added entity

whatsapp-web.js/src/models/entity.js

@@ -0,0 +1,46 @@
+
+
+class Entity {
+    
+    constructor(){
+        this.data = new Map();  
+        this.count = 0;
+    }
+
+    addData(key ,value){
+        if(!this.isData(key)){
+            this.data[key] = value;
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * check if key exists
+     * @param {string} key 
+     */
+    isData(key){
+        return this.data[key] != undefined ? true : false;
+    }
+
+    deleteData(key){
+        if(this.isData(key)){
+            return delete this.data[key];
+        }
+        return false;
+    }
+
+    clearData(){
+        this.data = new Map();
+        this.count = 0;
+    }
+
+    getData(key){
+        if(this.isData(key)){
+            return this.data[key];
+        }
+        return null;
+    }
+}
+
+module.exports.Entity = Entity;