$Gson$Types.java 文件源码

static Type resolveTypeVariable(Type context, Class<?> contextRawType, TypeVariable<?> unknown) {
  Class<?> declaredByRaw = declaringClassOf(unknown);

  // we can't reduce this further
  if (declaredByRaw == null) {
    return unknown;
  }

  Type declaredBy = getGenericSupertype(context, contextRawType, declaredByRaw);
  if (declaredBy instanceof ParameterizedType) {
    int index = indexOf(declaredByRaw.getTypeParameters(), unknown);
    return ((ParameterizedType) declaredBy).getActualTypeArguments()[index];
  }

  return unknown;
}