net.sf.saxon.evpull
Class BlockEventIterator

java.lang.Object
  net.sf.saxon.evpull.BlockEventIterator

All Implemented Interfaces:

EventIterator, PullEvent

public class BlockEventIterator
extends Object
implements EventIterator

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

Constructor Summary

BlockEventIterator(Expression[] children, XPathContext context)
Create an EventIterator over the results of evaluating a Block

Method Summary

boolean	isFlatSequence() Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators
PullEvent	next() Get the next item in the sequence.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockEventIterator

public BlockEventIterator(Expression[] children,
                          XPathContext context)

Create an EventIterator over the results of evaluating a Block

Parameters:

children - the sequence of instructions comprising the Block

context - the XPath dynamic context

Method Detail

next

public PullEvent next()
               throws XPathException

Get the next item in the sequence.

Specified by:

next in interface EventIterator

Returns:

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

Throws:

XPathException - if an error occurs retrieving the next item

isFlatSequence

public boolean isFlatSequence()

Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators

Specified by:

isFlatSequence in interface EventIterator

Returns:

true if the next() method is guaranteed never to return an EventIterator