Method getAssetId

/**
 * Method to get the asset id from the asset key.
 *
 * @param   integer|string  $assetKey  The asset key (asset id or asset name).
 *
 * @return  integer  The asset id.
 *
 * @since   3.7.0
 */
protected static function getAssetId($assetKey)
{
    static $loaded = array();
    // If the asset is already an id return it.
    if (is_numeric($assetKey)) {
        return (int) $assetKey;
    }
    if (!isset($loaded[$assetKey])) {
        // It's the root asset.
        if (self::$rootAssetId !== null && $assetKey === self::$preloadedAssets[self::$rootAssetId]) {
            $loaded[$assetKey] = self::$rootAssetId;
        } else {
            $preloadedAssetsByName = array_flip(self::$preloadedAssets);
            // If we already have the asset name stored in preloading, example, a component, no need to fetch it from table.
            if (isset($preloadedAssetsByName[$assetKey])) {
                $loaded[$assetKey] = $preloadedAssetsByName[$assetKey];
            } else {
                $table = new Asset(Factory::getDbo());
                $table->load(array('name' => $assetKey));
                $loaded[$assetKey] = $table->id;
            }
        }
    }
    return (int) $loaded[$assetKey];
}