/**
* @param <T> the return type
* @param retvalClass the returned value's {@link Class}
* @param jndi the JNDI path to the resource
* @return the resource at the specified {@code jndi} path
*/
private static <T> T lookup(Class<T> retvalClass, String jndi) {
try {
return retvalClass.cast(InitialContext.doLookup(jndi));
} catch (NamingException ex) {
throw new IllegalArgumentException(
"failed to lookup instance of " + retvalClass + " at " + jndi, ex);
}
}
@Nullable
public static <T> T cast(@NotNull Class<T> type, UnnamedConfigurable configurable) {
if (configurable instanceof ConfigurableWrapper) {
ConfigurableWrapper wrapper = (ConfigurableWrapper) configurable;
if (wrapper.myConfigurable == null) {
Class<?> configurableType = wrapper.getExtensionPoint().getConfigurableType();
if (configurableType != null) {
if (!type.isAssignableFrom(configurableType)) {
return null; // do not create configurable that cannot be cast to the specified type
}
} else if (type == Configurable.Assistant.class || type == OptionalConfigurable.class) {
return null; // do not create configurable from ConfigurableProvider which replaces
// OptionalConfigurable
}
}
configurable = wrapper.getConfigurable();
}
return type.isInstance(configurable) ? type.cast(configurable) : null;
}