ContainerBuilder: better error message when class is not instantiable (#105)

Author: matej21

src/DI/ContainerBuilder.php

@@ -494,9 +494,14 @@ private function resolveEntityClass($entity, $recursive = [])
 			return $this->definitions[$service]->getImplement() ?: $this->resolveServiceClass($service, $recursive);
 
 		} elseif (is_string($entity)) {
-			if (!class_exists($entity) || !(new ReflectionClass($entity))->isInstantiable()) {
-				$name = array_slice(array_keys($recursive), -1);
-				throw new ServiceCreationException("Class $entity used in service '$name[0]' not found or is not instantiable.");
+			$name = array_slice(array_keys($recursive), -1);
+			if (!class_exists($entity)) {
+				throw new ServiceCreationException("Class $entity used in service '$name[0]' not found.");
+			} elseif ((new ReflectionClass($entity))->isAbstract()) {
+				throw new ServiceCreationException("Class $entity used in service '$name[0]' is abstract.");
+			} elseif (($rm = (new ReflectionClass($entity))->getConstructor()) !== NULL && !$rm->isPublic()) {
+				$visibility = $rm->isProtected() ? 'protected' : 'private';
+				throw new ServiceCreationException("Class $entity used in service '$name[0]' has $visibility constructor.");
 			}
 			return ltrim($entity, '\\');
 		}

tests/DI/ContainerBuilder.factory.error.phpt

@@ -15,15 +15,15 @@ Assert::exception(function () {
 	$builder = new DI\ContainerBuilder;
 	$builder->addDefinition('one')->setClass('X')->setFactory('Unknown');
 	$builder->generateClasses();
-}, Nette\InvalidStateException::class, "Class Unknown used in service 'one' not found or is not instantiable.");
+}, Nette\InvalidStateException::class, "Class Unknown used in service 'one' not found.");
 
 
 Assert::exception(function () {
 	$builder = new DI\ContainerBuilder;
 	$builder->addDefinition('one')->setFactory('@two');
 	$builder->addDefinition('two')->setFactory('Unknown');
 	$builder->generateClasses();
-}, Nette\InvalidStateException::class, "Class Unknown used in service 'two' not found or is not instantiable.");
+}, Nette\InvalidStateException::class, "Class Unknown used in service 'two' not found.");
 
 
 Assert::exception(function () {
@@ -132,3 +132,29 @@ Assert::error(function () {
 	$builder->addDefinition('one')->setFactory('Bad7::create');
 	$builder->generateClasses();
 }, E_USER_NOTICE, "Type of service 'one' is unknown.");
+
+
+class Bad8
+{
+	private function __construct()
+	{}
+}
+
+Assert::exception(function () {
+	$builder = new DI\ContainerBuilder;
+	$builder->addDefinition('one')->setClass('Bad8');
+	$builder->generateClasses();
+}, Nette\InvalidStateException::class, "Class Bad8 used in service 'one' has private constructor.");
+
+
+abstract class Bad9
+{
+	protected function __construct()
+	{}
+}
+
+Assert::exception(function () {
+	$builder = new DI\ContainerBuilder;
+	$builder->addDefinition('one')->setClass('Bad9');
+	$builder->generateClasses();
+}, Nette\InvalidStateException::class, "Class Bad9 used in service 'one' is abstract.");