Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,143 @@
+//------------------------------------------------------------------------------
+// <copyright file="TransformerInfoCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Configuration {
+
+    using System;
+    using System.Configuration;
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Security.Principal;
+    using System.Web;
+    using System.Web.Compilation;
+    using System.Web.Configuration;
+    using System.Web.UI;
+    using System.Web.UI.WebControls;
+    using System.Web.UI.WebControls.WebParts;
+    using System.Web.Util;
+    using System.Xml;
+    using System.Security.Permissions;
+
+    [ConfigurationCollection(typeof(TransformerInfo))]
+    public sealed class TransformerInfoCollection : ConfigurationElementCollection {
+
+        private static ConfigurationPropertyCollection _properties;
+
+        private Hashtable _transformerEntries;
+
+        static TransformerInfoCollection() {
+            _properties = new ConfigurationPropertyCollection();
+        }
+
+        /// <internalonly />
+        protected override ConfigurationPropertyCollection Properties {
+            get {
+                return _properties;
+            }
+        }
+
+        public TransformerInfo this[int index] {
+            get {
+                return (TransformerInfo)BaseGet(index);
+            }
+            set {
+                if (BaseGet(index) != null) {
+                    BaseRemoveAt(index);
+                }
+                BaseAdd(index, value);
+            }
+        }
+
+        public void Add(TransformerInfo transformerInfo) {
+            BaseAdd(transformerInfo);
+        }
+
+        public void Clear() {
+            BaseClear();
+        }
+
+        /// <internalonly />
+        protected override ConfigurationElement CreateNewElement() {
+            return new TransformerInfo();
+        }
+
+        public void Remove(string s) {
+            BaseRemove(s);
+        }
+
+        public void RemoveAt(int index) {
+            BaseRemoveAt(index);
+        }
+
+        /// <internalonly />
+        protected override object GetElementKey(ConfigurationElement element) {
+            return ((TransformerInfo)element).Name;
+        }
+
+        internal Hashtable GetTransformerEntries() {
+            if (_transformerEntries == null) {
+                lock (this) {
+                    if (_transformerEntries == null) {
+                        _transformerEntries = new Hashtable(StringComparer.OrdinalIgnoreCase);
+
+                        foreach (TransformerInfo ti in this) {
+                            Type transformerType = ConfigUtil.GetType(ti.Type, "type", ti);
+
+                            if (transformerType.IsSubclassOf(typeof(WebPartTransformer)) == false) {
+                                throw new ConfigurationErrorsException(
+                                    SR.GetString(SR.Type_doesnt_inherit_from_type, 
+                                        ti.Type, 
+                                        typeof(WebPartTransformer).FullName),
+                                    ti.ElementInformation.Properties["type"].Source, 
+                                    ti.ElementInformation.Properties["type"].LineNumber);
+                            }
+
+                            Type consumerType;
+                            Type providerType;
+                            try {
+                                consumerType = WebPartTransformerAttribute.GetConsumerType(transformerType);
+                                providerType = WebPartTransformerAttribute.GetProviderType(transformerType);
+                            }
+                            catch (Exception e) {
+                                throw new ConfigurationErrorsException(
+                                    SR.GetString(SR.Transformer_attribute_error, e.Message),
+                                    e, 
+                                    ti.ElementInformation.Properties["type"].Source, 
+                                    ti.ElementInformation.Properties["type"].LineNumber);
+                            }
+
+                            if (_transformerEntries.Count != 0) {
+                                foreach (DictionaryEntry entry in _transformerEntries) {
+                                    Type existingTransformerType = (Type)entry.Value;
+
+                                    // We know these methods will not throw, because for the type to be in the transformers
+                                    // collection, we must have successfully gotten the types previously without an exception.
+                                    Type existingConsumerType = 
+                                        WebPartTransformerAttribute.GetConsumerType(existingTransformerType);
+                                    Type existingProviderType = 
+                                        WebPartTransformerAttribute.GetProviderType(existingTransformerType);
+
+                                    if ((consumerType == existingConsumerType) && (providerType == existingProviderType)) {
+                                        throw new ConfigurationErrorsException(
+                                            SR.GetString(SR.Transformer_types_already_added, 
+                                                (string)entry.Key, 
+                                                ti.Name),
+                                            ti.ElementInformation.Properties["type"].Source, 
+                                            ti.ElementInformation.Properties["type"].LineNumber);
+                                    }
+                                }
+                            }
+
+                            _transformerEntries[ti.Name] = transformerType;
+                        }
+                    }
+                }
+            }
+            // 
+            return _transformerEntries;
+        }
+    }
+}