Class GsonDecoder

gson/src/main/java/feign/gson/GsonDecoder.java:33–70

import java.util.Collections;

public class GsonDecoder implements Decoder, JsonDecoder {

  private final Gson gson;

  public GsonDecoder(Iterable<TypeAdapter<?>> adapters) {
    this(GsonFactory.create(adapters));
  }

  public GsonDecoder() {
    this(Collections.<TypeAdapter<?>>emptyList());
  }

  public GsonDecoder(Gson gson) {
    this.gson = gson;
  }

  @Override
  public Object decode(Response response, Type type) throws IOException {
    if (response.status() == 404 || response.status() == 204) return Util.emptyValueOf(type);
    if (response.body() == null) return null;
    Reader reader = response.body().asReader(UTF_8);
    try {
      return gson.fromJson(reader, type);
    } catch (JsonIOException e) {
      if (e.getCause() != null && e.getCause() instanceof IOException) {
        throw IOException.class.cast(e.getCause());
      }
      throw e;
    } finally {
      ensureClosed(reader);
    }
  }

  @Override
  public Object convert(Object object, Type type) {
    return gson.fromJson(gson.toJsonTree(object), type);
  }
}