Jackson: Get entire object in custom field JsonDeserializer

Question

I have this class:

@JsonIgnoreProperties(ignoreUnknown = true)
public class VehicleRestModel implements RestModel<Article> {

    @JsonProperty("idVehicle")
    public String id;

    public String name;
}

And I get this JSON from REST API:

[
  { "idVehicle" : "1234DHR", "tm" : "Hyundai", "model" : "Oskarsuko"},
  //more vehicles
]

I want my model's field name to be JSON's fields tm and model concatenated. I have though to use a JsonDeserializer but, how can I get the whole JSON object inside?

class MyDeserializer implements JsonDeserializer<String, String> {

    @Override
    public String deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        // I need the entire JSON here, in order to concatenate two fields
    }
}

Thanks!

Answer 1

If I understand your question, you can have 2 setters which work on the same private field, and then you can mark the setters with @JsonProperty instead of the field. This can help you: @JsonProperty annotation on field as well as getter/setter

You can also play with @JsonGetter("var") and @JsonSetter("var") instead of @JsonProperty.

EDIT: Ok, a solution. It's the ugliest code I ever submitted, but if you want a fast thing and you can't really modify the POJO original interface (field, getter)

public class VehicleRestModel {

    private String concatValue = "";
    private int splitIndex;   

    @JsonSetter("var1")
    public setVar1(String var1){ concatValue = var1 + concatValue.substring(splitIndex,concatValue.length()); ; splitIndex = var1.length(); }
    @JsonSetter("var2")
    public setVar2(String var2){ concatValue = concatValue.substring(0,splitIndex) + var2; }

}

Be careful with nulls, if you care, as they get appended as a literal in this demo code.