/*
* 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.sql.SQLException;
import org.dspace.core.PluginManager;
/**
* Decorator that dispatches a specified number of bitstreams from a delegate
* dispatcher.
*
* @author Jim Downing
* @author Grace Carpenter
* @author Nathan Sarr
*
*/
public class LimitedCountDispatcher implements BitstreamDispatcher
{
/** The remaining number of bitstreams to iterate through. */
private int remaining = 1;
/** The dispatcher to delegate to for retrieving bitstreams. */
private BitstreamDispatcher delegate = null;
/**
* Default constructor uses PluginManager
*/
public LimitedCountDispatcher()
{
this((BitstreamDispatcher) PluginManager
.getSinglePlugin(BitstreamDispatcher.class));
}
/**
* Constructor.
*
* @param del
* The bitstream distpatcher to delegate to.
* @param count
* the number of bitstreams to check.
*/
public LimitedCountDispatcher(BitstreamDispatcher del, int count)
{
this(del);
remaining = count;
}
/**
* Constructor.
*
* @param del
* The bitstream distpatcher to delegate to.
*/
public LimitedCountDispatcher(BitstreamDispatcher del)
{
delegate = del;
}
/**
* Retreives the next bitstream to be checked.
*
* @return the bitstream id
* @throws SQLException
* if database error occurs.
*/
public int next()
{
if (remaining > 0)
{
remaining--;
return delegate.next();
}
else
{
return BitstreamDispatcher.SENTINEL;
}
}
}