org.archive.queue
Class DiskQueueIterator

java.lang.Object
  org.archive.queue.DiskQueueIterator

All Implemented Interfaces:

java.util.Iterator

public class DiskQueueIterator
extends java.lang.Object
implements java.util.Iterator

An iterator for DiskQueue. It iterates through items queued up in a file. Does this without changing the file. As a result the remove method does nothing.

Author:

Kristinn Sigurdsson

Field Summary

(package private) java.io.InputStream	inStream
(package private) long	length
(package private) java.io.ObjectInputStream	objectInStream

Constructor Summary

DiskQueueIterator(java.io.InputStream inStream, long length)
Constructor

Method Summary

boolean	hasNext()
java.lang.Object	next()
void	remove() Not supported

Methods inherited from class java.lang.Object

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

Field Detail

inStream

java.io.InputStream inStream

objectInStream

java.io.ObjectInputStream objectInStream

length

long length

Constructor Detail

DiskQueueIterator

public DiskQueueIterator(java.io.InputStream inStream,
                         long length)
                  throws java.io.IOException

Constructor

Parameters:

inStream - InputStream containing serialized objects

length - The number of items in the stream. If this number is too large, the hasNext will falsely return true when we reach the end of the queue and the next call to next will result in an exception being thrown. If the number is too small hasNext will return false while there are still items in the queue.

Throws:

java.io.IOException

Method Detail

remove

public void remove()

Not supported

Specified by:

remove in interface java.util.Iterator

Throws:

java.lang.UnsupportedOperationException - if invoked

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator

next

public java.lang.Object next()

Specified by:

next in interface java.util.Iterator