add classes of composite pattern

Author: git-growthdev

src/Structural/Composite/CatalogComponent.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1); 
+
+namespace Growthdev\DesignPatterns\Structural\Composite;
+
+use BadMethodCallException;
+
+abstract class CatalogComponent
+{
+ protected function add(CatalogComponent $catalogComponent): void
+ {
+ throw new BadMethodCallException('Method not implemented');
+ }
+
+ protected function remove(CatalogComponent $catalogComponent): void
+ {
+ throw new BadMethodCallException('Method not implemented');
+ }
+
+ protected function getChild(CatalogComponent $catalogComponent): CatalogComponent
+ {
+ throw new BadMethodCallException('Method not implemented');
+ }
+
+ abstract protected function display(): void;
+}

src/Structural/Composite/Product.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Structural\Composite;
+
+final class Product extends CatalogComponent
+{
+ public readonly string $name;
+ public readonly float $price;
+
+ public function __construct(string $name, float $price)
+ {
+ $this->name = $name;
+ $this->price = $price;
+ }
+
+ public function display(): void
+ {
+ printf("Product: %s R$ %.2f\n", $this->name, $this->price);
+ }
+}

src/Structural/Composite/ProductCatalog.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Structural\Composite;
+
+use SplObjectStorage;
+
+final class ProductCatalog extends CatalogComponent
+{
+ private SplObjectStorage $products;
+
+ public function __construct(private string $name)
+ {
+ $this->products = new SplObjectStorage();
+ }
+
+ public function add(CatalogComponent $catalogComponent): void
+ {
+ $this->products->attach($catalogComponent);
+ }
+
+ public function remove(CatalogComponent $catalogComponent): void
+ {
+ $this->products->detach($catalogComponent);
+ }
+
+ public function getChild(CatalogComponent $catalogComponent): CatalogComponent
+ {
+ if (!$this->products->contains($catalogComponent)) {
+ throw new \InvalidArgumentException('CatalogComponent not found');
+ }
+ return $catalogComponent;
+ }
+
+ public function display(): void
+ {
+ echo "Catalog: {$this->name}\n";
+ foreach ($this->products as $product) {
+ $product->display();
+ }
+ }
+}

tests/Structural/Composite/CompositeTest.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Tests\Structural\Composite;
+
+use Growthdev\DesignPatterns\Structural\Composite\Product;
+use Growthdev\DesignPatterns\Structural\Composite\ProductCatalog;
+use PHPUnit\Framework\TestCase;
+
+final class CompositeTest extends TestCase
+{
+ public function testCanCreateProductCatalog(): void
+ {
+ $catalog = new ProductCatalog('Catalog 1');
+ $catalog2 = new ProductCatalog('Catalog 2');
+
+ $catalog->add(new Product('Product 1', 10.0));
+ $catalog->add(new Product('Product 2', 20.0));
+ $catalog->add($catalog2);
+ $catalog->getChild($catalog2)->add(new Product('Product 3', 30.0));
+ $catalog->getChild($catalog2)->add(new Product('Product 4', 40.0));
+ $catalog->getChild($catalog2)->add(new Product('Product 5', 50.0));
+
+ $catalog->display();
+ 
+ $this->expectOutputString(
+ "Catalog: Catalog 1\n" .
+ "Product: Product 1 R$ 10.00\n" .
+ "Product: Product 2 R$ 20.00\n" .
+ "Catalog: Catalog 2\n" .
+ "Product: Product 3 R$ 30.00\n" .
+ "Product: Product 4 R$ 40.00\n" .
+ "Product: Product 5 R$ 50.00\n"
+ );
+ }
+}