DbProviderConfigurationHandler.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / DbProviderConfigurationHandler.cs / 1 / 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
 
#if WINFSInternalOnly
    internal 
#else 
    public
#endif 
    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.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DbProviderConfigurationHandler.cs source code in C# .NET

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