public static VectorStoreCollectionPageToken FromToken()

in src/Custom/VectorStores/Internal/Pagination/VectorStoreCollectionPageToken.cs [65:129]
54 lines of code
9 McCabe index (conditional complexity)

    public static VectorStoreCollectionPageToken FromToken(ContinuationToken pageToken)
    {
        if (pageToken is VectorStoreCollectionPageToken token)
        {
            return token;
        }

        BinaryData data = pageToken.ToBytes();

        if (data.ToMemory().Length == 0)
        {
            throw new ArgumentException("Failed to create VectorStoresPageToken from provided pageToken.", nameof(pageToken));
        }

        Utf8JsonReader reader = new(data);

        int? limit = null;
        string? order = null;
        string? after = null;
        string? before = null;

        reader.Read();

        Debug.Assert(reader.TokenType == JsonTokenType.StartObject);

        while (reader.Read())
        {
            if (reader.TokenType == JsonTokenType.EndObject)
            {
                break;
            }

            Debug.Assert(reader.TokenType == JsonTokenType.PropertyName);

            string propertyName = reader.GetString()!;

            switch (propertyName)
            {
                case "limit":
                    reader.Read();
                    Debug.Assert(reader.TokenType == JsonTokenType.Number);
                    limit = reader.GetInt32();
                    break;
                case "order":
                    reader.Read();
                    Debug.Assert(reader.TokenType == JsonTokenType.String);
                    order = reader.GetString();
                    break;
                case "after":
                    reader.Read();
                    Debug.Assert(reader.TokenType == JsonTokenType.String);
                    after = reader.GetString();
                    break;
                case "before":
                    reader.Read();
                    Debug.Assert(reader.TokenType == JsonTokenType.String);
                    before = reader.GetString();
                    break;
                default:
                    throw new JsonException($"Unrecognized property '{propertyName}'.");
            }
        }

        return new(limit, order, after, before);
    }