/**
* Implement the decorator pattern for the factory implementation.
*
* <p>
*
* <p>If <code>previousImpl</code> is non-<code>null</code> and the class named by the argument
* <code>implName</code> has a one arg contstructor of type <code>factoryName</code>, instantiate
* it, passing previousImpl to the constructor.
*
* <p>
*
* <p>Otherwise, we just instantiate and return <code>implName</code>.
*
* @param classLoader the ClassLoader from which to load the class
* @param factoryName the fully qualified class name of the factory.
* @param implName the fully qualified class name of a class that implements the factory.
* @param previousImpl if non-<code>null</code>, the factory instance to be passed to the
* constructor of the new factory.
*/
private static Object getImplGivenPreviousImpl(
ClassLoader classLoader, String factoryName, String implName, Object previousImpl) {
Class clazz;
Class factoryClass = null;
Class[] getCtorArg;
Object[] newInstanceArgs = new Object[1];
Constructor ctor;
Object result = null;
InjectionProvider provider = null;
// if we have a previousImpl and the appropriate one arg ctor.
if ((null != previousImpl) && (null != (factoryClass = getFactoryClass(factoryName)))) {
try {
clazz = Class.forName(implName, false, classLoader);
getCtorArg = new Class[1];
getCtorArg[0] = factoryClass;
ctor = clazz.getConstructor(getCtorArg);
newInstanceArgs[0] = previousImpl;
result = ctor.newInstance(newInstanceArgs);
FactoryManager fm = FACTORIES_CACHE.getApplicationFactoryManager(classLoader);
provider = fm.getInjectionProvider();
if (null != provider) {
provider.inject(result);
provider.invokePostConstruct(result);
} else {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(
Level.SEVERE,
"Unable to inject {0} because no InjectionProvider can be found. Does this container implement the Mojarra Injection SPI?",
result);
}
}
} catch (NoSuchMethodException nsme) {
// fall through to "zero-arg-ctor" case
factoryClass = null;
} catch (Exception e) {
throw new FacesException(implName, e);
}
}
if (null == previousImpl || null == factoryClass) {
// we have either no previousImpl or no appropriate one arg
// ctor.
try {
clazz = Class.forName(implName, false, classLoader);
// since this is the hard coded implementation default,
// there is no preceding implementation, so don't bother
// with a non-zero-arg ctor.
result = clazz.newInstance();
} catch (Exception e) {
throw new FacesException(implName, e);
}
}
return result;
}
protected void invokePostConstruct(Object bean, InjectionProvider injectionProvider) {
if (isInjectible) {
try {
injectionProvider.invokePostConstruct(bean);
} catch (InjectionProviderException ipe) {
String message =
MessageUtils.getExceptionMessageString(
MessageUtils.MANAGED_BEAN_INJECTION_ERROR_ID, beanInfo.getName());
throw new ManagedBeanCreationException(message, ipe);
}
}
}
