session-facade/src/main/java/com/iluwatar/sessionfacade/OrderService.java - master - githubmirror/java-design-patterns

session-facade/src/main/java/com/iluwatar/sessionfacade/OrderService.java

78 строк3 KB

Ilkka Seppälä

deps: Refactor dependencies (#3224)

29 мар 2025, 20:34

29 мар 2025, 20:340ca162a

/*
 * 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.sessionfacade;

import java.util.Map;
import lombok.extern.slf4j.Slf4j;

/**
 * The OrderService class is responsible for finalizing a customer's order. It includes a method to
 * calculate the total cost of the order, which follows the information expert principle from GRASP
 * by assigning the responsibility of total calculation to this service. Additionally, it provides a
 * method to complete the order, which empties the client's shopping cart once the order is
 * finalized.
 */
@Slf4j
public class OrderService {
  private final Map<Integer, Product> cart;

  /**
   * Instantiates a new Order service.
   *
   * @param cart the cart
   */
  public OrderService(Map<Integer, Product> cart) {
    this.cart = cart;
  }

  /** Order. */
  public void order() {
    Double total = getTotal();
    if (!this.cart.isEmpty()) {
      LOGGER.info(
          "Client has chosen to order {} with total {}", cart, String.format("%.2f", total));
      this.completeOrder();
    } else {
      LOGGER.info("Client's shopping cart is empty");
    }
  }

  /**
   * Gets total.
   *
   * @return the total
   */
  public double getTotal() {
    final double[] total = {0.0};
    this.cart.forEach((key, product) -> total[0] += product.price());
    return total[0];
  }

  /** Complete order. */
  public void completeOrder() {
    this.cart.clear();
  }
}