/// <summary>
/// Returns the next PDF document in the cycle.
/// Throws exceptions if the PDF document cannot be found or opened.
/// If the last file changed in the meantime, allow it to be returned again.
/// </summary>
/// <exception cref="FileNotFoundException">If no files are available.</exception>
/// <exception cref="DirectoryNotFoundException">If the PDF directory is missing or could not be read (e. g. due to network issues).</exception>
/// <exception cref="PdfAccessException">If something went wrong while opening a file.</exception>
public IPdfDocument GetNextDocument()
{
try
{
// if OnInvalidate was invoked previously, allow GetNextDocument() to return the same file again
return(repository.GetDocument(GetNextFileName(includeCurrentFile: invalidateInvoked)));
}
finally
{
// re-enable event
invalidateInvoked = false;
}
}
