AutoValue: Moshi Extension


Source link: https://github.com/rharter/auto-value-moshi

AutoValue: Moshi Extension

An extension for Google's AutoValue that creates a simple Moshi JsonAdapterFactory for each AutoValue annotated object.

Usage

Simply include auto-value-moshi in your project and add a public static method with the following signature to classes you want to get Moshi JsonAdapters. You can also annotate your properties using @Json to define an alternate name for de/serialization.

@AutoValue public abstract class Foo {

abstract String bar();

@Json(name="Baz") abstract String baz();

 public static JsonAdapter<Foo> jsonAdapter(Moshi moshi) {

  return new AutoValue_Foo.MoshiJsonAdapter(moshi);

}
 
}

Now build your project and de/serialize your Foo.

Generics support

If the annotated class uses generics, the static method needs a little modification. Simply add a Type[] parameter and pass it to the generated MoshiJsonAdapter class.

@AutoValue public abstract class Foo<T> {

  abstract T data();

 public static JsonAdapter<Foo<T>> jsonAdapter(Moshi moshi, Type[] types) {

return new AutoValue_Foo.MoshiJsonAdapter(moshi, types);

  
}
 
}

Factory

Optionally, auto-value-moshi can create a single JsonAdapter.Factory so that you don't have to add each generated JsonAdapter to your Moshi instance manually.

To generate a JsonAdapter.Factory for all of your auto-value-moshi classes, simply create an abstract class that implements JsonAdapter.Factory and annotate it with @MoshiAdapterFactory, and auto-value-moshi will create an implementation for you. You simply need to provide a static factory method, just like your AutoValue classes, and you can use the generated JsonAdapter.Factory to help Moshi de/serialize your types.

@MoshiAdapterFactory public abstract class MyAdapterFactory implements JsonAdapter.Factory {

 // Static factory method to access the package
// private generated implementation
public static JsonAdapter.Factory create() {

  return new AutoValueMoshi_MyAdapterFactory();

}

 
}

Then you simply need to register the Factory with Moshi.

Moshi moshi = new Moshi.Builder()
  .add(MyAdapterFactory.create())
  .build();

Download

Add a Gradle dependency:

annotationProcessor 'com.ryanharter.auto.value:auto-value-moshi:0.4.4'  // if you use the @MoshiAdapterFactory annotation, you'll need to add the 'annotations' artifact  // as a provided dependency: provided 'com.ryanharter.auto.value:auto-value-moshi-annotations:0.4.4'

License

Copyright 2015 Ryan Harter.  Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 

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