protected virtual IImageMimeTypeProcessor GetMimeTypeProcessor(ImageStreamingContext context)
{
string responseContentType = context.ContentType;
if (String.IsNullOrEmpty(responseContentType))
{
if (context.IsMultiFrame)
{
responseContentType = "application/dicom";
}
else
{
responseContentType = "image/jpeg";
if (!ClientAcceptable(context, responseContentType))
{
responseContentType = "application/dicom";
}
}
}
if (_processorMap.ContainsKey(context.ContentType))
{
return((IImageMimeTypeProcessor)Activator.CreateInstance(_processorMap[context.ContentType]));
}
ImageMimeTypeProcessorExtensionPoint xp = new ImageMimeTypeProcessorExtensionPoint();
object[] plugins = xp.CreateExtensions();
bool found = false;
foreach (IImageMimeTypeProcessor mimeTypeConverter in plugins)
{
if (mimeTypeConverter.OutputMimeType == responseContentType)
{
found = true;
_processorMap.Add(context.ContentType, mimeTypeConverter.GetType());
if (ClientAcceptable(context, mimeTypeConverter.OutputMimeType))
{
return(mimeTypeConverter);
}
}
}
if (found)
{
throw new WADOException(HttpStatusCode.NotAcceptable,
String.Format("{0} is supported but is not acceptable by the client", responseContentType));
}
else
{
throw new WADOException(HttpStatusCode.BadRequest,
String.Format("The specified contentType '{0}' is not supported", responseContentType));
}
}
public WADOResponse Process(WADORequestTypeHandlerContext context)
{
Platform.CheckForNullReference(context, "httpContext");
Platform.CheckForNullReference(context.ServerAE, "context.ServerAE");
Platform.CheckForNullReference(context.HttpContext, "context.HttpContext");
// Cache the query string for performance purpose. Every time Request.QueryString is called, .NET will rebuild the entire dictionary.
NameValueCollection query = context.HttpContext.Request.QueryString;
ServerPartition partition = ServerPartitionMonitor.Instance.GetPartition(context.ServerAE);
if (partition == null)
{
throw new WADOException(HttpStatusCode.NotFound, String.Format(SR.FaultPartitionNotExists, context.ServerAE));
}
if (!partition.Enabled)
{
throw new WADOException(HttpStatusCode.Forbidden, String.Format(SR.FaultPartitionDisabled, context.ServerAE));
}
ImageStreamingContext streamingContext = new ImageStreamingContext(context.HttpContext);
streamingContext.ServerAE = context.ServerAE;
streamingContext.ContentType = query["ContentType"];
streamingContext.AcceptTypes = context.HttpContext.Request.AcceptTypes;
streamingContext.StudyInstanceUid = query["studyuid"];
streamingContext.SeriesInstanceUid = query["seriesuid"];
streamingContext.ObjectUid = query["objectuid"];
string sessionId = context.HttpContext.Request.RemoteEndPoint.Address.ToString();
StudyStorageLoader storageLoader = new StudyStorageLoader(sessionId);
storageLoader.CacheEnabled = ImageStreamingServerSettings.Default.EnableCache;
storageLoader.CacheRetentionTime = ImageStreamingServerSettings.Default.CacheRetentionWindow;
streamingContext.StorageLocation = storageLoader.Find(streamingContext.StudyInstanceUid, partition);
// convert the dicom image into the appropriate mime type
WADOResponse response = new WADOResponse();
IImageMimeTypeProcessor processor = GetMimeTypeProcessor(streamingContext);
MimeTypeProcessorOutput output = processor.Process(streamingContext);
response.Output = output.Output;
response.ContentType = output.ContentType;
response.IsLast = output.IsLast;
return(response);
}
protected static bool ClientAcceptable(ImageStreamingContext context, string contentType)
{
if (context.AcceptTypes == null)
{
return(false);
}
foreach (string rawmime in context.AcceptTypes)
{
string mime = rawmime;
if (rawmime.Contains(";"))
{
mime = rawmime.Substring(0, rawmime.IndexOf(";"));
}
if (mime == "*/*" || mime == contentType)
{
return(true);
}
}
return(false);
}
internal PixelDataLoader(ImageStreamingContext context)
{
_context = context;
}
