public function build(ServiceContainer $container)
{
foreach ($this->extensions as $extension) {
foreach ($extension->dependsOn() as $expectedExtensionClass) {
if (!array_key_exists($expectedExtensionClass, $this->extensions)) {
throw KernelException::missingExtension($expectedExtensionClass);
}
}
}
foreach ($this->extensions as $extension) {
$extension->build($container);
}
}