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java.lang.Object net.sf.saxon.functions.DistinctValues.DistinctIterator
public static class DistinctValues.DistinctIterator
Iterator class to return the distinct values in a sequence
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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DistinctValues.DistinctIterator(SequenceIterator base,
AtomicComparer comparer)
Create an iterator over the distinct values in a sequence |
Method Summary | |
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void |
close()
Close the iterator. |
Item |
current()
Get the current value in the sequence (the one returned by the most recent call on next()). |
SequenceIterator |
getAnother()
Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence. |
int |
getProperties()
Get properties of this iterator, as a bit-significant integer. |
Item |
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 DistinctValues.DistinctIterator(SequenceIterator base, AtomicComparer comparer)
base
- the input sequence. This must return atomic values only.comparer
- The comparer used to obtain comparison keys from each value;
these comparison keys are themselves compared using equals().Method Detail |
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public Item next() throws XPathException
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itempublic Item current()
current
in interface SequenceIterator
public int position()
position
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 SequenceIterator getAnother() throws XPathException
getAnother
in interface SequenceIterator
XPathException
- if any error occurspublic 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.
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