checkSaveLocation<T extends SaveLocation> method

@protected T? checkSaveLocation<T extends SaveLocation>(SaveLocation? saveLocation)

Returns saveLocation as a location of the running platform, T, or null for the platform's default. Call it after handling PathLocation.

Throws InvalidInputException for another platform's location, such as IosSaveLocation.photos on macOS, and for a PickedDirectoryLocation, which saveAs and openWriteAs take.

Implementation

@protected
T? checkSaveLocation<T extends SaveLocation>(SaveLocation? saveLocation) {
  return switch (saveLocation) {
    null => null,
    final T location => location,
    PickedDirectoryLocation() => throw const InvalidInputException(
      'A PickedDirectoryLocation is saved to with saveAs or openWriteAs.',
    ),
    _ => throw InvalidInputException(
      "$saveLocation isn't a save location on this platform. Pass a $T, a "
      'PathLocation, or null for the default.',
    ),
  };
}