/**
  * getAsset - render assets of a given type for a package
  *
  * @param  string                              $name
  * @param  sfDynamicsAssetCollectionDefinition $package
  * @param  string                              $type
  * @return string
  */
 public function getAsset($name, sfDynamicsAssetCollectionDefinition $package, $type)
 {
     $extension = sfDynamics::getExtensionFromType($type);
     $getAssets = 'get' . ucfirst($type) . 's';
     if (count($assets = $package->{$getAssets}())) {
         $paths = $package->getPaths('/' . $extension);
         if (sfDynamicsConfig::isCacheEnabled()) {
             $cacheKey = sfDynamicsCache::generateKey($package, $type);
             $cache = sfDynamics::getCache();
             if ($cache->has($cacheKey)) {
                 if (sfDynamicsConfig::isCacheUpToDateCheckEnabled()) {
                     foreach ($assets as $asset) {
                         // this is needed to know the actual file path on disk, and to know its mtime.
                         $asset->computePath($paths);
                     }
                     if ($cache->isStillUpToDate($package, $type, $cacheKey)) {
                         $result = $cache->get($cacheKey);
                     }
                 } else {
                     $result = $cache->get($cacheKey);
                 }
             }
         }
         // still no result? let's build it!
         if (!isset($result)) {
             $result = $this->getConcatenatedAssets($package, $paths, $assets);
             $result = sfDynamicsConfig::getConcatenatedAssetFilterChainFor($type)->filter($result);
             if (sfDynamicsConfig::isCacheEnabled()) {
                 $cache->set($cacheKey, $result);
             }
         }
         return $result;
     } else {
         return '';
     }
 }