使用Gson反序列化ImmutableList

问题描述

我使用了很多不可变的集合，我很好奇如何使用Gson反序列化它们。由于没有人回答，我自己找到了解决方案，我正在简化问题并提出自己的答案。

我有两个问题：

• 如何为所有 ImmutableList< XXX>写入一个反序列化程序 ？


• 如何为所有 ImmutableList< XXX> ？
注册

解决方案

更新：，其中涵盖了许多番石榴集合：

• ImmutableList


• ImmutableSet


• ImmutableSortedSet


• ImmutableMap


• ImmutableSortedMap

---

这部分是微不足道的，注册的第一个参数是 java.lang .reflect.Type 误导我使用 ParameterizedType ，其中简单地使用 Class 作业：

$ $ p $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $。$ b .create（）;

I'm using quite a few immutable collections and I'm curious how to deserialize them using Gson. As nobody answered and I've found the solution myself, I'm simplifying the question and presenting my own answer.

I had two problems:

• How to write a single Deserializer working for all ImmutableList<XXX>?
• How to register it for all ImmutableList<XXX>?

解决方案

Update: There's https://github.com/acebaggins/gson-serializers which covers many guava collections:

• ImmutableList
• ImmutableSet
• ImmutableSortedSet
• ImmutableMap
• ImmutableSortedMap

---

The idea is simple, transform the passed Type representing an ImmutableList<T> into a Type representing List<T>, use the build-in Gson's capability to create a List and convert it to an ImmutableList.

class MyJsonDeserializer implements JsonDeserializer<ImmutableList<?>> {
    @Override
    public ImmutableList<?> deserialize(JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException {
        final Type type2 = ParameterizedTypeImpl.make(List.class, ((ParameterizedType) type).getActualTypeArguments(), null);
        final List<?> list = context.deserialize(json, type2);
        return ImmutableList.copyOf(list);
    }
}

There are multiple ParameterizedTypeImpl classes in Java libraries I use, but none of them intended for public usage. I tested it with sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.

That part is trivial, the first argument to register is java.lang.reflect.Type which mislead me to using ParameterizedType, where simply using Class does the job:

final Gson gson = new GsonBuilder()
    .registerTypeAdapter(ImmutableList.class, myJsonDeserializer)
    .create();

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