/** Invoke a method on an object using reflection. */
public static Object invoke(final Object target, final Method method, final Object... args) {
try {
return AccessController.doPrivileged(
new PrivilegedExceptionAction<Object>() {
public Object run() throws IllegalAccessException, InvocationTargetException {
if (!method.isAccessible())
method.setAccessible(
true); // Say please - else invoke() will fail if method is protected
return method.invoke(target, args);
}
});
} catch (PrivilegedActionException e) {
e.printStackTrace();
}
return null;
}
/*
* Does the real work of creating an AppletAudioClip from an InputStream.
* This function is used by both constructors.
*/
void createAppletAudioClip(InputStream in) throws IOException {
// If we haven't initialized yet, we need to find the AudioClip constructor using reflection.
// We'll use com.sun.media.sound.JavaSoundAudioClip to implement AudioClip if the Java Sound
// extension is installed. Otherwise, we use sun.audio.SunAudioClip.
if (acConstructor == null) {
if (DEBUG) System.out.println("Initializing AudioClip constructor.");
try {
acConstructor =
(Constructor)
AccessController.doPrivileged(
new PrivilegedExceptionAction() {
public Object run()
throws NoSuchMethodException, SecurityException, ClassNotFoundException {
Class acClass = null;
try {
// attempt to load the Java Sound extension class JavaSoundAudioClip
acClass =
Class.forName(
"com.sun.media.sound.JavaSoundAudioClip",
true,
ClassLoader
.getSystemClassLoader()); // may throw ClassNotFoundException
if (DEBUG) System.out.println("Loaded JavaSoundAudioClip");
} catch (ClassNotFoundException e) {
acClass =
Class.forName(
"sun.audio.SunAudioClip",
true,
null); // may throw ClassNotFoundException
if (DEBUG) System.out.println("Loaded SunAudioClip");
}
Class[] parms = new Class[1];
parms[0] =
Class.forName(
"java.io.InputStream"); // may throw ClassNotFoundException
return acClass.getConstructor(
parms); // may throw NoSuchMethodException or SecurityException
}
});
} catch (PrivilegedActionException e) {
if (DEBUG) System.out.println("Got a PrivilegedActionException: " + e.getException());
// e.getException() may be a NoSuchMethodException, SecurityException, or
// ClassNotFoundException.
// however, we throw an IOException to avoid changing the interfaces....
throw new IOException("Failed to get AudioClip constructor: " + e.getException());
}
} // if not initialized
// Now instantiate the AudioClip object using the constructor we discovered above.
try {
Object[] args = new Object[] {in};
audioClip = (AudioClip) acConstructor.newInstance(args); // may throw InstantiationException,
// IllegalAccessException,
// IllegalArgumentException,
// InvocationTargetException
} catch (Exception e3) {
// no matter what happened, we throw an IOException to avoid changing the interfaces....
throw new IOException("Failed to construct the AudioClip: " + e3);
}
}
