private BackupFolder getBackupFolder(String label) throws MessagingException {
if (label == null) throw new IllegalStateException("label is null");
try {
BackupFolder folder = new BackupFolder(this, label);
if (!folder.exists()) {
folder.create(FolderType.HOLDS_MESSAGES);
Log.i(TAG, "Label '" + label + "' does not exist yet. Creating.");
}
folder.open(OpenMode.READ_WRITE);
return folder;
} catch (java.lang.NumberFormatException e) {
// thrown inside K9
Log.e(TAG, "K9 error", e);
throw new MessagingException(e.getMessage());
}
}