// Path: src/main/java/business/ValidationException.java
// public class ValidationException extends Exception {
// 
// 
//     private List<String> invalidFieldNames = new ArrayList<>();
// 
//     public ValidationException() {
//     }
// 
//     public ValidationException(String invalidFieldName) {
//         super();
//         fieldError(invalidFieldName);
//     }
// 
//     public ValidationException fieldError(String fieldName) {
//         invalidFieldNames.add(fieldName);
//         return this;
//     }
// 
// 
//     public boolean hasErrors() {
//         return !invalidFieldNames.isEmpty();
//     }
// 
//     public List<String> getInvalidFieldNames() {
//         return invalidFieldNames;
//     }
// 
//     public boolean hasInvalidField(String name) {
//         return invalidFieldNames.contains(name);
//     }
// }
// 
// Path: src/main/java/business/product/Product.java
// public class Product {
// 
//     private long productId;
//     private String name;
//     private int price;
//     private Date lastUpdate;
// 
//     public Product(long productId, String name, int price, Date lastUpdate) {
//         this.productId = productId;
//         this.name = name;
//         this.price = price;
//         this.lastUpdate = lastUpdate;
//     }
// 
//     public long getProductId() {
//         return productId;
//     }
//     public String getName() {
//         return name;
//     }
// 
//     public int getPrice() {
//         return price;
//     }
// 
//     public Date getLastUpdate() {
//         return lastUpdate;
//     }
// 
//     @Override
//     public String toString() {
//         return "business.product.Product[product_id=" + productId + "]";
//     }
// 
// }


import business.ValidationException;
import business.product.Product;
import java.util.ArrayList;
import java.util.List;
/**
 * BSD 3-Clause License
 *
 * Copyright (C) 2018 Steven Atkinson <steven@nowucca.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package business.cart;


/**
 *
 */
public class ShoppingCart {

    List<ShoppingCartItem> items;
    int numberOfItems;
    int total;

    public ShoppingCart() {
        items = new ArrayList<>();
        numberOfItems = 0;
        total = 0;
    }

    /**
     * Adds a <code>ShoppingCartItem</code> to the <code>ShoppingCart</code>'s
     * <code>items</code> list. If item of the specified <code>product</code>
     * already exists in shopping cart list, the quantity of that item is
     * incremented, and the original price remains unchanged.
     *
     * @see ShoppingCartItem
     */
    public synchronized void addItem(Product product) {

        boolean newItem = true;

        for (ShoppingCartItem scItem : items) {

            if (scItem.getProductId() == product.getProductId()) {

                newItem = false;
                scItem.quantity++;
            }
        }

        if (newItem) {
            ShoppingCartItem scItem = new ShoppingCartItem(product);
            items.add(scItem);
        }
    }


    /**
     * Updates the <code>ShoppingCartItem</code> of the specified
     * <code>product</code> to the specified quantity. If '<code>0</code>'
     * is the given quantity, the <code>ShoppingCartItem</code> is removed
     * from the <code>ShoppingCart</code>'s <code>items</code> list.
     *
     * @param quantity the number which the <code>ShoppingCartItem</code> is updated to
     * @see ShoppingCartItem
     */
// Path: src/main/java/business/ValidationException.java
// public class ValidationException extends Exception {
// 
// 
//     private List<String> invalidFieldNames = new ArrayList<>();
// 
//     public ValidationException() {
//     }
// 
//     public ValidationException(String invalidFieldName) {
//         super();
//         fieldError(invalidFieldName);
//     }
// 
//     public ValidationException fieldError(String fieldName) {
//         invalidFieldNames.add(fieldName);
//         return this;
//     }
// 
// 
//     public boolean hasErrors() {
//         return !invalidFieldNames.isEmpty();
//     }
// 
//     public List<String> getInvalidFieldNames() {
//         return invalidFieldNames;
//     }
// 
//     public boolean hasInvalidField(String name) {
//         return invalidFieldNames.contains(name);
//     }
// }
// 
// Path: src/main/java/business/product/Product.java
// public class Product {
// 
//     private long productId;
//     private String name;
//     private int price;
//     private Date lastUpdate;
// 
//     public Product(long productId, String name, int price, Date lastUpdate) {
//         this.productId = productId;
//         this.name = name;
//         this.price = price;
//         this.lastUpdate = lastUpdate;
//     }
// 
//     public long getProductId() {
//         return productId;
//     }
//     public String getName() {
//         return name;
//     }
// 
//     public int getPrice() {
//         return price;
//     }
// 
//     public Date getLastUpdate() {
//         return lastUpdate;
//     }
// 
//     @Override
//     public String toString() {
//         return "business.product.Product[product_id=" + productId + "]";
//     }
// 
// }


// Path: src/main/java/business/cart/ShoppingCart.java
import business.ValidationException;
import business.product.Product;
import java.util.ArrayList;
import java.util.List;

/**
 * BSD 3-Clause License
 *
 * Copyright (C) 2018 Steven Atkinson <steven@nowucca.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package business.cart;


/**
 *
 */
public class ShoppingCart {

    List<ShoppingCartItem> items;
    int numberOfItems;
    int total;

    public ShoppingCart() {
        items = new ArrayList<>();
        numberOfItems = 0;
        total = 0;
    }

    /**
     * Adds a <code>ShoppingCartItem</code> to the <code>ShoppingCart</code>'s
     * <code>items</code> list. If item of the specified <code>product</code>
     * already exists in shopping cart list, the quantity of that item is
     * incremented, and the original price remains unchanged.
     *
     * @see ShoppingCartItem
     */
    public synchronized void addItem(Product product) {

        boolean newItem = true;

        for (ShoppingCartItem scItem : items) {

            if (scItem.getProductId() == product.getProductId()) {

                newItem = false;
                scItem.quantity++;
            }
        }

        if (newItem) {
            ShoppingCartItem scItem = new ShoppingCartItem(product);
            items.add(scItem);
        }
    }


    /**
     * Updates the <code>ShoppingCartItem</code> of the specified
     * <code>product</code> to the specified quantity. If '<code>0</code>'
     * is the given quantity, the <code>ShoppingCartItem</code> is removed
     * from the <code>ShoppingCart</code>'s <code>items</code> list.
     *
     * @param quantity the number which the <code>ShoppingCartItem</code> is updated to
     * @see ShoppingCartItem
     */
    public synchronized void update(Product product , short quantity) throws ValidationException {