public class EmptyIterator extends java.lang.Object implements AxisIterator, ReversibleIterator, LastPositionFinder, GroundedIterator, LookaheadIterator
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
?????? | ????? |
---|---|
Value |
atomize()
Return the atomized value of the current node.
|
void |
close()
Close the iterator.
|
Item |
current()
Get the current item, that is, the item returned by the most recent call of next().
|
SequenceIterator |
getAnother()
Get another iterator over the same items, positioned at the start.
|
static EmptyIterator |
getInstance()
Get an EmptyIterator, an iterator over an empty sequence.
|
int |
getLastPosition()
Get the position of the last item in the sequence.
|
int |
getProperties()
Get properties of this iterator, as a bit-significant integer.
|
SequenceIterator |
getReverseIterator()
Get another iterator over the same items, in reverse order.
|
java.lang.CharSequence |
getStringValue()
Return the string value of the current node.
|
boolean |
hasNext()
Determine whether there are more items to come.
|
AxisIterator |
iterateAxis(byte axis,
NodeTest test)
Return an iterator over an axis, starting at the current node.
|
GroundedValue |
materialize()
Return a Value containing all the items in the sequence returned by this
SequenceIterator.
|
boolean |
moveNext()
Move to the next node, without returning it.
|
Item |
next()
Get the next item.
|
int |
position()
Get the position of the current item.
|
public static EmptyIterator getInstance()
public boolean moveNext()
moveNext
???? AxisIterator
public Item next()
next
???? SequenceIterator
next
???? UnfailingIterator
public Item current()
current
???? SequenceIterator
current
???? UnfailingIterator
public int position()
position
???? SequenceIterator
position
???? UnfailingIterator
public int getLastPosition()
getLastPosition
???? LastPositionFinder
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 AxisIterator iterateAxis(byte axis, NodeTest test)
iterateAxis
???? AxisIterator
axis
- the axis to iterate over, using a constant such as
Axis.CHILD
test
- a predicate to apply to the nodes before returning them.java.lang.NullPointerException
- if there is no current nodepublic Value atomize() throws XPathException
atomize
???? AxisIterator
java.lang.NullPointerException
- if there is no current nodeXPathException
public java.lang.CharSequence getStringValue()
getStringValue
???? AxisIterator
java.lang.NullPointerException
- if there is no current nodepublic SequenceIterator getAnother()
getAnother
???? SequenceIterator
getAnother
???? UnfailingIterator
public SequenceIterator getReverseIterator()
getReverseIterator
???? ReversibleIterator
public int getProperties()
getProperties
???? 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 GroundedValue materialize()
materialize
???? GroundedIterator
public boolean hasNext()
hasNext
???? LookaheadIterator