/// <summary>
/// Finds related tags given the specified <see cref="HierarchyRelation"/>.
/// </summary>
/// <param name="tag">The tag for which to fetch relations.</param>
/// <param name="relation">The hierarchy relation to look-up.</param>
/// <returns>The set of tags requested.</returns>
public ImmutableHashSet <string> GetRelatedTags(string tag, HierarchyRelation relation)
{
tag = this.Rename(tag);
var tags = ImmutableHashSet <string> .Empty;
switch (relation)
{
case HierarchyRelation.Ancestor:
case HierarchyRelation.SelfOrAncestor:
tags = tags.Union(this.GetTagAncestors(tag));
if (relation == HierarchyRelation.SelfOrAncestor)
{
goto case HierarchyRelation.Self;
}
break;
case HierarchyRelation.Descendant:
case HierarchyRelation.SelfOrDescendant:
tags = tags.Union(this.GetTagDescendants(tag));
if (relation == HierarchyRelation.SelfOrDescendant)
{
goto case HierarchyRelation.Self;
}
break;
case HierarchyRelation.Self:
tags = tags.Add(tag);
break;
}
return(tags);
}
/// <summary>
/// Finds related tags given the specified <see cref="HierarchyRelation"/>.
/// </summary>
/// <param name="relation">The hierarchy relation to look-up.</param>
/// <returns>The set of tags requested.</returns>
public ImmutableHashSet <string> RelatedTags(HierarchyRelation relation)
{
var tags = ImmutableHashSet <string> .Empty;
switch (relation)
{
case HierarchyRelation.Ancestor:
case HierarchyRelation.SelfOrAncestor:
tags = tags.Union(this.Ancestors);
if (relation == HierarchyRelation.SelfOrAncestor)
{
goto case HierarchyRelation.Self;
}
break;
case HierarchyRelation.Descendant:
case HierarchyRelation.SelfOrDescendant:
tags = tags.Union(this.Descendants);
if (relation == HierarchyRelation.SelfOrDescendant)
{
goto case HierarchyRelation.Self;
}
break;
case HierarchyRelation.Self:
tags = tags.Add(this.Tag);
break;
}
return(tags);
}