public QuoteCollector(Playlist playlist, CultureMapper cultureMapper)
{
// checking preconditions
if (playlist == null || cultureMapper == null)
{
throw new ArgumentNullException();
}
_playlist = playlist;
_cultureMapper = cultureMapper;
_parsePageContentsAndExtractQuotes = ParsePageContentsAndExtractQuotes;
_extractTopicTranslationsDelegate = ExtractTopicTranslations;
_topicTranslationsRegex = CompileRegex(cultureMapper.ToList(), TopicTranslationRegexPattern, RegexOptions.ExplicitCapture);
}