feat: Add Dao

src/models/DaoFactory.ts

@@ -0,0 +1,63 @@
+import Client from './Client'
+import ConfigDao from './Config/ConfigDao'
+import Dao from './Dao'
+import UserDao from './User/UserDao'
+
+/**
+ * TODO:
+ * Add to `DaoItem` your model name
+ * Add to the function `initDao` the Dao
+ */
+
+/**
+ * the different Daos that can be initialized
+ *
+ * Touch this interface to define which key is linked to which Dao
+ */
+interface DaoItem {
+	config: ConfigDao
+	user: UserDao
+}
+
+/**
+ * Class to get any DAO
+ */
+export default class DaoFactory {
+	/**
+	 * reference of the different Daos for a correct singleton implementation
+	 */
+	private static daos: Partial<DaoItem> = {}
+
+	/**
+	 * Get a a dao by its key
+	 *
+	 * it will throw an error if no Dao exists linked to the item key
+	 *
+	 * @param key the dao key to get
+	 * @returns the Dao you want as a singleton
+	 */
+	public static get<Key extends keyof DaoItem>(key: Key): DaoItem[Key] {
+		if (!(key in this.daos)) {
+			const dao = this.initDao(key)
+			if (!dao) {
+				throw new Error(`${key} has no valid Dao`)
+			}
+			this.daos[key] = dao as DaoItem[Key]
+		}
+		return this.daos[key] as DaoItem[Key]
+	}
+
+	/**
+	 * init a dao by its key, it does not care if it exists or not
+	 *
+	 * @param item the element to init
+	 * @returns a new initialized dao or undefined if no dao is linked
+	 */
+	private static initDao(item: keyof DaoItem): Dao<any> | undefined {
+		switch (item) {
+			case 'config': return new ConfigDao()
+			case 'user': return new UserDao()
+			default: return undefined
+		}
+	}
+}