Implemented OptionalGetParameterService

application/symfony/src/Domain/ParameterManagement/OptionalGetParameterService.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace Infinito\Domain\ParameterManagement;
+
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Request;
+use Infinito\Exception\UnvalidParameterException;
+use Infinito\Exception\NotDefinedException;
+
+/**
+ * @author kevinfrantz
+ */
+final class OptionalGetParameterService implements OptionalGetParameterServiceInterface
+{
+    /**
+     * @var Request
+     */
+    private $currentRequest;
+
+    /**
+     * @param string $key
+     *
+     * @throws UnvalidParameterException If the parameter is not valid
+     */
+    private function validateParameter(string $key): void
+    {
+        if (in_array($key, self::OPTIONAL_PARAMETERS)) {
+            return;
+        }
+        throw new UnvalidParameterException("Parameter <<$key>> isn't valid.");
+    }
+
+    /**
+     * @param RequestStack $requestStack
+     */
+    private function setCurrentRequest(RequestStack $requestStack): void
+    {
+        $this->currentRequest = $requestStack->getCurrentRequest();
+    }
+
+    private function validateCurrentRequestKeys(): void
+    {
+        foreach ($this->currentRequest->query->keys() as $key) {
+            $this->validateParameter($key);
+        }
+    }
+
+    /**
+     * @param RequestStack $requestStack
+     */
+    public function __construct(RequestStack $requestStack)
+    {
+        $this->setCurrentRequest($requestStack);
+        $this->validateCurrentRequestKeys();
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see \Infinito\Domain\ParameterManagement\OptionalGetParameterServiceInterface::hasParameter()
+     */
+    public function hasParameter(string $key): bool
+    {
+        $this->validateParameter($key);
+
+        return $this->currentRequest->query->has($key);
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see \Infinito\Domain\ParameterManagement\OptionalGetParameterServiceInterface::getParameter()
+     */
+    public function getParameter(string $key)
+    {
+        $this->validateParameter($key);
+        if ($this->hasParameter($key)) {
+            return $this->currentRequest->get($key);
+        }
+        throw new NotDefinedException("The parameter <<$key>> is not defined!");
+    }
+}