Creational/Builder

.php-cs-fixer.php

@@ -2,9 +2,7 @@
 
 declare(strict_types = 1);
 
-use PhpCsFixer\Config;
-use PhpCsFixer\Finder;
-use PhpCsFixer\Runner\Parallel\ParallelConfigFactory;
+use PhpCsFixer\{Config, Finder, Runner\Parallel\ParallelConfigFactory};
 
 $finder = (new Finder())->in([
     __DIR__ . '/src',

code/builder.php

@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-04
+ * @time: 00:19
+ */
+
+declare(strict_types = 1);
+
+use Pattern\Creational\Builder\BigMacBuilder;
+use Pattern\Creational\Builder\Director;
+
+/**
+ * The client code creates a builder object, passes it to the director and then
+ * initiates the construction process. The end result is retrieved from the
+ * builder object.
+ *
+ * @noinspection ForgottenDebugOutputInspection*/
+function clientCode(Director $director): void
+{
+    $builder = new BigMacBuilder();
+    $director->setBuilder($builder);
+
+    echo 'Preparing full featured Big Mac...';
+    $director->regularBigMac();
+    dump($builder->getBigMac()->getIngredients());
+
+    echo 'Preparing vegan Big Mac...';
+    $director->veganBigMac();
+    dump($builder->getBigMac()->getIngredients());
+
+    // The Builder pattern can be used without a Director class.
+    echo 'Preparing a custom snack...';
+    $builder->produceBun();
+    $builder->produceMeat();
+    $builder->produceSauce();
+    dump($builder->getBigMac()->getIngredients());
+}
+
+
+clientCode(new Director());

src/Pattern/Creational/Builder/BigMac.php

@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-04
+ * @time: 00:21
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Creational\Builder;
+
+class BigMac
+{
+    /**
+     * @var array
+     */
+    private array $ingredients = [];
+
+    /**
+     * @param  string  $ingredient
+     *
+     * @return $this
+     */
+    public function setIngredient(string $ingredient): static
+    {
+        $this->ingredients[] = $ingredient;
+
+        return $this;
+    }
+
+    /**
+     * @return array
+     */
+    public function getIngredients(): array
+    {
+        return $this->ingredients;
+    }
+}

src/Pattern/Creational/Builder/BigMacBuilder.php

@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-04
+ * @time: 00:42
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Creational\Builder;
+
+/**
+ * The BigMac Builder classes follow the BigMacBuilderInterface interface and provide
+ * specific implementations of the building steps. The program may have several
+ * variations of BigMac Builders, implemented differently.
+ */
+class BigMacBuilder implements BigMacBuilderInterface
+{
+    private BigMac $bigMac;
+
+    /**
+     * A fresh builder instance should contain a blank BigMac object, which is
+     * used in further assembly.
+     */
+    public function __construct()
+    {
+        $this->reset();
+    }
+
+    public function reset(): void
+    {
+        $this->bigMac = new BigMac();
+    }
+
+    /**
+     * All production steps work with the same BigMac instance.
+     */
+    public function produceBun(): void
+    {
+        $this->bigMac->setIngredient('A three-slice sesame seed bun');
+    }
+
+    public function produceVeganBun(): void
+    {
+        $this->bigMac->setIngredient('A three-slice dairy-free bun');
+    }
+
+    public function produceMeat(): void
+    {
+        $this->bigMac->setIngredient('Two 1.6 oz beef patties');
+    }
+
+    public function produceVeganMeat(): void
+    {
+        $this->bigMac->setIngredient('Two plant-based burgers, like Impossible Burgers or Pureland Farm Burgers');
+    }
+
+    public function produceSauce(): void
+    {
+        $this->bigMac->setIngredient('"special sauce" (similar to Thousand Island dressing)');
+    }
+
+    public function produceVeganSauce(): void
+    {
+        $this->bigMac->setIngredient('Vegan special sauce');
+    }
+
+    public function produceLettuce(): void
+    {
+        $this->bigMac->setIngredient('Shredded iceberg lettuce');
+    }
+
+    public function produceCheese(): void
+    {
+        $this->bigMac->setIngredient('One slice of processed American cheese');
+    }
+
+    public function produceVeganCheese(): void
+    {
+        $this->bigMac->setIngredient('One slice of vegan American or cheddar cheese');
+    }
+
+    public function producePickles(): void
+    {
+        $this->bigMac->setIngredient('Two dill pickle slices');
+    }
+
+    public function produceOnions(): void
+    {
+        $this->bigMac->setIngredient('Minced onions');
+    }
+
+    /**
+     * MigMac Builders are supposed to provide their own methods for
+     * retrieving results. That's because various types of builders may create
+     * entirely different BigMacs that don't follow the same interface.
+     * Therefore, such methods cannot be declared in the base Builder interface
+     * (at least in a statically typed programming language). Note that PHP is a
+     * dynamically typed language and this method CAN be in the base interface.
+     * However, we won't declare it there for the sake of clarity.
+     *
+     * Usually, after returning the end result to the client, a builder instance
+     * is expected to be ready to start producing another BigMac. That's why
+     * it's a usual practice to call the reset method at the end of the
+     * `getBigMac` method body. However, this behavior is not mandatory, and
+     * you can make your builders wait for an explicit reset call from the
+     * client code before disposing of the previous result.
+     */
+    public function getBigMac(): BigMac
+    {
+        $result = $this->bigMac;
+        $this->reset();
+
+        return $result;
+    }
+}

src/Pattern/Creational/Builder/BigMacBuilderInterface.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-04
+ * @time: 00:32
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Creational\Builder;
+
+/**
+ * The BigMacBuilderInterface specifies methods for creating the different parts of
+ * the BigMac objects.
+ */
+interface BigMacBuilderInterface
+{
+    public function produceBun(): void;
+
+    public function produceVeganBun(): void;
+
+    public function produceMeat(): void;
+
+    public function produceVeganMeat(): void;
+
+    public function produceSauce(): void;
+
+    public function produceVeganSauce(): void;
+
+    public function produceLettuce(): void;
+
+    public function produceCheese(): void;
+
+    public function produceVeganCheese(): void;
+
+    public function producePickles(): void;
+
+    public function produceOnions(): void;
+}

src/Pattern/Creational/Builder/Director.php

@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-04
+ * @time: 01:49
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Creational\Builder;
+
+/**
+ * The Director is only responsible for executing the building steps in a
+ * particular sequence. It is helpful when producing Big Macs according to a
+ * specific order or configuration. Strictly speaking, the Director class is
+ * optional, since the client can control builders directly.
+ */
+class Director
+{
+    /**
+     * @var BigMacBuilder
+     */
+    private BigMacBuilder $builder;
+
+    /**
+     * The Director works with any builder instance that the client code passes
+     * to it. This way, the client code may alter the final type of the newly
+     * assembled product.
+     */
+    public function setBuilder(BigMacBuilder $builder): void
+    {
+        $this->builder = $builder;
+    }
+
+    /**
+     * The Director can construct several product variations using the same
+     * building steps.
+     */
+    public function regularBigMac(): void
+    {
+        $this->builder->produceBun();
+        $this->builder->produceMeat();
+        $this->builder->produceSauce();
+        $this->builder->produceLettuce();
+        $this->builder->produceCheese();
+        $this->builder->producePickles();
+        $this->builder->produceOnions();
+    }
+
+    public function veganBigMac(): void
+    {
+        $this->builder->produceVeganBun();
+        $this->builder->produceVeganMeat();
+        $this->builder->produceVeganSauce();
+        $this->builder->produceLettuce();
+        $this->builder->produceVeganCheese();
+        $this->builder->producePickles();
+        $this->builder->produceOnions();
+    }
+}

src/helpers.php

@@ -9,6 +9,8 @@
 
 declare(strict_types = 1);
 
+use Random\RandomException;
+
 /**
  * @param ...$vars
  *
@@ -36,7 +38,7 @@ function trace(): string
 }
 
 /**
- * @throws \Random\RandomException
+ * @throws RandomException
  */
 function getFloatRange(): float
 {