenceIterator<IntegerValue>
public IntegerValue current()
SequenceIterator
current
in interface SequenceIterator<IntegerValue>
public int position()
SequenceIterator
This method does not change the state of the iterator.
position
in interface SequenceIterator<IntegerValue>
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<IntegerValue>
public int getLength()
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLength
in interface LastPositionFinder<IntegerValue>
public SequenceIterator<IntegerValue> getAnother() throws XPathException
SequenceIterator
This method allows access to all the items in the sequence without disturbing the current position of the iterator. Internally, its main use is in evaluating the last() function.
This method does not change the state of the iterator.
getAnother
in interface SequenceIterator<IntegerValue>
XPathException
- if any error occurspublic int getProperties()
getProperties
in interface SequenceIterator<IntegerValue>
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<IntegerValue> getReverseIterator()
ReversibleIterator
getReverseIterator
in interface ReversibleIterator<IntegerValue>
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