protected override void OnValidate()

in src/Microsoft.Azure.NotificationHubs/GcmCredential.cs [108:143]
33 lines of code
16 McCabe index (conditional complexity)

        protected override void OnValidate(bool allowLocalMockPns)
        {
            if (this.Properties == null || this.Properties.Count > 2)
            {
                throw new InvalidDataContractException(SRClient.GcmRequiredProperties);
            }

            if (this.Properties.Count < 1 || string.IsNullOrWhiteSpace(this.GoogleApiKey))
            {
                throw new InvalidDataContractException(SRClient.GoogleApiKeyNotSpecified);
            }

            if (this.Properties.Count == 2 && string.IsNullOrEmpty(this["GcmEndpoint"]))
            {
                throw new InvalidDataContractException(SRClient.GcmEndpointNotSpecified);
            }

            if (!Uri.TryCreate(this.GcmEndpoint, UriKind.Absolute, out Uri result) ||
                !string.Equals(this.GcmEndpoint, "https://android.googleapis.com/gcm/send",
                    StringComparison.OrdinalIgnoreCase) &&
                !string.Equals(this.GcmEndpoint, "http://pushtestservice.cloudapp.net/gcm/send",
                    StringComparison.OrdinalIgnoreCase) &&
                (!string.Equals(this.GcmEndpoint, "http://pushtestservice4.cloudapp.net/gcm/send",
                     StringComparison.OrdinalIgnoreCase) &&
                 !string.Equals(this.GcmEndpoint, "http://pushperfnotificationserver.cloudapp.net/gcm/send",
                     StringComparison.OrdinalIgnoreCase)) &&
                (!string.Equals(this.GcmEndpoint, "http://pushstressnotificationserver.cloudapp.net/gcm/send",
                     StringComparison.OrdinalIgnoreCase) &&
                 !string.Equals(this.GcmEndpoint, "http://pushnotificationserver.cloudapp.net/gcm/send",
                     StringComparison.OrdinalIgnoreCase) && (!allowLocalMockPns || !string.Equals(this.GcmEndpoint,
                                                                 "http://localhost:8450/gcm/send",
                                                                 StringComparison.OrdinalIgnoreCase))))
            {
                throw new InvalidDataContractException(SRClient.InvalidGcmEndpoint);
            }
        }