/**
* Loads all *.php files found at the sdk path module/sdk/{version}/lib and adds this.loadClass to
* spl autoloader chain.
*
* @param string|null $version - either use this version (e.g. '3.0')
* or take it from config.version if passed falsish value.
*
* @sideeffect if passed a version will update this.config to that version.
*/
public function __construct($version = null)
{
if ($version) {
// provided a version, update config so we can use in the class loader later
Config::inst()->update(__CLASS__, 'version', $version);
} else {
// no version, try and take from config instead.
$version = $this->config()->get('version');
}
$pathTemp = $this->config()->get('sdk_path');
// if sdk path is 'absolute' then load from site root, otherwise load relative to checkfront module directory
$this->sdkPath = Controller::join_links(Director::baseFolder(), substr($pathTemp, 0, 1) === '/' ? '' : CheckfrontModule::module_path(), $this->detokenise($pathTemp, $version));
// now save the implementation path for later
$this->implPath = Controller::join_links(Director::baseFolder(), CheckfrontModule::module_path(), $this->detokenise($this->config()->get('implementation_path'), $version));
spl_autoload_register(array($this, 'loadClass'));
}