检查 protobuf 消息 - 如何按名称获取字段值? [英] Examining a protobuf message - how to get field values by name?

问题描述

如果不显式调用 getter，我似乎无法找到一种方法来验证 protobuf 消息中字段的值.

I seem unable to find a way to verify the value of a field inside a protobuf message without explicitly invoking its getter.

我看到了一些使用 Descriptors.FieldDescriptor 实例到达消息映射内部的例子，但它们要么基于迭代器，要么由字段编号驱动.

I see examples around that make usage of Descriptors.FieldDescriptor instances to reach inside the message map, but they are either iterator-based or driven by field number.

一旦我有了地图:

Map<Descriptors.FieldDescriptor, Object> allFields = myMsg.getAllFields();

如何获取"fieldXyz"字段的值?

我知道我可以使用 myMsg.getFieldXyz()，但这不能以系统的方式使用.

I know that I can use myMsg.getFieldXyz(), but this is not usable in a systematic way.

如果无法通过名称访问字段值，我想知道这种选择背后的基本原理是什么.我可能仍然需要了解 protobuf 的哲学":-)

If there is no way to access field values by their names, I'd like to know what is the rationale behind this choice. I may have still to understand the protobuf "philosophy" :-)

推荐答案

我不确定您是否在寻找 Descriptors#findFieldByName(name).您可以尝试以下操作:

I am not sure you are looking for Descriptors#findFieldByName(name). You can try with followings:

FieldDescriptor fieldDescriptor = message.getDescriptorForType().findFieldByName("fieldXyz");
Object value = message.getField(fieldDescriptor);

这篇关于检查 protobuf 消息 - 如何按名称获取字段值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！