ResourceAttributes.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Runtime / Versioning / ResourceAttributes.cs / 1 / ResourceAttributes.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Purpose: Resource annotation rules. 
**
===========================================================*/ 

using System;
using System.Diagnostics;
using Microsoft.Win32; 

namespace System.Runtime.Versioning 
{ 
    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Constructor, Inherited = false)]
    [Conditional("RESOURCE_ANNOTATION_WORK")] 
    public sealed class ResourceConsumptionAttribute : Attribute
 	{
        private ResourceScope _consumptionScope;
        private ResourceScope _resourceScope; 

        public ResourceConsumptionAttribute(ResourceScope resourceScope) 
        { 
            _resourceScope = resourceScope;
            _consumptionScope = _resourceScope; 
        }

        public ResourceConsumptionAttribute(ResourceScope resourceScope, ResourceScope consumptionScope)
        { 
            _resourceScope = resourceScope;
            _consumptionScope = consumptionScope; 
        } 

        public ResourceScope ResourceScope { 
            get { return _resourceScope; }
        }

        public ResourceScope ConsumptionScope { 
            get { return _consumptionScope; }
        } 
    } 

    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Constructor, Inherited = false)] 
    [Conditional("RESOURCE_ANNOTATION_WORK")]
    public sealed class ResourceExposureAttribute : Attribute
    {
        private ResourceScope _resourceExposureLevel; 

        public ResourceExposureAttribute(ResourceScope exposureLevel) 
        { 
            _resourceExposureLevel = exposureLevel;
        } 

        public ResourceScope ResourceExposureLevel {
            get { return _resourceExposureLevel; }
        } 
    }
 
 
    // Default visibility is Public, which isn't specified in this enum.
    // Public == the lack of Private or Assembly 
    // Does this actually work?  Need to investigate that.
    [Flags]
    public enum ResourceScope
    { 
        None = 0,
        // Resource type 
        Machine   = 0x1, 
        Process   = 0x2,
        AppDomain = 0x4, 
        Library   = 0x8,
        // Visibility
        Private  = 0x10,  // Private to this one class.
        Assembly = 0x20,  // Assembly-level, like C#'s "internal" 
    }
 
 
    [Flags]
    internal enum SxSRequirements 
    {
        None = 0,
        AppDomainID = 0x1,
        ProcessID = 0x2, 
        AssemblyName = 0x4,
        TypeName = 0x8 
    } 

    public static class VersioningHelper 
    {
        // These depend on the exact values given to members of the ResourceScope enum.
        private static ResourceScope ResTypeMask = ResourceScope.Machine | ResourceScope.Process | ResourceScope.AppDomain | ResourceScope.Library;
        private static ResourceScope VisibilityMask = ResourceScope.Private | ResourceScope.Assembly; 

        public static String MakeVersionSafeName(String name, ResourceScope from, ResourceScope to) 
        { 
            return MakeVersionSafeName(name, from, to, null);
        } 

        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
        public static String MakeVersionSafeName(String name, ResourceScope from, ResourceScope to, Type type) 
        {
            ResourceScope fromResType = from & ResTypeMask; 
            ResourceScope toResType = to & ResTypeMask; 
            if (fromResType > toResType)
                throw new ArgumentException(Environment.GetResourceString("Argument_ResourceScopeWrongDirection", fromResType, toResType), "from"); 

            SxSRequirements requires = GetRequirements(to, from);

            if ((requires & (SxSRequirements.AssemblyName | SxSRequirements.TypeName)) != 0 && type == null) 
                throw new ArgumentNullException("type", Environment.GetResourceString("ArgumentNull_TypeRequiredByResourceScope"));
 
            String postfix = ""; 
            const String separator = "_";
            if ((requires & SxSRequirements.ProcessID) != 0) 
                postfix += separator + Win32Native.GetCurrentProcessId();
            if ((requires & SxSRequirements.AppDomainID) != 0)
                postfix += separator + AppDomain.CurrentDomain.GetAppDomainId();
            if ((requires & SxSRequirements.TypeName) != 0) 
                postfix += separator + type.Name;
            if ((requires & SxSRequirements.AssemblyName) != 0) 
                postfix += separator + type.Assembly.FullName; 

            return name + postfix; 
        }

        private static SxSRequirements GetRequirements(ResourceScope consumeAsScope, ResourceScope calleeScope)
        { 
            SxSRequirements requires = SxSRequirements.None;
 
            switch(calleeScope & ResTypeMask) { 
            case ResourceScope.Machine:
                switch(consumeAsScope & ResTypeMask) { 
                case ResourceScope.Machine:
                    // No work
                    break;
 
                case ResourceScope.Process:
                    requires |= SxSRequirements.ProcessID; 
                    break; 

                case ResourceScope.AppDomain: 
                    requires |= SxSRequirements.AppDomainID | SxSRequirements.ProcessID;
                    break;

                default: 
                    throw new ArgumentException(Environment.GetResourceString("Argument_BadResourceScopeTypeBits", consumeAsScope), "consumeAsScope");
                } 
                break; 

            case ResourceScope.Process: 
                if ((consumeAsScope & ResourceScope.AppDomain) != 0)
                    requires |= SxSRequirements.AppDomainID;
                break;
 
            case ResourceScope.AppDomain:
                // No work 
                break; 

            default: 
                throw new ArgumentException(Environment.GetResourceString("Argument_BadResourceScopeTypeBits", calleeScope), "calleeScope");
            }

            switch(calleeScope & VisibilityMask) { 
            case ResourceScope.None:  // Public - implied
                switch(consumeAsScope & VisibilityMask) { 
                case ResourceScope.None:  // Public - implied 
                    // No work
                    break; 

                case ResourceScope.Assembly:
                    requires |= SxSRequirements.AssemblyName;
                    break; 

                case ResourceScope.Private: 
                    requires |= SxSRequirements.TypeName | SxSRequirements.AssemblyName; 
                    break;
 
                default:
                    throw new ArgumentException(Environment.GetResourceString("Argument_BadResourceScopeVisibilityBits", consumeAsScope), "consumeAsScope");
                }
                break; 

            case ResourceScope.Assembly: 
                if ((consumeAsScope & ResourceScope.Private) != 0) 
                    requires |= SxSRequirements.TypeName;
                break; 

            case ResourceScope.Private:
                // No work
                break; 

            default: 
                throw new ArgumentException(Environment.GetResourceString("Argument_BadResourceScopeVisibilityBits", calleeScope), "calleeScope"); 
            }
 
            if (consumeAsScope == calleeScope) {
                BCLDebug.Assert(requires == SxSRequirements.None, "Computed a strange set of required resource scoping.  It's probably wrong.");
            }
 
            return requires;
        } 
    } 
}
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