public static async Task DownloadAndStore()

in code/OBADownload/Components/DownloadRegionsList.cs [27:75]
39 lines of code
9 McCabe index (conditional complexity)

        public static async Task<RegionsList> DownloadAndStore(Client obaClient, StorageManager downloadStorage, StorageManager downloadMetadataStorage, string runId)
        {
            // check inputs
            if (obaClient == null)
            {
                throw new ArgumentNullException("obaClient");
            }
            else if (downloadStorage == null)
            {
                throw new ArgumentNullException("downloadStorage");
            }
            else if (downloadMetadataStorage == null)
            {
                throw new ArgumentNullException("downloadMetadataStorage");
            }
            else if (string.IsNullOrWhiteSpace(runId))
            {
                throw new ArgumentNullException("runId");
            }

            // fetch the regions list
            RegionsList regionsList = await obaClient.GetAllRegionsAsync();

            // check the regions list
            if (regionsList == null)
            {
                throw new Exception("regions list is null");
            }
            else if (regionsList.Regions == null)
            {
                throw new Exception("regions in regions list is null");
            }
            else if (regionsList.Regions.Count <= 0)
            {
                throw new Exception("regions in regions list is empty");
            }
            else if (string.IsNullOrWhiteSpace(regionsList.RegionsRawContent))
            {
                throw new Exception("raw content in regions list is empty");
            }

            // store it
            await downloadStorage.RegionsListStore.Insert(regionsList);

            // add a metadata entry
            await downloadMetadataStorage.DownloadMetadataStore.Insert(runId, string.Empty, string.Empty, RecordType.RegionsList, 1);

            return regionsList;
        }