Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/Common/DbProviderConfigurationHandler.cs

@@ -0,0 +1,189 @@
+//------------------------------------------------------------------------------
+// <copyright file="DbProviderConfigurationHandler.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Data.Common {
+
+    using System;
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Configuration;
+    using System.Data;
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Xml;
+
+    // this calss can be used by any provider to support a provider specific configuration section. The configutation
+    // Object is a NameValueCollection
+   
+    // <configSections>
+    //     <section name="system.data.<provider>" type="System.data.common.DbProviderConfigurationHandler, System.Data, Version=%ASSEMBLY_VERSION%, Culture=neutral, PublicKeyToken=%ECMA_PUBLICKEY%" />
+    // </configSections>
+    // <system.data.<provider>
+    //     <settings>
+    //         <add name="<provider setting" value = "<value of setting>"  />
+    //     </settings>
+    // </system.data.<provider>
+    // this class is delayed created, use ConfigurationManager.GetSection("system.data.<provider>") to obtain
+    
+    public class DbProviderConfigurationHandler : IConfigurationSectionHandler { // V1.2.3300
+        internal const string settings = "settings";
+      
+
+        public DbProviderConfigurationHandler() { // V1.2.3300
+        }
+/*
+        static internal void CheckForChildNodes(XmlNode node) {
+            if (node.HasChildNodes) {
+                throw ADP.ConfigBaseNoChildNodes(node.FirstChild);
+            }
+        }
+
+        static private void CheckForNonElement(XmlNode node) {
+            if (XmlNodeType.Element != node.NodeType) {
+                throw ADP.ConfigBaseElementsOnly(node);
+            }
+        }
+        
+        static internal void CheckForUnrecognizedAttributes(XmlNode node) {
+            if (0 != node.Attributes.Count) {
+                throw ADP.ConfigUnrecognizedAttributes(node);
+            }
+        }
+*/
+        static internal NameValueCollection CloneParent(NameValueCollection parentConfig) {
+            if (null == parentConfig) {
+                parentConfig = new NameValueCollection();
+            }
+            else {
+                parentConfig = new NameValueCollection(parentConfig);
+            }
+            return parentConfig;
+        }
+        
+        virtual public object Create(object parent, object configContext, XmlNode section) { // V1.2.3300
+#if DEBUG
+            try {
+#endif
+                return CreateStatic(parent, configContext, section);
+#if DEBUG
+            }
+            catch(Exception e) {
+                // 
+                if (ADP.IsCatchableExceptionType(e)) {
+                    ADP.TraceExceptionWithoutRethrow(e); // it will be rethrown
+                }
+                throw;
+            }
+#endif
+        }
+
+        static internal object CreateStatic(object parent, object configContext, XmlNode section) {            
+            object config = parent;
+            if (null != section) {
+                config = CloneParent(parent as NameValueCollection);
+                bool foundSettings = false;
+
+                HandlerBase.CheckForUnrecognizedAttributes(section);
+                foreach (XmlNode child in section.ChildNodes) {
+                    if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child)) {
+                        continue;
+                    }
+                    string sectionGroup = child.Name;
+                    switch(sectionGroup) {
+                    case DbProviderConfigurationHandler.settings:
+                        if (foundSettings) {
+                            throw ADP.ConfigSectionsUnique(DbProviderConfigurationHandler.settings);
+                        }
+                        foundSettings= true;
+                        DbProviderDictionarySectionHandler.CreateStatic(config as NameValueCollection, configContext, child);
+                        break;
+                    default:
+                        throw ADP.ConfigUnrecognizedElement(child);
+                    }
+                }
+            }
+            return config;
+        }
+/*
+        // skip whitespace and comments, throws if non-element
+        static internal bool IsIgnorableAlsoCheckForNonElement(XmlNode node) {
+            if ((XmlNodeType.Comment == node.NodeType) || (XmlNodeType.Whitespace == node.NodeType)) {
+                return true;
+            }
+            HandlerBase.CheckForNonElement(node);
+            return false;
+        }
+  */      
+        static internal string RemoveAttribute(XmlNode node, string name) {
+            XmlNode attribute = node.Attributes.RemoveNamedItem(name);
+            if (null == attribute) {
+                throw ADP.ConfigRequiredAttributeMissing(name, node);
+            }
+            string value = attribute.Value;
+            if (0 == value.Length) {
+                throw ADP.ConfigRequiredAttributeEmpty(name, node);
+            }
+            return value;
+        }
+        
+        // based off of DictionarySectionHandler
+        sealed private class DbProviderDictionarySectionHandler/* : IConfigurationSectionHandler*/ {
+            
+            static internal NameValueCollection CreateStatic(NameValueCollection config, Object context, XmlNode section) {
+                if (null != section) {
+                    HandlerBase.CheckForUnrecognizedAttributes(section);
+                    }
+                    
+                    foreach (XmlNode child in section.ChildNodes) {
+                        if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child)) {
+                            continue;
+                        }
+                        switch(child.Name) {
+                        case "add":
+                            HandleAdd(child, config);
+                            break;
+                        case "remove":
+                            HandleRemove(child, config);
+                            break;
+                        case "clear":
+                            HandleClear(child, config);
+                            break;
+                        default:
+                            throw ADP.ConfigUnrecognizedElement(child);
+                        }
+                    }
+                return config;
+                
+            }
+            static private void HandleAdd(XmlNode child, NameValueCollection config) {
+
+                // should add vaildate that setting is a known supported setting 
+                // (i.e. that the value of the name attribute is is good)
+                HandlerBase.CheckForChildNodes(child);
+                string name = RemoveAttribute(child, "name");
+                string value = RemoveAttribute(child, "value");
+                HandlerBase.CheckForUnrecognizedAttributes(child);
+                config.Add(name,value);
+                
+            }
+            static private void HandleRemove(XmlNode child, NameValueCollection config) {
+                HandlerBase.CheckForChildNodes(child);                
+                String name = RemoveAttribute(child, "name");                
+                HandlerBase.CheckForUnrecognizedAttributes(child);
+                config.Remove(name);
+            }
+            static private void HandleClear(XmlNode child, NameValueCollection config) {
+                HandlerBase.CheckForChildNodes(child);
+                HandlerBase.CheckForUnrecognizedAttributes(child);
+                config.Clear();
+            }
+        }
+        
+    }
+}
+