JsonNode as output type of DocumentContext.read()

[chefho...@gmail.com]

I'm new to this JsonPath library, and can't really tell from the documentation how to work with the results of read operations.

I don't need to convert results into pojos, but I would like to work with the results as jackson JsonNodes, for example.

Given something like this:

{

   "bradies": [

      { "name": "bobby", "gender": "male" }

      { "name": "greg", "gender": "male" }

      { "name": "cindy", "gender": "female" }

      { "name": "marsha", "gender": "female" }

   ]

}

...I'd like to be able to do something like this:

Filter girlsOnly = filter( where("gender").is("female") );

List<JsonNode> bradyGirls = parseResults.read( "$.bradies", girlsOnly );

...but, accessing elements of the list above yields a ClassCastException.

Is it possible to get results from read() returned as jackson objects?

[kalle stenflo]

Yes it's possible. Try something like this.

 

@Test
public void using_jackson_json_node_provider() {


    //Configure this when your application bootstraps
    Configuration.setDefaults(new Configuration.Defaults() {
        @Override
        public JsonProvider jsonProvider() {
            return new JacksonJsonNodeJsonProvider();
        }


        @Override
        public Set<Option> options() {
            return EnumSet.noneOf(Option.class);
        }


        @Override
        public MappingProvider mappingProvider() {
            return new JacksonMappingProvider();
        }
    });


    String json = "{\n" +
            "   \"bradies\": [\n" +
            "      { \"name\": \"bobby\", \"gender\": \"male\" },\n" +
            "      { \"name\": \"greg\", \"gender\": \"male\" },\n" +
            "      { \"name\": \"cindy\", \"gender\": \"female\" },\n" +
            "      { \"name\": \"marsha\", \"gender\": \"female\" }\n" +
            "   ]\n" +
            "}";


    Filter girlsOnly = Filter.filter(Criteria.where("gender").is("female"));
    com.fasterxml.jackson.databind.node.ArrayNode result1 = JsonPath.parse(json).read("$.bradies[?]", girlsOnly);


    //this is equivalent (using inline filter)
    com.fasterxml.jackson.databind.JsonNode result2 = JsonPath.parse(json).read("$.bradies[?(@.gender == 'female')]");


    System.out.println(result1);
    System.out.println(result2);
}