SiteOfOriginPart.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / AppModel / SiteOfOriginPart.cs / 1305600 / 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. All rights reserved.
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SiteOfOriginPart.cs source code in C# .NET

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