JsonPath Fetch string after filter

Question

I am using Jayway JsonPath 2.2 version in JAVA. I have few questions on the same.

Sample JSON:

{ "l5": [ { "type": "type1", "result": [ "res1" ] }, { "type": "type2", "result": [ "r1" ] } ] }

1. I want to fetch a string after a filter is applied?

   Eg:

   Path used to fetch a string is l5[?(@.type == 'type2')].type Expected result: type2 (string), but getting ["type2"] (array)

   Please correct the path if i am doing anything wrong to fetch it as a string?

2. Unable to index the resultant array after the filter is applied. How can i achieve the same?

   Eg:

   If i use the path l5[?(@.type == 'type2')][0], instead of returning me the first JSONObject it returns []

3. Is it possible to extract substring from a string using jsonPath?

   Something like l5[0].type[0,2] => res

Note: I cannot do any operation in JAVA, as i wanted to keep the library generic?

Answer 1

The return value of jsonPath is always an array, quoted from here.

So, the operation1 you are trying is not possible i.e. String value will never be returned.
Even operation 2 and operation 3 doesn't look feasible with jayway jsonpath.

Good read on jayway Jsonpath.

Only Possible way for operation 1 and 2 looks something like below:-

String jsonpath="l5[?(@.type == 'type2')].type";
        DocumentContext jsonContext = JsonPath.parse(jsonString);
        List<String> typeDataList= jsonContext.read(jsonpath);
        System.out.println(typeDataList.get(0)); //type2