mirror of
https://github.com/tiennm99/java-design-patterns.git
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feature: Embedded value pattern (#2384)
* Emdedded value design pattern * Adding suggested changes * Adding module in parent POM * Fixed checkstyle errors
This commit is contained in:
Shivanagouda Agasimani
committed by
GitHub
GitHub
parent
7d2832f412
commit
b2eb312b5e
@@ -0,0 +1,114 @@
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/*
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* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
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*
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* The MIT License
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* Copyright © 2014-2022 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
|
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.embedded.value;
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import java.util.stream.Collectors;
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import lombok.extern.slf4j.Slf4j;
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/*
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* Many small objects make sense in an OO system that don’t make sense as
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* tables in a database. Examples include currency-aware money objects (amount, currency) and date
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* ranges. Although the default thinking is to save an object as a table, no sane
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* person would want a table of money values.
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*
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* An Embedded Value maps the values of an object to fields in the record of
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* the object’s owner. In this implementation we have an Order object with links to an
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* ShippingAddress object. In the resulting table the fields in the ShippingAddress
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* object map to fields in the Order table rather than make new records
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* themselves.
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*/
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@Slf4j
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public class App {
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/**
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* Program entry point.
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*
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* @param args command line args.
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* @throws Exception if any error occurs.
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*
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*/
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public static void main(String[] args) throws Exception {
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final var dataSource = new DataSource();
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// Orders to insert into database
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final var order1 = new Order("JBL headphone", "Ram",
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new ShippingAddress("Bangalore", "Karnataka", "560040"));
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final var order2 = new Order("MacBook Pro", "Manjunath",
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new ShippingAddress("Bangalore", "Karnataka", "581204"));
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final var order3 = new Order("Carrie Soto is Back", "Shiva",
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new ShippingAddress("Bangalore", "Karnataka", "560004"));
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/**
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* Create table for orders - Orders(id, name, orderedBy, city, state, pincode).
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* We can see that table is different from the Order object we have.
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* We're mapping ShippingAddress into city, state, pincode colummns of the database and not creating a separate table.
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*/
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if (dataSource.createSchema()) {
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LOGGER.info("TABLE CREATED");
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LOGGER.info("Table \"Orders\" schema:\n" + dataSource.getSchema());
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} else {
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//If not able to create table, there's nothing we can do further.
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LOGGER.error("Error creating table");
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System.exit(0);
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}
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// Initially, database is empty
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LOGGER.info("Orders Query: {}", dataSource.queryOrders().collect(Collectors.toList()));
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//Insert orders where shippingAddress is mapped to different columns of the same table
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dataSource.insertOrder(order1);
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dataSource.insertOrder(order2);
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dataSource.insertOrder(order3);
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/**
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* Query orders
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* We'll create ShippingAddress object from city, state, pincode values from the table
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* and add it to Order object
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*/
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LOGGER.info("Orders Query: {}", dataSource.queryOrders().collect(Collectors.toList()) + "\n");
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//Query order by given id
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LOGGER.info("Query Order with id=2: {}", dataSource.queryOrder(2));
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/**
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* Remove order by given id.
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* Since we'd mapped address in the same table, deleting order will also take
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* out the shipping address details
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*/
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LOGGER.info("Remove Order with id=1");
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dataSource.removeOrder(1);
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LOGGER.info("\nOrders Query: {}", dataSource.queryOrders().collect(Collectors.toList()) + "\n");
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//After successfull demonstration of the pattern, drop the table
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if (dataSource.deleteSchema()) {
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LOGGER.info("TABLE DROPPED");
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} else {
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//If there's a potential error while dropping table
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LOGGER.error("Error deleting table");
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}
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}
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}
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@@ -0,0 +1,217 @@
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/*
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* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
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*
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* The MIT License
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* Copyright © 2014-2022 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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* copies of the Software, and to permit persons to whom the Software is
|
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.embedded.value;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.util.stream.Stream;
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import lombok.extern.slf4j.Slf4j;
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/*
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* Communicates with H2 database with the help of JDBC API
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*
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* Inherits the SQL queries and methods from @link AbstractDataSource class
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*/
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@Slf4j
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public class DataSource implements DataSourceInterface {
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private Connection conn;
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/**
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* Statements are objects which are used to execute queries which will not be
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* repeated.
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*/
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private Statement getschema;
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private Statement deleteschema;
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private Statement queryOrders;
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/*
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* PreparedStatements are used to execute queries which will be repeated.
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*/
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private PreparedStatement insertIntoOrders;
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private PreparedStatement removeorder;
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private PreparedStatement queyOrderByID;
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/**
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* {@summary}
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* Establish connection to database.
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*/
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public DataSource() {
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try {
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conn = DriverManager.getConnection(JDBC_URL);
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LOGGER.info("Connected to H2 in-memory database: " + conn.getCatalog());
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} catch (SQLException e) {
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LOGGER.error(e.getLocalizedMessage(), e.getCause());
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}
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}
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@Override
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public boolean createSchema() {
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try (Statement createschema = conn.createStatement()) {
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createschema.execute(CREATE_SCHEMA);
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insertIntoOrders = conn.prepareStatement(INSERT_ORDER, PreparedStatement.RETURN_GENERATED_KEYS);
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getschema = conn.createStatement();
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queryOrders = conn.createStatement();
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removeorder = conn.prepareStatement(REMOVE_ORDER);
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queyOrderByID = conn.prepareStatement(QUERY_ORDER);
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deleteschema = conn.createStatement();
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} catch (SQLException e) {
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LOGGER.error(e.getLocalizedMessage(), e.getCause());
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return false;
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}
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return true;
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}
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@Override
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public String getSchema() {
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try {
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var resultSet = getschema.executeQuery(GET_SCHEMA);
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var sb = new StringBuilder();
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while (resultSet.next()) {
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sb.append("Col name: " + resultSet.getString(1) + ", Col type: " + resultSet.getString(2) + "\n");
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}
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getschema.close();
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return sb.toString();
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} catch (Exception e) {
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LOGGER.error("Error in retrieving schema: {}", e.getLocalizedMessage(), e.getCause());
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}
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return "Schema unavailable";
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}
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@Override
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public boolean insertOrder(Order order) {
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try {
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conn.setAutoCommit(false);
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insertIntoOrders.setString(1, order.getItem());
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insertIntoOrders.setString(2, order.getOrderedBy());
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var address = order.getShippingAddress();
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insertIntoOrders.setString(3, address.getCity());
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insertIntoOrders.setString(4, address.getState());
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insertIntoOrders.setString(5, address.getPincode());
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var affectedRows = insertIntoOrders.executeUpdate();
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if (affectedRows == 1) {
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var rs = insertIntoOrders.getGeneratedKeys();
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rs.last();
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var insertedAddress = new ShippingAddress(address.getCity(), address.getState(), address.getPincode());
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var insertedOrder = new Order(rs.getInt(1), order.getItem(), order.getOrderedBy(),
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insertedAddress);
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conn.commit();
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LOGGER.info("Inserted: {}", insertedOrder);
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} else {
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conn.rollback();
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}
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} catch (Exception e) {
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LOGGER.error(e.getLocalizedMessage());
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} finally {
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try {
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conn.setAutoCommit(true);
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} catch (SQLException e) {
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LOGGER.error(e.getLocalizedMessage());
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}
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}
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return true;
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}
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@Override
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public Stream<Order> queryOrders() {
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var ordersList = new ArrayList<Order>();
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try (var rSet = queryOrders.executeQuery(QUERY_ORDERS)) {
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while (rSet.next()) {
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var order = new Order(rSet.getInt(1), rSet.getString(2), rSet.getString(3),
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new ShippingAddress(rSet.getString(4), rSet.getString(5),
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rSet.getString(6)));
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ordersList.add(order);
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}
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rSet.close();
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} catch (SQLException e) {
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LOGGER.error(e.getMessage(), e.getCause());
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}
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return ordersList.stream();
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}
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/**
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* {@summary}
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* Query order by given id.
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* @param id as the parameter
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* @return Order objct
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* @throws SQLException in case of unexpected events
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*/
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@Override
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public Order queryOrder(int id) throws SQLException {
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Order order = null;
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queyOrderByID.setInt(1, id);
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try (var rSet = queyOrderByID.executeQuery()) {
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queyOrderByID.setInt(1, id);
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if (rSet.next()) {
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var address = new ShippingAddress(rSet.getString(4),
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rSet.getString(5), rSet.getString(6));
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order = new Order(rSet.getInt(1), rSet.getString(2), rSet.getString(3), address);
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}
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rSet.close();
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} catch (Exception e) {
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LOGGER.error(e.getLocalizedMessage(), e.getCause());
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}
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return order;
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}
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@Override
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public void removeOrder(int id) throws Exception {
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try {
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conn.setAutoCommit(false);
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removeorder.setInt(1, id);
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if (removeorder.executeUpdate() == 1) {
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LOGGER.info("Order with id " + id + " successfully removed");
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} else {
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LOGGER.info("Order with id " + id + " unavailable.");
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}
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} catch (Exception e) {
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LOGGER.error(e.getLocalizedMessage(), e.getCause());
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conn.rollback();
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} finally {
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conn.setAutoCommit(true);
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}
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}
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@Override
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public boolean deleteSchema() throws Exception {
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try {
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deleteschema.execute(DELETE_SCHEMA);
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queryOrders.close();
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queyOrderByID.close();
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deleteschema.close();
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insertIntoOrders.close();
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conn.close();
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return true;
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} catch (Exception e) {
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LOGGER.error(e.getLocalizedMessage(), e.getCause());
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}
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return false;
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}
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}
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@@ -0,0 +1,69 @@
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/*
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* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
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*
|
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* 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
|
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* THE SOFTWARE.
|
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*/
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package com.iluwatar.embedded.value;
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import java.sql.SQLException;
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import java.util.stream.Stream;
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/*
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* Abstract class which contains the required SQL queries and basic methods declaration.
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*
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* The main thing to consider is that the ShippingAddress object doesn't have it's own class
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* but it's values are stored into the Orders table as city, state, pincode
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*
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*/
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interface DataSourceInterface {
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final String JDBC_URL = "jdbc:h2:mem:Embedded-Value";
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final String CREATE_SCHEMA = "CREATE TABLE Orders (Id INT AUTO_INCREMENT, item VARCHAR(50) NOT NULL, orderedBy VARCHAR(50)"
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+ ", city VARCHAR(50), state VARCHAR(50), pincode CHAR(6) NOT NULL, PRIMARY KEY(Id))";
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final String GET_SCHEMA = "SHOW COLUMNS FROM Orders";
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final String INSERT_ORDER = "INSERT INTO Orders (item, orderedBy, city, state, pincode) VALUES(?, ?, ?, ?, ?)";
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final String QUERY_ORDERS = "SELECT * FROM Orders";
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final String QUERY_ORDER = QUERY_ORDERS + " WHERE Id = ?";
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final String REMOVE_ORDER = "DELETE FROM Orders WHERE Id = ?";
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final String DELETE_SCHEMA = "DROP TABLE Orders";
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boolean createSchema() throws SQLException;
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String getSchema() throws SQLException;
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boolean insertOrder(Order order) throws SQLException;
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Stream<Order> queryOrders() throws SQLException;
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Order queryOrder(int id) throws SQLException;
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void removeOrder(int id) throws Exception;
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boolean deleteSchema() throws Exception;
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}
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@@ -0,0 +1,61 @@
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/*
|
||||
* 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 lombok.Getter;
|
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import lombok.Setter;
|
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import lombok.ToString;
|
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/*
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* A POJO which represents the Order object.
|
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*/
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@ToString
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@Setter
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@Getter
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public class Order {
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private int id;
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private String item;
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private String orderedBy;
|
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private ShippingAddress shippingAddress;
|
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|
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/**
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* Constructor for Item object.
|
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* @param item item name
|
||||
* @param orderedBy item orderer
|
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* @param shippingAddress shipping address details
|
||||
*/
|
||||
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public Order(String item, String orderedBy, ShippingAddress shippingAddress) {
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this.item = item;
|
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this.orderedBy = orderedBy;
|
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this.shippingAddress = shippingAddress;
|
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}
|
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public Order(int id, String item, String orderedBy, ShippingAddress shippingAddress) {
|
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this(item, orderedBy, shippingAddress);
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this.id = id;
|
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}
|
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|
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}
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@@ -0,0 +1,54 @@
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/*
|
||||
* 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 lombok.Getter;
|
||||
import lombok.ToString;
|
||||
|
||||
/**
|
||||
* Another POJO which wraps the Shipping details of order into Object.
|
||||
*/
|
||||
@ToString
|
||||
@Getter
|
||||
public class ShippingAddress {
|
||||
|
||||
private String city;
|
||||
private String state;
|
||||
private String pincode;
|
||||
|
||||
/**
|
||||
* Constructor for Shipping Address object.
|
||||
* @param city City name
|
||||
* @param state State name
|
||||
* @param pincode Pin code of the city
|
||||
*
|
||||
*/
|
||||
public ShippingAddress(String city, String state, String pincode) {
|
||||
this.city = city;
|
||||
this.state = state;
|
||||
this.pincode = pincode;
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user