CODEWITHSUNDEEP
javajsonjackson
Gavin
Gavin

Reputation: 2824

Remove object of JSON

How do I remove the object of JSON? I am using Jackson API 2.6.3

Example of my JSON String

{  
   "movieList":[  
      {  
         "movieID":1,
         "title":"TITLE 1",
         "type":"DIGITAL",
         "status":"COMING SOON",
         "synopsis":null,
         "director":null,
         "mRating":"G",
         "casts":null,
         "showTimes":[  
            {  
               "date":"01/12/15",
               "time":"22:00"
            },
            {  
               "date":"01/12/15",
               "time":"23:30"
            }
         ]
      }
   ]
}

I would like to be able to remove the whole showTimes object given its index.

Something like showtimesList.get(index).remove() And if it is the last object in the arrayList, the value should be set to null.

As suggested by one of the answer, I am converting the JAVA Object ShowTime to JSONNode by so

ObjectMapper objectMapper = new ObjectMapper();
JsonNode showTimesNode = objectMapper.convertValue(movieList.get(index).getShowTimes(), JsonNode.class);
Iterator<JsonNode> itr = showTimesNode.iterator();
int counter = 1;
while(itr.hasNext() && counter<=showTimeChoice){
    if(counter==showTimeChoice){
        itr.remove();
        Cineplex.updateDatabase(cineplexList);
        System.out.println("Sucessfully removed!");
        break;
    }
    counter++;
}

But it's throwing the error Exception in thread "main" java.lang.IllegalStateException at java.util.ArrayList$Itr.remove(Unknown Source) when I tries to remove the 2nd element of showTimes on the above given JSON String

Which is 

{  
  "date":"01/12/15",
  "time":"23:30"
}

Upvotes: 3

Views: 17365

Answers (3)

Sudheer
Sudheer

Reputation: 131

Something like this should work

public void removeShowTime(int pos){
    final JsonNode movieList = new ObjectMapper().readTree(json).get("movieList").get(0);
    final JsonNode showList = movieList.get("showtimesList");
    Iterator<JsonNode> itr = showList.iterator();
    int counter = 0
    while(itr.hasNext() && counter<=pos){
       if(counter==pos){
           itr.remove();
       }
       counter++;
    }
}

Upvotes: 1

Amadan
Amadan

Reputation: 198324

Something like this should work (I'm not a Jackson user, so YMMV):

((ObjectNode) movieListElement).remove("showTimes");

EDIT:

JsonNode movieListElement = ((ArrayNode) root.path("movieList").get(index);

Upvotes: 2

sunysen
sunysen

Reputation: 2351

for (JsonNode personNode : rootNode) {
    if (personNode instanceof ObjectNode) {
       if (personNode.has("showTimes")) {
          ObjectNode object = (ObjectNode) personNode;  
          object.remove("showTimes");
       }
    }
}

Upvotes: 4

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