code: @Override
  	public boolean accept(final File file) {
  		if (file != null) {
  			if (file.isDirectory()) {
  				return true;
  			}
  
  			final String extension = getExtension(file);
  			if (extension != null && filters.containsKey(extension)) {
  				return true;
  			}
  		}
  		return false;
  	}
docs: Return true if this file should be shown in the directory pane, false if it shouldn't.
  
  Files that begin with "." are ignored.
  
  @return boolean
  @param file
  File
  @see #getExtension
  @see javax.swing.filechooser.FileFilter#accept