JsonAdapterAnnotationTypeAdapterFactory.java 文件源码

static TypeAdapter<?> getTypeAdapter(ConstructorConstructor constructorConstructor, Gson
        gson, TypeToken<?> fieldType, JsonAdapter annotation) {
    Class<?> value = annotation.value();
    if (TypeAdapter.class.isAssignableFrom(value)) {
        return (TypeAdapter) constructorConstructor.get(TypeToken.get((Class) value))
                .construct();
    }
    if (TypeAdapterFactory.class.isAssignableFrom(value)) {
        return ((TypeAdapterFactory) constructorConstructor.get(TypeToken.get((Class) value))
                .construct()).create(gson, fieldType);
    }
    throw new IllegalArgumentException("@JsonAdapter value must be TypeAdapter or " +
            "TypeAdapterFactory reference.");
}