*/
protected void addPreHook ( Object preHook ) throws Exception {
Interceptor interceptor = (Interceptor) APILocator.getContentletAPIntercepter();
//First we need to be sure we are not adding the same hook more than once
interceptor.delPreHookByClassName( preHook.getClass().getName() );
if ( preHooks == null ) {
preHooks = new ArrayList<String>();
}