PrintingPermission.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Printing / PrintingPermission.cs / 1 / PrintingPermission.cs
                        
                        
                            /* 
 * Copyright (c) 2000 Microsoft Corporation.  All Rights Reserved.
 * Microsoft Confidential.
 */
 
namespace System.Drawing.Printing {
    using System; 
    using System.Security; 
    using System.Security.Permissions;
    using System.IO; 
    using System.Runtime.Serialization;
    using System.Reflection;
    using System.Collections;
    using System.Globalization; 
    using System.Diagnostics.CodeAnalysis;
 
    ///  
    /// 
    ///     Controls the ability to use the printer. This class cannot be inherited. 
    /// 
    [Serializable]
    public sealed class PrintingPermission : CodeAccessPermission, IUnrestrictedPermission {
        private PrintingPermissionLevel printingLevel; 

        ///  
        ///  
        /// Initializes a new instance of the PrintingPermission class with either fully restricted
        ///    or unrestricted access, as specified. 
        /// 
        public PrintingPermission(PermissionState state) {
            if (state == PermissionState.Unrestricted) {
                printingLevel = PrintingPermissionLevel.AllPrinting; 
            }
            else if (state == PermissionState.None) { 
                printingLevel = PrintingPermissionLevel.NoPrinting; 
            }
            else { 
                throw new ArgumentException(SR.GetString(SR.InvalidPermissionState));
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public PrintingPermission(PrintingPermissionLevel printingLevel) { 
            VerifyPrintingLevel(printingLevel);

            this.printingLevel = printingLevel;
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public PrintingPermissionLevel Level {
            get {
                return printingLevel;
            } 

            set { 
                VerifyPrintingLevel(value); 
                printingLevel = value;
            } 
        }

        private static void VerifyPrintingLevel(PrintingPermissionLevel level) {
            if (level < PrintingPermissionLevel.NoPrinting || level > PrintingPermissionLevel.AllPrinting) { 
                throw new ArgumentException(SR.GetString(SR.InvalidPermissionLevel));
            } 
        } 

 
        //------------------------------------------------------
        //
        // CODEACCESSPERMISSION IMPLEMENTATION
        // 
        //-----------------------------------------------------
 
        ///  
        /// 
        ///     Gets a 
        ///       value indicating whether permission is unrestricted.
        /// 
        public bool IsUnrestricted() {
            return printingLevel == PrintingPermissionLevel.AllPrinting; 
        }
 
        //----------------------------------------------------- 
        //
        // IPERMISSION IMPLEMENTATION 
        //
        //-----------------------------------------------------

        ///  
        /// 
        ///    Determines whether the current permission object is a subset of 
        ///       the specified permission. 
        /// 
        public override bool IsSubsetOf(IPermission target) { 
            if (target == null) {
                return printingLevel == PrintingPermissionLevel.NoPrinting;
            }
 
            PrintingPermission operand = target as PrintingPermission;
            if(operand == null) { 
                throw new ArgumentException(SR.GetString(SR.TargetNotPrintingPermission)); 
            }
            return this.printingLevel <= operand.printingLevel; 
        }

        /// 
        ///  
        ///    Creates and returns a permission that is the intersection of the current
        ///       permission object and a target permission object. 
        ///  
        public override IPermission Intersect(IPermission target) {
            if (target == null) { 
                return null;
            }

            PrintingPermission operand = target as PrintingPermission; 
            if(operand == null) {
                throw new ArgumentException(SR.GetString(SR.TargetNotPrintingPermission)); 
            } 
            PrintingPermissionLevel isectLevels = printingLevel < operand.printingLevel ? printingLevel : operand.printingLevel;
            if (isectLevels == PrintingPermissionLevel.NoPrinting) 
                return null;
            else
                return new PrintingPermission(isectLevels);
        } 

        ///  
        ///  
        ///    Creates a permission that is the union of the permission object
        ///       and the target parameter permission object. 
        /// 
        public override IPermission Union(IPermission target) {
            if (target == null) {
                return this.Copy(); 
            }
 
            PrintingPermission operand = target as PrintingPermission; 
            if(operand == null) {
                throw new ArgumentException(SR.GetString(SR.TargetNotPrintingPermission)); 
            }
            PrintingPermissionLevel isectLevels = printingLevel > operand.printingLevel ? printingLevel : operand.printingLevel;
            if (isectLevels == PrintingPermissionLevel.NoPrinting)
                return null; 
            else
                return new PrintingPermission(isectLevels); 
        } 

        ///  
        /// 
        ///    Creates and returns an identical copy of the current permission
        ///       object.
        ///  
        [SuppressMessage("Microsoft.Security", "CA2103:ReviewImperativeSecurity")]
        public override IPermission Copy() { 
            return new PrintingPermission(this.printingLevel); 
        }
 

        /// 
        /// 
        ///    Creates an XML encoding of the security object and its current 
        ///       state.
        ///  
        public override SecurityElement ToXml() { 
            SecurityElement securityElement = new SecurityElement("IPermission");
 
            securityElement.AddAttribute("class", this.GetType().FullName + ", " + this.GetType().Module.Assembly.FullName.Replace('\"', '\''));
            securityElement.AddAttribute("version", "1");
            if (!IsUnrestricted()) {
                securityElement.AddAttribute("Level", Enum.GetName(typeof(PrintingPermissionLevel), printingLevel)); 
            }
            else { 
                securityElement.AddAttribute("Unrestricted", "true"); 
            }
            return securityElement; 
        }

        /// 
        ///  
        ///    Reconstructs a security object with a specified state from an XML
        ///       encoding. 
        ///  
        [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")]
        public override void FromXml(SecurityElement esd) { 
            if (esd == null) {
                throw new ArgumentNullException("esd");
            }
 
            String className = esd.Attribute("class");
 
            if (className == null || className.IndexOf(this.GetType().FullName) == -1) { 
                throw new ArgumentException(SR.GetString(SR.InvalidClassName));
            } 

            String unrestricted = esd.Attribute("Unrestricted");

            if (unrestricted != null && String.Equals(unrestricted, "true", StringComparison.OrdinalIgnoreCase)) 
            {
                printingLevel = PrintingPermissionLevel.AllPrinting; 
                return; 
            }
 
            printingLevel = PrintingPermissionLevel.NoPrinting;

            String printing = esd.Attribute("Level");
 
            if (printing != null)
            { 
                printingLevel = (PrintingPermissionLevel)Enum.Parse(typeof(PrintingPermissionLevel), printing); 
            }
        } 
    }
}

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

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