Question 192343 in Json Question posted in
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Add data at child level in JSON Object

I want to merge JSON Object to master JSON Object at required depth

Master JSON

{
  "data":{
    "barrel":{
      "length":100,
      "stage":[0,1,2]
    },
    "a":100,
    "b":200
  }
}

New JSON Object to be added at path data.barrel

{
 "width":100
}

Required Output

{
  "data":{
    "barrel":{
      "length":100,
      "stage":[0,1,2],
       "width":100
    },
    "a":100,
    "b":200
  }
}

Tried following code

String str = "{"data":{"barrel":{"length":100,"stage":[0,1,2]},"a":100,"b":200}}";
String newstr = "{"width":100}";
String path = "data.barrel";

JSONObject jonew = new JSONObject(newstr);

Josson josson = Josson.fromJsonString(str);
Josson jossonNew = Josson.fromJsonString(jonew.toString());

System.out.println(josson.getNode(path));
JsonNode jn = josson.getNode(path);
JsonNode jnNew = jossonNew.getNode();

Iterator<String> keys = jonew.keys();
while (keys.hasNext()) {
String key = keys.next();
    if (!jn.has(key))
    ((ObjectNode) jn).set(key, jnNew.get(key));
}

Output

{"length":100,"stage":[0,1,2],"width":100}

I am able to add child as a separate object, but not to the parent JSON Object
I need a generic way as the path and depth can be varying

Regards,
Pranav

Tags:

2

Answers


  1. 0 
    public void mergeJSON(JsonObject masterJson, String path, JsonObject newJson) 
{
    String[] keys = path.split("\.");

    JsonObject currentJson = masterJson;
    for (int i = 0; i < keys.length - 1; i++) {
      String key = keys[i];
      if (currentJson.has(key) && currentJson.get(key).isJsonObject()) {
        currentJson = currentJson.getAsJsonObject(key);
      } else {
        JsonObject nestedJson = new JsonObject();
        currentJson.add(key, nestedJson);
        currentJson = nestedJson;
      }
    }

    String lastKey = keys[keys.length - 1];
    currentJson.add(lastKey, newJson);
  }

    and then you can invoke this method

    mergeJSON(masterJson, "data.barrel", newJson);
String updatedJsonString = gson.toJson(masterJson);
System.out.println(updatedJsonString);
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  2. 0

    Deserialization

    Josson master = Josson.fromJsonString(
    "{" +
    "  "data":{" +
    "    "barrel":{" +
    "      "length":100," +
    "      "stage":[0,1,2]" +
    "    }," +
    "    "a":100," +
    "    "b":200" +
    "  }" +
    "}");

    By Parameters

    Map<String, JsonNode> params = new HashMap<>();
params.put("$new", Josson.readJsonNode("{"width":100}"));
JsonNode node = master.getNode(
    "field(data.field(barrel.mergeObjects(?, $new)))", params);
System.out.println(node.toPrettyString());

    By Inline

    String addNew = "{"width":100}"; // any ' needs to double it ''
JsonNode node = master.getNode(
    "field(data.field(barrel.mergeObjects(?, json('" + addNew + "'))))");
System.out.println(node.toPrettyString());

    Output

    {
  "data" : {
    "barrel" : {
      "length" : 100,
      "stage" : [ 0, 1, 2 ],
      "width" : 100
    },
    "a" : 100,
    "b" : 200
  }
}
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