public class SortedIterator extends java.lang.Object implements SequenceIterator, LastPositionFinder, Sortable
Modifier and Type | Field and Description |
---|---|
protected SequenceIterator |
base |
protected java.util.Comparator[] |
comparators |
protected XPathContext |
context |
protected int |
count |
protected int |
index |
protected java.lang.Object[] |
nodeKeys |
protected int |
recordSize |
protected SortKeyDefinition[] |
sortkeys |
ATOMIZABLE, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
---|
SortedIterator(XPathContext context,
SequenceIterator base,
SortKeyDefinition[] sortkeys,
java.util.Comparator[] comparators) |
Modifier and Type | Method and Description |
---|---|
protected void |
buildArray()
Create an array holding the items to be sorted and the values of their sort keys
|
int |
compare(int a,
int b)
Compare two items in sorted sequence
(needed to implement the Sortable interface)
|
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 |
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.
|
Item |
next()
Get the next item, in sorted order
|
int |
position()
Get the current position.
|
void |
setHostLanguage(int language) |
void |
swap(int a,
int b)
Swap two items (needed to implement the Sortable interface)
|
protected SequenceIterator base
protected SortKeyDefinition[] sortkeys
protected java.util.Comparator[] comparators
protected int recordSize
protected java.lang.Object[] nodeKeys
protected int count
protected int index
protected XPathContext context
public SortedIterator(XPathContext context, SequenceIterator base, SortKeyDefinition[] sortkeys, java.util.Comparator[] comparators)
public void setHostLanguage(int language)
public Item next() throws XPathException
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itempublic Item current()
SequenceIterator
current
in interface SequenceIterator
public int position()
SequenceIterator
This method does not change the state of the iterator.
position
in interface SequenceIterator
public int getLastPosition() throws XPathException
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLastPosition
in interface LastPositionFinder
XPathException
public SequenceIterator 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
XPathException
- if any error occurspublic int getProperties()
getProperties
in interface 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.protected void buildArray() throws XPathException
XPathException
public int compare(int a, int b)