/**
* 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.sword;
import org.purl.sword.base.AtomDocumentResponse;
import org.purl.sword.base.SWORDErrorException;
import org.purl.sword.base.SWORDEntry;
import org.dspace.content.DSpaceObject;
import org.dspace.content.Bitstream;
/**
* @author Richard Jones
*
* Class to provide tools to manage media links and media entries for sword
*
*/
public class MediaEntryManager
{
/** sword service implementation */
private SWORDService swordService;
public MediaEntryManager(SWORDService swordService)
{
this.swordService = swordService;
}
/**
* Get the media entry for the given URL request. If the URL is
* unavailable this method will throw the appropriate SWORD errors,
* with DSpace custom URLs.
*
* @param url
* @throws DSpaceSWORDException
* @throws SWORDErrorException
*/
public AtomDocumentResponse getMediaEntry(String url)
throws DSpaceSWORDException, SWORDErrorException
{
SWORDUrlManager urlManager = swordService.getUrlManager();
AtomDocumentResponse response = new AtomDocumentResponse(200);
if (url == null || urlManager.isBaseMediaLinkUrl(url))
{
// we are dealing with a default media-link, indicating that something
// is wrong
// FIXME: what do we actually do about this situation?
// throwing an error for the time being
throw new SWORDErrorException(DSpaceSWORDErrorCodes.MEDIA_UNAVAILABLE, "The media link you requested is not available");
}
// extract the thing that we are trying to get a media entry on
DSpaceObject dso = urlManager.extractDSpaceObject(url);
// now, the media entry should always be to an actual file, so we only care that this is a bitstream
if (!(dso instanceof Bitstream))
{
throw new SWORDErrorException(DSpaceSWORDErrorCodes.BAD_URL, "The url you provided does not resolve to an appropriate object");
}
// now construct the atom entry for the bitstream
DSpaceATOMEntry dsatom = new BitstreamEntryGenerator(swordService);
SWORDEntry entry = dsatom.getSWORDEntry(dso);
response.setEntry(entry);
return response;
}
}