public class SequenceComposer extends java.lang.Object implements SequenceIterator
Note: this SequenceIterator does not implement the getAnother()
method, which limits its use,
since getAnother()
is needed to support the XPath last()
function.
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
?????? |
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SequenceComposer(EventIterator iter,
PipelineConfiguration pipe)
Create a sequence composer
|
?????? | ????? |
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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 |
getProperties()
Get properties of this iterator, as a bit-significant integer.
|
static void |
main(java.lang.String[] args)
Main method for testing only
|
Item |
next()
Get the next item in the sequence.
|
int |
position()
Get the current position.
|
public SequenceComposer(EventIterator iter, PipelineConfiguration pipe)
iter
- the underlying event iteratorpipe
- the pipeline configurationpublic Item next() throws XPathException
next
???? SequenceIterator
XPathException
- if an error occurs retrieving the next itempublic Item current()
current
???? 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() throws XPathException
getAnother
???? SequenceIterator
XPathException
- if any error occurspublic 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 int position()
position
???? SequenceIterator
public static void main(java.lang.String[] args) throws java.lang.Exception
args
- not usedjava.lang.Exception