/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.checker;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import org.dspace.content.DSpaceObject;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.handle.HandleManager;
/**
* A BitstreamDispatcher that checks all the bitstreams contained within an
* item, collection or community referred to by Handle.
*
* @author Jim Downing
* @author Grace Carpenter
* @author Nathan Sarr
*
*/
public class HandleDispatcher implements BitstreamDispatcher
{
/** Log 4j logger. */
private static final Logger LOG = Logger.getLogger(HandleDispatcher.class);
/** Handle to retrieve bitstreams from. */
private String handle = null;
/** Has the type of object the handle refers to been determined. */
private boolean init = false;
/** the delegate to dispatch to. */
private ListDispatcher delegate = null;
/**
* Database access for retrieving bitstreams
*/
BitstreamInfoDAO bitstreamInfoDAO;
/**
* Blanked off, no-op constructor.
*/
private HandleDispatcher()
{
}
/**
* Main constructor.
*
* @param hdl
* the handle to get bitstreams from.
*/
public HandleDispatcher(BitstreamInfoDAO bitInfoDAO, String hdl)
{
bitstreamInfoDAO = bitInfoDAO;
handle = hdl;
}
/**
* Private initialization routine.
*
* @throws SQLException
* if database access fails.
*/
private synchronized void init()
{
if (!init)
{
Context context = null;
int dsoType = -1;
int id = -1;
try
{
context = new Context();
DSpaceObject dso = HandleManager.resolveToObject(context, handle);
id = dso.getID();
dsoType = dso.getType();
context.abort();
}
catch (SQLException e)
{
LOG.error("init error " + e.getMessage(), e);
throw new IllegalStateException("init error" + e.getMessage(), e);
}
finally
{
// Abort the context if it's still valid
if ((context != null) && context.isValid())
{
context.abort();
}
}
List<Integer> ids = new ArrayList<Integer>();
switch (dsoType)
{
case Constants.BITSTREAM:
ids.add(Integer.valueOf(id));
break;
case Constants.ITEM:
ids = bitstreamInfoDAO.getItemBitstreams(id);
break;
case Constants.COLLECTION:
ids = bitstreamInfoDAO.getCollectionBitstreams(id);
break;
case Constants.COMMUNITY:
ids = bitstreamInfoDAO.getCommunityBitstreams(id);
break;
}
delegate = new ListDispatcher(ids);
init = true;
}
}
/**
* Initializes this dispatcher on first execution.
*
* @see org.dspace.checker.BitstreamDispatcher#next()
*/
public int next()
{
if (!init)
{
init();
}
return delegate.next();
}
}