public bool CreateAndLoadBuffer()
{
DestroyBuffer();
var pkg = PackageManager.Package as Package;
IServiceProvider serviceProvider = pkg;
var textLinesType = typeof(VSTextManagerInterop.IVsTextLines);
var riid = textLinesType.GUID;
var clsid = typeof(VSTextManagerInterop.VsTextBufferClass).GUID;
_underlyingBuffer = pkg.CreateInstance(ref clsid, ref riid, textLinesType);
Debug.Assert(_underlyingBuffer != null, "Failure while creating buffer.");
var buffer = _underlyingBuffer as VSTextManagerInterop.IVsTextLines;
Debug.Assert(buffer != null, "Why does buffer not implement IVsTextLines?");
var ows = buffer as IObjectWithSite;
if (ows != null)
{
ows.SetSite(serviceProvider.GetService(typeof(IOleServiceProvider)));
}
// We want to set the LanguageService SID explicitly to the XML Language Service.
// We need turn off GUID_VsBufferDetectLangSID before calling LoadDocData so that the
// TextBuffer does not do the work to detect the LanguageService SID from the file extension.
var userData = buffer as VSTextManagerInterop.IVsUserData;
if (userData != null)
{
var VsBufferDetectLangSID = new Guid("{17F375AC-C814-11d1-88AD-0000F87579D2}"); //GUID_VsBufferDetectLangSID;
VSErrorHandler.ThrowOnFailure(userData.SetData(ref VsBufferDetectLangSID, false));
}
var langSid = CommonPackageConstants.xmlEditorLanguageService;
VSErrorHandler.ThrowOnFailure(buffer.SetLanguageServiceID(ref langSid));
var persistDocData = buffer as IVsPersistDocData;
if (persistDocData != null)
{
persistDocData.LoadDocData(FileName);
var artifactUri = new Uri(FileName);
var artifact = PackageManager.Package.ModelManager.GetArtifact(artifactUri);
if (artifact != null
&& artifact.IsCodeGenArtifact)
{
var standaloneProvider = artifact.XmlModelProvider as StandaloneXmlModelProvider;
if (standaloneProvider.ExtensionErrors == null
|| standaloneProvider.ExtensionErrors.Count == 0)
{
// If there is a cached code gen artifact, it will have loaded its text buffer using extensions already.
// Therefore we can grab the text buffer from that artifact for our docdata buffer, and dispose the
// code gen artifact since it's using a XmlProvider that is standalone and won't be supported by the
// designer.
var projectItem = VsUtils.GetProjectItem(Hierarchy, ItemId);
if (projectItem != null)
{
if (VSHelpers.CheckOutFilesIfEditable(ServiceProvider, new[] { FileName }))
{
string artifactText = null;
using (var writer = new Utf8StringWriter())
{
artifact.XDocument.Save(writer, SaveOptions.None);
artifactText = writer.ToString();
}
if (!String.IsNullOrWhiteSpace(artifactText))
{
VsUtils.SetTextForVsTextLines(VsBuffer, artifactText);
}
}
else
{
ErrorListHelper.LogExtensionErrors(
new List<ExtensionError>
{
new ExtensionError(
string.Format(
CultureInfo.CurrentCulture, Resources.ExtensionError_SourceControlLock,
Path.GetFileName(FileName)),
ErrorCodes.ExtensionsError_BufferNotEditable,
ExtensionErrorSeverity.Error)
},
projectItem);
}
}
PackageManager.Package.ModelManager.ClearArtifact(artifactUri);
}
else
{
// If the extensions ran into errors whilst loading, we'll need to re-run extensions anyway so we ignore the cache
PackageManager.Package.ModelManager.ClearArtifact(artifactUri);
DispatchLoadToExtensions();
}
}
else
{
DispatchLoadToExtensions();
}
}
// DSL exposes the FileNameChanged event which we subscribe to so we can update the moniker inside
// the text buffer, which is required to update our model as well as keep the XmlModel in sync.
FileNameChanged += OnFileNameChanged;
RegisterUndoTracking();
return true;
}
internal string DispatchSaveToExtensions(
IServiceProvider serviceProvider, ProjectItem projectItem, string fileContents,
Lazy<IModelConversionExtension, IEntityDesignerConversionData>[] converters,
Lazy<IModelTransformExtension>[] serializers)
{
Debug.Assert(projectItem != null, "projectItem != null");
Debug.Assert(fileContents != null, "bufferText != null");
Debug.Assert(serializers != null && converters != null, "extensions must not be null");
Debug.Assert(serializers.Any() || converters.Any(), "at least one extension expected");
ModelTransformContextImpl transformContext = null;
ModelConversionContextImpl conversionContext = null;
try
{
var original = XDocument.Parse(fileContents, LoadOptions.PreserveWhitespace);
var targetSchemaVersion = EdmUtils.GetEntityFrameworkVersion(projectItem.ContainingProject, serviceProvider);
Debug.Assert(targetSchemaVersion != null, "we should not get here for Misc projects");
transformContext = new ModelTransformContextImpl(projectItem, targetSchemaVersion, original);
// call the extensions that can save EDMX files first (even if we aren't going to end up in an EDMX file, let them process)
VSArtifact.DispatchToSerializationExtensions(serializers, transformContext, loading: false);
// get the extension of the file being loaded (might not be EDMX); this API will include the preceeding "."
var fileInfo = new FileInfo(FileName);
var fileExtension = fileInfo.Extension;
// now if this is not an EDMX file, hand off to the extension who can convert it to the writable content
if (!string.Equals(fileExtension, EntityDesignArtifact.ExtensionEdmx, StringComparison.OrdinalIgnoreCase))
{
// the current document coming from the serializers becomes our original
conversionContext = new ModelConversionContextImpl(
projectItem.ContainingProject, projectItem, fileInfo, targetSchemaVersion, transformContext.CurrentDocument);
// we aren't loading an EDMX file, so call the extensions who can process this file extension
// when this finishes, then output should be a valid EDMX document
VSArtifact.DispatchToConversionExtensions(converters, fileExtension, conversionContext, false);
// we are done saving, so get bufferText from the OriginalDocument
// TODO use Utf8StringWriter here somehow?
return conversionContext.OriginalDocument;
}
else
{
// we are saving an EDMX file, so get bufferText from the XDocument
using (var writer = new Utf8StringWriter())
{
transformContext.CurrentDocument.Save(writer, SaveOptions.None);
return writer.ToString();
}
}
}
catch (XmlException)
{
// Don't do anything here. We will want to gracefully step out of the extension loading
// and let the core designer handle this.
return fileContents;
}
finally
{
var errorList = ErrorListHelper.GetExtensionErrorList(serviceProvider);
errorList.Clear();
// log any errors
if (conversionContext != null)
{
if (conversionContext.Errors.Count > 0)
{
ErrorListHelper.LogExtensionErrors(conversionContext.Errors, projectItem);
}
conversionContext.Dispose();
}
if (transformContext != null)
{
if (transformContext.Errors.Count > 0)
{
ErrorListHelper.LogExtensionErrors(transformContext.Errors, projectItem);
}
transformContext.Dispose();
}
}
}
internal static bool TryGetBufferViaExtensions(
IServiceProvider serviceProvider, ProjectItem projectItem, string fileContents,
Lazy<IModelConversionExtension, IEntityDesignerConversionData>[] converters,
Lazy<IModelTransformExtension>[] serializers, out string documentViaExtensions,
out List<ExtensionError> errors)
{
Debug.Assert(serviceProvider != null, "serviceProvider != null");
Debug.Assert(projectItem != null, "projectItem != null");
Debug.Assert(VsUtils.EntityFrameworkSupportedInProject(projectItem.ContainingProject, serviceProvider, false));
Debug.Assert(serializers != null && converters != null, "extensions must not be null");
Debug.Assert(serializers.Any() || converters.Any(), "at least one extension expected");
errors = new List<ExtensionError>();
documentViaExtensions = "";
ModelConversionContextImpl conversionContext = null;
ModelTransformContextImpl transformContext = null;
try
{
var targetSchemaVersion =
EdmUtils.GetEntityFrameworkVersion(projectItem.ContainingProject, serviceProvider);
Debug.Assert(targetSchemaVersion != null, "should not get here for a Misc project");
// get the extension of the file being loaded (might not be EDMX); this API will include the preceeding "."
var filePath = projectItem.get_FileNames(1);
var fileExtension = Path.GetExtension(filePath);
XDocument originalDocument = null;
// see if we are loading an EDMX file or not, and if we have any converters
if (!string.Equals(
fileExtension, EntityDesignArtifact.ExtensionEdmx,
StringComparison.OrdinalIgnoreCase))
{
conversionContext = new ModelConversionContextImpl(
projectItem.ContainingProject, projectItem, new FileInfo(filePath),
targetSchemaVersion, fileContents);
// we aren't loading an EDMX file, so call the extensions who can process this file extension
// when this finishes, then output should be a valid EDMX document
VSArtifact.DispatchToConversionExtensions(converters, fileExtension, conversionContext, true);
// we are done with the non-EDMX extensions so CurrentDocument will be a valid EDMX document
// create the serialization context for further extensions to act on
transformContext = new ModelTransformContextImpl(
projectItem, targetSchemaVersion, conversionContext.CurrentDocument);
}
else
{
// we are loading an EDMX file, we can parse file contents into an XDocument
try
{
originalDocument = XDocument.Parse(fileContents, LoadOptions.PreserveWhitespace);
transformContext = new ModelTransformContextImpl(
projectItem, targetSchemaVersion, originalDocument);
}
catch (XmlException)
{
// If there's an error here, don't do anything. We will want to gracefully step out of the extension loading
// since the designer itself won't load.
}
}
if (transformContext != null
&& originalDocument != null)
{
// now dispatch to those that want to work on EDMX files
VSArtifact.DispatchToSerializationExtensions(serializers, transformContext, true);
// TODO: this does not seem to be correct if severity is Message or Warning
if (transformContext.Errors.Count == 0)
{
// see if any extension changed things. Note that we need to compare the serialization of
// the XDocuments together since the original buffer may have different whitespace after creating the XDocument.
// TODO: Why not use XNode.DeepEquals()?
string newBufferContents;
using (var currentDocWriter = new Utf8StringWriter())
{
transformContext.CurrentDocument.Save(currentDocWriter, SaveOptions.None);
newBufferContents = currentDocWriter.ToString();
}
string originalBufferContents;
using (var originalDocWriter = new Utf8StringWriter())
{
originalDocument.Save(originalDocWriter, SaveOptions.None);
originalBufferContents = originalDocWriter.ToString();
}
if (!string.Equals(originalBufferContents, newBufferContents, StringComparison.Ordinal))
{
documentViaExtensions = newBufferContents;
return true;
}
}
else
{
errors.AddRange(transformContext.Errors);
return false;
}
}
}
finally
{
var errorList = ErrorListHelper.GetExtensionErrorList(serviceProvider);
errorList.Clear();
// log any errors
if (conversionContext != null
&& conversionContext.Errors.Count > 0)
{
ErrorListHelper.LogExtensionErrors(conversionContext.Errors, projectItem);
}
if (transformContext != null
&& transformContext.Errors.Count > 0)
{
ErrorListHelper.LogExtensionErrors(transformContext.Errors, projectItem);
}
}
return false;
}