public class MemoSequence extends java.lang.Object implements Sequence
Modifier and Type | Class and Description |
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class |
MemoSequence.ProgressiveIterator
A ProgressiveIterator starts by reading any items already held in the reservoir;
when the reservoir is exhausted, it reads further items from the inputIterator,
copying them into the reservoir as they are read.
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Modifier and Type | Field and Description |
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protected static int |
EMPTY |
protected int |
state |
Constructor and Description |
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MemoSequence(SequenceIterator iterator) |
Modifier and Type | Method and Description |
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Item |
head()
Get the first item in the sequence.
|
Item |
itemAt(int n)
Get the Nth item in the sequence (0-based), reading new items into the internal reservoir if necessary
|
SequenceIterator |
iterate()
Get an iterator over all the items in the sequence
|
protected int state
protected static final int EMPTY
public MemoSequence(SequenceIterator iterator)
public Item head() throws XPathException
Sequence
head
in interface Sequence
XPathException
- in the situation where the sequence is evaluated lazily, and
evaluation of the first item causes a dynamic error.public SequenceIterator iterate() throws XPathException
Sequence
iterate
in interface Sequence
XPathException
- in the situation where the sequence is evaluated lazily, and
constructing an iterator over the items causes a dynamic error.public Item itemAt(int n) throws XPathException
n
- the index of the required itemXPathException
- if the input sequence cannot be readCopyright (c) 2004-2018 Saxonica Limited. All rights reserved.