Add Adapter Design Pattern

Author: git-growthdev

src/Structural/Adapter/CurrencyConverter.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Structural\Adapter;
+
+interface CurrencyConverter
+{
+ public function convert(float $amount): float;
+}

src/Structural/Adapter/CurrencyConverterAdapter.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Structural\Adapter;
+
+final class CurrencyConverterAdapter
+{
+ private CurrencyConverter $currencyConverter;
+
+ public function __construct(CurrencyConverter $currencyConverter)
+ {
+ $this->currencyConverter = $currencyConverter;
+ }
+
+ public function convert(float $amount): float
+ {
+ return $this->currencyConverter->convert($amount);
+ }
+}

src/Structural/Adapter/CurrencyToDollarConverter.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Structural\Adapter;
+
+final class CurrencyToDollarConverter implements CurrencyConverter
+{
+ public function convert(float $amount): float
+ {
+ return $amount * 5.61; // 1$ = R$ 5.61
+ }
+}

src/Structural/Adapter/CurrencyToEuroConverter.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Structural\Adapter;
+
+final class CurrencyToEuroConverter implements CurrencyConverter
+{
+ public function convert(float $amount): float
+ {
+ return $amount * 6.35; // 1 EUR = R$ 6.35
+ }
+}

tests/Structural/Adapter/CurrencyAdapterTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Growthdev\DesignPatterns\Tests\Structural\Adapter;
+
+use Growthdev\DesignPatterns\Structural\Adapter\CurrencyConverterAdapter;
+use Growthdev\DesignPatterns\Structural\Adapter\CurrencyToDollarConverter;
+use Growthdev\DesignPatterns\Structural\Adapter\CurrencyToEuroConverter;
+use PHPUnit\Framework\TestCase;
+
+final class CurrencyAdapterTest extends TestCase
+{
+ public function testCurrencyConverterToEuro(): void
+ {
+ $currencyConverter = new CurrencyConverterAdapter(new CurrencyToEuroConverter);
+ $this->assertEquals(6.35, $currencyConverter->convert(1.0));
+ }
+
+ public function testCurrencyConverterToDollar(): void
+ {
+ $currencyConverter = new CurrencyConverterAdapter(new CurrencyToDollarConverter);
+ $this->assertEquals(5.61, $currencyConverter->convert(1.0));
+ }
+}