public class SortedIterator extends java.lang.Object implements SequenceIterator, LastPositionFinder, LookaheadIterator
Modifier and Type | Field and Description |
---|---|
protected SequenceIterator |
base |
protected AtomicComparer[] |
comparators |
protected XPathContext |
context |
protected int |
count |
protected int |
position |
protected SortKeyEvaluator |
sortKeyEvaluator |
protected ObjectToBeSorted[] |
values |
Modifier | Constructor and Description |
---|---|
protected |
SortedIterator() |
|
SortedIterator(XPathContext context,
SequenceIterator base,
SortKeyEvaluator sortKeyEvaluator,
AtomicComparer[] comparators,
boolean createNewContext)
Create a sorted iterator
|
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 |
getLength()
Get the last position (that is, the number of items in the sequence).
|
boolean |
hasNext()
Determine whether there are more items to come.
|
Item |
next()
Get the next item, in sorted order
|
void |
setHostLanguage(HostLanguage language)
Set the host language
|
boolean |
supportsGetLength()
Ask whether this iterator supports use of the
getLength() method. |
boolean |
supportsHasNext()
Ask whether the hasNext() method can be called.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
close, discharge
protected SequenceIterator base
protected SortKeyEvaluator sortKeyEvaluator
protected AtomicComparer[] comparators
protected ObjectToBeSorted[] values
protected int count
protected int position
protected XPathContext context
protected SortedIterator()
public SortedIterator(XPathContext context, SequenceIterator base, SortKeyEvaluator sortKeyEvaluator, AtomicComparer[] comparators, boolean createNewContext)
context
- the dynamic XPath evaluation contextbase
- an iterator over the sequence to be sortedsortKeyEvaluator
- an object that allows the n'th sort key for a given item to be evaluatedcomparators
- an array of AtomicComparers, one for each sort key, for comparing sort key valuescreateNewContext
- true if sort keys are computed relative to the item being sorted (as in XSLT but not XQuery)public void setHostLanguage(HostLanguage language)
language
- the host language (for example HostLanguage.XQUERY
)public boolean supportsHasNext()
LookaheadIterator
supportsHasNext
in interface LookaheadIterator
LookaheadIterator.hasNext()
method is availablepublic boolean hasNext()
This method must not be called unless the method supportsHasNext()
returns true.
hasNext
in interface LookaheadIterator
public Item next()
next
in interface SequenceIterator
public boolean supportsGetLength()
getLength()
method. This
method should always be called before calling getLength()
, because an iterator
that implements this interface may support use of getLength()
in some situations
and not in otherssupportsGetLength
in interface LastPositionFinder
getLength()
method can be called to determine the length
of the underlying sequence.public int getLength()
LastPositionFinder
LastPositionFinder.supportsGetLength()
has been called
and has returned true.getLength
in interface LastPositionFinder
protected void buildArray() throws XPathException
XPathException
- if an error occurs for example in evaluating a sort keyCopyright (c) 2004-2022 Saxonica Limited. All rights reserved.