/**
* 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.Arrays;
import java.util.Iterator;
import org.apache.log4j.Logger;
import org.dspace.content.Bitstream;
import org.dspace.content.DSpaceObject;
import org.dspace.content.factory.ContentServiceFactory;
import org.dspace.content.service.BitstreamService;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.handle.factory.HandleServiceFactory;
import org.dspace.handle.service.HandleService;
/**
* 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);
protected Context context;
/** Handle to retrieve bitstreams from. */
protected String handle = null;
/** Has the type of object the handle refers to been determined. */
protected boolean init = false;
/** the delegate to dispatch to. */
protected IteratorDispatcher delegate = null;
protected BitstreamService bitstreamService = ContentServiceFactory.getInstance().getBitstreamService();
protected HandleService handleService = HandleServiceFactory.getInstance().getHandleService();
/**
* Blanked off, no-op constructor.
*/
private HandleDispatcher()
{
}
/**
* Main constructor.
*
* @param context Context
* @param hdl
* the handle to get bitstreams from.
*/
public HandleDispatcher(Context context, String hdl)
{
this.context = context;
handle = hdl;
}
/**
* Private initialization routine.
*
* @throws SQLException if database error
* if database access fails.
*/
protected synchronized void init() throws SQLException {
if (!init)
{
DSpaceObject dso = handleService.resolveToObject(context, handle);
Iterator<Bitstream> ids = new ArrayList<Bitstream>().iterator();
switch (dso.getType())
{
case Constants.BITSTREAM:
ids = Arrays.asList(((Bitstream) dso)).iterator();
break;
case Constants.ITEM:
ids = bitstreamService.getItemBitstreams(context, (org.dspace.content.Item) dso);
break;
case Constants.COLLECTION:
ids = bitstreamService.getCollectionBitstreams(context, (org.dspace.content.Collection) dso);
break;
case Constants.COMMUNITY:
ids = bitstreamService.getCommunityBitstreams(context, (org.dspace.content.Community) dso);
break;
}
delegate = new IteratorDispatcher(ids);
init = true;
}
}
/**
* Initializes this dispatcher on first execution.
*
* @throws SQLException if database error
* @see org.dspace.checker.BitstreamDispatcher#next()
*/
@Override
public Bitstream next() throws SQLException {
if (!init)
{
init();
}
return delegate.next();
}
}