Class MoshiDecoder

moshi/src/main/java/feign/moshi/MoshiDecoder.java:30–70

import okio.Okio;

public class MoshiDecoder implements Decoder, JsonDecoder {
  private final Moshi moshi;

  public MoshiDecoder(Moshi moshi) {
    this.moshi = moshi;
  }

  public MoshiDecoder() {
    this.moshi = new Moshi.Builder().build();
  }

  public MoshiDecoder(Iterable<JsonAdapter<?>> adapters) {
    this(MoshiFactory.create(adapters));
  }

  @Override
  public Object decode(Response response, Type type) throws IOException {
    JsonAdapter<Object> jsonAdapter = moshi.adapter(type);

    if (response.status() == 404 || response.status() == 204) return Util.emptyValueOf(type);
    if (response.body() == null) return null;

    try (BufferedSource source = Okio.buffer(Okio.source(response.body().asInputStream()))) {
      if (source.exhausted()) {
        return null; // empty body
      }
      return jsonAdapter.fromJson(source);
    } catch (JsonDataException e) {
      if (e.getCause() != null && e.getCause() instanceof IOException) {
        throw (IOException) e.getCause();
      }
      throw e;
    }
  }

  @Override
  public Object convert(Object object, Type type) throws IOException {
    JsonAdapter<Object> adapter = moshi.adapter(type);
    return adapter.fromJsonValue(object);
  }
}