Saving firebase ServerValue.TIMESTAMP on AutoValue POJOs

Question

Android chat crashes on DataSnapshot.getValue() for timestamp

I'm trying to add a timestamp property to my POJO. The solution above tells jackson to ignore the real data member which is used by the application. I'm using AutoValue and can't figure out how I could annotate my class to get it to work.

@AutoValue
public abstract class Pojo {

    @JsonProperty("id") public abstract String id();
    @JsonProperty("name") public abstract String name();
    @JsonProperty("date") public abstract long date();

    @JsonCreator public static Pojo create(String id, String name, long date) {
        return new AutoValue_Pojo(id, name, date);
    }
}

I tried using a custom serializer:

public class TimeStampSerializer extends JsonSerializer<Long> {
    @Override public void serialize(Long value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
        jgen.writeString(ServerValue.TIMESTAMP.toString());
    }
}

but that wrote the string date: "{.sv=timestamp}" to firebase instead of generating the timestamp

Answer 1

Caught my mistake:

@AutoValue
public abstract class Pojo {


    @JsonProperty("id") public abstract String id();

    @JsonProperty("name") public abstract String name();

    //Custom serializer
    @JsonSerialize(using = TimestampSerializer.class) @JsonProperty("date") public abstract long date();

    @JsonCreator public static Pojo create(@JsonProperty("id") String id, @JsonProperty("name") String name, @JsonProperty("date") long date) {
        return new AutoValue_Pojo(id, name, date);
    }
}

public class TimestampSerializer extends JsonSerializer<Long> {
    @Override public void serialize(Long value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
        //Use writeObject() instead of writeString()
        jgen.writeObject(ServerValue.TIMESTAMP);
    }
}