Lab-2: implement class generator

.github/workflows/java.yml

@@ -0,0 +1,25 @@
+name: Build Java
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+      - name: Validate Gradle wrapper
+        uses: gradle/actions/wrapper-validation@v5
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+      - name: Build with Gradle
+        run: ./gradlew build

README.md

@@ -1,3 +1,4 @@
+[![Review Assignment Due Date](https://classroom.github.com/assets/deadline-readme-button-22041afd0340ce965d47ae6ef1cefeee28c7c493a6346c4f15d667ab976d596c.svg)](https://classroom.github.com/a/4ISSpVK4)
 **Java reflection** 
 
 Ваша задача --- написать генератор экземпляров произвольных классов.

annotation-processor/build.gradle.kts

@@ -0,0 +1,14 @@
+plugins {
+    id("java")
+}
+
+group = "org.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation(project(":core"))
+}

annotation-processor/src/main/java/org/example/annotation/processor/GeneratableProcessor.java

@@ -0,0 +1,95 @@
+package org.example.annotation.processor;
+
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.Writer;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.annotation.processing.SupportedSourceVersion;
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ElementKind;
+import javax.lang.model.element.TypeElement;
+import javax.tools.Diagnostic;
+import javax.tools.JavaFileObject;
+
+import org.example.annotation.Generatable;
+
+@SupportedSourceVersion(SourceVersion.RELEASE_21)
+@SupportedAnnotationTypes("org.example.annotation.Generatable")
+public class GeneratableProcessor extends AbstractProcessor {
+    private boolean hasGenerated = false;
+
+    @Override
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        if (hasGenerated || roundEnv.processingOver()) {
+            return true;
+        }
+
+        var annotatedElements = roundEnv.getElementsAnnotatedWith(Generatable.class);
+
+        var typeElements = annotatedElements.stream()
+                .map(this::getTypeElement)
+                .filter(Objects::nonNull)
+                .toList();
+
+        if (!typeElements.isEmpty()) {
+            generateGeneratableRegistry(typeElements);
+            hasGenerated = true;
+        }
+
+        return true;
+    }
+
+    private TypeElement getTypeElement(Element element) {
+        return (element.getKind() == ElementKind.CLASS) ? (TypeElement) element : null;
+    }
+
+    /**
+     * При процессинге аннотации {@link Generatable} "кэшируем" классы, которые её используют,
+     * для дальнейшего поиска при генерации производных классов, реализующих интерфейсы
+     */
+    private void generateGeneratableRegistry(List<TypeElement> typeElements) {
+        try {
+            JavaFileObject file = processingEnv.getFiler()
+                    .createSourceFile("org.example.generator.GeneratableRegistry");
+
+            try (Writer writer = new BufferedWriter(file.openWriter())) {
+                writer.write("package org.example.generator;\n\n");
+                writer.write("import java.util.List;\n\n");
+                writer.write("// Auto-generated by GeneratableProcessor. Don't modify this code!\n");
+                writer.write("public class GeneratableRegistry {\n");
+                writer.write("    public static List<Class<?>> getAllGeneratableClasses() {\n");
+                writer.write("        return List.of(\n");
+
+                for (int i = 0; i < typeElements.size(); i++) {
+                    writer.write("            " + typeElements.get(i).getQualifiedName().toString() + ".class");
+                    if (i < typeElements.size() - 1) {
+                        writer.write(",\n");
+                    } else {
+                        writer.write("\n");
+                    }
+                }
+
+                writer.write("        );\n");
+                writer.write("    }\n");
+                writer.write("}\n");
+            }
+
+            processingEnv.getMessager().printMessage(
+                    Diagnostic.Kind.NOTE,
+                    "Successfully generated GeneratableRegistry with " + typeElements.size() + " classes"
+            );
+        } catch (IOException e) {
+            processingEnv.getMessager().printMessage(
+                    Diagnostic.Kind.ERROR,
+                    "Failed to generate registry: " + e.getMessage()
+            );
+        }
+    }
+}

annotation-processor/src/main/resources/META-INF/services/javax.annotation.processing.Processor

@@ -0,0 +1 @@
+org.example.annotation.processor.GeneratableProcessor

build.gradle.kts

@@ -10,6 +10,9 @@ repositories {
 }
 
 dependencies {
+    implementation(project(":core"))
+    annotationProcessor(project(":annotation-processor"))
+
     testImplementation(platform("org.junit:junit-bom:5.10.0"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")

core/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    id("java")
+}
+
+group = "org.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+}

core/src/main/java/org/example/annotation/Generatable.java

@@ -0,0 +1,13 @@
+package org.example.annotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Generatable {
+}

settings.gradle.kts

@@ -1 +1,3 @@
-rootProject.name = "reflection-template"
+rootProject.name = "reflection-template"
+include("annotation-processor")
+include("core")

src/main/java/org/example/GenerateExample.java

@@ -1,12 +1,19 @@
 package org.example;
 
 
+import java.util.List;
+import java.util.Random;
+
 import org.example.classes.Example;
 import org.example.generator.Generator;
+import org.example.generator.PrimitiveValueGenerator;
+import org.example.generator.StringValueGenerator;
 
 public class GenerateExample {
     public static void main(String[] args) {
-        var gen = new Generator();
+        var random = new Random(42);
+        var gen = new Generator(random, List.of(new PrimitiveValueGenerator(random), new StringValueGenerator(random)));
+
         try {
             Object generated = gen.generateValueOfType(Example.class);
             System.out.println(generated);

src/main/java/org/example/classes/BinaryTreeNode.java

@@ -1,5 +1,8 @@
 package org.example.classes;
 
+import org.example.annotation.Generatable;
+
+@Generatable
 public class BinaryTreeNode {
     private Integer data;
     private BinaryTreeNode left;
@@ -30,4 +33,13 @@ public void setLeft(BinaryTreeNode left) {
     public void setRight(BinaryTreeNode right) {
         this.right = right;
     }
+
+    @Override
+    public String toString() {
+        return "BinaryTreeNode{" +
+                "data=" + data +
+                ", left=" + left +
+                ", right=" + right +
+                '}';
+    }
 }

src/main/java/org/example/classes/Cart.java

@@ -2,6 +2,9 @@
 
 import java.util.List;
 
+import org.example.annotation.Generatable;
+
+@Generatable
 public class Cart {
     private List<Product> items;
 
@@ -18,4 +21,11 @@ public void setItems(List<Product> items) {
     }
 
     // Конструктор, методы добавления и удаления товаров, геттеры и другие методы
-}
+
+    @Override
+    public String toString() {
+        return "Cart{" +
+                "items=" + items +
+                '}';
+    }
+}

src/main/java/org/example/classes/CartStorage.java

@@ -0,0 +1,31 @@
+package org.example.classes;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.example.annotation.Generatable;
+
+@Generatable
+public class CartStorage {
+    private final Map<String, List<Cart>> buyerCarts;
+
+    public CartStorage(Map<String, List<Cart>> buyerCarts) {
+        this.buyerCarts = buyerCarts;
+    }
+
+    public Map<String, List<Cart>> getBuyerCarts() {
+        return buyerCarts;
+    }
+
+    public void addBuyerCart(String buyer, Cart cart) {
+        buyerCarts.computeIfAbsent(buyer, k -> new ArrayList<>()).add(cart);
+    }
+
+    @Override
+    public String toString() {
+        return "CartStorage{" +
+                "buyerCarts=" + buyerCarts +
+                '}';
+    }
+}

src/main/java/org/example/classes/Example.java

@@ -1,5 +1,8 @@
 package org.example.classes;
 
+import org.example.annotation.Generatable;
+
+@Generatable
 public class Example {
     int i;
 
@@ -9,6 +12,8 @@ public Example(int i) {
 
     @Override
     public String toString() {
-        return "Example(" + i + ")";
+        return "Example{" +
+                "i=" + i +
+                '}';
     }
 }

src/main/java/org/example/classes/Product.java

@@ -1,5 +1,8 @@
 package org.example.classes;
 
+import org.example.annotation.Generatable;
+
+@Generatable
 public class Product {
     private String name;
     private double price;
@@ -30,19 +33,11 @@ public void setPrice(double price) {
         this.price = price;
     }
 
-    @Override
-    public int hashCode() {
-        return super.hashCode();
-    }
-
-    @Override
-    public boolean equals(Object obj) {
-        return super.equals(obj);
-    }
-
     @Override
     public String toString() {
-        return super.toString();
+        return "Product{" +
+                "name='" + name + '\'' +
+                ", price=" + price +
+                '}';
     }
-
 }

src/main/java/org/example/classes/Rectangle.java

@@ -1,5 +1,8 @@
 package org.example.classes;
 
+import org.example.annotation.Generatable;
+
+@Generatable
 public class Rectangle implements Shape {
     private double length;
     private double width;
@@ -18,4 +21,12 @@ public double getArea() {
     public double getPerimeter() {
         return 2 * (length + width);
     }
-}
+
+    @Override
+    public String toString() {
+        return "Rectangle{" +
+                "length=" + length +
+                ", width=" + width +
+                '}';
+    }
+}

src/main/java/org/example/classes/Shape.java

@@ -3,4 +3,4 @@
 public interface Shape {
     double getArea();
     double getPerimeter();
-}
+}

src/main/java/org/example/classes/Triangle.java

@@ -1,5 +1,8 @@
 package org.example.classes;
 
+import org.example.annotation.Generatable;
+
+@Generatable
 public class Triangle implements Shape {
     private double sideA;
     private double sideB;
@@ -21,4 +24,13 @@ public double getArea() {
     public double getPerimeter() {
         return sideA + sideB + sideC;
     }
-}
+
+    @Override
+    public String toString() {
+        return "Triangle{" +
+                "sideA=" + sideA +
+                ", sideB=" + sideB +
+                ", sideC=" + sideC +
+                '}';
+    }
+}