net.sf.saxon.instruct
Class BlockIterator

java.lang.Object
  net.sf.saxon.instruct.BlockIterator

All Implemented Interfaces:

SequenceIterator

public class BlockIterator
extends Object
implements SequenceIterator

Iterate over the instructions in the Block, concatenating the result of each instruction into a single combined sequence.

Field Summary

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

GROUNDED, LAST_POSITION_FINDER, LOOKAHEAD

Constructor Summary

BlockIterator(SequenceIterable[] children, XPathContext context)

Method Summary

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	getProperties() Get properties of this iterator, as a bit-significant integer.
Item	next() Get the next item in the sequence.
int	position() Get the current position.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BlockIterator

public BlockIterator(SequenceIterable[] children,
                     XPathContext context)

Method Detail

next

public Item next()
          throws XPathException

Get the next item in the sequence.

Specified by:

next in interface SequenceIterator

Returns:

the next item, or null if there are no more items.

Throws:

XPathException - if an error occurs retrieving the next item

current

public Item current()

Get the current value in the sequence (the one returned by the most recent call on next()). This will be null before the first call of next().

Specified by:

current in interface SequenceIterator

Returns:

the current item, the one most recently returned by a call on next(); or null, if next() has not been called, or if the end of the sequence has been reached.

position

public int position()

Get the current position. This will be zero before the first call on next(), otherwise it will be the number of times that next() has been called.

Specified by:

position in interface SequenceIterator

Returns:

the current position, the position of the item returned by the most recent call of next()

getAnother

public SequenceIterator getAnother()
                            throws XPathException

Get another SequenceIterator that iterates over the same items as the original, but which is repositioned at the start of the sequence.

Specified by:

getAnother in interface SequenceIterator

Returns:

a SequenceIterator that iterates over the same items, positioned before the first item

Throws:

XPathException - if any error occurs

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.