public IEnumerable <HtmlTag> Build(AssetTagPlan plan)
{
// This will happen when a user tries to request an asset set
// with no assets -- think optional sets
if (!plan.Subjects.Any())
{
return(new HtmlTag[0]);
}
IEnumerable <MissingAssetTagSubject> missingSubjects = plan.RemoveMissingAssets();
Func <IAssetTagSubject, string, HtmlTag> func = _builders[plan.MimeType];
Func <IAssetTagSubject, HtmlTag> builder = s => {
string url = _urls.UrlForAsset(s.Folder, s.Name);
return(func(s, url));
};
IEnumerable <HtmlTag> missingTags = _missingHandler.BuildTagsAndRecord(missingSubjects);
IEnumerable <HtmlTag> assetTags = plan.Subjects.Select(builder);
return(missingTags.Union(assetTags));
}
