public abstract class OneToOneMappingIterator extends java.lang.Object implements SequenceIterator, LookaheadIterator, LastPositionFinder
Modifier and Type | Field and Description |
---|---|
protected XPathContext |
context |
ATOMIZING, GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD
Constructor and Description |
---|
OneToOneMappingIterator() |
Modifier and Type | Method and Description |
---|---|
void |
close()
Close the iterator.
|
int |
getLength()
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.
|
boolean |
hasNext()
Determine whether there are more items to come.
|
protected abstract Item |
map(Item baseItem)
Abstract method to be supplied in subclasses to map an item from the input sequence
to an item in the output sequence
|
Item |
next()
Get the next item in the sequence.
|
void |
setSequence(SequenceIterator base,
XPathContext context) |
protected XPathContext context
public void setSequence(SequenceIterator base, XPathContext context)
public boolean hasNext()
LookaheadIterator
SequenceIterator.LOOKAHEAD
hasNext
in interface LookaheadIterator
public Item next() throws XPathException
SequenceIterator
next
in interface SequenceIterator
XPathException
- if an error occurs retrieving the next itemprotected abstract Item map(Item baseItem) throws XPathException
baseItem
- the item in the input (base) sequenceXPathException
public 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 int getLength() throws XPathException
LastPositionFinder
SequenceIterator.LAST_POSITION_FINDER
getLength
in interface LastPositionFinder
XPathException
- if an error occurs evaluating the sequence in order to determine
the number of itemspublic 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.Copyright (c) 2004-2018 Saxonica Limited. All rights reserved.