Class Kit

Add listener to bag of listeners. The function does not modify bag and return a new collection containing listener and all listeners from bag. Bag without listeners always represented as the null value.

Usage example:

     private volatile Object changeListeners;

     public void addMyListener(PropertyChangeListener l)
     {
         synchronized (this) {
             changeListeners = Kit.addListener(changeListeners, l);
         }
     }

     public void removeTextListener(PropertyChangeListener l)
     {
         synchronized (this) {
             changeListeners = Kit.removeListener(changeListeners, l);
         }
     }

     public void fireChangeEvent(Object oldValue, Object newValue)
     {
     // Get immune local copy
         Object listeners = changeListeners;
         if (listeners != null) {
             PropertyChangeEvent e = new PropertyChangeEvent(
                 this, "someProperty" oldValue, newValue);
             for (int i = 0; ; ++i) {
                 Object l = Kit.getListener(listeners, i);
                 if (l == null)
                     break;
                 ((PropertyChangeListener)l).propertyChange(e);
             }
         }
     }
 

Parameters: listener Listener to add to bag bag Current collection of listeners.

Returns: A new bag containing all listeners from bag and listener.

See Also: Kit Kit

Throws RuntimeException to indicate failed assertion. The function never returns and its return type is RuntimeException only to be able to write throw Kit.codeBug() if plain Kit.codeBug() triggers unreachable code error.

Get listener at index position in bag or null if index equals to number of listeners in bag.

For usage example, see addListener(Object bag, Object listener).

Parameters: bag Current collection of listeners. index Index of the listener to access.

Returns: Listener at the given index or null.

See Also: Kit Kit

If initCause methods exists in Throwable, call ex.initCause(cause) or otherwise do nothing.

Returns: The ex argument.

Remove listener from bag of listeners. The function does not modify bag and return a new collection containing all listeners from bag except listener. If bag does not contain listener, the function returns bag.

For usage example, see addListener(Object bag, Object listener).

Parameters: listener Listener to remove from bag bag Current collection of listeners.

Returns: A new bag containing all listeners from bag except listener.

See Also: Kit Kit

Split string into array of strings using semicolon as string terminator (; after the last string is required).

If character c is a hexadecimal digit, return accumulator * 16 plus corresponding number. Otherise return -1.