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java.lang.Object net.sf.saxon.expr.TailIterator<T>
public class TailIterator<T extends Item>
TailIterator iterates over a base sequence starting at an element other than the first. The base sequence is represented by an iterator which is consumed in the process
Field Summary |
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Fields inherited from interface net.sf.saxon.om.SequenceIterator |
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GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD |
Method Summary | ||
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void |
close()
Close the iterator. |
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T |
current()
Get the current value in the sequence (the one returned by the most recent call on next()). |
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SequenceIterator<T> |
getAnother()
Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence. |
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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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boolean |
hasNext()
Determine whether there are more items to come. |
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static
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make(SequenceIterator<T> base,
int start)
Static factory method. |
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T |
next()
Get the next item in the sequence. |
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int |
position()
Get the current position. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public static <T extends Item> SequenceIterator<T> make(SequenceIterator<T> base, int start) throws XPathException
base
- An iteration of the items to be filteredstart
- The position of the first item to be included (base 1). If <= 1, the whole of the
base sequence is returned
XPathException
- if a dynamic error occurspublic 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 boolean hasNext()
LookaheadIterator
SequenceIterator.LOOKAHEAD
hasNext
in interface LookaheadIterator<T extends Item>
public int getLength() throws XPathException
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLength
in interface LastPositionFinder<T extends Item>
XPathException
- if an error occurs evaluating the sequence in order to determine
the number of itemspublic 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 SequenceIterator<T> getAnother() throws XPathException
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>
XPathException
- if any error occurspublic int getProperties()
getProperties
in interface SequenceIterator<T extends Item>
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.
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