public class MergeGroupingIterator extends java.lang.Object implements GroupIterator, LookaheadIterator, LastPositionFinder
Modifier and Type | Class and Description |
---|---|
class |
MergeGroupingIterator.ManualMergeGroupingIterator |
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
---|
MergeGroupingIterator(SequenceIterator p1,
ItemOrderComparer comp,
LastPositionFinder lpf) |
Modifier and Type | Method and Description |
---|---|
void |
close()
Close the iterator.
|
AtomicSequence |
getCurrentGroupingKey()
Get the grouping key of the current group
|
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.
|
MergeGroupingIterator.ManualMergeGroupingIterator |
getSnapShot(XPathContext context)
Get a sequence which is a snapshot of this sequence at the current position
|
boolean |
hasNext()
Determine whether there are more items to come.
|
SequenceIterator |
iterateCurrentGroup()
Get an iterator over the members of the current group, in population
order.
|
SequenceIterator |
iterateCurrentGroup(java.lang.String source) |
Item |
next()
Get the next item in the sequence.
|
public MergeGroupingIterator(SequenceIterator p1, ItemOrderComparer comp, LastPositionFinder lpf) throws XPathException
XPathException
public MergeGroupingIterator.ManualMergeGroupingIterator getSnapShot(XPathContext context) throws XPathException
GroupIterator
getSnapShot
in interface GroupIterator
XPathException
public boolean hasNext()
LookaheadIterator
SequenceIterator.LOOKAHEAD
hasNext
in interface LookaheadIterator
public Item 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 getLength() throws XPathException
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLength
in interface LastPositionFinder
XPathException
- if an error occurs evaluating the sequence in order to determine
the number of itemspublic int getProperties()
SequenceIterator
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 AtomicSequence getCurrentGroupingKey()
GroupIterator
getCurrentGroupingKey
in interface GroupIterator
public SequenceIterator iterateCurrentGroup() throws XPathException
GroupIterator
iterateCurrentGroup
in interface GroupIterator
XPathException
- if a dynamic error occurspublic SequenceIterator iterateCurrentGroup(java.lang.String source) throws XPathException
XPathException
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