使用 Gson 解析嵌套的动态模块

Question

我有一个或多或少像这样的 JSON：

{
  "modules": {
    "someExistingModule": {
      "name": "pug",
      ...
    },

    "randomExistingModule": {
      "type": "cat",
      ...
    },

    "myNewModule": {   // <----- I care about this module. Note that this is NOT an array
      "modules": {
        "img1": {
          "type": "image",
          "url": "https://some/random/image,
          "altText": "Some image description
        },
        "img2": {
          "type": "image",
          "url": "https://some/random/image,
          "altText": "Some image description
        },
        "img3": {
          "type": "image",
          "url": "https://some/random/image,
          "altText": "Some image description
        },
        "txt1": {           // <------ Updated JSON
          "type": "text",
          "content": "Hello world 1"
        },
        "txt2": {
          "type": "text",
          "content": "Hello world 2"
        },
        ...
      }
    }

在myModule 内部可以有N 个imgN 对象和txtN。我需要动态解析它。

我当前的 Response 类如下所示：

public class MyModuleResponse extends SomeResponseClass
{
  @Override
    public void parse(InputStream data)
    {
        T responseBody = readJsonStream(data, MyModuleResponseBody.class());
        MyModuleDataParser.parse(responseBody);
    }

MyModuleDataParser.java

...
public static MyModuleDataParser parse(@Nullable MyModuleResponseBody body)
{
  parseSomeExistingModule();

  parseRandomExistingModule();

  parseMyNewModule(); // <--- This is the new module I'm trying to parse. Currently, this method is empty.

}

MyModuleResponseBody.java

public class MyModuleResponseBody
{
  public Modules modules;

  public static class Modules
  {
    SomeExistingModule someExistingModule;
    RandomExistingModule randomExistingModule;
    MyNewModule myNewModule; // <----- My new module
  }

  public static class SomeExistingModule
  {
    String name;
    ...
  }

  public static class RandomExistingModule
  {
    String type;
    ...
  }

  public static class MyNewModule
    {
        public ??? modules;   // <--- Trying to define the Type here. Something like List<MyImageModule>. But, it won't work
    }

MyImageModule.java

public class MyImageModule extends Module // <---- Update: This class now extends a generic Module class
{
  private String url;
  private String altText;
}

MyTextModule.java

public class MyTextModule extends Module    // New class
{
  private String content;
}

Module.java

public class Module  // <----- New parent class
{
  protected String type;
}

如何从myNewModule 创建MyImageModule 列表？我相信我需要使用来自 Gson 库的某种 TypeAdapter。但是，我不熟悉如何在现有响应中执行此操作。

Answer 1

使用Map<String, MyImageModule>，其实就是一个hashmap来解决json中non-list modules对象的问题。

public static class MyNewModule {
    public Map<String, MyImageModule> modules; // initialize as a hashmap
}