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<?php
/**
* Use the SilverStripe configuration system to lookup config for a
* particular service.
*
* @package framework
* @subpackage injector
*/
class SilverStripeServiceConfigurationLocator extends ServiceConfigurationLocator {
/**
* List of Injector configurations cached from Config in class => config format.
* If any config is false, this denotes that this class and all its parents
* have no configuration specified.
*
* @var array
*/
protected $configs = array();
public function locateConfigFor($name) {
// Check direct or cached result
$config = $this->configFor($name);
if($config !== null) return $config;
// do parent lookup if it's a class
if (class_exists($name)) {
$parents = array_reverse(array_keys(ClassInfo::ancestry($name)));
array_shift($parents);
foreach ($parents as $parent) {
// have we already got for this?
$config = $this->configFor($parent);
if($config !== null) {
// Cache this result
$this->configs[$name] = $config;
return $config;
}
}
}
// there is no parent config, so we'll record that as false so we don't do the expensive
// lookup through parents again
$this->configs[$name] = false;
}
/**
* Retrieves the config for a named service without performing a hierarchy walk
*
* @param string $name Name of service
* @return mixed Returns either the configuration data, if there is any. A missing config is denoted
* by a value of either null (there is no direct config assigned and a hierarchy walk is necessary)
* or false (there is no config for this class, nor within the hierarchy for this class).
*/
protected function configFor($name) {
// Return cached result
if (isset($this->configs[$name])) {
return $this->configs[$name]; // Potentially false
}
$config = Config::inst()->get('Injector', $name);
if ($config) {
$this->configs[$name] = $config;
return $config;
} else {
return null;
}
}
}
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