Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/sys/system/configuration/NameValueSectionHandler.cs

@@ -0,0 +1,95 @@
+//------------------------------------------------------------------------------
+// <copyright file="NameValueSectionHandler.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration {
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Xml;
+    using System.Globalization;
+
+    /// <devdoc>
+    ///    Simple dictionary config factory
+    /// </devdoc>
+    public class NameValueSectionHandler : IConfigurationSectionHandler {
+        const string defaultKeyAttribute = "key";
+        const string defaultValueAttribute = "value";
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public object Create(object parent, object context, XmlNode section) {
+            return CreateStatic(parent, section, KeyAttributeName, ValueAttributeName);
+        }
+
+        internal static object CreateStatic(object parent, XmlNode section) {
+            return CreateStatic(parent, section, defaultKeyAttribute, defaultValueAttribute);
+        }
+
+        internal static object CreateStatic(object parent, XmlNode section, string keyAttriuteName, string valueAttributeName) {
+            ReadOnlyNameValueCollection result;
+
+            // start result off as a shallow clone of the parent
+
+            if (parent == null)
+                result = new ReadOnlyNameValueCollection(StringComparer.OrdinalIgnoreCase);
+            else {
+                ReadOnlyNameValueCollection parentCollection = (ReadOnlyNameValueCollection)parent;
+                result = new ReadOnlyNameValueCollection(parentCollection);
+            }
+
+            // process XML
+
+            HandlerBase.CheckForUnrecognizedAttributes(section);
+
+            foreach (XmlNode child in section.ChildNodes) {
+
+                // skip whitespace and comments
+                if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child))
+                    continue;
+
+                // handle <set>, <remove>, <clear> tags
+                if (child.Name == "add") {
+                    String key = HandlerBase.RemoveRequiredAttribute(child, keyAttriuteName);
+                    String value = HandlerBase.RemoveRequiredAttribute(child, valueAttributeName, true/*allowEmptyString*/);
+                    HandlerBase.CheckForUnrecognizedAttributes(child);
+
+                    result[key] = value;
+                }
+                else if (child.Name == "remove") {
+                    String key = HandlerBase.RemoveRequiredAttribute(child, keyAttriuteName);
+                    HandlerBase.CheckForUnrecognizedAttributes(child);
+
+                    result.Remove(key);
+                }
+                else if (child.Name.Equals("clear")) {
+                    HandlerBase.CheckForUnrecognizedAttributes(child);
+                    result.Clear();
+                }
+                else {
+                    HandlerBase.ThrowUnrecognizedElement(child);
+                }
+            }
+
+            result.SetReadOnly();
+
+            return result;
+        }
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        protected virtual string KeyAttributeName {
+            get { return defaultKeyAttribute;}
+        }
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        protected virtual string ValueAttributeName {
+            get { return defaultValueAttribute;}
+        }
+    }
+}