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 and Description
Kit()

Method Summary

Modifier and Type	Method and 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

equals, 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