net.sf.saxon.expr

Class AppendIterator

Implemented Interfaces:
SequenceIterator

public class AppendIterator
extends java.lang.Object
implements SequenceIterator

Iterator that concatenates the results of two supplied iterators

Fields inherited from interface net.sf.saxon.om.SequenceIterator

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

AppendIterator(SequenceIterator first, SequenceIterable second, XPathContext context)
This form of constructor is designed to delay getting an iterator for the second expression until it is actually needed.

Method Summary

Item
current()
SequenceIterator
getAnother()
int
getProperties()
Get properties of this iterator, as a bit-significant integer.
Item
next()
int
position()

Constructor Details

AppendIterator

public AppendIterator(SequenceIterator first,
                      SequenceIterable second,
                      XPathContext context)
This form of constructor is designed to delay getting an iterator for the second expression until it is actually needed. This gives savings in cases where the iteration is aborted prematurely.
Parameters:
first - Iterator over the first operand
second - The second operand
context - The dynamic context for evaluation of the second operand

Method Details

current

public Item current()
Specified by:
current in interface SequenceIterator

getAnother

public SequenceIterator getAnother()
            throws XPathException
Specified by:
getAnother in interface SequenceIterator

getProperties

public int getProperties()
Get properties of this iterator, as a bit-significant integer.
Specified by:
getProperties in interface SequenceIterator
Returns:
the properties of this iterator. This will be some combination of properties such as 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.

next

public Item next()
            throws XPathException
Specified by:
next in interface SequenceIterator

position

public int position()
Specified by:
position in interface SequenceIterator