public class DifferenceEnumeration extends java.lang.Object implements SequenceIterator
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
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DifferenceEnumeration(SequenceIterator p1,
SequenceIterator p2,
ItemOrderComparer comparer)
Form an enumeration of the difference of two nodesets, that is, the nodes
that are in p1 and that are not in p2.
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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.
|
NodeInfo |
next()
Get the next item in the sequence.
|
public DifferenceEnumeration(SequenceIterator p1, SequenceIterator p2, ItemOrderComparer comparer) throws XPathException
p1
- the first operand, with nodes delivered in document orderp2
- the second operand, with nodes delivered in document ordercomparer
- the comparerXPathException
- if a failure occurs reading from either input sequencepublic NodeInfo next() throws XPathException
SequenceIterator
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.