Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/Configuration/FolderLevelBuildProviderCollection.cs

@@ -0,0 +1,132 @@
+//------------------------------------------------------------------------------
+// <copyright file="FolderLevelBuildProviderCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Configuration {
+    using System;
+    using System.Collections.Generic;
+    using System.Configuration;
+    using System.Web.Compilation;
+
+    // class CompilationSection
+
+    [ConfigurationCollection(typeof(FolderLevelBuildProvider))]
+    public sealed class FolderLevelBuildProviderCollection : ConfigurationElementCollection {
+        private static ConfigurationPropertyCollection _properties;
+        private Dictionary<FolderLevelBuildProviderAppliesTo, List<Type>> _buildProviderMappings;
+        private HashSet<Type> _buildProviderTypes;
+
+        private bool _folderLevelBuildProviderTypesSet;
+
+        static FolderLevelBuildProviderCollection() {
+            // Property initialization
+            _properties = new ConfigurationPropertyCollection();
+        }
+        
+        public FolderLevelBuildProviderCollection()
+            : base(StringComparer.OrdinalIgnoreCase) {
+        }
+
+        protected override ConfigurationPropertyCollection Properties {
+            get {
+                return _properties;
+            }
+        }
+
+        public new BuildProvider this[string name] {
+            get {
+                return (BuildProvider)BaseGet(name);
+            }
+        }
+        public FolderLevelBuildProvider this[int index] {
+            get {
+                return (FolderLevelBuildProvider)BaseGet(index);
+            }
+            set {
+                if (BaseGet(index) != null)
+                    BaseRemoveAt(index);
+                BaseAdd(index, value);
+            }
+        }
+
+        public void Add(FolderLevelBuildProvider buildProvider) {
+            BaseAdd(buildProvider);
+        }
+        
+        public void Remove(String name) {
+            BaseRemove(name);
+        }
+        
+        public void RemoveAt(int index) {
+            BaseRemoveAt(index);
+        }
+        
+        public void Clear() {
+            BaseClear();
+        }
+        
+        protected override ConfigurationElement CreateNewElement() {
+            return new FolderLevelBuildProvider();
+        }
+
+        protected override Object GetElementKey(ConfigurationElement element) {
+            return ((FolderLevelBuildProvider)element).Name;
+        }
+
+        // Add a mapping from appliesTo to the buildProviderType
+        private void AddMapping(FolderLevelBuildProviderAppliesTo appliesTo, Type buildProviderType) {
+            if (_buildProviderMappings == null) {
+                _buildProviderMappings = new Dictionary<FolderLevelBuildProviderAppliesTo, List<Type>>();
+            }
+            if (_buildProviderTypes == null) {
+                _buildProviderTypes = new HashSet<Type>();
+            }
+            List<Type> buildProviders = null;
+            if (!_buildProviderMappings.TryGetValue(appliesTo, out buildProviders)) {
+                buildProviders = new List<Type>();
+                _buildProviderMappings.Add(appliesTo, buildProviders);
+            }
+            buildProviders.Add(buildProviderType);
+
+            _buildProviderTypes.Add(buildProviderType);
+        }
+
+        internal List<Type> GetBuildProviderTypes(FolderLevelBuildProviderAppliesTo appliesTo) {
+            EnsureFolderLevelBuildProvidersInitialized();
+            var buildProviders = new List<Type>();
+            if (_buildProviderMappings != null) {
+                foreach (var pair in _buildProviderMappings) {
+                    if ((pair.Key & appliesTo) != 0) {
+                        buildProviders.AddRange(pair.Value);
+                    }
+                }
+            }
+            return buildProviders;
+        }
+
+        internal bool IsFolderLevelBuildProvider(Type t) {
+            EnsureFolderLevelBuildProvidersInitialized();
+            if (_buildProviderTypes != null) {
+                return _buildProviderTypes.Contains(t);
+            }
+            return false;
+        }
+
+
+        // Initialize the dictionary mapping appliesTo to buildProvider types
+        private void EnsureFolderLevelBuildProvidersInitialized() {
+            if (!_folderLevelBuildProviderTypesSet) {
+                lock (this) {
+                    if (!_folderLevelBuildProviderTypesSet) {
+                        foreach (FolderLevelBuildProvider buildProvider in this) {
+                            AddMapping(buildProvider.AppliesToInternal, buildProvider.TypeInternal);
+                        }
+                        _folderLevelBuildProviderTypesSet = true;
+                    }
+                }
+            }
+        }
+    }
+}