public static class DistinctValues.DistinctIterator extends java.lang.Object implements SequenceIterator
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
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DistinctIterator(SequenceIterator base,
StringCollator collator,
XPathContext context)
Create an iterator over the distinct values in a sequence
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Modifier and Type | Method and Description |
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void |
close()
Close the iterator.
|
int |
getProperties()
Get properties of this iterator, as a bit-significant integer.
|
AtomicValue |
next()
Get the next item in the sequence.
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public DistinctIterator(SequenceIterator base, StringCollator collator, XPathContext context)
base
- the input sequence. This must return atomic values only.collator
- The comparer used to obtain comparison keys from each value;
these comparison keys are themselves compared using equals().context
- the XPath dynamic contextpublic AtomicValue next() throws XPathException
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itempublic 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 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.Copyright (c) 2004-2018 Saxonica Limited. All rights reserved.