org.dspace.app.xmlui.cocoon
Class ItemExportDownloadReader

java.lang.Object
  org.apache.cocoon.util.AbstractLogEnabled
      org.apache.cocoon.reading.AbstractReader
          org.dspace.app.xmlui.cocoon.ItemExportDownloadReader

All Implemented Interfaces:

org.apache.avalon.excalibur.pool.Poolable, org.apache.avalon.excalibur.pool.Recyclable, org.apache.cocoon.reading.Reader, org.apache.cocoon.sitemap.SitemapModelComponent, org.apache.cocoon.sitemap.SitemapOutputComponent

public class ItemExportDownloadReader
extends org.apache.cocoon.reading.AbstractReader
implements org.apache.avalon.excalibur.pool.Recyclable

Author:

Jay Paz

Field Summary

protected static int	BUFFER_SIZE How big of a buffer should we use when reading from the bitstream before writting to the HTTP response?
protected InputStream	compressedExportInputStream The bitstream file
protected String	compressedExportName
protected long	compressedExportSize The compressed export's reported size
protected static int	expires When should a download expire in milliseconds.
protected org.apache.cocoon.environment.Request	request The Cocoon request
protected org.apache.cocoon.environment.Response	response The Cocoon response

Fields inherited from class org.apache.cocoon.reading.AbstractReader

objectModel, out, parameters, resolver, source

Fields inherited from interface org.apache.cocoon.reading.Reader

ROLE

Constructor Summary

ItemExportDownloadReader()

Method Summary

void	generate() Write the actual data out to the response.
String	getMimeType() Returns the mime-type of the bitstream.
void	recycle() Recycle
void	setup(org.apache.cocoon.environment.SourceResolver resolver, Map objectModel, String src, org.apache.avalon.framework.parameters.Parameters par) Set up the export reader.

Methods inherited from class org.apache.cocoon.reading.AbstractReader

getLastModified, setOutputStream, shouldSetContentLength

Methods inherited from class org.apache.cocoon.util.AbstractLogEnabled

getLogger, setLogger

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BUFFER_SIZE

protected static final int BUFFER_SIZE

How big of a buffer should we use when reading from the bitstream before writting to the HTTP response?

See Also:

Constant Field Values

expires

protected static final int expires

When should a download expire in milliseconds. This should be set to some low value just to prevent someone hiting DSpace repeatily from killing the server. Note: 60000 milliseconds are in a second. Format: minutes * seconds * milliseconds

See Also:

Constant Field Values

response

protected org.apache.cocoon.environment.Response response

The Cocoon response

request

protected org.apache.cocoon.environment.Request request

The Cocoon request

compressedExportInputStream

protected InputStream compressedExportInputStream

The bitstream file

compressedExportSize

protected long compressedExportSize

The compressed export's reported size

compressedExportName

protected String compressedExportName

Constructor Detail

ItemExportDownloadReader

public ItemExportDownloadReader()

Method Detail

setup

public void setup(org.apache.cocoon.environment.SourceResolver resolver,
                  Map objectModel,
                  String src,
                  org.apache.avalon.framework.parameters.Parameters par)
           throws org.apache.cocoon.ProcessingException,
                  SAXException,
                  IOException

Set up the export reader. See the class description for information on configuration options.

Specified by:

setup in interface org.apache.cocoon.sitemap.SitemapModelComponent

Overrides:

setup in class org.apache.cocoon.reading.AbstractReader

Throws:

org.apache.cocoon.ProcessingException

SAXException

IOException

generate

public void generate()
              throws IOException,
                     SAXException,
                     org.apache.cocoon.ProcessingException

Write the actual data out to the response. Some implementation notes, 1) We set a short expires time just in the hopes of preventing someone from overloading the server by clicking reload a bunch of times. I realize that this is nowhere near 100% effective but it may help in some cases and shouldn't hurt anything.

Specified by:

generate in interface org.apache.cocoon.reading.Reader

Throws:

IOException

SAXException

org.apache.cocoon.ProcessingException

getMimeType

public String getMimeType()

Returns the mime-type of the bitstream.

Specified by:

getMimeType in interface org.apache.cocoon.sitemap.SitemapOutputComponent

Overrides:

getMimeType in class org.apache.cocoon.reading.AbstractReader

recycle

public void recycle()

Recycle

Specified by:

recycle in interface org.apache.avalon.excalibur.pool.Recyclable

Overrides:

recycle in class org.apache.cocoon.reading.AbstractReader