private Object replace(Class<?> type, ApplicableGenerator generator, boolean alternative) { for (Creator<?> creator : creators) { ParameterizedType generic = (ParameterizedType) creator.getClass().getGenericInterfaces()[0]; Class<?> restrained = generic.getActualTypeArguments()[0] instanceof ParameterizedType ? (Class<?>) ((ParameterizedType) generic.getActualTypeArguments()[0]).getRawType() : (Class<?>) generic.getActualTypeArguments()[0]; if (type.isAssignableFrom(restrained)) { return creator.create(); } } return generator.generate(type, alternative); }