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<?php
namespace Core;
use RuntimeException;
/**
* The registry class is a dependency injection container
*
* @property mixed db
* @property mixed event
* @package core
* @author Frederic Guillot
*/
class Registry
{
/**
* Contains all dependencies
*
* @access private
* @var array
*/
private $container = array();
/**
* Contains all instances
*
* @access private
* @var array
*/
private $instances = array();
/**
* Set a dependency
*
* @access public
* @param string $name Unique identifier for the service/parameter
* @param mixed $value The value of the parameter or a closure to define an object
*/
public function __set($name, $value)
{
$this->container[$name] = $value;
}
/**
* Get a dependency
*
* @access public
* @param string $name Unique identifier for the service/parameter
* @return mixed The value of the parameter or an object
* @throws RuntimeException If the identifier is not found
*/
public function __get($name)
{
if (isset($this->container[$name])) {
if (is_callable($this->container[$name])) {
return $this->container[$name]();
}
else {
return $this->container[$name];
}
}
throw new \RuntimeException('Identifier not found in the registry: '.$name);
}
/**
* Return a shared instance of a dependency
*
* @access public
* @param string $name Unique identifier for the service/parameter
* @return mixed Same object instance of the dependency
*/
public function shared($name)
{
if (! isset($this->instances[$name])) {
$this->instances[$name] = $this->$name;
}
return $this->instances[$name];
}
}
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