/*******************************************************************************
* Copyright 2010 Cees De Groot, Alex Boisvert, Jan Kotek
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package de.mxro.thrd.jdbm2V22.helper;
import java.io.IOException;
/**
* Browser to traverse a collection of tuples. The browser allows for
* forward and reverse order traversal.
*
* @author <a href="mailto:boisvert@intalio.com">Alex Boisvert</a>
* @version $Id: TupleBrowser.java,v 1.2 2001/05/19 14:02:00 boisvert Exp $
*/
public interface TupleBrowser<K,V> {
/**
* Get the next tuple.
*
* @param tuple Tuple into which values are copied.
* @return True if values have been copied in tuple, or false if there is
* no next tuple.
*/
public abstract boolean getNext( Tuple<K,V> tuple )
throws IOException;
/**
* Get the previous tuple.
*
* @param tuple Tuple into which values are copied.
* @return True if values have been copied in tuple, or false if there is
* no previous tuple.
*/
public abstract boolean getPrevious( Tuple<K,V> tuple )
throws IOException;
}