OptionalParamProvider.java 文件源码

@Override
public <T> ParamConverter<T> getConverter(Class<T> aClass, Type type, Annotation[] annotations) {
    if (aClass == Optional.class) {
        try {
            return (ParamConverter<T>) new OptionalParamConverter(type);
        } catch (NoSuchMethodException | IllegalArgumentException e) {
            return null;
        }
    }

    return null;
}