/// <summary>
/// Compares otherTerm's labels with this term's labels to see if there are any conflicts.
/// A conflict occurs if the default labels (i.e. term names) are equal for a given language LCID.
/// Note that we compare all LCIDs from both terms; if a term does not have a default label
/// for a given LCID, then we fallback to the default language. (Recall that the "term name"
/// is the "default label" for each language, and there is also a "default language" for
/// the term store.)
///
/// This check can also consider a proposedNewLabelForOtherTerm, which allows us to detect
/// problems that would be introduced by adding/changing the otherTerm, before the change
/// is performed.
/// </summary>
/// <returns>
/// An "objection" (i.e. error message) if there is a conflict, or null otheriwse.
/// </returns>
internal string ExplainHasLabelConflictWith(LocalTerm otherTerm, LocalTermLabel proposedNewLabelForOtherTerm = null)
{
Debug.Assert(this.TermKind == LocalTermKind.NormalTerm);
Debug.Assert(otherTerm.TermKind == LocalTermKind.NormalTerm);
// The proposedNewLabelForOtherTerm only affects this comparison if it is the default label for a language
// (i.e. we don't care about synonyms)
if (proposedNewLabelForOtherTerm != null && !proposedNewLabelForOtherTerm.IsDefault)
{
proposedNewLabelForOtherTerm = null;
}
SharedData thisSharedData = this.GetSharedDataFromSourceTerm(exceptionIfMissing: true);
SharedData otherSharedData = otherTerm.GetSharedDataFromSourceTerm(exceptionIfMissing: true);
foreach (int lcid in
// Take the union of the LCIDs from both terms, sorted in increasing order,
// but compare the default language first
new[] { this.DefaultLanguageLcid }
.Union(
thisSharedData.LabelsByLcid.Keys
.Union(otherSharedData.LabelsByLcid.Keys)
.Where(x => x != this.DefaultLanguageLcid)
.OrderBy(x => x)
.Distinct()
))
{
string thisName = this.GetNameWithDefault(lcid);
string otherName = otherTerm.GetNameWithDefaultForConflict(otherSharedData, lcid, proposedNewLabelForOtherTerm);
if (thisName.Equals(otherName, StringComparison.OrdinalIgnoreCase))
{
return("The term name \"" + otherName + "\" is already in use by a sibling term"
+ " (LCID=" + lcid + ")");
}
}
return(null);
}
