/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Oct 19, 2010
*/
package com.bigdata.relation.accesspath;
import cutthecrap.utils.striterators.ICloseableIterator;
/**
* An interface which permits new sources to be attached dynamically. The
* decision to accept a new source via {@link #add(ICloseableIterator)} or to
* {@link IMultiSourceCloseableIterator#close()} the iterator must be atomic.
* In particular, it is illegal for a source to be accepted after the iterator
* has been closed.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public interface IMultiSourceCloseableIterator<E> extends
ICloseableIterator<E> {
/**
* Add a source. If the iterator already reports that it is closed then the
* new source can not be added and this method will return false.
*
* @param src
* The source.
* @return <code>true</code> iff the source could be added.
*/
boolean add(ICloseableIterator<E> src);
}