/*
* Copyright (c) 2002-2009, The DSpace Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the DSpace Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.dspace.checker;
import java.util.Collections;
import java.util.EmptyStackException;
import java.util.List;
import java.util.Stack;
/**
* Really simple dispatcher that just iterates over a pre-defined list of ids.
*
* @author Jim Downing
* @author Grace Carpenter
* @author Nathan Sarr
*
*/
public class ListDispatcher implements BitstreamDispatcher
{
/**
* List of Integer ids.
*/
Stack bitstreams = new Stack();
/**
* Blanked off, no-op constructor. Do not use.
*/
private ListDispatcher()
{
;
}
/**
* Main constructor.
*
* @param bitstreamIds
* List of Integer ids to dispatch.
*/
public ListDispatcher(List bitstreamIds)
{
Collections.reverse(bitstreamIds);
bitstreams.addAll(bitstreamIds);
}
/**
* @see org.dspace.checker.BitstreamDispatcher#next()
*/
public synchronized int next()
{
try
{
return ((Integer) bitstreams.pop()).intValue();
}
catch (EmptyStackException e)
{
return SENTINEL;
}
}
}