Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Common / DBProviderConfigurationHandler.cs / 1305376 / DBProviderConfigurationHandler.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- 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 //// // //// // this class is delayed created, use ConfigurationManager.GetSection("system.data.// //// ") 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(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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