prepare for testing

phpstan.neon

@@ -1,4 +1,4 @@
 parameters:
-	level: 1
+	level: 2
 	paths:
 		- src

src/Container.php

@@ -4,11 +4,19 @@
 
 namespace Danu\PhpDi;
 
+use Danu\PhpDi\Contracts\ContainerContract;
+use Danu\PhpDi\Exception\ContainerException;
 use ReflectionClass;
+use ReflectionException;
 use ReflectionNamedType;
 
-final class Container
+class Container implements ContainerContract
 {
+    /**
+     * @var array
+     */
+    private array $services = [];
+
     /**
      * The container's  instance.
      *
@@ -27,13 +35,32 @@ final class Container
     public static function instance(): static
     {
 
-        if (is_null(static::$instance)) {
-            static::$instance = new static;
+        if (!isset(self::$instance)) {
+            self::$instance = new self();
         }
 
-        return static::$instance;
+        return self::$instance;
+    }
+
+    /**
+     * @param string $id
+     * @return object
+     */
+    public function get(string $id): object
+    {
+        if(!isset($this->services[$id])) throw ContainerException::notFoundContainer($id);
+
+        return $this->make($this->services[$id]);
     }
 
+    /**
+     * @param string $id
+     * @return bool
+     */
+    public function has(string $id): bool
+    {
+        return isset($this->services[$id]);
+    }
 
     /**
      * @param $class
@@ -42,10 +69,15 @@ public static function instance(): static
      */
     public function make($class, array $parameters = []): mixed
     {
-        $classReflection = new ReflectionClass($class);
+        try {
+            $classReflection = new ReflectionClass($class);
+        } catch (ReflectionException $e) {
+            throw ContainerException::classDoesNotExist($class::class);
+        }
+
         $constructorParams = $classReflection->getConstructor()->getParameters();
 
-        $dependencies = $dependencies = $this->resolveParams($constructorParams, $parameters);
+        $dependencies = $this->resolveParams($constructorParams, $parameters);
 
         return $classReflection->newInstance(...$dependencies);
     }
@@ -121,4 +153,8 @@ private function __construct()
     private function __clone(): void
     {
     }
+
+    private function __wakeup()
+    {
+    }
 }

src/Contracts/ContainerContract.php

@@ -11,20 +11,14 @@ interface ContainerContract
      *
      * @param string $id Identifier of the entry to look for.
      *
-     * @throws NotFoundExceptionInterface  No entry was found for **this** identifier.
-     * @throws ContainerExceptionInterface Error while retrieving the entry.
-     *
      * @return mixed Entry.
      */
     public function get(string $id): mixed;
 
     /**
      * Returns true if the container can return an entry for the given identifier.
      * Returns false otherwise.
-     *
-     * `has($id)` returning true does not mean that `get($id)` will not throw an exception.
-     * It does however mean that `get($id)` will not throw a `NotFoundExceptionInterface`.
-     *
+     **
      * @param string $id Identifier of the entry to look for.
      *
      * @return bool

src/Exception/ContainerException.php

@@ -8,8 +8,13 @@ class ContainerException extends InternalException
      * @param string $id
      * @return static
      */
-    public static function NotFoundContainer(string $id): static
+    public static function notFoundContainer(string $id): static
     {
         return self::make("No entry was found for **this** identifier: {$id}");
     }
+
+    public static function classDoesNotExist(string $className): static
+    {
+        return self::make("Class does not exist: {$className}");
+    }
 }