oglimmer/ggo

package de.oglimmer.atmospheremvc.game;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import de.oglimmer.atmospheremvc.util.Json;

abstract public class UIState implements Serializable {

    private static final long serialVersionUID = 1L;

    private transient JsonNode lastSendData;

    abstract protected Object getState();

    public JsonNode getJSON() {
        ObjectMapper mapper = new ObjectMapper();
        JsonNode newJSON = mapper.valueToTree(getState());
        JsonNode diff;
        if (lastSendData != null) {
            diff = Json.INSTANCE.diff(newJSON, lastSendData);
        } else {
            diff = newJSON;
        }
        lastSendData = newJSON;
        return diff;
    }

    private void writeObject(ObjectOutputStream oos) throws IOException {
        oos.defaultWriteObject();
        ObjectMapper mapper = new ObjectMapper();
        oos.writeUTF(mapper.writeValueAsString(lastSendData));
    }

    private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
        ois.defaultReadObject();
        ObjectMapper mapper = new ObjectMapper();
        lastSendData = mapper.readTree(ois.readUTF());
    }
}