Package org.mozilla.javascript

## Class Kit

- java.lang.Object
- - org.mozilla.javascript.Kit

-     public class Kit
      extends java.lang.Object

  Collection of utilities

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `Kit()` |

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `static java.lang.Object` | `addListener​(java.lang.Object bag, java.lang.Object listener)` | Add listener to bag of listeners.
    `static java.lang.Class<?>` | `classOrNull​(java.lang.ClassLoader loader, java.lang.String className)` | Attempt to load the class of the given name.
    `static java.lang.Class<?>` | `classOrNull​(java.lang.String className)` |
    `static java.lang.RuntimeException` | `codeBug()` | Throws RuntimeException to indicate failed assertion.
    `static java.lang.RuntimeException` | `codeBug​(java.lang.String msg)` | Throws RuntimeException to indicate failed assertion.
    `static java.lang.Object` | `getListener​(java.lang.Object bag, int index)` | Get listener at index position in bag or null if index equals to number of listeners in bag.
    `static java.lang.RuntimeException` | `initCause​(java.lang.RuntimeException ex, java.lang.Throwable cause)` | If initCause methods exists in Throwable, call `ex.initCause(cause)` or otherwise do nothing.
    `static java.lang.Object` | `makeHashKeyFromPair​(java.lang.Object key1, java.lang.Object key2)` |
    `static java.lang.String` | `readReader​(java.io.Reader r)` |
    `static byte[]` | `readStream​(java.io.InputStream is, int initialBufferCapacity)` |
    `static java.lang.Object` | `removeListener​(java.lang.Object bag, java.lang.Object listener)` | Remove listener from bag of listeners.
    `static int` | `xDigitToInt​(int c, int accumulator)` | If character `c` is a hexadecimal digit, return `accumulator` * 16 plus corresponding number.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Kit

          public Kit()

  - ### Method Detail

    - #### classOrNull

          public static java.lang.Class<?> classOrNull​(java.lang.String className)

    - #### classOrNull

          public static java.lang.Class<?> classOrNull​(java.lang.ClassLoader loader,
                                                       java.lang.String className)

      Attempt to load the class of the given name. Note that the type parameter isn't checked.

    - #### initCause

          public static java.lang.RuntimeException initCause​(java.lang.RuntimeException ex,
                                                             java.lang.Throwable cause)

      If initCause methods exists in Throwable, call `ex.initCause(cause)` or otherwise do nothing.
      Returns:
        The `ex` argument.

    - #### xDigitToInt

          public static int xDigitToInt​(int c,
                                        int accumulator)

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

    - #### addListener

          public static java.lang.Object addListener​(java.lang.Object bag,
                                                     java.lang.Object listener)

      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:
        `removeListener(Object bag, Object listener)`, `getListener(Object bag, int index)`

    - #### removeListener

          public static java.lang.Object removeListener​(java.lang.Object bag,
                                                        java.lang.Object listener)

      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:
        `addListener(Object bag, Object listener)`, `getListener(Object bag, int index)`

    - #### getListener

          public static java.lang.Object getListener​(java.lang.Object bag,
                                                     int index)

      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:
        `addListener(Object bag, Object listener)`, `removeListener(Object bag, Object listener)`

    - #### makeHashKeyFromPair

          public static java.lang.Object makeHashKeyFromPair​(java.lang.Object key1,
                                                             java.lang.Object key2)

    - #### readReader

          public static java.lang.String readReader​(java.io.Reader r)
                                             throws java.io.IOException

      Throws:
        `java.io.IOException`

    - #### readStream

          public static byte[] readStream​(java.io.InputStream is,
                                          int initialBufferCapacity)
                                   throws java.io.IOException

      Throws:
        `java.io.IOException`

    - #### codeBug

          public static java.lang.RuntimeException codeBug()
                                                    throws java.lang.RuntimeException

      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.
      Throws:
        `java.lang.RuntimeException`

    - #### codeBug

          public static java.lang.RuntimeException codeBug​(java.lang.String msg)
                                                    throws java.lang.RuntimeException

      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.
      Throws:
        `java.lang.RuntimeException`