ObjectMapper readValue

Question

I load a ressource file json with the text format

{
    \"sources\": [{
            \"prop1\": \"1\",
            \"prop2\": \"2\"

        },
        {
                 


        

Answer 1

In your case, I would write a custom JsonDeserializer. Haven't really tested the code, but I think the idea is clear:

    final MyClassDeserializer myClassDeserializer = new MyClassDeserializer();
    final SimpleModule deserializerModule = new SimpleModule();
    deserializerModule.addDeserializer(MyClass.class, myClassDeserializer);

    final ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(deserializerModule);

And the code for JsonDeserializer:

    public class MyClassDeserializer extends JsonDeserializer {

    @Override
    public MyClass deserialize(final JsonParser jsonParser, final DeserializationContext context)
            throws IOException {
        final JsonNode node = jsonParser.getCodec().readTree(jsonParser);
        final JsonNode sourcesNode = node.get("sources");
        if(node.isArray()) {
            final ArrayNode arrayNode = (ArrayNode) node;
            final Iterable nodes = arrayNode::elements;
            final Set set = StreamSupport.stream(nodes.spliterator(), false)
                    .map(mapper)
                    .collect(Collectors.toSet());
            ...
        }

        ...
    }