/*
* RetrieveServlet.java
*
* Version: $Revision: 4430 $
*
* Date: $Date: 2009-10-10 17:21:30 +0000 (Sat, 10 Oct 2009) $
*
* Copyright (c) 2002-2005, Hewlett-Packard Company and Massachusetts
* Institute of Technology. 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 Hewlett-Packard Company nor the name of the
* Massachusetts Institute of Technology nor the names of their
* 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.app.webui.servlet;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.dspace.app.webui.util.JSPManager;
import org.dspace.authorize.AuthorizeException;
import org.dspace.content.Bitstream;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.core.LogManager;
import org.dspace.core.Utils;
import org.dspace.usage.UsageEvent;
import org.dspace.utils.DSpace;
/**
* Servlet for retrieving bitstreams. The bits are simply piped to the user.
* <P>
* <code>/retrieve/bitstream-id</code>
*
* @author Robert Tansley
* @version $Revision: 4430 $
*/
public class RetrieveServlet extends DSpaceServlet
{
/** log4j category */
private static Logger log = Logger.getLogger(RetrieveServlet.class);
protected void doDSGet(Context context, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException,
SQLException, AuthorizeException
{
Bitstream bitstream = null;
// Get the ID from the URL
String idString = request.getPathInfo();
if (idString != null)
{
// Remove leading slash
if (idString.startsWith("/"))
{
idString = idString.substring(1);
}
// If there's a second slash, remove it and anything after it,
// it might be a filename
int slashIndex = idString.indexOf('/');
if (slashIndex != -1)
{
idString = idString.substring(0, slashIndex);
}
// Find the corresponding bitstream
try
{
int id = Integer.parseInt(idString);
bitstream = Bitstream.find(context, id);
}
catch (NumberFormatException nfe)
{
// Invalid ID - this will be dealt with below
}
}
// Did we get a bitstream?
if (bitstream != null)
{
log.info(LogManager.getHeader(context, "view_bitstream",
"bitstream_id=" + bitstream.getID()));
new DSpace().getEventService().fireEvent(
new UsageEvent(
UsageEvent.Action.VIEW,
request,
context,
bitstream));
//UsageEvent ue = new UsageEvent();
// ue.fire(request, context, AbstractUsageEvent.VIEW,
//Constants.BITSTREAM, bitstream.getID());
// Pipe the bits
InputStream is = bitstream.retrieve();
// Set the response MIME type
response.setContentType(bitstream.getFormat().getMIMEType());
// Response length
response.setHeader("Content-Length", String.valueOf(bitstream
.getSize()));
Utils.bufferedCopy(is, response.getOutputStream());
is.close();
response.getOutputStream().flush();
}
else
{
// No bitstream - we got an invalid ID
log.info(LogManager.getHeader(context, "view_bitstream",
"invalid_bitstream_id=" + idString));
JSPManager.showInvalidIDError(request, response, idString,
Constants.BITSTREAM);
}
}
}