Why Unstructured Data is a Good Fit for Java

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public class Customer {
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    private String id;
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    private String name;
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    private String email;
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    // Constructors, getters, and setters
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}

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public class CustomerRepository {
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    private MongoCollection<Document> collection;
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    public CustomerRepository() {
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        MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
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        this.collection = mongoClient.getDatabase("mydatabase").getCollection("customers");
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    }
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    public void addCustomer(Customer customer) {
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        Document doc = new Document("id", customer.getId())
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                            .append("name", customer.getName())
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                            .append("email", customer.getEmail());
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        collection.insertOne(doc);
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    }
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}

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public class Customer {
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    private String id;
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    private String name;
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    private String email;
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    private List<String> Orders;
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    // Constructors, getters, and setters
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}

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Customer customer = customerCollection.find(Filters.eq("_id", "customerId")).first();
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if (customer != null) {
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    List&<Order> orders = orderCollection.find(Filters.in("_id", customer.getOrders())).into(new ArrayList<>());
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    orders.forEach(order -> System.out.println(order.getProductName()));
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} else {
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    System.out.println("Customer not found");
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}

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{
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  "_id": {"$oid": "66cc68309ff045b1b411b6ba"},
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  "productName": "Wireless Mouse",
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  "category": "Electronics",
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  "price": 29.99,
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  "stock": 150,
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  "description": "Ergonomic wireless mouse with adjustable DPI settings.",
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  "brand": "TechBrand",
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  "images": [
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    {
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      "url": "https://example.com/images/wireless_mouse_1.jpg",
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      "altText": "Wireless Mouse Top View"
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    },
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    {
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      "url": "https://example.com/images/wireless_mouse_2.jpg",
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      "altText": "Wireless Mouse Side View"
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    }
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  ],
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  "features": "2.4 GHz wireless connectivity, Adjustable DPI from 800 to 1600, Compatible with Windows and macOS",
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  "reviews": [
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    {
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      "customerId": {"$oid": "66cc67443921db64869bcf3d"},
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     "rating": 4.5,
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      "comment": "Great mouse, very comfortable to use!",
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      "date": "2023-03-01T08:45:00Z"
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    }
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  ]
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}

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public static void main(String[] args) {
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   ConnectionString connectionString = new ConnectionString(System.getenv("mongodb.uri"));
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   CodecRegistry pojoCodecRegistry = fromProviders(PojoCodecProvider.builder().automatic(true).build());
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   CodecRegistry codecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(), pojoCodecRegistry);
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   MongoClientSettings clientSettings = MongoClientSettings.builder()
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           .applyConnectionString(connectionString)
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           .codecRegistry(codecRegistry)
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           .build();
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   try (MongoClient mongoClient = MongoClients.create(clientSettings)) {
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       MongoDatabase database = mongoClient.getDatabase("ecommerce");
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       MongoCollection<Product> collection = database.getCollection("productDetails", Product.class);
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       Product newProduct = new Product();
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       newProduct.setId(new ObjectId());
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       newProduct.setProductName("Wireless Mouse");
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       newProduct.setCategory("Electronics");
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       newProduct.setPrice(29.99);
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       newProduct.setStock(150);
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       newProduct.setDescription("Ergonomic wireless mouse with adjustable DPI settings.");
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       newProduct.setBrand("TechBrand");
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       newProduct.setFeatures("2.4 GHz wireless connectivity, Adjustable DPI from 800 to 1600, Compatible with Windows and macOS");
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       List<Image> images = new ArrayList<>();
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       images.add(new Image("https://example.com/images/wireless_mouse_1.jpg", "Wireless Mouse Top View"));
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       images.add(new Image("https://example.com/images/wireless_mouse_2.jpg", "Wireless Mouse Side View"));
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       newProduct.setImages(images);
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       List<Reviews> reviews = new ArrayList<>();
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       reviews.add(new Reviews(new ObjectId("66cc67443921db64869bcf3d"), 4.5, "Great mouse, very comfortable to use!", "2024-08-18T19:00:00Z"));
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       newProduct.setReviews(reviews);
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       collection.insertOne(newProduct);
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       System.out.println("Inserted product: " + newProduct);
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       Product foundProduct = collection.find(Filters.eq("productName", "Wireless Mouse")).first();
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       System.out.println("Found product: " + foundProduct);
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       collection.updateOne(Filters.eq("_id", newProduct.getId()), Updates.set("stock", 140));
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       Product updatedProduct = collection.find(Filters.eq("_id", newProduct.getId())).first();
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       System.out.println("Updated product stock: " + updatedProduct.getStock());
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       collection.deleteOne(Filters.eq("_id", newProduct.getId()));
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       System.out.println("Deleted product: " + newProduct.getProductName());
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   }
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}

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private static void runAverageRatingPipeline(MongoCollection<Product> collection) {
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   AggregateIterable<Product> result = collection.aggregate(Arrays.asList(
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           unwind("$reviews"),
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           group("$_id",
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                   avg("averageRating", "$reviews.rating"),
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                   first("productName", "$productName"),
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                   first("category", "$category"),
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                   first("price", "$price"),
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                   first("brand", "$brand"),
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                   first("stock", "$stock")
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           ),
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           match(gte("averageRating", 4.5)),
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           sort(Sorts.descending("averageRating")),
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           project(fields(
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                   excludeId(),
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                   include("productName", "category", "price", "brand", "stock")
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           )),
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           limit(3)
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           )
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   );
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   System.out.println("High-Rated Products:");
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   for (Product doc : result) {
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       System.out.println(doc.toProductDetails());
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   }
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}

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private static void updateLowStockProducts(MongoCollection<Product> collection) {
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   collection.updateMany(
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           lt("stock", 50),
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           Updates.inc("stock", 20)
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   );
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   System.out.println("Update: Increased stock for products with less than 50 units.");
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}