net.sf.saxon.evpull
Class TracingEventIterator

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

All Implemented Interfaces:

EventIterator, PullEvent

public class TracingEventIterator
extends Object
implements EventIterator

This class is a filter for a sequence of pull events; it returns the input sequence unchanged, but traces execution to System.err

Constructor Summary

TracingEventIterator(EventIterator base)
Create an event iterator that traces all events received from the base sequence, and returns them unchanged

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 event in the sequence

Methods inherited from class java.lang.Object

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

Constructor Detail

TracingEventIterator

public TracingEventIterator(EventIterator base)

Create an event iterator that traces all events received from the base sequence, and returns them unchanged

Parameters:

base - the iterator over the base sequence

Method Detail

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

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