Updateable Mongo Store

Dish.java

/*
 * Model to be stored
 */
public class Dish extends Updateable {

    String name;
    String originCountry;
    String recipe;

    public Dish(String name, String originCountry, String recipe) {
        this.name = name;
        this.originCountry = originCountry;
        this.recipe = recipe;
    }

    /* updates */
    public void setName(String name) {
        doUpdate("name", this.name, name);
        this.name = name;
    }

    public void setOriginCountry(String originCountry) {
        doUpdate("originCountry", this.originCountry, originCountry);
        this.originCountry = originCountry;
    }

    public void setRecipe(String recipe) {
        doUpdate("recipe", this.recipe, recipe);
        this.recipe = recipe;
    }

    /* getters */
    public String getName() {
        return name;
    }

    public String getOriginCountry() {
        return originCountry;
    }

    public String getRecipe() {
        return recipe;
    }

    @Override
    public String toString() {
        return "Dish{" +
                "name='" + name + '\'' +
                ", originCountry='" + originCountry + '\'' +
                ", recipe='" + recipe + '\'' +
                ", updates=" + updates +
                '}';
    }
}

Main.java

public class Main {
    public static void main(String[] args) {

        UpdateableMongoStore ums = new UpdateableMongoStore();

        Dish idli = new Dish("idli", "india", "ask your mom!");

        /* save it first time */
        ums.save(idli);

        /* update it */
        idli.setRecipe("mom is not home, get it from a hotel");

        ums.save(idli);
    }
}

output

new object
Dish{name='idli', originCountry='india', recipe='ask your mom!', updates={}}
update an object
Dish{name='idli', originCountry='india', recipe='mom is not home, get it from a hotel', updates={recipe=mom is not home, get it from a hotel}}

Updateable.java

import java.util.HashMap;

public abstract class Updateable {

    public HashMap<String, Object> updates = new HashMap<>();

    public void put(String field, Object value) {
        updates.put(field, value);
    }

    public boolean isUpdated() {
        return !updates.isEmpty();
    }

    public HashMap<String, Object> getUpdates() {
        return updates;
    }

    protected void doUpdate(String key, String curVal, String newVal) {
        if(!curVal.equals(newVal))
            updates.put(key, newVal);
    }
}

UpdateableMongoStore.java

public class UpdateableMongoStore {

    public void save(Updateable updateable) {

        if(!updateable.isUpdated()) {

            System.out.println("new object");
            System.out.println(updateable);

        } else {

            System.out.println("update an object");
            System.out.println(updateable);

            /* build some update query using `updateable.getUpdates()` */

            /* save them to store */
        }
    }

    /* other store methods */
}