code: public static EntityGetOperation<AssetFileInfo> get(String assetFileId) {
          return new DefaultGetOperation<AssetFileInfo>(ENTITY_SET, assetFileId,
                  AssetFileInfo.class);
      }
docs: Call the service to get a single asset file entity
  
  @param assetFileId
  id of file to get
  @return the get operation to pass to rest proxy