Very strange behaviour of RGBImageFilter class

Question

Hi!
I found very strange behaviour of RGBImageFilter class and problem is
that I need to solve that problem :/ So, situation is next:
I decided to use filtering process for collecting information about
image. So, I extended my own class from RGBImageFilter and overwrite
filterRGB( ... ) method ( everything is absolutely the same as in
documentation ) and also added my own code for 'no matter what'.
This code changes some class variable and my idea was to read those
variables after filtering process end, but... Suddenly I realized that
those variables, many times changed while filtering were performed
( I checked it ) after filtering gave the same value as in constructor!
The only one clue and idea about what happened is that class instance
were cloned and then executed, but thats not a functionality I was
searching. :/ I made some example of that 'effect'.
Image file name goes in command line.
Please pay attention on -3 value on exit: Filtering works, count growing
( just uncomment setPixels() method to see it ) but, but...
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
class ToForum
     public static void main( String[] args )
          try
               JFrame frame = new JFrame( "now i beleave in x-files!" );
               frame.setDefaultCloseOperation( frame.DISPOSE_ON_CLOSE );
               Toolkit kit = Toolkit.getDefaultToolkit();
               Image origin = kit.getImage( args[0] );
               RedBlueSwapFilter filter = new RedBlueSwapFilter();
               Image filtered = frame.createImage( new FilteredImageSource( origin.getSource(), filter ) );
               MediaTracker tracker = new MediaTracker( frame );
               tracker.addImage( filtered, 1 );
               tracker.waitForAll();
               System.out.println( "AND WE GOT: "+filter.getCount()+" !!!" );
               Container content = frame.getContentPane();
               content.setLayout( new FlowLayout() );
               JLabel label = new JLabel( new ImageIcon( filtered ) );
               content.add( label );
               frame.pack();
               frame.setVisible( true );
          catch( Exception ex )
               System.out.println( "Exception in main():\n"+ex );
class RedBlueSwapFilter extends RGBImageFilter
     private int count=-5;
     public RedBlueSwapFilter()
          count = -3;
          canFilterIndexColorModel = true;
     // uncommenting this function will show that filterRGB method IS calling !!!
     // so, why then AFTER filtering count is still ( or again ??? ) equals to 0 ?
     public void setPixels( int x, int y, int w, int h, ColorModel model, int pixels[], int off, int scansize )
          System.out.println( "on entering in setPixels count="+count );
          super.setPixels( x, y, w, h, model, pixels, off, scansize );
          System.out.println( "on exiting from setPixels count="+count );
     public int filterRGB( int x, int y, int rgb )
          count++;
          return ( (rgb&0xff00ff00) | ((rgb&0xff0000) >> 16) | ((rgb&0xff) << 16) );
     public int getCount()
          return count;

Answer 1

Cliff, Hi. I'm curious because this can't work. I have no problem synching with the exchange - as long as i accept the message that the certificate of the exchange (which is not the certificate of the exchange but the certificate of dig @reighthandsideofmailadress) is not valid (expired, wrong common name etc).