public abstract class GroupMatchingIterator extends java.lang.Object implements LookaheadIterator, LastPositionFinder, GroupIterator
Modifier and Type | Field and Description |
---|---|
protected XPathContext |
baseContext |
protected Item |
current |
protected java.util.List<Item> |
currentMembers |
protected Item |
next |
protected Pattern |
pattern |
protected FocusIterator |
population |
protected int |
position |
protected XPathContext |
runningContext |
protected Expression |
select |
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
---|
GroupMatchingIterator() |
Modifier and Type | Method and Description |
---|---|
protected abstract void |
advance() |
void |
close()
Close the iterator.
|
AtomicSequence |
getCurrentGroupingKey()
Get the grouping key of the current group
|
int |
getProperties()
Get properties of this iterator, as a bit-significant integer.
|
ManualGroupIterator |
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.
|
Item |
next()
Get the next item in the sequence.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
getLength
protected Expression select
protected FocusIterator population
protected Pattern pattern
protected XPathContext baseContext
protected XPathContext runningContext
protected java.util.List<Item> currentMembers
protected Item next
protected Item current
protected int position
protected abstract void advance() throws XPathException
XPathException
public AtomicSequence getCurrentGroupingKey()
GroupIterator
getCurrentGroupingKey
in interface GroupIterator
public SequenceIterator iterateCurrentGroup()
GroupIterator
iterateCurrentGroup
in interface GroupIterator
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 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 ManualGroupIterator getSnapShot(XPathContext context) throws XPathException
GroupIterator
getSnapShot
in interface GroupIterator
XPathException
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