code: void readControlFile(String fileName) throws IOException {
  		BufferedReader reader = new BufferedReader(new FileReader(fileName));
  		try {
  			controlList.clear();
  
  			String line;
  			while ((line = reader.readLine()) != null) {
  				line = line.trim();
  
  				if (line.isEmpty() || line.startsWith("#")) {
  					continue;
  				}
  
  				int separatorIndex = line.indexOf('=');
  
  				if (separatorIndex <= 0) {
  					logger.warn("Control file line \"" + line + "\" is invalid as does not have '=' separator.");
  					continue;
  				}
  
  				String className = line.substring(0, separatorIndex);
  				ControlMode controlMode;
  				try {
  					controlMode = ControlMode.valueOf(line.substring(separatorIndex + 1).trim().toUpperCase());
  				}
  				catch (IllegalArgumentException e) {
  					logger.warn("Control file line \"" + line + "\" is invalid as control mode is unknown.");
  					continue;
  				}
  
  				controlList.add(new ControlEntry(
  				            className.startsWith("/") && className.endsWith("/") && className.length() > 2
  				                        ? Pattern.compile(className.substring(1, className.length() - 1))
  				                        : Pattern.compile(className, Pattern.LITERAL),
  				            controlMode));
  			}
  			configurationValues.put(ConfigurationOption.CONTROL, fileName);
  		}
  		finally {
  			reader.close();
  		}
  	}
docs: Parse the given control file and initialize this config appropriately.