public static string FindMapReduceIndexName(string[] collections, IReadOnlyCollection <IndexField> fields,
IReadOnlyCollection <IndexField> groupBy)
{
if (groupBy == null)
{
throw new ArgumentNullException(nameof(groupBy));
}
var reducedByFields = string.Join("And", groupBy.Select(x => IndexField.ReplaceInvalidCharactersInFieldName(x.Name)).OrderBy(x => x));
return($"{FindName(collections, fields)}ReducedBy{reducedByFields}");
}
private static string FindName(string[] collections, IReadOnlyCollection <IndexField> fields)
{
foreach (var collection in collections.Where(string.IsNullOrEmpty))
{
throw new ArgumentNullException(nameof(collection));
}
if (fields == null)
{
throw new ArgumentNullException(nameof(fields));
}
var joinedCollections = string.Join("And", collections.Select(x => x == Constants.Indexing.AllDocumentsCollection ? "AllDocs" : x));
if (fields.Count == 0)
{
return($"Auto/{joinedCollections}");
}
var combinedFields = string.Join("And", fields.Select(x => IndexField.ReplaceInvalidCharactersInFieldName(x.Name)).OrderBy(x => x));
var sortOptions = fields.Where(x => x.SortOption != null).Select(x => IndexField.ReplaceInvalidCharactersInFieldName(x.Name)).ToArray();
if (sortOptions.Length > 0)
{
combinedFields = $"{combinedFields}SortBy{string.Join(string.Empty, sortOptions.OrderBy(x => x))}";
}
var highlighted = fields.Where(x => x.Highlighted).Select(x => IndexField.ReplaceInvalidCharactersInFieldName(x.Name)).ToArray();
if (highlighted.Length > 0)
{
combinedFields = $"{combinedFields}Highlight{string.Join(string.Empty, highlighted.OrderBy(x => x))}";
}
string formattableString = $"Auto/{joinedCollections}/By{combinedFields}";
if (formattableString.Length > 256)
{
var shorterString = formattableString.Substring(0, 256) + "..." +
Hashing.XXHash64.Calculate(formattableString, Encoding.UTF8);
return(shorterString);
}
return(formattableString);
}