UserUseLicenseDictionaryLoader.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Packaging / CompoundFile / UserUseLicenseDictionaryLoader.cs / 1305600 / UserUseLicenseDictionaryLoader.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//  This class is a helper to load a set of associations between a user and the use license 
//  granted to that user.
// 
// History:
//  04/19/2005: LGolding:   Initial implementation.
//  03/08/2006: IgorBel:   switch from a dictionary to a Load helper
// 
//
//----------------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.IO; 
using System.IO.Packaging;
using System.Windows; 
using System.Security.RightsManagement; 

using MS.Internal; 

namespace MS.Internal.IO.Packaging.CompoundFile
{
    internal class UserUseLicenseDictionaryLoader 
    {
        //----------------------------------------------------- 
        // 
        // Constructors
        // 
        //-----------------------------------------------------

        #region Constructors
 
        /// 
        /// Constructor. 
        ///  
        internal UserUseLicenseDictionaryLoader(RightsManagementEncryptionTransform rmet)
        { 
            _dict = new Dictionary(ContentUser._contentUserComparer);

            //
            // This constructor is only called from RightsManagementEncryptionTransform 
            // .GetEmbeddedUseLicenses. That method passes "this" as the parameter.
            // So it can't possibly be null. 
            // 
            Invariant.Assert(rmet != null);
 
            Load(rmet);
        }

        #endregion Constructors 

        //------------------------------------------------------ 
        // 
        // Internal Properties
        // 
        //-----------------------------------------------------

        #region Internal Properties
        internal Dictionary LoadedDictionary 
        {
            get 
            { 
                return _dict;
            } 
        }

        #endregion Internal Properties
 
        //------------------------------------------------------
        // 
        // Private Methods 
        //
        //------------------------------------------------------ 

        #region Private Methods

        ///  
        /// Load the contents of the dictionary from the compound file.
        ///  
        ///  
        /// The object that knows how to load use license data from the compound file.
        ///  
        /// 
        /// If  is null.
        /// 
        private void Load(RightsManagementEncryptionTransform rmet ) 
        {
            rmet.EnumUseLicenseStreams( 
                    new RightsManagementEncryptionTransform.UseLicenseStreamCallback( 
                            this.AddUseLicenseFromStreamToDictionary
                            ), 
                    null
                    );
        }
 
        /// 
        /// Callback function used by Load. Called once for each use license stream 
        /// in the compound file. Extracts the user and use license from the specified 
        /// stream.
        ///  
        /// 
        /// The object that knows how to extract license information from the compound file.
        /// 
        ///  
        /// The stream containing the user/user license pair to be added to the dictionary.
        ///  
        ///  
        /// Caller-supplied parameter to EnumUseLicenseStreams. Not used.
        ///  
        /// 
        /// Set to true if the callback function wants to stop the enumeration. This callback
        /// function never wants to stop the enumeration, so this parameter is not used.
        ///  
        private void
        AddUseLicenseFromStreamToDictionary( 
            RightsManagementEncryptionTransform rmet, 
            StreamInfo si,
            object param, 
            ref bool stop
            )
        {
            ContentUser user; 
            using (Stream stream = si.GetStream(FileMode.Open, FileAccess.Read))
            { 
                using(BinaryReader utf8Reader = new BinaryReader(stream, _utf8Encoding)) 
                {
                    UseLicense useLicense = rmet.LoadUseLicenseAndUserFromStream(utf8Reader, out user); 

                    _dict.Add(user, useLicense);
                }
            } 
        }
 
        #endregion Private Methods 

        //----------------------------------------------------- 
        //
        // Private Fields
        //
        //------------------------------------------------------ 

        #region Private Fields 
 
        //
        // The object that provides the implementation of the IDictionary methods. 
        //
        private Dictionary _dict;

        // 
        // Text encoding object used to read or write publish licenses and use licenses.
        // 
        private UTF8Encoding _utf8Encoding = new UTF8Encoding(); 

        #endregion Private Fields 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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UserUseLicenseDictionaryLoader.cs source code in C# .NET

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