code: public static void setStorageFileProvider (@Nonnull final IFunction <InternalErrorMetadata, File> aStorageFileProvider)
    {
      ValueEnforcer.notNull (aStorageFileProvider, "StorageFileProvider");
      s_aStorageFileProvider = aStorageFileProvider;
    }
docs: Set the provider that defines how to build the filename to save internal
  error files.
  
  @param aStorageFileProvider
  Storage provider. May not be <code>null</code>
  @since 8.0.3