org.aksw.commons.collections
Class SinglePrefetchIterator<T>

java.lang.Object
  org.aksw.commons.collections.SinglePrefetchIterator<T>

Type Parameters:

T -

All Implemented Interfaces:

Iterator<T>

Direct Known Subclasses:

WindowedSorterIterator

public abstract class SinglePrefetchIterator<T>
extends Object
implements Iterator<T>

An abstract base class for iterating over containers of unknown size. This works by prefetching junks of the container: Whenever the iterator reaches the end of a chunk, the method "myPrefetch" is called. Note that once the iterator is finished (myPrefetch returned null), myPrefetch will never be called again. This means, that if myPrefetch is called, the iterator hasn't reached its end yet.

Author:

raven_arkadon

Constructor Summary

protected

SinglePrefetchIterator()

Method Summary

void	close() An iterator must always free all resources once done with iteration.
protected T	finish()
boolean	hasNext()
T	next()
protected abstract T	prefetch()
void	remove()

Methods inherited from class java.lang.Object

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

Constructor Detail

SinglePrefetchIterator

protected SinglePrefetchIterator()

Method Detail

prefetch

protected abstract T prefetch()
                       throws Exception

Throws:

Exception

finish

protected T finish()

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

next

public T next()

Specified by:

next in interface Iterator<T>

close

public void close()

An iterator must always free all resources once done with iteration. However, if iteration is aborted, this method should be called.

remove

public void remove()

Specified by:

remove in interface Iterator<T>