rabbit.handler
Class ImageHandler

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

All Implemented Interfaces:

Handler, HandlerFactory, Logger

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

Fields inherited from interface rabbit.util.Logger

ALL, DEBUG, ERROR, FATAL, INFO, MSG, WARN

Constructor Summary

ImageHandler()

ImageHandler(Connection con, HTTPHeader request, HTTPHeader response, HTTPInputStream 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).
Handler	getNewInstance(Connection connection, HTTPHeader header, HTTPHeader webheader, HTTPInputStream contentStream, MultiOutputStream out, boolean maycache, boolean mayfilter, long size) Get a new Handler for the given request made.
protected boolean	mayCacheFromSize() Images needs to be cacheable to be compressed.
protected boolean	mayRestrictCacheSize() Check if this handler may force the cached resource to be less than the cache max size.
protected void	readImage() Read in the image
protected void	removeCache(java.lang.Exception e) Remove the cachestream and the cache entry.
void	setup(Logger logger, SProperties 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

clientStreamHasCache, finishStream, getFactory, handle, logError, logError, prepareStream, send, setPartialContent, writeData

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageHandler

public ImageHandler()

ImageHandler

public ImageHandler(Connection con,
                    HTTPHeader request,
                    HTTPHeader response,
                    HTTPInputStream 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

getNewInstance

public Handler getNewInstance(Connection connection,
                              HTTPHeader header,
                              HTTPHeader webheader,
                              HTTPInputStream contentStream,
                              MultiOutputStream out,
                              boolean maycache,
                              boolean mayfilter,
                              long size)

Description copied from interface: HandlerFactory

Get a new Handler for the given request made.

Specified by:

getNewInstance in interface HandlerFactory

Overrides:

getNewInstance in class BaseHandler

Parameters:

connection - the Connection handling the request.

header - the request.

webheader - the response.

contentStream - the data to read.

out - the client (and possibly the cache).

maycache - if the handler may cache the response.

mayfilter - if the handler may filter the response.

size - the Size of the data beeing handled (-1 = unknown length).

mayCacheFromSize

protected boolean mayCacheFromSize()

Images needs to be cacheable to be compressed.

Overrides:

mayCacheFromSize in class BaseHandler

Returns:

true

mayRestrictCacheSize

protected boolean mayRestrictCacheSize()

Check if this handler may force the cached resource to be less than the cache max size.

Overrides:

mayRestrictCacheSize in class BaseHandler

Returns:

false

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 void setup(Logger logger,
                  SProperties prop)

Setup this class.

Specified by:

setup in interface HandlerFactory

Overrides:

setup in class BaseHandler

Parameters:

prop - the properties of this class.