How to use

ISaveFormat

in

net.minecraft.world.storage

/**
 * Requires to start up from external from here
 *
 * drawback of the singleton build style
 *
 * @param server
 */
public static void onServerAboutToStart( MinecraftServer server )
{
  File worldDirectory = DimensionManager.getCurrentSaveRootDirectory();
  if( worldDirectory == null )
  {
    worldDirectory = server.getActiveAnvilConverter().getSaveLoader( server.getFolderName(), false ).getWorldDirectory();
  }
  final WorldData newInstance = new WorldData( worldDirectory );
  instance = newInstance;
  newInstance.onServerStarting();
}

/**
 * Ensures that a proposed directory name doesn't collide with existing names.
 * Returns the name, possibly modified to avoid collisions.
 *
 * @param saveLoader the save loader
 * @param name the name
 * @return the uncolliding save dir name
 */
public static String getUncollidingSaveDirName(ISaveFormat saveLoader, String name)
{
  name = name.replaceAll("[\\./\"]", "_");
  for (String s : DISALLOWED_FILENAMES)
  {
    if (name.equalsIgnoreCase(s))
    {
      name = "_" + name + "_";
    }
  }
  while (saveLoader.getWorldInfo(name) != null)
  {
    name = name + "-";
  }
  return name;
}