ElementFactory.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / FontCache / ElementFactory.cs / 1 / ElementFactory.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Diagnostics; 
using System.IO;
using System.Net; 
using System.Security;

using MS.Internal.PresentationCore;
 
// Since we disable PreSharp warnings in this file, we first need to disable warnings about unknown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691 
 
// Disable PreSharp warning about empty catch bodies.
// We have many situations in this file where the service needs to robust against external data, 
// and empty catch bodies allow for uniform error handling code paths.
#pragma warning disable 6502

namespace MS.Internal.FontCache 
{
    /// 
    ///     Critical - The class is used by the server to construct font cache elements. 
    /// It is unaware of what method will be used to communicate the data to the server.
    /// 
    [SecurityCritical(SecurityCriticalScope.Everything)]
    [FriendAccessAllowed]
    internal static class ElementFactory
    { 
        /// 
        /// Creates an element from a miss report key.  Checks for errors in element construction 
        /// that could arise if either key or font file is corrupt.  Returns the element if successful 
        /// or null to indicate an error.
        ///  
        internal static IFontCacheElement CreateElementFromKey(int type, CheckedPointer key)
        {
            try
            { 
                switch (type)
                { 
                    case 2: 
                        return new FamilyCollection(key);
                    case 3: 
                        return new FontFaceLayoutInfo(key);
                    case 1:
                        return new GlyphBitmapElement(key);
                    case 4: 
                        return new GlyphPathElement(key);
                    default: 
                        return null; 
                }
            } 
            catch (ArgumentOutOfRangeException)
            {
                // The cache element key is malformed.
            } 
            catch (UriFormatException)
            { 
                // Font file Uri is malformed. 
            }
            catch (IOException) 
            {
                // Font file doesn't exist or cannot be read due to an I/O error.
            }
            catch (UnauthorizedAccessException) 
            {
                // Font file cannot be accessed by the service account. 
            } 
            catch (WebException)
            { 
                //This error can happen if the miss report specifies a web address for the font file.
                //(This is not a subclass of I/O exception).
            }
            return null; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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