net.sf.saxon.evpull
Class PullEventTracer

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

All Implemented Interfaces:

EventIterator, PullEvent

public class PullEventTracer
extends Object
implements EventIterator

Diagnostic class to display the sequence of events reported by an EventIterator

Constructor Summary

PullEventTracer(EventIterator base, Configuration config)
Create a tracer for pull events

Method Summary

boolean	isFlatSequence() Determine whether the EventIterator returns a flat sequence of events, or whether it can return nested event iterators
static void	main(String[] args) Main method for testing only
PullEvent	next() Get the next event in the sequence

Methods inherited from class java.lang.Object

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

Constructor Detail

PullEventTracer

public PullEventTracer(EventIterator base,
                       Configuration config)

Create a tracer for pull events

Parameters:

base - the event iterator whose events are to be traced

config - the Saxon configuration

Method Detail

next

public PullEvent next()
               throws XPathException

Get the next event in the sequence

Specified by:

next in interface EventIterator

Returns:

the next event, or null when the sequence is exhausted. Note that since an EventIterator is itself a PullEvent, this method may return a nested iterator.

Throws:

XPathException - if a dynamic evaluation error occurs

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

main

public static void main(String[] args)
                 throws Exception

Main method for testing only

Parameters:

args - not used

Throws:

Exception