lecture1: Solved an excersise

src/main/java/com/rxmobileteam/lecture1/Exercise1Main.java

@@ -4,6 +4,8 @@
 import com.rxmobileteam.lecture1.service.Product;
 import com.rxmobileteam.lecture1.service.ProductService;
 
+import java.util.stream.Collectors;
+
 public class Exercise1Main {
     public static void main(String[] args) {
         ProductService productService = new ProductServiceFactory().createProductService();
@@ -47,14 +49,15 @@ public static void main(String[] args) {
         productService.addProduct(samsungGalaxyS21);
         productService.addProduct(samsungGalaxyS21Ultra);
 
-        System.out.println("Search for 'Samsung':");
+        String query = "Samsung";
+        System.out.printf("Search for %s: \n", query);
+        System.out.print("Result: ");
+        System.out.println(productService.searchProducts(query).size());
         System.out.println(
             String.join(
                 "\n",
-                productService.searchProducts("Samsung")
-                    .stream()
-                    .map(Product::toString)
-                    .toList()
+                productService.searchProducts(query)
+                    .stream().map(Product::toString).collect(Collectors.toSet())
             )
         );
     }

src/main/java/com/rxmobileteam/lecture1/data/ProductDao.java

@@ -6,6 +6,7 @@
 
 import java.util.HashSet;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 /**
  * {@link ProductDao} represents a Data Access Object (DAO) for products.
@@ -24,8 +25,7 @@ public class ProductDao {
      * @return {@code true} if a product was stored, {@code false} otherwise
      */
     public boolean add(@NotNull Product product) {
-        // TODO: implement this method
-        throw new ExerciseNotCompletedException();
+        return products.add(product);
     }
 
     /**
@@ -35,8 +35,6 @@ public boolean add(@NotNull Product product) {
      */
     @NotNull
     public Set<Product> findAll() {
-        // TODO: implement this method
-        throw new ExerciseNotCompletedException();
+        return new HashSet<>(products);
     }
-
 }

src/main/java/com/rxmobileteam/lecture1/factory/ProductServiceFactory.java

@@ -1,5 +1,6 @@
 package com.rxmobileteam.lecture1.factory;
 
+import com.rxmobileteam.lecture1.data.ProductDao;
 import com.rxmobileteam.lecture1.service.ProductService;
 import com.rxmobileteam.utils.ExerciseNotCompletedException;
 import org.jetbrains.annotations.NotNull;
@@ -18,7 +19,8 @@ public class ProductServiceFactory {
      */
     @NotNull
     public ProductService createProductService() {
-        // TODO: implement this method
-        throw new ExerciseNotCompletedException();
+        ProductDao productDao = new ProductDao();
+
+        return new ProductService(productDao);
     }
 }

src/main/java/com/rxmobileteam/lecture1/service/Product.java

@@ -55,4 +55,20 @@ public String toString() {
             ", price=" + price +
             '}';
     }
+
+    public @NotNull String getId() {
+        return id;
+    }
+
+    public @NotNull String getName() {
+        return name;
+    }
+
+    public @NotNull String getDescription() {
+        return description;
+    }
+
+    public double getPrice() {
+        return price;
+    }
 }

src/main/java/com/rxmobileteam/lecture1/service/ProductService.java

@@ -1,10 +1,11 @@
 package com.rxmobileteam.lecture1.service;
 
 import com.rxmobileteam.lecture1.data.ProductDao;
-import com.rxmobileteam.utils.ExerciseNotCompletedException;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
 
 /**
  * {@link ProductService} provides an API that allows to manage {@link Product}s.
@@ -13,6 +14,11 @@
  * TODO: 2. Using {@link ProductDao} implement method {@link ProductService#searchProducts(String)}
  */
 public class ProductService {
+    private final ProductDao productDao;
+
+    public ProductService(ProductDao productDao) {
+        this.productDao = productDao;
+    }
 
     /**
      * Adds a new product to the system.
@@ -21,8 +27,7 @@ public class ProductService {
      * @return {@code true} if a product was added, {@code false} otherwise.
      */
     public boolean addProduct(@NotNull Product product) {
-        // TODO: implement this method
-        throw new ExerciseNotCompletedException();
+        return productDao.add(product);
     }
 
     /**
@@ -33,7 +38,10 @@ public boolean addProduct(@NotNull Product product) {
      */
     @NotNull
     public List<Product> searchProducts(@NotNull String query) {
-        // TODO: implement this method
-        throw new ExerciseNotCompletedException();
+        String queryLowerCase = query.toLowerCase();
+        Set<Product> products = productDao.findAll();
+
+        return products.stream().filter(product -> product.
+            getName().toLowerCase().contains(queryLowerCase)).collect(Collectors.toList());
     }
 }

src/main/java/com/rxmobileteam/lecture2_3/delegated_properties/exercise.kt

@@ -3,7 +3,6 @@ package com.rxmobileteam.lecture2_3.delegated_properties
 import com.rxmobileteam.lecture2_3.delegated_properties.StringOperationDelegates.capitalized
 import com.rxmobileteam.lecture2_3.delegated_properties.StringOperationDelegates.trimmed
 import com.rxmobileteam.lecture2_3.delegated_properties.StringOperationDelegates.uppercase
-import com.rxmobileteam.utils.ExerciseNotCompletedException
 import java.util.*
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
@@ -16,14 +15,17 @@ object StringOperationDelegates {
   fun uppercase(initial: String, locale: Locale = Locale.ROOT): ReadWriteProperty<Any?, String> =
     // TODO: Implement the delegate. Note: avoid unnecessary operations/computations as much as possible
     object : ReadWriteProperty<Any?, String> {
-      private var uppercaseValue: String = throw ExerciseNotCompletedException()
+      private var uppercaseValue: String = initial.uppercase(locale)
 
       // TODO: Implement the getValue
-      override fun getValue(thisRef: Any?, property: KProperty<*>): String = throw ExerciseNotCompletedException()
+      override
+
+      fun getValue(thisRef: Any?, property: KProperty<*>): String = uppercaseValue
+
 
       // TODO: Implement the setValue
       override fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
-        throw ExerciseNotCompletedException()
+        uppercaseValue = value.uppercase()
       }
     }
 
@@ -33,14 +35,14 @@ object StringOperationDelegates {
   fun trimmed(initial: String): ReadWriteProperty<Any?, String> =
     // TODO: Implement the delegate. Note: avoid unnecessary operations/computations as much as possible
     object : ReadWriteProperty<Any?, String> {
-      private var trimmedValue: String = throw ExerciseNotCompletedException()
+      private var trimmedValue: String = initial.trim()
 
       // TODO: Implement the getValue
-      override fun getValue(thisRef: Any?, property: KProperty<*>): String = throw ExerciseNotCompletedException()
+      override fun getValue(thisRef: Any?, property: KProperty<*>): String = trimmedValue
 
       // TODO: Implement the setValue
       override fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
-        throw ExerciseNotCompletedException()
+        trimmedValue = value.trim()
       }
     }
 
@@ -50,14 +52,15 @@ object StringOperationDelegates {
   fun capitalized(initial: String): ReadWriteProperty<Any?, String> =
     // TODO: Implement the delegate. Note: avoid unnecessary operations/computations as much as possible
     object : ReadWriteProperty<Any?, String> {
-      private var value: String = throw ExerciseNotCompletedException()
+      private var value: String =
+        initial.replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.getDefault()) else it.toString() }
 
       // TODO: Implement the getValue
-      override fun getValue(thisRef: Any?, property: KProperty<*>): String = throw ExerciseNotCompletedException()
+      override fun getValue(thisRef: Any?, property: KProperty<*>): String = value
 
       // TODO: Implement the setValue
       override fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
-        throw ExerciseNotCompletedException()
+        this.value = value.replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }
       }
     }
 }