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java.lang.Objectnet.sf.saxon.tree.iter.LookaheadIteratorImpl
public class LookaheadIteratorImpl
This class wraps any sequence iterator, turning it into a lookahead iterator, by looking ahead one item
| Field Summary |
|---|
| Fields inherited from interface net.sf.saxon.om.SequenceIterator |
|---|
GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD |
| Method Summary | |
|---|---|
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. |
boolean |
hasNext()
Determine whether there are more items to come. |
static LookaheadIterator |
makeLookaheadIterator(SequenceIterator base)
|
Item |
next()
Get the next item in the sequence. |
int |
position()
Get the current position. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Method Detail |
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public static LookaheadIterator makeLookaheadIterator(SequenceIterator base)
throws XPathException
XPathExceptionpublic boolean hasNext()
LookaheadIteratorSequenceIterator.LOOKAHEAD
hasNext in interface LookaheadIterator
public Item next()
throws XPathException
SequenceIterator
next in interface SequenceIteratorXPathException - if an error occurs retrieving the next itempublic Item current()
SequenceIterator
current in interface SequenceIteratorpublic int position()
SequenceIteratorThis method does not change the state of the iterator.
position in interface SequenceIteratorpublic 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
public SequenceIterator getAnother()
throws XPathException
SequenceIteratorThis 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 SequenceIteratorXPathException - if any error occurspublic int getProperties()
SequenceIterator
getProperties in interface SequenceIteratorSequenceIterator.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.
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