add Chain of Responsabily Pattern

Author: git-growthdev

src/Behavioral/ChainOfResponsability/ApproveHandler.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Behavioral\ChainOfResponsability;
+
+abstract class ApproveHandler implements SaleHandler
+{
+ private ?ApproveHandler $nextHandler = null;
+
+ public final function setNext(ApproveHandler $nextHandler): ApproveHandler
+ {
+ $this->nextHandler = $nextHandler;
+ return $nextHandler;
+ }
+
+ public function processSale(Sale $sale): void
+ {
+ if ($this->nextHandler) {
+ $this->nextHandler->processSale($sale);
+ }
+ }
+}

src/Behavioral/ChainOfResponsability/DirectorHandler.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Behavioral\ChainOfResponsability;
+
+// Diretor
+final class DirectorHandler extends ApproveHandler
+{
+ public function processSale(Sale $sale): void
+ {
+ if ($sale->price >= 30_000) {
+ printf("Sale approved by director with price %.2f\n", $sale->price);
+ } else {
+ parent::processSale($sale);
+ }
+ }
+}

src/Behavioral/ChainOfResponsability/ManagerHandler.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Behavioral\ChainOfResponsability;
+
+// gerente
+final class ManagerHandler extends ApproveHandler
+{
+ public function processSale(Sale $sale): void
+ {
+ if ($sale->price >= 3_000 && $sale->price < 30_000) {
+ printf("Sale approved by manager with price %.2f\n", $sale->price);
+ } else {
+ parent::processSale($sale);
+ }
+ }
+}

src/Behavioral/ChainOfResponsability/Sale.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Behavioral\ChainOfResponsability;
+
+final class Sale
+{
+ public readonly float $price;
+
+ public function __construct(float $price)
+ {
+ $this->price = $price;
+ }
+}

src/Behavioral/ChainOfResponsability/SaleHandler.php

@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+namespace DesignPattern\Behavioral\ChainOfResponsability;
+
+namespace Growthdev\DesignPatterns\Behavioral\ChainOfResponsability;
+
+interface SaleHandler 
+{
+ public function processSale(Sale $sale): void;
+}

src/Behavioral/ChainOfResponsability/SellerHandler.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Behavioral\ChainOfResponsability;
+
+// vendedor
+final class SellerHandler extends ApproveHandler
+{
+ public function processSale(Sale $sale): void
+ { 
+ if ($sale->price < 3_000) {
+ printf("Sale approved by seller with price %.2f\n", $sale->price);
+ } else {
+ parent::processSale($sale);
+ }
+ }
+}

tests/Behavioral/ChainOfResponsability/ChainOfResponsabilityTest.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Tests\Behavioral\ChainOfResponsability;
+
+use Growthdev\DesignPatterns\Behavioral\ChainOfResponsability\DirectorHandler;
+use Growthdev\DesignPatterns\Behavioral\ChainOfResponsability\ManagerHandler;
+use Growthdev\DesignPatterns\Behavioral\ChainOfResponsability\Sale;
+use Growthdev\DesignPatterns\Behavioral\ChainOfResponsability\SellerHandler;
+use PHPUnit\Framework\TestCase;
+
+final class ChainOfResponsabilityTest extends TestCase
+{
+ public function testExpectOfApproveBySeller()
+ {
+ $seller = new SellerHandler;
+ $seller->setNext(new ManagerHandler)
+ ->setNext(new DirectorHandler);
+
+ // Request
+ $sale = new Sale(2_999.99);
+ $seller->processSale($sale);
+
+ $this->expectOutputString("Sale approved by seller with price 2999.99\n");
+ }
+
+ public function testExpectOfApproveByManager()
+ {
+ $seller = new SellerHandler;
+ $seller->setNext(new ManagerHandler)
+ ->setNext(new DirectorHandler);
+
+ // Request
+ $sale = new Sale(3_999.99);
+ $seller->processSale($sale);
+
+ $this->expectOutputString("Sale approved by manager with price 3999.99\n");
+ }
+
+ public function testExpectOfApproveByDirector()
+ {
+ $seller = new SellerHandler;
+ $seller->setNext(new ManagerHandler)
+ ->setNext(new DirectorHandler);
+
+ // Request
+ $sale = new Sale(30_000.01);
+ $seller->processSale($sale);
+
+ $this->expectOutputString("Sale approved by director with price 30000.01\n");
+ }
+}