silverstripe-framework/control/injector/SilverStripeServiceConfigurationLocator.php

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<?php
/**
* Use the SilverStripe configuration system to lookup config for a
* particular service.
*
* @package framework
* @subpackage injector
*/
class SilverStripeServiceConfigurationLocator {
private $configs = array();
public function locateConfigFor($name) {
if (isset($this->configs[$name])) {
return $this->configs[$name];
}
$config = Config::inst()->get('Injector', $name);
if ($config) {
$this->configs[$name] = $config;
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 $parent) {
// have we already got for this?
if (isset($this->configs[$parent])) {
return $this->configs[$parent];
}
$config = Config::inst()->get('Injector', $parent);
if ($config) {
$this->configs[$name] = $config;
return $config;
} else {
$this->configs[$parent] = false;
}
}
// 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;
}
}
}