Generically get the value from a JSON object using JsonObject

[mathias]

I have a generic JSON Object with the key "data". The value for that key can be any vaild JSON value (array, object, string, number..). Example:

{data:["One","Two","Three"]}

Now I need the value of "data" as a string and this must be generic because the value can be of any type. So far I tried this way:

JsonObject jsonObj = (JsonObject) message.body();
String data = jsonObj.getString("data");

But the problem is, that the method getString("data") results in an exception

java.lang.ClassCastException: io.vertx.core.json.JsonArray cannot be cast to java.lang.CharSequence
    at io.vertx.core.json.JsonObject.getString(JsonObject.java:82)

Any ideas?
 

[Jazz]

check this post by me:

https://groups.google.com/forum/#!topic/vertx/GSCozIMmp1c

[mathias]

Your post describes how to generically fill a JsonArray but not how to read it generically. In the meanwhile I discovered tthe following method:

 public Object getValue(String key) {
    Objects.requireNonNull(key);
    Object val = map.get(key);
    if (val instanceof Map) {
      val = new JsonObject((Map)val);
    } else if (val instanceof List) {
      val = new JsonArray((List)val);
    }
    return val;
  }

So JsonObject provides a generic getter already. I just didn't see it in the late evening :-)

Thx!