/// <summary>
/// Creates a new instance of the <see cref="NntpArticleBuilder"/> class.
/// </summary>
public NntpArticleBuilder()
{
headers = new MultiValueDictionary <string, string>();
body = new List <string>();
groupsBuilder = new NntpGroupsBuilder();
messageId = NntpMessageId.Empty;
}
/// <summary>
/// Initialize the <see cref="NntpArticleBuilder"/> from the given <see cref="NntpArticle"/>.
/// All properties are overwritten.
/// </summary>
/// <param name="article">The <see cref="NntpArticle"/> to initialize the <see cref="NntpArticleBuilder"/> with.</param>
/// <returns>The <see cref="NntpArticleBuilder"/> so that additional calls can be chained.</returns>
public NntpArticleBuilder InitializeFrom(NntpArticle article)
{
Guard.ThrowIfNull(article, nameof(article));
messageId = new NntpMessageId(article.MessageId.Value);
groupsBuilder = new NntpGroupsBuilder().Add(article.Groups);
headers = new MultiValueDictionary <string, string>();
from = null;
subject = null;
dateTime = null;
body = null;
foreach (KeyValuePair <string, ImmutableHashSet <string> > header in article.Headers)
{
foreach (string value in header.Value)
{
switch (header.Key)
{
case NntpHeaders.MessageId:
if (!messageId.HasValue)
{
messageId = value;
}
else
{
log.Warn("Found more than 1 {messageId} header. Skipping it.", NntpHeaders.MessageId);
}
break;
case NntpHeaders.From:
if (from == null)
{
from = value;
}
else
{
log.Warn("Found more than 1 {from} header. Skipping it.", NntpHeaders.From);
}
break;
case NntpHeaders.Subject:
if (subject == null)
{
subject = value;
}
else
{
log.Warn("Found more than 1 {subject} header. Skipping it.", NntpHeaders.Subject);
}
break;
case NntpHeaders.Date:
if (dateTime == null)
{
if (DateTimeOffset.TryParseExact(value, dateFormat, CultureInfo.InvariantCulture,
DateTimeStyles.None, out DateTimeOffset headerDateTime))
{
dateTime = headerDateTime;
}
else
{
log.Warn("{date} header has invalid value {value}. Skipping it.", NntpHeaders.Date, value);
}
}
else
{
log.Warn("Found more than 1 {date} header. Skipping it.", NntpHeaders.Date);
}
break;
case NntpHeaders.Newsgroups:
// convert group header to list of groups, do not add as header
groupsBuilder.Add(value);
break;
default:
headers.Add(header.Key, value);
break;
}
}
}
// make copy of body
body = article.Body.ToList();
return(this);
}
