feature: Embedded value pattern (#2384)

* Emdedded value design pattern

* Adding suggested changes

* Adding module in parent POM

* Fixed checkstyle errors

embedded-value/src/main/java/com/iluwatar/embedded/value/DataSourceInterface.java

@@ -0,0 +1,69 @@
+/*
+ * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
+ *
+ * The MIT License
+ * Copyright © 2014-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.embedded.value;
+
+import java.sql.SQLException;
+import java.util.stream.Stream;
+
+/*
+ * Abstract class which contains the required SQL queries and basic methods declaration.
+ * 
+ * The main thing to consider is that the ShippingAddress object doesn't have it's own class
+ * but it's values are stored into the Orders table as city, state, pincode
+ * 
+ */
+interface DataSourceInterface {
+  
+  final String JDBC_URL = "jdbc:h2:mem:Embedded-Value";
+  
+  final String CREATE_SCHEMA = "CREATE TABLE Orders (Id INT AUTO_INCREMENT, item VARCHAR(50) NOT NULL, orderedBy VARCHAR(50)"
+      + ", city VARCHAR(50), state VARCHAR(50), pincode CHAR(6) NOT NULL, PRIMARY KEY(Id))";
+  
+  final String GET_SCHEMA = "SHOW COLUMNS FROM Orders";
+  
+  final String INSERT_ORDER = "INSERT INTO Orders (item, orderedBy, city, state, pincode) VALUES(?, ?, ?, ?, ?)";
+  
+  final String QUERY_ORDERS = "SELECT * FROM Orders";
+  
+  final String QUERY_ORDER = QUERY_ORDERS + " WHERE Id = ?";
+  
+  final String REMOVE_ORDER = "DELETE FROM Orders WHERE Id = ?";
+  
+  final String DELETE_SCHEMA = "DROP TABLE Orders";
+  
+  boolean createSchema() throws SQLException;
+  
+  String getSchema() throws SQLException;
+  
+  boolean insertOrder(Order order) throws SQLException;
+  
+  Stream<Order> queryOrders() throws SQLException;
+  
+  Order queryOrder(int id) throws SQLException;
+  
+  void removeOrder(int id) throws Exception;
+  
+  boolean deleteSchema() throws Exception;
+}