Class JunkBusterHandler

  • All Implemented Interfaces:
    Handler

    public class JunkBusterHandler
    extends java.lang.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.

    Properties:

    image
    The file to contain the replacement image.
    host
    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.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean init​(Server server, java.lang.String prefix)
      Initializes the handler.
      Regexp loadUrls​(java.util.Properties props, java.lang.String prefix, java.lang.String file)  
      boolean respond​(Request request)
      Responds to an HTTP request.
      boolean sendReplacementImage​(Request request)  
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • JunkBusterHandler

        public JunkBusterHandler()
    • Method Detail

      • init

        public boolean init​(Server server,
                            java.lang.String prefix)
        Description copied from interface: Handler
        Initializes the handler.
        Specified by:
        init in interface Handler
        Parameters:
        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.
        Returns:
        true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.
      • respond

        public boolean respond​(Request request)
                        throws java.io.IOException
        Description copied from interface: Handler
        Responds to an HTTP request.
        Specified by:
        respond in interface Handler
        Parameters:
        request - The Request object that represents the HTTP request.
        Returns:
        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.
        Throws:
        java.io.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.

      • loadUrls

        public Regexp loadUrls​(java.util.Properties props,
                               java.lang.String prefix,
                               java.lang.String file)
      • sendReplacementImage

        public boolean sendReplacementImage​(Request request)
                                     throws java.io.IOException
        Throws:
        java.io.IOException