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<?php namespace Illuminate\Support;
use Closure;
abstract class Manager {
/**
* The application instance.
*
* @var \Illuminate\Foundation\Application
*/
protected $app;
/**
* The registered custom driver creators.
*
* @var array
*/
protected $customCreators = array();
/**
* The array of created "drivers".
*
* @var array
*/
protected $drivers = array();
/**
* Create a new manager instance.
*
* @param \Illuminate\Foundation\Application $app
* @return void
*/
public function __construct($app)
{
$this->app = $app;
}
/**
* Get a driver instance.
*
* @param string $driver
* @return mixed
*/
public function driver($driver = null)
{
$driver = $driver ?: $this->getDefaultDriver();
// If the given driver has not been created before, we will create the instances
// here and cache it so we can return it next time very quickly. If there is
// already a driver created by this name, we'll just return that instance.
if ( ! isset($this->drivers[$driver]))
{
$this->drivers[$driver] = $this->createDriver($driver);
}
return $this->drivers[$driver];
}
/**
* Create a new driver instance.
*
* @param string $driver
* @return mixed
*
* @throws \InvalidArgumentException
*/
protected function createDriver($driver)
{
$method = 'create'.ucfirst($driver).'Driver';
// We'll check to see if a creator method exists for the given driver. If not we
// will check for a custom driver creator, which allows developers to create
// drivers using their own customized driver creator Closure to create it.
if (isset($this->customCreators[$driver]))
{
return $this->callCustomCreator($driver);
}
elseif (method_exists($this, $method))
{
return $this->$method();
}
throw new \InvalidArgumentException("Driver [$driver] not supported.");
}
/**
* Call a custom driver creator.
*
* @param string $driver
* @return mixed
*/
protected function callCustomCreator($driver)
{
return $this->customCreators[$driver]($this->app);
}
/**
* Register a custom driver creator Closure.
*
* @param string $driver
* @param Closure $callback
* @return \Illuminate\Support\Manager|static
*/
public function extend($driver, Closure $callback)
{
$this->customCreators[$driver] = $callback;
return $this;
}
/**
* Get all of the created "drivers".
*
* @return array
*/
public function getDrivers()
{
return $this->drivers;
}
/**
* Dynamically call the default driver instance.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function __call($method, $parameters)
{
return call_user_func_array(array($this->driver(), $method), $parameters);
}
}
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