public class SingletonIterator extends java.lang.Object implements UnfailingIterator, ReversibleIterator, LastPositionFinder, GroundedIterator, LookaheadIterator
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
?????? | ????? |
---|---|
void |
close()
Close the iterator.
|
Item |
current()
Get the current item in the sequence.
|
SequenceIterator |
getAnother()
Get another iterator over the same sequence of items, positioned 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.
|
SequenceIterator |
getReverseIterator()
Get a new SequenceIterator that returns the same items in reverse order.
|
Item |
getValue() |
boolean |
hasNext()
Determine whether there are more items to come.
|
static UnfailingIterator |
makeIterator(Item item)
Factory method.
|
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()
Return the current position in the sequence.
|
public static UnfailingIterator makeIterator(Item item)
item
- the item to iterate overpublic boolean hasNext()
hasNext
???? LookaheadIterator
public Item next()
UnfailingIterator
next
???? SequenceIterator
next
???? UnfailingIterator
public Item current()
UnfailingIterator
current
???? SequenceIterator
current
???? UnfailingIterator
public int position()
position
???? SequenceIterator
position
???? UnfailingIterator
public int getLastPosition()
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
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 SequenceIterator getAnother()
UnfailingIterator
getAnother
???? SequenceIterator
getAnother
???? UnfailingIterator
public SequenceIterator getReverseIterator()
ReversibleIterator
getReverseIterator
???? ReversibleIterator
public Item getValue()
public GroundedValue materialize()
materialize
???? GroundedIterator
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.