rabbit.handler
Class ImageHandler

java.lang.Object
  rabbit.handler.BaseHandler
      rabbit.handler.ImageHandler

All Implemented Interfaces:

Handler

public class ImageHandler

extends BaseHandler

This class filters images to low quality jpegs.

Field Summary

Fields inherited from class rabbit.handler.BaseHandler

cacheStream, clientstream, con, contentstream, entry, maycache, mayfilter, request, response, size

Constructor Summary

ImageHandler(Connection con, HTTPHeader request, HTTPHeader response, java.io.InputStream contentstream, MultiOutputStream clientstream, boolean maycache, boolean mayfilter, long size)
Create a new ImageHansler for the given request.

Method Summary

void	addCacheStream() Set up the cache stream if available.
protected void	convertImage() Convert the image into a low quality jpeg.
protected void	finish() clear up the mess we made (remove intermediate files etc).
protected void	readImage() Read in the image
protected void	removeCache(java.lang.Exception e) Remove the cachestream and the cache entry.
static void	setup(java.util.Properties prop) Setup this class.
protected void	tryconvert() Try to convert the image.
protected void	writeHeader() Write the response header

Methods inherited from class rabbit.handler.BaseHandler

finishStream, handle, prepareStream, send, setPartialContent

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageHandler

public ImageHandler(Connection con,
                    HTTPHeader request,
                    HTTPHeader response,
                    java.io.InputStream contentstream,
                    MultiOutputStream clientstream,
                    boolean maycache,
                    boolean mayfilter,
                    long size)

Create a new ImageHansler for the given request.

Parameters:

con - the Connection handling the request.

request - the actual request made.

response - the actual response.

contentstream - the stream to read data from.

clientstream - the stream to write data to.

maycache - May we cache this request?

mayfilter - May we filter this request?

size - the size of the data beeing handled.

Method Detail

readImage

protected void readImage()
                  throws java.io.IOException

Read in the image

Throws:

java.io.IOException - if reading of the image fails.

convertImage

protected void convertImage()
                     throws java.io.IOException

Convert the image into a low quality jpeg.

Throws:

java.io.IOException - if conversion fails.

tryconvert

protected void tryconvert()
                   throws java.io.IOException

Try to convert the image. This is done like this: super.addCacheStream (); readImage(); convertImage(); clientstream.removeOutputStream (cacheStream); We have to use the cachefile to convert the image, and if we convert it we dont want to write the file to the cache later on.

Throws:

java.io.IOException

writeHeader

protected void writeHeader()
                    throws java.io.IOException

Write the response header

Overrides:

writeHeader in class BaseHandler

Throws:

java.io.IOException - if writing the response fails.

addCacheStream

public void addCacheStream()
                    throws java.io.IOException

Set up the cache stream if available.

Overrides:

addCacheStream in class BaseHandler

Throws:

java.io.IOException - if a cachestream couldnt be set up.

finish

protected void finish()
               throws java.io.IOException

clear up the mess we made (remove intermediate files etc).

Overrides:

finish in class BaseHandler

Throws:

java.io.IOException - if cleaning fails.

removeCache

protected void removeCache(java.lang.Exception e)

Remove the cachestream and the cache entry.

Overrides:

removeCache in class BaseHandler

Parameters:

e - the Exception that happened

setup

public static void setup(java.util.Properties prop)

Setup this class.

Parameters:

prop - the properties of this class.