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<!DOCTYPE html>
<html>
<head>
<title>Chat GPT: ${title}</title>
<meta name="generator" content="chatGPT Saving Bookmark"/>
<style>
body {
background-color: rgb(32,33,35);
color: rgb(236,236,241);
font-size: 16px;
font-family: sans-serif;
line-height: 28px;
margin: -10px;
}
body > .w-full {
padding: 30px;
}
/* prompt */
body > .w-full:nth-child(2n+1) {
background: rgb(52,53,65);
}
/* response */
body > .w-full:nth-child(2n+2) {
background: rgb(68,70,84);
}
a, a:visited {
color: #7792cd;
}
pre {
margin: 0 0 1em 0;
display: inline-block;
width: 100%;
}
pre code.hljs {
margin-bottom: 1em;
border-radius: 5px;
}
.whitespace-pre-wrap {
white-space: pre-wrap;
}
.flex-col {
max-width: 850px;
margin: 0px auto;
}
pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{background:#f3f3f3;color:#444}.hljs-comment{color:#697070}.hljs-punctuation,.hljs-tag{color:#444a}.hljs-tag .hljs-attr,.hljs-tag .hljs-name{color:#444}.hljs-attribute,.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-name,.hljs-selector-tag{font-weight:700}.hljs-deletion,.hljs-number,.hljs-quote,.hljs-selector-class,.hljs-selector-id,.hljs-string,.hljs-template-tag,.hljs-type{color:#800}.hljs-section,.hljs-title{color:#800;font-weight:700}.hljs-link,.hljs-operator,.hljs-regexp,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-symbol,.hljs-template-variable,.hljs-variable{color:#ab5656}.hljs-literal{color:#695}.hljs-addition,.hljs-built_in,.hljs-bullet,.hljs-code{color:#397300}.hljs-meta{color:#1f7199}.hljs-meta .hljs-string{color:#38a}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}
</style>
</head>
<body><div class="flex w-full items-center justify-center gap-1 border-b border-black/10 bg-gray-50 p-3 text-gray-500 dark:border-gray-900/50 dark:bg-gray-700 dark:text-gray-300">Model: GPT-4</div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">You need to develop an eCommerce system for a small online shop.
The shop sells things. A thing has a name, description, size, purchase price, and a sales price.
The shop sells things to customers. A customer has a name, a mail address, and an address (with street, city,
and postal code). There is no username, so a customer can only be identified by his mail address.
A customer can place an order for one or more things. An order consists of one or several order positions.
An order position references a thing, and contains the quantity of the thing that is ordered.
The shop has a catalog which stores all things. For each thing, the stock quantity is stored in the catalog. For some
things, the stock quantity is zero. In that case, the thing is out of stock, and not available for sale at moment.
Customers can order only things that are in stock, i.e. have stock quantity > 0.
Shop admins can manually change the stock quantity for a thing, add new things to the catalog, or remove
things from the catalog.
When a customer orders things, he/she puts them in the shopping basket first. By that action, the things are reserved for the customer, and cannot be ordered by other customers. There is no time limit for the reservation.
The customer can remove things from the shopping basket, or check out.
Please create a logical data model for the shop system. The logical data model should represent the entities, value objects and relationships described above. </div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>Here's a logical data model for the described eCommerce system:</p><p>Entities:</p><ol><li><p>Thing</p><ul><li>ID (Primary Key)</li><li>Name</li><li>Description</li><li>Size</li><li>PurchasePrice</li><li>SalesPrice</li></ul></li><li><p>Customer</p><ul><li>Email (Primary Key)</li><li>Name</li><li>StreetAddress</li><li>City</li><li>PostalCode</li></ul></li><li><p>Order</p><ul><li>ID (Primary Key)</li><li>CustomerEmail (Foreign Key: Customer.Email)</li><li>OrderDate</li></ul></li><li><p>OrderPosition</p><ul><li>ID (Primary Key)</li><li>OrderID (Foreign Key: Order.ID)</li><li>ThingID (Foreign Key: Thing.ID)</li><li>Quantity</li></ul></li><li><p>Catalog</p><ul><li>ThingID (Primary Key, Foreign Key: Thing.ID)</li><li>StockQuantity</li></ul></li><li><p>ShoppingCart</p><ul><li>CustomerEmail (Primary Key, Foreign Key: Customer.Email)</li><li>ThingID (Primary Key, Foreign Key: Thing.ID)</li><li>ReservedQuantity</li></ul></li></ol><p>Relationships:</p><ol><li>One Customer can place many Orders (1:N relationship between Customer and Order)</li><li>One Order can have multiple OrderPositions (1:N relationship between Order and OrderPosition)</li><li>One Thing can be referenced in multiple OrderPositions (1:N relationship between Thing and OrderPosition)</li><li>One Thing has one Catalog entry (1:1 relationship between Thing and Catalog)</li><li>One Customer can have multiple ShoppingCart entries (1:N relationship between Customer and ShoppingCart)</li><li>One Thing can be in multiple ShoppingCart entries (1:N relationship between Thing and ShoppingCart)</li></ol></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">You need to implement a minimal version (MVP) for this shop system. The functionalities of the MVP are predefined. There are four interfaces that you should implement, by implementing one or more Spring Boot Services. You should use the domain entities and value objects from the logical data model. Please use Spring JPA to persist the data.
The implementation must be below the package thkoeln.archilab.ecommerce.solution. You can create as many sub-packages and classes as you like here. The implementation must implement all interfaces from thkoeln.archilab.ecommerce.usecases.
I will now give you three interfaces that will need to be implemented. Firstly, just use this information to correctly and fully implement the Thing class, so that it will work with the methods defined in the interfaces.
package thkoeln.archilab.ecommerce.usecases;
import java.util.UUID;
/**
* This interface contains methods needed in the context of use cases dealing with managing the thing catalog.
* The interface is probably incomplete, and will grow over time.
*/
public interface ThingCatalogUseCases {
/**
* Adds a new thing to the shop catalog
* @param thingId
* @param name
* @param description
* @param size
* @param purchasePrice
* @param salesPrice
* @throws ShopException if ...
* - the thing id already exists,
* - name or description are null or empty,
* - the size is <= 0 (but can be null!),
* - the purchase price is null or <= 0,
* - the sales price is null or <= 0,
* - the sales price is lower than the purchase price
*/
public void addThingToCatalog( UUID thingId, String name, String description, Float size,
Float purchasePrice, Float salesPrice );
/**
* Removes a thing from the shop catalog
* @param thingId
* @throws ShopException if
* - the thing id does not exist
* - the thing is still in stock
* - the thing is still reserved in a shopping basket, or part of a completed order
*/
public void removeThingFromCatalog( UUID thingId );
/**
* Get the sales price of a given thing
* @param thingId
* @return the sales price
* @throws ShopException if the thing id does not exist
*/
public Float getSalesPrice( UUID thingId );
/**
* Clears the thing catalog, i.e. removes all things from the catalog, including all the stock,
* all the reservations and all the orders.
*/
public void deleteThingCatalog();
}
package thkoeln.archilab.ecommerce.usecases;
import java.util.Map;
import java.util.UUID;
/**
* This interface contains methods needed in the context of use cases dealing with the shopping basket.
* The interface is probably incomplete, and will grow over time.
*/
public interface ShoppingBasketUseCases {
/**
* Adds a thing to the cart of a customer
*
* @param customerMailAddress
* @param thingId
* @param quantity
* @throws ShopException if ...
* - the customer with the given mailAddress does not exist,
* - the thing does not exist,
* - the quantity is negative,
* - the thing is not available in the requested quantity
*/
public void addThingToShoppingBasket( String customerMailAddress, UUID thingId, int quantity );
/**
* Removes a thing from the cart of a customer
*
* @param customerMailAddress
* @param thingId
* @param quantity
* @throws ShopException if ...
* - the customer with the given mailAddress does not exist,
* - the thing does not exist
* - the quantity is negative
* - the thing is not in the cart in the requested quantity
*/
public void removeThingFromShoppingBasket( String customerMailAddress, UUID thingId, int quantity );
/**
* Returns a map showing which things are in the cart of a customer and how many of each thing
*
* @param customerMailAddress
* @return the cart of the customer (map is empty if the cart is empty)
* @throws ShopException if the customer with the given mailAddress does not exist
*/
public Map<UUID, Integer> getShoppingBasketAsMap( String customerMailAddress );
/**
* Returns the current value of all things in the cart of a customer
*
* @param customerMailAddress
* @return the cart of the customer
* @throws ShopException if the customer with the given mailAddress does not exist
*/
public float getShoppingBasketAsMoneyValue( String customerMailAddress );
/**
* Get the number units of a specific thing that are currently reserved in the shopping baskets of all customers
* @param thingId
* @throws ShopException if the thing id does not exist
*/
public int getReservedStockInShoppingBaskets( UUID thingId );
/**
* Checks out the cart of a customer
*
* @param customerMailAddress
* @throws ShopException if the customer with the given mailAddress does not exist, or if the cart is empty
*/
public void checkout( String customerMailAddress );
/**
* Returns a map showing which things have been ordered by a customer and how many of each thing
*
* @param customerMailAddress
* @return the order history of the customer (map is empty if the customer has not ordered anything yet)
* @throws ShopException if the customer with the given mailAddress does not exist
*/
public Map<UUID, Integer> getOrderHistory( String customerMailAddress );
/**
* Deletes all orders and shopping baskets in the system
*/
public void deleteAllOrders();
}
package thkoeln.archilab.ecommerce.usecases;
import java.util.UUID;
/**
* This interface contains methods needed in the context of use cases dealing with managing the shop stock,
* i.e. adding and removing things in the warehouse. The interface is probably incomplete, and
* will grow over time.
*/
public interface StockManagementUseCases {
/**
* Adds a certain quantity of a given thing to the stock
* @param thingId
* @param addedQuantity
* @throws ShopException if the thing id does not exist, or if the added quantity is negative
*/
public void addToStock( UUID thingId, int addedQuantity );
/**
* Removes a certain quantity of a given thing from the stock.
* If the new total quantity is lower than the currently reserved things, some of currently reserved things
* (in the customers' shopping baskets) are removed. This means that some of the reserved things are lost for
* the customer. (This is necessary because there probably was a mistake in the stock management, a mis-counting,
* or some of the things were stolen from the warehouse, are broken, etc.)
* @param thingId
* @param removedQuantity
* @throws ShopException if ...
* - the thing id does not exist
* - if the removed quantity is negative
* - if the removed quantity is greater than the current stock and the currently reserved things together
*/
public void removeFromStock( UUID thingId, int removedQuantity );
/**
* Changes the total quantity of a given thing in the stock.
* If the new total quantity is lower than the currently reserved things, some of currently reserved things
* (in the customers' shopping baskets) are removed. This means that some of the reserved things are lost for
* the customer. (This is necessary because there probably was a mistake in the stock management, a mis-counting,
* or some of the things were stolen from the warehouse, are broken, etc.)
* @param thingId
* @param newTotalQuantity
* @throws ShopException if ...
* - the thing id does not exist
* - if the new total quantity is negative
*/
public void changeStockTo( UUID thingId, int newTotalQuantity );
/**
* Get the current total stock of a given thing, including the currently reserved things
* @param thingId
* @throws ShopException if the thing id does not exist
*/
public int getAvailableStock( UUID thingId );
}</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>Here is the initial implementation of the Thing class, as per the requirements from the interfaces:</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.Entity;
<span class="hljs-keyword">import</span> javax.persistence.Id;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">Thing</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-keyword">private</span> UUID id;
<span class="hljs-keyword">private</span> String name;
<span class="hljs-keyword">private</span> String description;
<span class="hljs-keyword">private</span> Float size;
<span class="hljs-keyword">private</span> Float purchasePrice;
<span class="hljs-keyword">private</span> Float salesPrice;
<span class="hljs-comment">// JPA needs a default constructor</span>
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">Thing</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">Thing</span><span class="hljs-params">(UUID id, String name, String description, Float size, Float purchasePrice, Float salesPrice)</span> {
<span class="hljs-keyword">if</span> (id == <span class="hljs-literal">null</span> || name == <span class="hljs-literal">null</span> || description == <span class="hljs-literal">null</span> || purchasePrice == <span class="hljs-literal">null</span> || salesPrice == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Parameters cannot be null"</span>);
}
<span class="hljs-keyword">if</span> (name.isEmpty() || description.isEmpty() || size <= <span class="hljs-number">0</span> || purchasePrice <= <span class="hljs-number">0</span> || salesPrice <= <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Invalid values"</span>);
}
<span class="hljs-keyword">if</span> (salesPrice < purchasePrice) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Sales price cannot be lower than purchase price"</span>);
}
<span class="hljs-built_in">this</span>.id = id;
<span class="hljs-built_in">this</span>.name = name;
<span class="hljs-built_in">this</span>.description = description;
<span class="hljs-built_in">this</span>.size = size;
<span class="hljs-built_in">this</span>.purchasePrice = purchasePrice;
<span class="hljs-built_in">this</span>.salesPrice = salesPrice;
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getName</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> name;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getDescription</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> description;
}
<span class="hljs-keyword">public</span> Float <span class="hljs-title function_">getSize</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> size;
}
<span class="hljs-keyword">public</span> Float <span class="hljs-title function_">getPurchasePrice</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> purchasePrice;
}
<span class="hljs-keyword">public</span> Float <span class="hljs-title function_">getSalesPrice</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> salesPrice;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setName</span><span class="hljs-params">(String name)</span> {
<span class="hljs-built_in">this</span>.name = name;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setDescription</span><span class="hljs-params">(String description)</span> {
<span class="hljs-built_in">this</span>.description = description;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setSize</span><span class="hljs-params">(Float size)</span> {
<span class="hljs-built_in">this</span>.size = size;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setPurchasePrice</span><span class="hljs-params">(Float purchasePrice)</span> {
<span class="hljs-built_in">this</span>.purchasePrice = purchasePrice;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setSalesPrice</span><span class="hljs-params">(Float salesPrice)</span> {
<span class="hljs-built_in">this</span>.salesPrice = salesPrice;
}
}
</code></div></div></pre><p>This class represents the Thing entity and is mapped to a database table using JPA. It has fields for id, name, description, size, purchase price and sales price. The id is a UUID, and the others are as per your requirements.</p><p>The constructor checks all the fields for null values, and for some fields, it also checks for valid values (non-empty strings, size and prices greater than 0, and sales price not lower than purchase price). If any of these checks fail, it throws an IllegalArgumentException. This ensures that no Thing object with invalid state can be created.</p><p>The class also provides getters and setters for all the fields.</p><p>Please note that in a real-world project, you might want to avoid mutable objects and setters, and use constructor or builder pattern for creating objects instead. You might also want to use Java's Optional class for optional fields.</p><p>This class will be used by the service classes implementing the interfaces you provided, to create and manipulate Thing objects and to persist them to the database using Spring JPA.</p></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">Using the information from the three interfaces, please correctly and fully implement the Catalog class, so that it will work with the methods defined in the interfaces.</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>The Catalog class should represent the entity that holds the Thing and its stock quantity. Here's an implementation of the Catalog class:</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.Entity;
<span class="hljs-keyword">import</span> javax.persistence.Id;
<span class="hljs-keyword">import</span> javax.persistence.OneToOne;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">Catalog</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-keyword">private</span> UUID id; <span class="hljs-comment">// this id should be the same as the Thing id</span>
<span class="hljs-meta">@OneToOne</span>
<span class="hljs-keyword">private</span> Thing thing;
<span class="hljs-keyword">private</span> <span class="hljs-type">int</span> stockQuantity;
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">Catalog</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">Catalog</span><span class="hljs-params">(Thing thing, <span class="hljs-type">int</span> stockQuantity)</span> {
<span class="hljs-keyword">if</span> (thing == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Thing cannot be null"</span>);
}
<span class="hljs-keyword">if</span> (stockQuantity < <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Stock quantity cannot be negative"</span>);
}
<span class="hljs-built_in">this</span>.id = thing.getId();
<span class="hljs-built_in">this</span>.thing = thing;
<span class="hljs-built_in">this</span>.stockQuantity = stockQuantity;
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> Thing <span class="hljs-title function_">getThing</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> thing;
}
<span class="hljs-keyword">public</span> <span class="hljs-type">int</span> <span class="hljs-title function_">getStockQuantity</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> stockQuantity;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setThing</span><span class="hljs-params">(Thing thing)</span> {
<span class="hljs-built_in">this</span>.thing = thing;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setStockQuantity</span><span class="hljs-params">(<span class="hljs-type">int</span> stockQuantity)</span> {
<span class="hljs-built_in">this</span>.stockQuantity = stockQuantity;
}
<span class="hljs-comment">// Additional methods</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">addToStock</span><span class="hljs-params">(<span class="hljs-type">int</span> addedQuantity)</span> {
<span class="hljs-keyword">if</span> (addedQuantity < <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Added quantity cannot be negative"</span>);
}
<span class="hljs-built_in">this</span>.stockQuantity += addedQuantity;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">removeFromStock</span><span class="hljs-params">(<span class="hljs-type">int</span> removedQuantity)</span> {
<span class="hljs-keyword">if</span> (removedQuantity < <span class="hljs-number">0</span> || removedQuantity > stockQuantity) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Invalid removed quantity"</span>);
}
<span class="hljs-built_in">this</span>.stockQuantity -= removedQuantity;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">changeStockTo</span><span class="hljs-params">(<span class="hljs-type">int</span> newTotalQuantity)</span> {
<span class="hljs-keyword">if</span> (newTotalQuantity < <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"New total quantity cannot be negative"</span>);
}
<span class="hljs-built_in">this</span>.stockQuantity = newTotalQuantity;
}
}
</code></div></div></pre><p>The Catalog class includes a reference to a Thing object and an integer to keep track of the stock quantity.</p><p>The constructor checks that the Thing object is not null and the stock quantity is not negative.</p><p>The class also provides getters and setters for all the fields, and three additional methods: addToStock(), removeFromStock(), and changeStockTo(). These methods change the stock quantity and perform the necessary checks to ensure the stock quantity remains valid.</p><p>This class will be used by the service classes implementing the interfaces you provided, to manage the stock of Things and to persist these data to the database using Spring JPA.</p></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">Using the information from the three interfaces, please correctly and fully implement the Order class, so that it will work with the methods defined in the interfaces.</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>According to your requirements, an Order consists of several Order Positions. Each Order Position references a Thing and contains the quantity of the Thing that is ordered. Also, an Order should be associated with a Customer. Here's a possible implementation of the Order and OrderPosition classes:</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.*;
<span class="hljs-keyword">import</span> java.util.ArrayList;
<span class="hljs-keyword">import</span> java.util.List;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">Order</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-meta">@GeneratedValue</span>
<span class="hljs-keyword">private</span> UUID id;
<span class="hljs-meta">@ManyToOne</span>
<span class="hljs-keyword">private</span> Customer customer;
<span class="hljs-meta">@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)</span>
<span class="hljs-keyword">private</span> List<OrderPosition> orderPositions = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span><>();
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">Order</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">Order</span><span class="hljs-params">(Customer customer)</span> {
<span class="hljs-keyword">if</span> (customer == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Customer cannot be null"</span>);
}
<span class="hljs-built_in">this</span>.customer = customer;
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> Customer <span class="hljs-title function_">getCustomer</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> customer;
}
<span class="hljs-keyword">public</span> List<OrderPosition> <span class="hljs-title function_">getOrderPositions</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> orderPositions;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setCustomer</span><span class="hljs-params">(Customer customer)</span> {
<span class="hljs-built_in">this</span>.customer = customer;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setOrderPositions</span><span class="hljs-params">(List<OrderPosition> orderPositions)</span> {
<span class="hljs-built_in">this</span>.orderPositions = orderPositions;
}
<span class="hljs-comment">// Additional methods</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">addOrderPosition</span><span class="hljs-params">(OrderPosition orderPosition)</span> {
<span class="hljs-keyword">if</span> (orderPosition == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"OrderPosition cannot be null"</span>);
}
<span class="hljs-built_in">this</span>.orderPositions.add(orderPosition);
}
}
</code></div></div></pre><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.Entity;
<span class="hljs-keyword">import</span> javax.persistence.GeneratedValue;
<span class="hljs-keyword">import</span> javax.persistence.Id;
<span class="hljs-keyword">import</span> javax.persistence.ManyToOne;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">OrderPosition</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-meta">@GeneratedValue</span>
<span class="hljs-keyword">private</span> UUID id;
<span class="hljs-meta">@ManyToOne</span>
<span class="hljs-keyword">private</span> Thing thing;
<span class="hljs-keyword">private</span> <span class="hljs-type">int</span> quantity;
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">OrderPosition</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">OrderPosition</span><span class="hljs-params">(Thing thing, <span class="hljs-type">int</span> quantity)</span> {
<span class="hljs-keyword">if</span> (thing == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Thing cannot be null"</span>);
}
<span class="hljs-keyword">if</span> (quantity <= <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Quantity must be greater than 0"</span>);
}
<span class="hljs-built_in">this</span>.thing = thing;
<span class="hljs-built_in">this</span>.quantity = quantity;
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> Thing <span class="hljs-title function_">getThing</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> thing;
}
<span class="hljs-keyword">public</span> <span class="hljs-type">int</span> <span class="hljs-title function_">getQuantity</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> quantity;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setThing</span><span class="hljs-params">(Thing thing)</span> {
<span class="hljs-built_in">this</span>.thing = thing;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setQuantity</span><span class="hljs-params">(<span class="hljs-type">int</span> quantity)</span> {
<span class="hljs-built_in">this</span>.quantity = quantity;
}
}
</code></div></div></pre><p>The Order class holds a list of OrderPosition objects and a reference to the Customer who placed the order. The OrderPosition class holds a reference to a Thing and the quantity of the Thing that is ordered.</p><p>Each class has a constructor that checks for invalid inputs, getters and setters for all the fields, and additional methods as needed. The addOrderPosition() method in the Order class allows adding a new OrderPosition to an Order. The OrderPosition class has a constructor that validates the Thing and quantity.</p><p>These classes will be used by the service classes implementing the interfaces you provided, to manage the orders and to persist these data to the database using Spring JPA.</p></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">Using the information from the three interfaces, please correctly and fully implement the ShoppingBasket class, so that it will work with the methods defined in the interfaces.</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>According to your requirements, the ShoppingBasket can be seen as a special type of Order where the Customer hasn't checked out yet. It consists of several OrderPositions, just like an Order. Each OrderPosition references a Thing and contains the quantity of the Thing that is added to the basket. Also, a ShoppingBasket should be associated with a Customer. Here's a possible implementation of the ShoppingBasket and BasketPosition classes:</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.*;
<span class="hljs-keyword">import</span> java.util.ArrayList;
<span class="hljs-keyword">import</span> java.util.List;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">ShoppingBasket</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-meta">@GeneratedValue</span>
<span class="hljs-keyword">private</span> UUID id;
<span class="hljs-meta">@OneToOne</span>
<span class="hljs-keyword">private</span> Customer customer;
<span class="hljs-meta">@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)</span>
<span class="hljs-keyword">private</span> List<BasketPosition> basketPositions = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span><>();
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">ShoppingBasket</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">ShoppingBasket</span><span class="hljs-params">(Customer customer)</span> {
<span class="hljs-keyword">if</span> (customer == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Customer cannot be null"</span>);
}
<span class="hljs-built_in">this</span>.customer = customer;
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> Customer <span class="hljs-title function_">getCustomer</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> customer;
}
<span class="hljs-keyword">public</span> List<BasketPosition> <span class="hljs-title function_">getBasketPositions</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> basketPositions;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setCustomer</span><span class="hljs-params">(Customer customer)</span> {
<span class="hljs-built_in">this</span>.customer = customer;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setBasketPositions</span><span class="hljs-params">(List<BasketPosition> basketPositions)</span> {
<span class="hljs-built_in">this</span>.basketPositions = basketPositions;
}
<span class="hljs-comment">// Additional methods</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">addBasketPosition</span><span class="hljs-params">(BasketPosition basketPosition)</span> {
<span class="hljs-keyword">if</span> (basketPosition == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"BasketPosition cannot be null"</span>);
}
<span class="hljs-built_in">this</span>.basketPositions.add(basketPosition);
}
}
</code></div></div></pre><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.Entity;
<span class="hljs-keyword">import</span> javax.persistence.GeneratedValue;
<span class="hljs-keyword">import</span> javax.persistence.Id;
<span class="hljs-keyword">import</span> javax.persistence.ManyToOne;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">BasketPosition</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-meta">@GeneratedValue</span>
<span class="hljs-keyword">private</span> UUID id;
<span class="hljs-meta">@ManyToOne</span>
<span class="hljs-keyword">private</span> Thing thing;
<span class="hljs-keyword">private</span> <span class="hljs-type">int</span> quantity;
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">BasketPosition</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">BasketPosition</span><span class="hljs-params">(Thing thing, <span class="hljs-type">int</span> quantity)</span> {
<span class="hljs-keyword">if</span> (thing == <span class="hljs-literal">null</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Thing cannot be null"</span>);
}
<span class="hljs-keyword">if</span> (quantity <= <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Quantity must be greater than 0"</span>);
}
<span class="hljs-built_in">this</span>.thing = thing;
<span class="hljs-built_in">this</span>.quantity = quantity;
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> Thing <span class="hljs-title function_">getThing</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> thing;
}
<span class="hljs-keyword">public</span> <span class="hljs-type">int</span> <span class="hljs-title function_">getQuantity</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> quantity;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setThing</span><span class="hljs-params">(Thing thing)</span> {
<span class="hljs-built_in">this</span>.thing = thing;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setQuantity</span><span class="hljs-params">(<span class="hljs-type">int</span> quantity)</span> {
<span class="hljs-built_in">this</span>.quantity = quantity;
}
}
</code></div></div></pre><p>The ShoppingBasket class holds a list of BasketPosition objects and a reference to the Customer who owns the basket. The BasketPosition class holds a reference to a Thing and the quantity of the Thing that is added to the basket.</p><p>Each class has a constructor that checks for invalid inputs, getters and setters for all the fields, and additional methods as needed. The addBasketPosition() method in the ShoppingBasket class allows adding a new BasketPosition to a ShoppingBasket. The BasketPosition class has a constructor that validates the Thing and quantity.</p><p>These classes will be used by the service classes implementing the interfaces you provided, to manage the shopping baskets and to persist</p></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">Using the information from the three interfaces, please correctly and fully implement the Customer class, so that it will work with the methods defined in the interfaces.</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>Given the provided interfaces and requirements, the Customer class should have fields to store the customer's name, mail address, and physical address. It should also have a reference to the ShoppingBasket to represent the customer's current shopping basket. Here's a possible implementation:</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.domain;
<span class="hljs-keyword">import</span> javax.persistence.*;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Entity</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">Customer</span> {
<span class="hljs-meta">@Id</span>
<span class="hljs-meta">@GeneratedValue</span>
<span class="hljs-keyword">private</span> UUID id;
<span class="hljs-keyword">private</span> String name;
<span class="hljs-meta">@Column(unique = true)</span>
<span class="hljs-keyword">private</span> String mailAddress;
<span class="hljs-keyword">private</span> String street;
<span class="hljs-keyword">private</span> String city;
<span class="hljs-keyword">private</span> String postalCode;
<span class="hljs-meta">@OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)</span>
<span class="hljs-keyword">private</span> ShoppingBasket shoppingBasket;
<span class="hljs-keyword">protected</span> <span class="hljs-title function_">Customer</span><span class="hljs-params">()</span> {}
<span class="hljs-keyword">public</span> <span class="hljs-title function_">Customer</span><span class="hljs-params">(String name, String mailAddress, String street, String city, String postalCode)</span> {
<span class="hljs-keyword">if</span> (name == <span class="hljs-literal">null</span> || name.isEmpty()) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Name cannot be null or empty"</span>);
}
<span class="hljs-keyword">if</span> (mailAddress == <span class="hljs-literal">null</span> || mailAddress.isEmpty()) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"Mail address cannot be null or empty"</span>);
}
<span class="hljs-built_in">this</span>.name = name;
<span class="hljs-built_in">this</span>.mailAddress = mailAddress;
<span class="hljs-built_in">this</span>.street = street;
<span class="hljs-built_in">this</span>.city = city;
<span class="hljs-built_in">this</span>.postalCode = postalCode;
<span class="hljs-built_in">this</span>.shoppingBasket = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ShoppingBasket</span>(<span class="hljs-built_in">this</span>);
}
<span class="hljs-comment">// Getters and setters</span>
<span class="hljs-keyword">public</span> UUID <span class="hljs-title function_">getId</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> id;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getName</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> name;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getMailAddress</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> mailAddress;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getStreet</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> street;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getCity</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> city;
}
<span class="hljs-keyword">public</span> String <span class="hljs-title function_">getPostalCode</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> postalCode;
}
<span class="hljs-keyword">public</span> ShoppingBasket <span class="hljs-title function_">getShoppingBasket</span><span class="hljs-params">()</span> {
<span class="hljs-keyword">return</span> shoppingBasket;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setId</span><span class="hljs-params">(UUID id)</span> {
<span class="hljs-built_in">this</span>.id = id;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setName</span><span class="hljs-params">(String name)</span> {
<span class="hljs-built_in">this</span>.name = name;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setMailAddress</span><span class="hljs-params">(String mailAddress)</span> {
<span class="hljs-built_in">this</span>.mailAddress = mailAddress;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setStreet</span><span class="hljs-params">(String street)</span> {
<span class="hljs-built_in">this</span>.street = street;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setCity</span><span class="hljs-params">(String city)</span> {
<span class="hljs-built_in">this</span>.city = city;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setPostalCode</span><span class="hljs-params">(String postalCode)</span> {
<span class="hljs-built_in">this</span>.postalCode = postalCode;
}
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">setShoppingBasket</span><span class="hljs-params">(ShoppingBasket shoppingBasket)</span> {
<span class="hljs-built_in">this</span>.shoppingBasket = shoppingBasket;
}
}
</code></div></div></pre><p>In this implementation, the Customer class has a constructor that checks for invalid inputs (like null or empty name and mail address), getters and setters for all the fields, and creates a new ShoppingBasket for each new Customer.</p><p>The service classes implementing the provided interfaces will use the Customer class to manage customers and their shopping baskets, and to persist customer data using Spring JPA.</p></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">Please write a class to implement the following interface. Please remember how you wrote the Thing, Catalog and other classes, when writing this new class.
package thkoeln.archilab.ecommerce.usecases;
import java.util.UUID;
/**
* This interface contains methods needed in the context of use cases dealing with managing the thing catalog.
* The interface is probably incomplete, and will grow over time.
*/
public interface ThingCatalogUseCases {
/**
* Adds a new thing to the shop catalog
* @param thingId
* @param name
* @param description
* @param size
* @param purchasePrice
* @param salesPrice
* @throws ShopException if ...
* - the thing id already exists,
* - name or description are null or empty,
* - the size is <= 0 (but can be null!),
* - the purchase price is null or <= 0,
* - the sales price is null or <= 0,
* - the sales price is lower than the purchase price
*/
public void addThingToCatalog( UUID thingId, String name, String description, Float size,
Float purchasePrice, Float salesPrice );
/**
* Removes a thing from the shop catalog
* @param thingId
* @throws ShopException if
* - the thing id does not exist
* - the thing is still in stock
* - the thing is still reserved in a shopping basket, or part of a completed order
*/
public void removeThingFromCatalog( UUID thingId );
/**
* Get the sales price of a given thing
* @param thingId
* @return the sales price
* @throws ShopException if the thing id does not exist
*/
public Float getSalesPrice( UUID thingId );
/**
* Clears the thing catalog, i.e. removes all things from the catalog, including all the stock,
* all the reservations and all the orders.
*/
public void deleteThingCatalog();
}
</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>Here is a possible implementation of the <code>ThingCatalogUseCases</code> interface. Note that this class would rely on some external services or repositories that would provide the data access and other business logic not directly related to managing the catalog.</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.services;
<span class="hljs-keyword">import</span> org.springframework.beans.factory.annotation.Autowired;
<span class="hljs-keyword">import</span> org.springframework.stereotype.Service;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.domain.Catalog;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.domain.Thing;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.repositories.CatalogRepository;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.repositories.ThingRepository;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.usecases.ShopException;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.usecases.ThingCatalogUseCases;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Service</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">CatalogService</span> <span class="hljs-keyword">implements</span> <span class="hljs-title class_">ThingCatalogUseCases</span> {
<span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> CatalogRepository catalogRepository;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> ThingRepository thingRepository;
<span class="hljs-meta">@Autowired</span>
<span class="hljs-keyword">public</span> <span class="hljs-title function_">CatalogService</span><span class="hljs-params">(CatalogRepository catalogRepository, ThingRepository thingRepository)</span> {
<span class="hljs-built_in">this</span>.catalogRepository = catalogRepository;
<span class="hljs-built_in">this</span>.thingRepository = thingRepository;
}
<span class="hljs-meta">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">addThingToCatalog</span><span class="hljs-params">(UUID thingId, String name, String description, Float size, Float purchasePrice, Float salesPrice)</span> {
<span class="hljs-keyword">if</span>(thingRepository.findById(thingId).isPresent()){
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">ShopException</span>(<span class="hljs-string">"The thing id already exists"</span>);
}
<span class="hljs-type">Thing</span> <span class="hljs-variable">thing</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Thing</span>(thingId, name, description, size, purchasePrice, salesPrice);
<span class="hljs-type">Catalog</span> <span class="hljs-variable">catalog</span> <span class="hljs-operator">=</span> catalogRepository.findAll().get(<span class="hljs-number">0</span>);
catalog.addThing(thing);
catalogRepository.save(catalog);
}
<span class="hljs-meta">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">removeThingFromCatalog</span><span class="hljs-params">(UUID thingId)</span> {
<span class="hljs-type">Thing</span> <span class="hljs-variable">thing</span> <span class="hljs-operator">=</span> thingRepository.findById(thingId)
.orElseThrow(() -> <span class="hljs-keyword">new</span> <span class="hljs-title class_">ShopException</span>(<span class="hljs-string">"The thing id does not exist"</span>));
<span class="hljs-type">Catalog</span> <span class="hljs-variable">catalog</span> <span class="hljs-operator">=</span> catalogRepository.findAll().get(<span class="hljs-number">0</span>);
catalog.removeThing(thing);
catalogRepository.save(catalog);
}
<span class="hljs-meta">@Override</span>
<span class="hljs-keyword">public</span> Float <span class="hljs-title function_">getSalesPrice</span><span class="hljs-params">(UUID thingId)</span> {
<span class="hljs-type">Thing</span> <span class="hljs-variable">thing</span> <span class="hljs-operator">=</span> thingRepository.findById(thingId)
.orElseThrow(() -> <span class="hljs-keyword">new</span> <span class="hljs-title class_">ShopException</span>(<span class="hljs-string">"The thing id does not exist"</span>));
<span class="hljs-keyword">return</span> thing.getSalesPrice();
}
<span class="hljs-meta">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">deleteThingCatalog</span><span class="hljs-params">()</span> {
<span class="hljs-type">Catalog</span> <span class="hljs-variable">catalog</span> <span class="hljs-operator">=</span> catalogRepository.findAll().get(<span class="hljs-number">0</span>);
catalog.clearCatalog();
catalogRepository.save(catalog);
}
}
</code></div></div></pre><p>In this example, we've created a <code>CatalogService</code> class that implements the <code>ThingCatalogUseCases</code> interface. The class uses <code>CatalogRepository</code> and <code>ThingRepository</code> to interact with the database.</p><p>Note: The repositories (CatalogRepository and ThingRepository) are not provided in your code. These repositories are used to access data from your database using Spring Data JPA. Also, the exception handling here is rather straightforward, you would want to create more sophisticated exception handling in a real-world application.</p></div></div></div><div class="flex justify-between lg:block"><div class="text-gray-400 flex self-end lg:self-center justify-center mt-2 gap-2 md:gap-3 lg:gap-1 lg:absolute lg:top-0 lg:translate-x-full lg:right-0 lg:mt-0 lg:pl-2 visible"></div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 dark:bg-gray-800"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words">Please write a class to implement the following interface. Please remember how you wrote the Thing, Catalog and other classes, when writing this new class.
package thkoeln.archilab.ecommerce.usecases;
import java.util.UUID;
/**
* This interface contains methods needed in the context of use cases dealing with managing the shop stock,
* i.e. adding and removing things in the warehouse. The interface is probably incomplete, and
* will grow over time.
*/
public interface StockManagementUseCases {
/**
* Adds a certain quantity of a given thing to the stock
* @param thingId
* @param addedQuantity
* @throws ShopException if the thing id does not exist, or if the added quantity is negative
*/
public void addToStock( UUID thingId, int addedQuantity );
/**
* Removes a certain quantity of a given thing from the stock.
* If the new total quantity is lower than the currently reserved things, some of currently reserved things
* (in the customers' shopping baskets) are removed. This means that some of the reserved things are lost for
* the customer. (This is necessary because there probably was a mistake in the stock management, a mis-counting,
* or some of the things were stolen from the warehouse, are broken, etc.)
* @param thingId
* @param removedQuantity
* @throws ShopException if ...
* - the thing id does not exist
* - if the removed quantity is negative
* - if the removed quantity is greater than the current stock and the currently reserved things together
*/
public void removeFromStock( UUID thingId, int removedQuantity );
/**
* Changes the total quantity of a given thing in the stock.
* If the new total quantity is lower than the currently reserved things, some of currently reserved things
* (in the customers' shopping baskets) are removed. This means that some of the reserved things are lost for
* the customer. (This is necessary because there probably was a mistake in the stock management, a mis-counting,
* or some of the things were stolen from the warehouse, are broken, etc.)
* @param thingId
* @param newTotalQuantity
* @throws ShopException if ...
* - the thing id does not exist
* - if the new total quantity is negative
*/
public void changeStockTo( UUID thingId, int newTotalQuantity );
/**
* Get the current total stock of a given thing, including the currently reserved things
* @param thingId
* @throws ShopException if the thing id does not exist
*/
public int getAvailableStock( UUID thingId );
}</div></div></div></div></div><div class="group w-full text-gray-800 dark:text-gray-100 border-b border-black/10 dark:border-gray-900/50 bg-gray-50 dark:bg-[#444654]"><div class="flex p-4 gap-4 text-base md:gap-6 md:max-w-2xl lg:max-w-xl xl:max-w-3xl md:py-6 lg:px-0 m-auto"><div class="relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]"><div class="flex flex-grow flex-col gap-3"><div class="min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap break-words"><div class="markdown prose w-full break-words dark:prose-invert light"><p>Here is a possible implementation of the <code>StockManagementUseCases</code> interface. This class would rely on some external services or repositories that would provide the data access and other business logic not directly related to managing the stock.</p><pre><div class="bg-black rounded-md mb-4"><div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md"><span>java</span></div><div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-java"><span class="hljs-keyword">package</span> thkoeln.archilab.ecommerce.solution.services;
<span class="hljs-keyword">import</span> org.springframework.beans.factory.annotation.Autowired;
<span class="hljs-keyword">import</span> org.springframework.stereotype.Service;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.domain.Catalog;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.domain.Thing;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.repositories.CatalogRepository;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.solution.repositories.ThingRepository;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.usecases.ShopException;
<span class="hljs-keyword">import</span> thkoeln.archilab.ecommerce.usecases.StockManagementUseCases;
<span class="hljs-keyword">import</span> java.util.UUID;
<span class="hljs-meta">@Service</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">StockManagementService</span> <span class="hljs-keyword">implements</span> <span class="hljs-title class_">StockManagementUseCases</span> {
<span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> CatalogRepository catalogRepository;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> ThingRepository thingRepository;
<span class="hljs-meta">@Autowired</span>
<span class="hljs-keyword">public</span> <span class="hljs-title function_">StockManagementService</span><span class="hljs-params">(CatalogRepository catalogRepository, ThingRepository thingRepository)</span> {
<span class="hljs-built_in">this</span>.catalogRepository = catalogRepository;
<span class="hljs-built_in">this</span>.thingRepository = thingRepository;
}
<span class="hljs-meta">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">addToStock</span><span class="hljs-params">(UUID thingId, <span class="hljs-type">int</span> addedQuantity)</span> {
<span class="hljs-type">Thing</span> <span class="hljs-variable">thing</span> <span class="hljs-operator">=</span> thingRepository.findById(thingId)
.orElseThrow(() -> <span class="hljs-keyword">new</span> <span class="hljs-title class_">ShopException</span>(<span class="hljs-string">"The thing id does not exist"</span>));