Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Compilation/AppSettingsExpressionBuilder.cs

@@ -0,0 +1,85 @@
+//------------------------------------------------------------------------------
+// <copyright file="AppSettingsExpressionBuilder.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Compilation {
+    using System;
+    using System.Security.Permissions;
+    using System.CodeDom;
+    using System.ComponentModel;
+    using System.Configuration;
+    using System.Diagnostics;
+    using System.Web.UI;
+
+
+    [ExpressionPrefix("AppSettings")]
+    [ExpressionEditor("System.Web.UI.Design.AppSettingsExpressionEditor, " + AssemblyRef.SystemDesign)]
+    public class AppSettingsExpressionBuilder : ExpressionBuilder {
+        public override bool SupportsEvaluate {
+            get {
+                return true;
+            }
+        }
+
+
+        public override CodeExpression GetCodeExpression(BoundPropertyEntry entry,
+            object parsedData, ExpressionBuilderContext context) {
+
+            if (entry.DeclaringType == null || entry.PropertyInfo == null) {
+                return new CodeMethodInvokeExpression(
+                    new CodeTypeReferenceExpression(this.GetType()),
+                    "GetAppSetting",
+                    new CodePrimitiveExpression(entry.Expression.Trim()));
+            }
+            else {
+                return new CodeMethodInvokeExpression(
+                    new CodeTypeReferenceExpression(this.GetType()),
+                    "GetAppSetting",
+                    new CodePrimitiveExpression(entry.Expression.Trim()),
+                    new CodeTypeOfExpression(entry.DeclaringType),
+                    new CodePrimitiveExpression(entry.PropertyInfo.Name));
+            }
+        }
+
+        public override object EvaluateExpression(object target, BoundPropertyEntry entry,
+            object parsedData, ExpressionBuilderContext context) {
+
+            return GetAppSetting(entry.Expression, target.GetType(), entry.PropertyInfo.Name);
+        }
+
+        public static object GetAppSetting(string key) {
+            string value = ConfigurationManager.AppSettings[key];
+
+            if (value == null) {
+                throw new InvalidOperationException(SR.GetString(SR.AppSetting_not_found, key));
+            }
+            return value;
+        }
+
+        public static object GetAppSetting(string key, Type targetType, string propertyName) {
+            string value = ConfigurationManager.AppSettings[key];
+
+            if (targetType != null) {
+                PropertyDescriptor propDesc = TypeDescriptor.GetProperties(targetType)[propertyName];
+                if (propDesc != null) {
+                    if (propDesc.PropertyType != typeof(string)) {
+                        TypeConverter converter = propDesc.Converter;
+                        if (converter.CanConvertFrom(typeof(string))) {
+                            return converter.ConvertFrom(value);
+                        }
+                        else {
+                            throw new InvalidOperationException(SR.GetString(SR.AppSetting_not_convertible, value, propDesc.PropertyType.Name, propDesc.Name));
+                        }
+                    }
+                }
+            }
+
+            if (value == null) {
+                throw new InvalidOperationException(SR.GetString(SR.AppSetting_not_found, key));
+            }
+            return value;
+        }
+    }
+}

external/referencesource/System.Web/Compilation/ApplicationBuildProvider.cs

@@ -0,0 +1,87 @@
+//------------------------------------------------------------------------------
+// <copyright file="ApplicationBuildProvider.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+
+
+namespace System.Web.Compilation {
+
+using System;
+using System.IO;
+using System.Collections;
+using System.CodeDom.Compiler;
+using System.Web.Hosting;
+using System.Web.Util;
+using System.Web.UI;
+
+internal class ApplicationBuildProvider: BaseTemplateBuildProvider {
+
+    internal static BuildResultCompiledGlobalAsaxType GetGlobalAsaxBuildResult(bool isPrecompiledApp) {
+
+        string cacheKey = BuildManager.GlobalAsaxAssemblyName;
+        
+        // Try the cache first, and if it's not there, compile it
+        BuildResultCompiledGlobalAsaxType result = BuildManager.GetBuildResultFromCache(cacheKey) as
+            BuildResultCompiledGlobalAsaxType;
+        if (result != null)
+            return result;
+
+        // If this is a precompiled app don't attempt to compile it
+        if (isPrecompiledApp)
+            return null;
+
+        VirtualPath virtualPath = BuildManager.GlobalAsaxVirtualPath;
+
+        // If global.asax doesn't exist, just ignore it
+        if (!virtualPath.FileExists())
+            return null;
+
+        // Compile global.asax
+        ApplicationBuildProvider buildProvider = new ApplicationBuildProvider();
+        buildProvider.SetVirtualPath(virtualPath);
+
+        DateTime utcStart = DateTime.UtcNow;
+
+        BuildProvidersCompiler bpc = new BuildProvidersCompiler(virtualPath /*configPath*/, 
+            BuildManager.GenerateRandomAssemblyName(BuildManager.GlobalAsaxAssemblyName));
+
+        // Set the BuildProvider using a single item collection
+        bpc.SetBuildProviders(new SingleObjectCollection(buildProvider));
+
+        CompilerResults results = bpc.PerformBuild();
+
+        result = (BuildResultCompiledGlobalAsaxType) buildProvider.GetBuildResult(results);
+
+        // Top level assembliy should not be cached to memory.
+        result.CacheToMemory = false;
+
+        // Cache it for next time
+        BuildManager.CacheBuildResult(cacheKey, result, utcStart);
+
+        // Return the compiled type
+        return result;
+    }
+
+    protected override TemplateParser CreateParser() {
+        return new ApplicationFileParser();
+    }
+
+    internal override BaseCodeDomTreeGenerator CreateCodeDomTreeGenerator(TemplateParser parser) {
+        return new ApplicationFileCodeDomTreeGenerator((ApplicationFileParser)parser);
+    }
+
+    internal override BuildResultCompiledType CreateBuildResult(Type t) {
+        BuildResultCompiledGlobalAsaxType result = new BuildResultCompiledGlobalAsaxType(t);
+
+        // If global.asax contains <object> tags, set a flag to avoid doing useless work
+        // later on in HttpApplicationFactory (VSWhidbey 453101)
+        if (Parser.ApplicationObjects != null || Parser.SessionObjects != null)
+            result.HasAppOrSessionObjects = true;
+
+        return result;
+    }
+}
+
+}

external/referencesource/System.Web/Compilation/ApplicationFileCodeDomTreeGenerator.cs

@@ -0,0 +1,23 @@
+//------------------------------------------------------------------------------
+// <copyright file="ApplicationFileCodeDomTreeGenerator.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Compilation {
+
+using System;
+using System.Web.UI;
+
+internal class ApplicationFileCodeDomTreeGenerator : BaseCodeDomTreeGenerator {
+
+    protected ApplicationFileParser _appParser;
+
+    internal ApplicationFileCodeDomTreeGenerator(ApplicationFileParser appParser) : base(appParser) {
+        _appParser = appParser;
+    }
+
+    protected override bool IsGlobalAsaxGenerator { get { return true; } }
+}
+
+}

external/referencesource/System.Web/Compilation/BaseResourcesBuildProvider.cs

@@ -0,0 +1,202 @@
+//------------------------------------------------------------------------------
+// <copyright file="BaseResourcesBuildProvider.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Compilation {
+
+using System;
+using System.Resources;
+using System.Resources.Tools;
+using System.Reflection;
+using System.Globalization;
+using System.Collections;
+using System.IO;
+using System.Xml;
+using System.Xml.Schema;
+using System.CodeDom;
+using System.CodeDom.Compiler;
+using System.Web.Configuration;
+using System.Web.Hosting;
+using System.Web.Compilation;
+using System.Web.UI;
+using System.Web.Util;
+using Util=System.Web.UI.Util;
+
+/// Base class for BuildProviders that generate resources
+[BuildProviderAppliesTo(BuildProviderAppliesTo.Resources)]
+internal abstract class BaseResourcesBuildProvider : BuildProvider {
+
+    internal const string DefaultResourcesNamespace = "Resources";
+
+    // The generated namespace and type name
+    private string _ns;
+    private string _typeName;
+    
+    private string _cultureName;
+    private bool _dontGenerateStronglyTypedClass;
+
+    internal void DontGenerateStronglyTypedClass() {
+        _dontGenerateStronglyTypedClass = true;
+    }
+
+    public override void GenerateCode(AssemblyBuilder assemblyBuilder) {
+
+        _cultureName = GetCultureName();
+
+        if (!_dontGenerateStronglyTypedClass) {
+            // Get the namespace and type name that we will use
+            _ns = Util.GetNamespaceAndTypeNameFromVirtualPath(VirtualPathObject,
+                (_cultureName == null) ? 1 : 2 /*chunksToIgnore*/, out _typeName);
+
+            // Always prepend the namespace with Resources.
+            if (_ns.Length == 0)
+                _ns = DefaultResourcesNamespace;
+            else
+                _ns = DefaultResourcesNamespace + "." + _ns;
+        }
+
+        // Get an input stream for our virtual path, and get a resource reader from it
+        using (Stream inputStream = OpenStream()) {
+            IResourceReader reader = GetResourceReader(inputStream);
+
+            try {
+                GenerateResourceFile(assemblyBuilder, reader);
+            }
+            catch (ArgumentException e) {
+                // If the inner exception is Xml, throw that instead, as it contains more
+                // useful info
+                if (e.InnerException != null &&
+                    (e.InnerException is XmlException || e.InnerException is XmlSchemaException)) {
+                    throw e.InnerException;
+                }
+
+                // Otherwise, so just rethrow
+                throw;
+            }
+
+            // Skip the code part for satellite assemblies, or if dontGenerate is set
+            if (_cultureName == null && !_dontGenerateStronglyTypedClass)
+                GenerateStronglyTypedClass(assemblyBuilder, reader);
+        }
+    }
+
+    protected abstract IResourceReader GetResourceReader(Stream inputStream);
+
+    private void GenerateResourceFile(AssemblyBuilder assemblyBuilder, IResourceReader reader) {
+
+        // Get the name of the generated .resource file
+        string resourceFileName;
+        if (_ns == null) {
+            // In the case where we don't generate code, just name the resource file
+            // after the virtual file
+            resourceFileName = UrlPath.GetFileNameWithoutExtension(VirtualPath) + ".resources";
+        }
+        else if (_cultureName == null) {
+            // Name the resource file after the generated class, since that's what the
+            // generated class expects
+            resourceFileName = _ns + "." + _typeName + ".resources";
+        }
+        else {
+            // If it's a non-default resource, include the culture in the name
+            resourceFileName = _ns + "." + _typeName + "." + _cultureName + ".resources";
+        }
+
+        // Make it lower case, since GetManifestResourceStream (which we use later on) is
+        // case sensitive
+        resourceFileName = resourceFileName.ToLower(CultureInfo.InvariantCulture);
+
+        Stream outputStream = null;
+
+        try {
+            try {
+                try {
+                }
+                finally {
+                    // Put the assignment in a finally block to avoid a ThreadAbortException from
+                    // causing the created stream to not get assigned and become leaked (Dev10 bug 844463)
+                    outputStream = assemblyBuilder.CreateEmbeddedResource(this, resourceFileName);
+                }
+            }
+            catch (ArgumentException) {
+                // This throws an ArgumentException if the resource file name was already added.
+                // Catch the situation, and give a better error message (VSWhidbey 87110)
+
+                throw new HttpException(SR.GetString(SR.Duplicate_Resource_File, VirtualPath));
+            }
+
+            // Create an output stream from the .resource file
+            using (outputStream) {
+                using (ResourceWriter writer = new ResourceWriter(outputStream)) {
+                    // Enable resource writer to be target-aware
+                    writer.TypeNameConverter = System.Web.UI.TargetFrameworkUtil.TypeNameConverter;
+
+                    // Copy the resources
+                    foreach (DictionaryEntry de in reader) {
+                        writer.AddResource((string)de.Key, de.Value);
+                    }
+                }
+            }
+        }
+        finally {
+            // Always close the stream to avoid a ThreadAbortException from causing the stream
+            // to be leaked (Dev10 bug 844463)
+            if (outputStream != null) {
+                outputStream.Close();
+            }
+        }
+    }
+
+    private void GenerateStronglyTypedClass(AssemblyBuilder assemblyBuilder, IResourceReader reader) {
+
+        // Copy the resources into an IDictionary
+        IDictionary resourceList;
+        using (reader) {
+            resourceList = GetResourceList(reader);
+        }
+
+        // Generate a strongly typed class from the resources
+        CodeDomProvider provider = assemblyBuilder.CodeDomProvider;
+        string[] unmatchable;
+        CodeCompileUnit ccu = StronglyTypedResourceBuilder.Create(
+            resourceList, _typeName, _ns,
+            provider, false /*internalClass*/, out unmatchable);
+
+        // Ignore the unmatchable items.  We just won't generate code for them,
+        // but they'll still be usable via the ResourceManager (VSWhidbey 248226)
+
+// We decided to cut support for My.Resources (VSWhidbey 358088)
+#if OLD
+        // generate a My.Resources.* override (VSWhidbey 251554)
+        CodeNamespace ns = new CodeNamespace();
+        ns.Name = "My." + _ns;
+
+        CodeTypeDeclaration type = new CodeTypeDeclaration();
+        type.Name = _typeName;
+        CodeTypeReference baseType = new CodeTypeReference(_ns + "." + _typeName);
+
+        // Need to use a global reference to avoid a conflict, since the classes have the same name
+        baseType.Options = CodeTypeReferenceOptions.GlobalReference;
+        type.BaseTypes.Add(baseType);
+
+        ns.Types.Add(type);
+        ccu.Namespaces.Add(ns);
+#endif
+
+        // Add the code compile unit to the compilation
+        assemblyBuilder.AddCodeCompileUnit(this, ccu);
+    }
+
+    private IDictionary GetResourceList(IResourceReader reader) {
+
+        // Read the resources into a dictionary.
+        IDictionary resourceList = new Hashtable(StringComparer.OrdinalIgnoreCase);
+        foreach(DictionaryEntry de in reader)
+            resourceList.Add(de.Key, de.Value);
+
+        return resourceList;
+    }
+}
+
+}

external/referencesource/System.Web/Compilation/BaseTemplateBuildProvider.cs

@@ -0,0 +1,215 @@
+//------------------------------------------------------------------------------
+// <copyright file="BaseTemplateBuildProvider.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+
+
+namespace System.Web.Compilation {
+
+using System;
+using System.IO;
+using System.Collections;
+using System.Collections.Specialized;
+using System.Reflection;
+using System.CodeDom;
+using System.CodeDom.Compiler;
+using System.Web.Util;
+using System.Web.UI;
+
+internal abstract class BaseTemplateBuildProvider: InternalBuildProvider {
+
+    private TemplateParser _parser;
+    internal TemplateParser Parser { get { return _parser; } }
+
+    internal override IAssemblyDependencyParser AssemblyDependencyParser {
+        get { return _parser; }
+    }
+
+    private string _instantiatableFullTypeName;
+    private string _intermediateFullTypeName;
+
+    protected abstract TemplateParser CreateParser();
+
+    internal abstract BaseCodeDomTreeGenerator CreateCodeDomTreeGenerator(TemplateParser parser);
+
+    protected internal override CodeCompileUnit GetCodeCompileUnit(out IDictionary linePragmasTable) {
+        Debug.Assert(_parser != null);
+
+        // Return the provider type and compiler params
+        Type codeDomProviderType = _parser.CompilerType.CodeDomProviderType;
+
+        // Create a code generator for the language
+        CodeDomProvider codeDomProvider = CompilationUtil.CreateCodeDomProviderNonPublic(
+            codeDomProviderType);
+
+        // Create a designer mode codedom tree for the page
+        BaseCodeDomTreeGenerator treeGenerator = CreateCodeDomTreeGenerator(_parser);
+        treeGenerator.SetDesignerMode();
+        CodeCompileUnit ccu = treeGenerator.GetCodeDomTree(codeDomProvider,
+            new StringResourceBuilder(), VirtualPathObject);
+        linePragmasTable = treeGenerator.LinePragmasTable;
+
+// This code is used to see the full generated code in the debugger.  Just uncomment and look at
+// generatedCode in the debugger.  Don't check in with this code uncommented!
+#if TESTCODE
+        Stream stream = new MemoryStream();
+        StreamWriter writer = new StreamWriter(stream, System.Text.Encoding.Unicode);
+        codeDomProvider.GenerateCodeFromCompileUnit(ccu, writer, null /*CodeGeneratorOptions*/);
+        writer.Flush();
+        stream.Seek(0, SeekOrigin.Begin);
+        TextReader reader = new StreamReader(stream);
+        string generatedCode = reader.ReadToEnd();
+#endif
+
+        return ccu;
+    }
+
+    public override CompilerType CodeCompilerType {
+        get {
+            Debug.Assert(_parser == null);
+
+            _parser = CreateParser();
+
+            if (IgnoreParseErrors)
+                _parser.IgnoreParseErrors = true;
+
+            if (IgnoreControlProperties)
+                _parser.IgnoreControlProperties = true;
+
+            if (!ThrowOnFirstParseError)
+                _parser.ThrowOnFirstParseError = false;
+
+            _parser.Parse(ReferencedAssemblies, VirtualPathObject);
+
+            // If the page is non-compiled, don't ask for a language
+            if (!Parser.RequiresCompilation)
+                return null;
+
+            return _parser.CompilerType;
+        }
+    }
+
+    internal override ICollection GetCompileWithDependencies() {
+
+        // If there is a code besides file, return it
+
+        if (_parser.CodeFileVirtualPath == null)
+            return null;
+
+        // no-compile pages should not have any compile with dependencies
+        Debug.Assert(Parser.RequiresCompilation);
+
+        return new SingleObjectCollection(_parser.CodeFileVirtualPath);
+    }
+
+    public override void GenerateCode(AssemblyBuilder assemblyBuilder) {
+
+        // Don't generate any code for no-compile pages
+        if (!Parser.RequiresCompilation)
+            return;
+
+        BaseCodeDomTreeGenerator treeGenerator = CreateCodeDomTreeGenerator(_parser);
+
+        CodeCompileUnit ccu = treeGenerator.GetCodeDomTree(assemblyBuilder.CodeDomProvider,
+            assemblyBuilder.StringResourceBuilder, VirtualPathObject);
+
+        if (ccu != null) {
+            // Add all the assemblies
+            if (_parser.AssemblyDependencies != null) {
+                foreach (Assembly assembly in _parser.AssemblyDependencies) {
+                    assemblyBuilder.AddAssemblyReference(assembly, ccu);
+                }
+            }
+
+            assemblyBuilder.AddCodeCompileUnit(this, ccu);
+        }
+
+        // Get the name of the generated type that can be instantiated.  It may be null
+        // in updatable compilation scenarios.
+        _instantiatableFullTypeName = treeGenerator.GetInstantiatableFullTypeName();
+
+        // tell the assembly builder to generate a fast factory for this type
+        if (_instantiatableFullTypeName != null)
+            assemblyBuilder.GenerateTypeFactory(_instantiatableFullTypeName);
+
+        _intermediateFullTypeName = treeGenerator.GetIntermediateFullTypeName();
+    }
+
+    public override Type GetGeneratedType(CompilerResults results) {
+        return GetGeneratedType(results, useDelayLoadTypeIfEnabled: false);
+    }
+
+    internal Type GetGeneratedType(CompilerResults results, bool useDelayLoadTypeIfEnabled) {
+
+        // No Type is generated for no-compile pages
+        if (!Parser.RequiresCompilation)
+            return null;
+
+        // Figure out the Type that needs to be persisted
+        string typeName;
+
+        if (_instantiatableFullTypeName == null) {
+
+            if (Parser.CodeFileVirtualPath != null) {
+                // Updatable precomp of a code separation page: use the intermediate type
+                typeName = _intermediateFullTypeName;
+            }
+            else {
+                // Updatable precomp of a single page: use the base type, since nothing got compiled
+                return Parser.BaseType;
+            }
+        }
+        else {
+            typeName = _instantiatableFullTypeName;
+        }
+
+        Debug.Assert(typeName != null);
+
+        Type generatedType;
+        if (useDelayLoadTypeIfEnabled && DelayLoadType.Enabled) {
+            string assemblyFilename = Path.GetFileName(results.PathToAssembly);
+            string assemblyName = Util.GetAssemblyNameFromFileName(assemblyFilename);
+            generatedType = new DelayLoadType(assemblyName, typeName);
+        }
+        else {
+            generatedType = results.CompiledAssembly.GetType(typeName);
+        }
+
+        // It should always extend the required base type
+        // Note: removing this assert as advanced ControlBuilder scenarios allow changing the base type
+        //Debug.Assert(Parser.BaseType.IsAssignableFrom(generatedType));
+
+        return generatedType;
+    }
+
+    internal override BuildResultCompiledType CreateBuildResult(Type t) {
+        return new BuildResultCompiledTemplateType(t);
+    }
+
+    public override ICollection VirtualPathDependencies {
+        get {
+            return _parser.SourceDependencies;
+        }
+    }
+
+    internal override ICollection GetGeneratedTypeNames() {
+        if (_parser.GeneratedClassName == null && _parser.BaseTypeName == null) {
+            return null;
+        }
+
+        ArrayList collection = new ArrayList();
+        if (_parser.GeneratedClassName != null) {
+            collection.Add(_parser.GeneratedClassName);
+        }
+
+        if (_parser.BaseTypeName != null) {
+            collection.Add(Util.MakeFullTypeName(_parser.BaseTypeNamespace, _parser.BaseTypeName));
+        }
+
+        return collection;
+    }
+}
+
+}

external/referencesource/System.Web/Compilation/BuildDependencySet.cs

@@ -0,0 +1,35 @@
+//------------------------------------------------------------------------------
+// <copyright file="BuildDependencySet.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+/************************************************************************************************************/
+
+
+
+namespace System.Web.Compilation {
+
+    using System.Collections;
+    using System.Security.Permissions;
+
+
+    /// <devdoc>
+    ///    <para>
+    ///       Dependency set returned by BuildManager.GetCachedBuildDependencySet
+    ///    </para>
+    /// </devdoc>
+    public sealed class BuildDependencySet {
+
+        private BuildResult _result;
+
+        internal BuildDependencySet(BuildResult result) {
+            _result = result;
+        }
+
+
+        public string HashCode { get { return _result.VirtualPathDependenciesHash; } }
+
+        public IEnumerable VirtualPaths { get { return _result.VirtualPathDependencies; } }
+    }
+}

external/referencesource/System.Web/Compilation/BuildManager.cs.REMOVED.git-id

@@ -0,0 +1 @@
+9f26b6ed449d60e2c96baeff70f3bf474eaf9ecf

external/referencesource/System.Web/Compilation/BuildProviderAppliesTo.cs

@@ -0,0 +1,16 @@
+//------------------------------------------------------------------------------
+// <copyright file="BuildProviderAppliesTo.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Compilation {
+
+    [Flags]
+    public enum BuildProviderAppliesTo {
+        Web             = 0x1,
+        Code            = 0x2,
+        Resources       = 0x4,
+        All             = 0x7,
+    }
+}

external/referencesource/System.Web/Compilation/BuildProviderAppliesToAttribute.cs

@@ -0,0 +1,27 @@
+//------------------------------------------------------------------------------
+// <copyright file="BuildProviderAppliesToAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Compilation {
+
+    using System.Security.Permissions;
+    using System.Web.Configuration;
+
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+    public sealed class BuildProviderAppliesToAttribute : Attribute {
+
+        private BuildProviderAppliesTo _appliesTo;
+
+        public BuildProviderAppliesToAttribute(BuildProviderAppliesTo appliesTo) {
+            _appliesTo = appliesTo;
+        }
+
+        public BuildProviderAppliesTo AppliesTo {
+            get {
+                return _appliesTo;
+            }
+        }
+    }
+}