Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / AppModel / SiteOfOriginPart.cs / 2 / SiteOfOriginPart.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // SiteOfOriginPart is an implementation of the abstract PackagePart class. It contains an override for GetStreamCore. // // History: // 6/16/2005: [....] - Initial creation. // //----------------------------------------------------------------------------- using System; using System.Net; using System.IO.Packaging; using System.Windows; using System.Windows.Navigation; using System.Windows.Resources; using System.IO; using System.Resources; using System.Globalization; using MS.Internal.PresentationCore; namespace MS.Internal.AppModel { ////// SiteOfOriginPart is an implementation of the abstract PackagePart class. It contains an override for GetStreamCore. /// internal class SiteOfOriginPart : System.IO.Packaging.PackagePart { //----------------------------------------------------- // // Public Constructors // //----------------------------------------------------- #region Public Constructors internal SiteOfOriginPart(Package container, Uri uri) : base(container, uri) { } #endregion //------------------------------------------------------ // // Protected Methods // //----------------------------------------------------- #region Protected Methods protected override Stream GetStreamCore(FileMode mode, FileAccess access) { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginPart: Getting stream."); #endif return GetStreamAndSetContentType(false); } protected override string GetContentTypeCore() { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginPart: Getting content type."); #endif GetStreamAndSetContentType(true); return _contentType.ToString(); } #endregion //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods private Stream GetStreamAndSetContentType(bool onlyNeedContentType) { lock (_globalLock) { if (onlyNeedContentType && _contentType != MS.Internal.ContentType.Empty) { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginPart: Getting content type and using previously determined value"); #endif return null; } // If GetContentTypeCore is called before GetStream() // then we need to retrieve the stream to get the mime type. // That stream is then stored as _cacheStream and returned // the next time GetStreamCore() is called. if (_cacheStream != null) { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + "SiteOfOriginPart: Using Cached stream"); #endif Stream temp = _cacheStream; _cacheStream = null; return temp; } if (_absoluteLocation == null) { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginPart: Determining absolute uri for this resource"); #endif string original = Uri.ToString(); Invariant.Assert(original[0] == '/'); string uriMinusInitialSlash = original.Substring(1); // trim leading '/' _absoluteLocation = new Uri(SiteOfOriginContainer.SiteOfOrigin, uriMinusInitialSlash); } #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginPart: Making web request to " + _absoluteLocation); #endif // For performance reasons it is better to open local files directly // rather than make a FileWebRequest. Stream responseStream; if (SecurityHelper.AreStringTypesEqual(_absoluteLocation.Scheme, Uri.UriSchemeFile)) { responseStream = HandleFileSource(onlyNeedContentType); } else { responseStream = HandleWebSource(onlyNeedContentType); } return responseStream; } } private Stream HandleFileSource(bool onlyNeedContentType) { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": Opening local file " + _absoluteLocation); #endif if (_contentType == MS.Internal.ContentType.Empty) { _contentType = MS.Internal.MimeTypeMapper.GetMimeTypeFromUri(Uri); } if (!onlyNeedContentType) { return File.OpenRead(_absoluteLocation.LocalPath); } return null; } private Stream HandleWebSource(bool onlyNeedContentType) { WebResponse response = WpfWebRequestHelper.CreateRequestAndGetResponse(_absoluteLocation); Stream responseStream = response.GetResponseStream(); #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": Successfully retrieved stream from " + _absoluteLocation); #endif if (_contentType == MS.Internal.ContentType.Empty) { #if DEBUG if (SiteOfOriginContainer._traceSwitch.Enabled) System.Diagnostics.Trace.TraceInformation( DateTime.Now.ToLongTimeString() + " " + DateTime.Now.Millisecond + " " + System.Threading.Thread.CurrentThread.ManagedThreadId + ": SiteOfOriginPart: Setting _contentType"); #endif _contentType = WpfWebRequestHelper.GetContentType(response); } if (onlyNeedContentType) { _cacheStream = responseStream; } return responseStream; } #endregion //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Members Uri _absoluteLocation = null; ContentType _contentType = MS.Internal.ContentType.Empty; Stream _cacheStream = null; private Object _globalLock = new Object(); #endregion Private Members } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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