/*
VisAD system for interactive analysis and visualization of numerical
data. Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
$Id: DataInputStream.java,v 1.7 2009-03-02 23:35:48 curtis Exp $
*/
package visad.data.in;
import java.rmi.RemoteException;
import visad.*;
/**
* Interface for a filter-module in a data-import pipe. In general, such
* a filter-module obtains VisAD data objects its upstream data source and
* transforms them in some way before passing them on.
*
* @author Steven R. Emmerson
*/
public interface DataInputStream
{
/**
* Returns the next VisAD data object in the input stream. Returns
* <code>null</code> if there is no next object.
*
* @return A VisAD data object or <code>null</code> if
* there are no more such objects.
* @throws VisADException VisAD failure.
* @throws RemoteException Java RMI failure.
*/
DataImpl readData()
throws VisADException, RemoteException;
}