Class JunkBusterHandler

  extended by sunlabs.brazil.proxy.JunkBusterHandler (view source)
All Implemented Interfaces:

public class JunkBusterHandler
extends Object
implements Handler

Remove junk images from web pages. This approach is to take all requests for images that look like ads and instead return a dummy bitmap.

Other approaches to removing ads are to filter the HTML returned and (1) remove the ads altogether or (2) change the href in the ads to point to a different bitmap. The advantage of option (2) is that all ads can be changed to point to the same bitmap, increasing the caching performance of the browser.


The file to contain the replacement image.
The regular expression matching url's to reject. If the expression starts with a '@', it interpreted as a file name (minus the @) that contains a new-line separated list of regular exporessions. See Regexp for more information on regular expressions.

Constructor Summary
Method Summary
 boolean init(Server server, String prefix)
          Initializes the handler.
 Regexp loadUrls(Properties props, String prefix, String file)
 boolean respond(Request request)
          Responds to an HTTP request.
 boolean sendReplacementImage(Request request)
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public JunkBusterHandler()
Method Detail


public boolean init(Server server,
                    String prefix)
Description copied from interface: Handler
Initializes the handler.

Specified by:
init in interface Handler
server - The HTTP server that created this Handler. Typical Handlers will use Server.props to obtain run-time configuration information.
prefix - The handlers name. The string this Handler may prepend to all of the keys that it uses to extract configuration information from Server.props. This is set (by the Server and ChainHandler) to help avoid configuration parameter namespace collisions.
true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.


public boolean respond(Request request)
                throws IOException
Description copied from interface: Handler
Responds to an HTTP request.

Specified by:
respond in interface Handler
request - The Request object that represents the HTTP request.
true if the request was handled. A request was handled if a response was supplied to the client, typically by calling Request.sendResponse() or Request.sendError.
IOException - if there was an I/O error while sending the response to the client. Typically, in that case, the Server will (try to) send an error message to the client and then close the client's connection.

The IOException should not be used to silently ignore problems such as being unable to access some server-side resource (for example getting a FileNotFoundException due to not being able to open a file). In that case, the Handler's duty is to turn that IOException into a HTTP response indicating, in this case, that a file could not be found.


public Regexp loadUrls(Properties props,
                       String prefix,
                       String file)


public boolean sendReplacementImage(Request request)
                             throws IOException

Version Kenai-svn-r24, Generated 08/18/09
Copyright (c) 2001-2009, Sun Microsystems.