/// <summary>
/// Takes a flat list of MyPurdueSection objects and groups them together based on their LinkSelf and LinkOther values.
/// </summary>
/// <param name="sections">Flat list of MyPurdueSection objects</param>
/// <returns>Groups of sections to be processed into "classes"</returns>
private List <List <MyPurdueSection> > GroupSections(List <MyPurdueSection> sections)
{
var sectionsByLinks = new Dictionary <Tuple <string, string>, LinkSections>();
var independentSections = new List <MyPurdueSection>();
foreach (var section in sections)
{
if (section.LinkSelf == "" && section.LinkOther == "")
{
independentSections.Add(section);
continue;
}
var linkSelfTuple = new Tuple <string, string>(section.LinkSelf, section.Number);
var linkOtherTuple = new Tuple <string, string>(section.LinkOther, section.Number);
LinkSections linkSelfGroups = null;
sectionsByLinks.TryGetValue(linkSelfTuple, out linkSelfGroups);
LinkSections linkOtherGroups = null;
sectionsByLinks.TryGetValue(linkOtherTuple, out linkOtherGroups);
if (linkSelfGroups == null && linkOtherGroups == null)
{
var group = new LinkSections(section.LinkSelf, section.LinkOther, section);
sectionsByLinks[linkSelfTuple] = group;
sectionsByLinks[linkOtherTuple] = group;
}
else if (linkSelfGroups != null && linkOtherGroups == null)
{
linkSelfGroups.Add(section);
sectionsByLinks[linkOtherTuple] = linkSelfGroups;
}
else if (linkSelfGroups == null && linkOtherGroups != null)
{
linkOtherGroups.Add(section);
sectionsByLinks[linkSelfTuple] = linkOtherGroups;
}
else if (linkSelfGroups != null && linkOtherGroups != null)
{
if (linkSelfGroups != linkOtherGroups)
{
linkSelfGroups.Absorb(linkOtherGroups);
foreach (var l in linkSelfGroups.Links)
{
sectionsByLinks[new Tuple <string, string>(l, section.Number)] = linkSelfGroups;
}
}
linkSelfGroups.Add(section);
}
}
var sectionGroups = sectionsByLinks.Values.Distinct().Select(s => s.Sections).ToList();
sectionGroups.AddRange(independentSections.Select(x => new List <MyPurdueSection>()
{
x
}));
return(sectionGroups);
}
public void Absorb(LinkSections other)
{
foreach (var l in other.Links)
{
if (!Links.Contains(l))
{
Links.Add(l);
}
}
Sections.AddRange(other.Sections);
}
