com.bigdata.btree.filter
Class EmptyTupleIterator

java.lang.Object
  com.bigdata.btree.filter.EmptyTupleIterator

All Implemented Interfaces:

ITupleIterator, Iterator

public class EmptyTupleIterator
extends Object
implements ITupleIterator

Empty iterator.

Version:

$Id: EmptyTupleIterator.java 2265 2009-10-26 12:51:06Z thompsonbry $

Author:

Bryan Thompson

Field Summary

static ITupleIterator

INSTANCE

Method Summary

boolean	hasNext()
ITuple	next() Advance the iterator and return the ITuple from which you can extract the data and metadata for next entry.
void	remove()

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final transient ITupleIterator INSTANCE

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator

next

public ITuple next()

Description copied from interface: ITupleIterator

Advance the iterator and return the ITuple from which you can extract the data and metadata for next entry.

Note: An ITupleIterators will generally return the same ITuple reference on on each invocation of this method. The caller is responsible for copying out any data or metadata of interest before calling ITupleIterator.next() again. See TupleFilter which is aware of this and can be used to stack filters safely.

Specified by:

next in interface ITupleIterator

Specified by:

next in interface Iterator

Returns:

The ITuple containing the data and metadata for the current index entry.

remove

public void remove()

Specified by:

remove in interface Iterator