public final class MemoClosure.ProgressiveIterator extends Object implements SequenceIterator<T>, LastPositionFinder<T>, GroundedIterator<T>
Modifier and Type | Field and Description |
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(package private) int |
position |
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
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ProgressiveIterator()
Create a ProgressiveIterator
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Modifier and Type | Method and Description |
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void |
close()
Close the iterator.
|
T |
current()
Get the current value in the sequence (the one returned by the
most recent call on next()).
|
MemoClosure.ProgressiveIterator |
getAnother()
Get another SequenceIterator that iterates over the same items as the original,
but which is repositioned at the start of the sequence.
|
int |
getLength()
Get the last position (that is, the number of items in the sequence)
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int |
getProperties()
Get properties of this iterator, as a bit-significant integer.
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GroundedValue |
materialize()
Return a value containing all the items in the sequence returned by this
SequenceIterator
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T |
next()
Get the next item in the sequence.
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int |
position()
Get the current position.
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public T next() throws XPathException
SequenceIterator
next
in interface SequenceIterator<T extends Item>
XPathException
- if an error occurs retrieving the next itempublic T current()
SequenceIterator
current
in interface SequenceIterator<T extends Item>
public int position()
SequenceIterator
This method does not change the state of the iterator.
position
in interface SequenceIterator<T extends Item>
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
in interface SequenceIterator<T extends Item>
public MemoClosure.ProgressiveIterator 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
in interface SequenceIterator<T extends Item>
public int getLength() throws XPathException
getLength
in interface LastPositionFinder<T extends Item>
XPathException
- if an error occurs evaluating the sequence in order to determine
the number of itemspublic GroundedValue materialize() throws XPathException
materialize
in interface GroundedIterator<T extends Item>
XPathException
- if an error occurs evaluating the sequencepublic int getProperties()
getProperties
in interface SequenceIterator<T extends Item>
SequenceIterator.GROUNDED
and SequenceIterator.LAST_POSITION_FINDER
. It is always
acceptable to return the value zero, indicating that there are no known special properties.