DiagnosticsConfigurationHandler.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Services / Monitoring / system / Diagnosticts / DiagnosticsConfigurationHandler.cs / 1 / DiagnosticsConfigurationHandler.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

#if !LIB 
#define TRACE 
#define DEBUG
namespace System.Diagnostics { 

    using System;
    using System.Collections;
    using System.Diagnostics; 
    using System.Xml;
    using System.Configuration; 
    using System.Reflection; 
    using System.Globalization;
 
    /// 
    ///    The configuration section handler for the diagnostics section of the configuration
    ///    file. The section handler participates in the resolution of configuration settings
    ///    between the <diagnostics> and </diagnostics>portion of the .config file. 
    /// 
    ///  
    [Obsolete("This class has been deprecated.  http://go.microsoft.com/fwlink/?linkid=14202")] 
    public class DiagnosticsConfigurationHandler : IConfigurationSectionHandler {
 
        /// 
        ///    Parses the configuration settings between the
        ///       <diagnostics> and </diagnostics> portion of the .config file to populate
        ///       the values of 'WebServicesConfiguration' object and returning it. 
        ///    
        ///  
        ///  
        public virtual object Create(object parent, object configContext, XmlNode section) {
            bool foundSwitches = false; 
            bool foundAssert = false;
            bool foundTrace = false;
            bool foundCounters = false;
 
            HandlerBase.CheckForUnrecognizedAttributes(section);
 
            // Since the tracing and switch code lives in System.Dll and config is in System.Configuration.dll 
            // the settings just go into a hashtable to communicate to the values to the diagnostics code in System.dll
            Hashtable parentConfig = (Hashtable)parent; 
            Hashtable config;
            if (parentConfig == null)
                config = new Hashtable();
            else 
                config = (Hashtable)parentConfig.Clone();
 
            foreach (XmlNode child in section.ChildNodes) { 
                if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child))
                    continue; 

                switch (child.Name) {
                    case "switches":
                        if (foundSwitches) 
                            throw new ConfigurationErrorsException(SR.GetString(SR.ConfigSectionsUnique, "switches"));
                        foundSwitches = true; 
 
                        HandleSwitches(config, child, configContext);
                        break; 
                    case "assert":
                        if (foundAssert)
                            throw new ConfigurationErrorsException(SR.GetString(SR.ConfigSectionsUnique, "assert"));
                        foundAssert = true; 

                        HandleAssert(config, child, configContext); 
                        break; 
                    case "trace":
                        if (foundTrace) 
                            throw new ConfigurationErrorsException(SR.GetString(SR.ConfigSectionsUnique, "trace"));
                        foundTrace = true;

                        HandleTrace(config, child, configContext); 
                        break;
                    case "performanceCounters": 
                        if (foundCounters) 
                            throw new ConfigurationErrorsException(SR.GetString(SR.ConfigSectionsUnique, "performanceCounters"));
                        foundCounters = true; 

                        HandleCounters((Hashtable)parent, config, child, configContext);
                        break;
                    default: 
                        HandlerBase.ThrowUnrecognizedElement(child);
                        break; 
                } // switch(child.Name) 

                HandlerBase.CheckForUnrecognizedAttributes(child); 
            }
            return config;
        }
 
        private static void HandleSwitches(Hashtable config, XmlNode switchesNode, object context) {
            Hashtable switches = (Hashtable) new SwitchesDictionarySectionHandler().Create(config["switches"], context, switchesNode); 
            IDictionaryEnumerator en = switches.GetEnumerator(); 
            while (en.MoveNext()) {
                try { 
                    Int32.Parse((string) en.Value, CultureInfo.InvariantCulture);
                }
                catch {
                    throw new ConfigurationErrorsException(SR.GetString(SR.Value_must_be_numeric, en.Key)); 
                }
            } 
 
            config["switches"] = switches;
        } 

        private static void HandleAssert(Hashtable config, XmlNode assertNode, object context) {
            bool assertuienabled = false;
            if (HandlerBase.GetAndRemoveBooleanAttribute(assertNode, "assertuienabled", ref assertuienabled) != null) 
                config["assertuienabled"] = assertuienabled;
 
            string logfilename = null; 
            if (HandlerBase.GetAndRemoveStringAttribute(assertNode, "logfilename", ref logfilename) != null)
                config["logfilename"] = logfilename; 

            HandlerBase.CheckForChildNodes(assertNode);
        }
 
        private static void HandleCounters(Hashtable parent, Hashtable config, XmlNode countersNode, object context) {
            int filemappingsize = 0; 
            if (HandlerBase.GetAndRemoveIntegerAttribute(countersNode, "filemappingsize", ref filemappingsize) != null) { 
                //Should only be handled at machine config level
                if (parent == null) 
                    config["filemappingsize"] = filemappingsize;
            }

            HandlerBase.CheckForChildNodes(countersNode); 
        }
 
        private static void HandleTrace(Hashtable config, XmlNode traceNode, object context) { 
            bool foundListeners = false;
            bool autoflush = false; 
            if (HandlerBase.GetAndRemoveBooleanAttribute(traceNode, "autoflush", ref autoflush) != null)
                config["autoflush"] = autoflush;

            int indentsize = 0; 
            if (HandlerBase.GetAndRemoveIntegerAttribute(traceNode, "indentsize", ref indentsize) != null)
                config["indentsize"] = indentsize; 
 
            foreach (XmlNode traceChild in traceNode.ChildNodes) {
                if (HandlerBase.IsIgnorableAlsoCheckForNonElement(traceChild)) 
                    continue;

                if (traceChild.Name == "listeners") {
                    if (foundListeners) 
                        throw new ConfigurationErrorsException(SR.GetString(SR.ConfigSectionsUnique, "listeners"));
                    foundListeners = true; 
 
                    HandleListeners(config, traceChild, context);
                } 
                else {
                    HandlerBase.ThrowUnrecognizedElement(traceChild);
                }
            } 
        }
 
        private static void HandleListeners(Hashtable config, XmlNode listenersNode, object context) { 
            HandlerBase.CheckForUnrecognizedAttributes(listenersNode);
            foreach (XmlNode listenersChild in listenersNode.ChildNodes) { 
                if (HandlerBase.IsIgnorableAlsoCheckForNonElement(listenersChild))
                    continue;

                string name = null, className = null, initializeData = null; 
                string op = listenersChild.Name;
 
                switch (op) { 
                    case "add":
                    case "remove": 
                    case "clear":
                        break;
                    default:
                        HandlerBase.ThrowUnrecognizedElement(listenersChild); 
                        break;
                } 
 
                HandlerBase.GetAndRemoveStringAttribute(listenersChild, "name", ref name);
                HandlerBase.GetAndRemoveStringAttribute(listenersChild, "type", ref className); 
                HandlerBase.GetAndRemoveStringAttribute(listenersChild, "initializeData", ref initializeData);
                HandlerBase.CheckForUnrecognizedAttributes(listenersChild);
                HandlerBase.CheckForChildNodes(listenersChild);
 
                TraceListener newListener = null;
                if (className != null) { 
                    Type t = Type.GetType(className); 

                    if (t == null) 
                        throw new ConfigurationErrorsException(SR.GetString(SR.Could_not_find_type, className));

                    if (!typeof(TraceListener).IsAssignableFrom(t))
                        throw new ConfigurationErrorsException(SR.GetString(SR.Type_isnt_tracelistener, className)); 

                    // create a listener with parameterless constructor 
                    if (initializeData == null) { 
                        ConstructorInfo ctorInfo = t.GetConstructor(new Type[] {});
                        if (ctorInfo == null) 
                            throw new ConfigurationErrorsException(SR.GetString(SR.Could_not_get_constructor, className));
                        newListener = (TraceListener)(ctorInfo.Invoke(new object[] {}));
                    }
                    // create a listener with a one-string constructor 
                    else {
                        ConstructorInfo ctorInfo = t.GetConstructor(new Type[] { typeof(string) }); 
                        if (ctorInfo == null) 
                            throw new ConfigurationErrorsException(SR.GetString(SR.Could_not_get_constructor, className));
                        newListener = (TraceListener)(ctorInfo.Invoke(new object[] { initializeData })); 
                    }
                    if (name != null) {
                        newListener.Name = name;
                    } 
                }
 
                // we already verified above that we only have "add", "remove", or "clear", so we can 
                // switch on the first char here for perf.
                switch (op[0]) { 
                    case 'a':
                        if (newListener == null)
                            throw new ConfigurationErrorsException(SR.GetString(SR.Could_not_create_listener, name));
 
                        Trace.Listeners.Add(newListener);
 
                        break; 
                    case 'r':
                        if (newListener == null) { 
                            // no type specified, we'll have to delete by name

                            // if no name is specified we can't do anything
                            if (name == null) 
                                throw new ConfigurationErrorsException(SR.GetString(SR.Cannot_remove_with_null));
 
                            Trace.Listeners.Remove(name); 
                        }
                        else { 
                            // remove by listener
                            Trace.Listeners.Remove(newListener);
                        }
                        break; 
                    case 'c':
                        Trace.Listeners.Clear(); 
                        break; 
                    default:
                        HandlerBase.ThrowUnrecognizedElement(listenersChild); 
                        break;
                }
            }
        } 
    }
 
    internal class SwitchesDictionarySectionHandler : DictionarySectionHandler { 
        protected override string KeyAttributeName {
            get { return "name";} 
        }

        internal override bool ValueRequired {
            get { return true; } 
        }
 
    } 
}
 
#endif

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