JsonLdSerializer.java 文件源码

private ListMultimap<String, Thing> readReverse(JsonReader reader) throws IOException {
  reader.beginObject();
  ListMultimap<String, Thing> reverseMap = LinkedListMultimap.create();
  while (reader.hasNext()) {
    String property = reader.nextName();
    JsonToken token = reader.peek();
    if (token == JsonToken.BEGIN_OBJECT) {
      reverseMap.put(property, readObject(reader));
    } else if (token == JsonToken.BEGIN_ARRAY) {
      reader.beginArray();
      while (reader.hasNext()) {
        reverseMap.put(property, readObject(reader));
      }
      reader.endArray();
    } else {
      throw new JsonLdSyntaxException(
          String.format(
              "Invalid value token %s in @reverse. Should be a JSON-LD object or an "
                  + "array of JSON-LD objects",
              token));
    }
  }
  reader.endObject();
  return reverseMap;
}