public final class MemoClosure.ProgressiveIterator extends java.lang.Object implements SequenceIterator, LastPositionFinder, GroundedIterator
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
?????? |
---|
ProgressiveIterator()
Create a ProgressiveIterator
|
?????? | ????? |
---|---|
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 |
getLastPosition()
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.
|
GroundedValue |
materialize()
Return a value containing all the items in the sequence returned by this
SequenceIterator
|
Item |
next()
Get the next item in the sequence.
|
int |
position()
Get the current position.
|
public Item next() throws XPathException
SequenceIterator
next
???? SequenceIterator
XPathException
- if an error occurs retrieving the next itempublic Item current()
SequenceIterator
current
???? SequenceIterator
public int position()
SequenceIterator
This method does not change the state of the iterator.
position
???? 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
???? SequenceIterator
public SequenceIterator getAnother()
SequenceIterator
This method allows access to all the items in the sequence without disturbing the current position of the iterator. Internally, its main use is in evaluating the last() function.
This method does not change the state of the iterator.
getAnother
???? SequenceIterator
public int getLastPosition() throws XPathException
getLastPosition
???? LastPositionFinder
XPathException
public GroundedValue materialize() throws XPathException
materialize
???? GroundedIterator
XPathException
public int getProperties()
getProperties
???? SequenceIterator
SequenceIterator.GROUNDED
and SequenceIterator.LAST_POSITION_FINDER
. It is always
acceptable to return the value zero, indicating that there are no known special properties.