mmpataki · July 28, 2021 07:57 · Jul 28, 2021 · Jul 28, 2021
diff --git a/output b/output
@@ -0,0 +1,4 @@
+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}}
diff --git a/Dish.java b/Dish.java
@@ -0,0 +1,54 @@
+/*
+ * 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 +
+                '}';
+    }
+}
diff --git a/Main.java b/Main.java
@@ -0,0 +1,16 @@
+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);
+    }
+}
diff --git a/Updateable.java b/Updateable.java
@@ -0,0 +1,23 @@
+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);
+    }
+}
diff --git a/UpdateableMongoStore.java b/UpdateableMongoStore.java
@@ -0,0 +1,22 @@
+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 */
+}
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