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Resolving Symbolic References in a CodeDOM (Part 7)

, 2 Dec 2012 CDDL 6.3K 344 13
Resolving symbolic references in a CodeDOM.
Nova.0.6.exe.zip
Mono.Cecil.dll
Nova.CLI.exe
Nova.CodeDOM.dll
Nova.Examples.exe
Nova.Studio.exe
Nova.Test.exe
Nova.UI.dll
Nova.0.6.zip
Nova.CLI
Properties
Nova.CodeDOM
CodeDOM
Annotations
Base
Comments
Base
DocComments
CodeRef
Base
List
Name
Base
Other
Simple
CompilerDirectives
Base
Conditionals
Base
Messages
Base
Pragmas
Base
Symbols
Base
Base
Interfaces
Expressions
AnonymousMethods
Base
Operators
Base
Binary
Arithmetic
Base
Assignment
Base
Bitwise
Base
Conditional
Relational
Base
Shift
Base
Other
Base
Unary
Base
Other
References
Base
GotoTargets
Base
Methods
Namespaces
Other
Properties
Types
Base
Variables
Base
Projects
Assemblies
Namespaces
References
Base
Statements
Base
Conditionals
Base
Exceptions
Generics
Constraints
Base
Iterators
Base
Jumps
Loops
Methods
OperatorDecls
Miscellaneous
Namespaces
Properties
Base
Events
Types
Base
Variables
Base
Parsing
Base
Properties
Rendering
Resolving
Utilities
Mono.Cecil
Reflection
Nova.Examples
Properties
Nova.Studio
Images
About.png
Configuration.png
EditCopy.png
EditCut.png
EditDelete.png
EditPaste.png
EditRedo.png
EditUndo.png
Error.png
Exit.png
FileNew.png
FileOpen.png
FileSave.png
FileSaveAll.png
FileSaveAs.png
Find.png
Help.png
Info.png
Logo.png
Options.png
Print.png
PrintPreview.png
Properties.png
Todo.png
Warning.png
Objects.ico
Properties
Settings.settings
Nova.Test
Properties
Nova.UI
CodeDOM
Annotations
Base
Comments
Base
DocComments
CodeRef
Base
List
Name
Base
Other
Simple
CompilerDirectives
Base
Conditionals
Base
Messages
Base
Pragmas
Base
Symbols
Base
Base
Expressions
AnonymousMethods
Base
Operators
Base
Binary
Arithmetic
Base
Assignment
Base
Bitwise
Base
Conditional
Relational
Base
Shift
Base
Other
Base
Unary
Base
Other
References
Base
GotoTargets
Base
Methods
Namespaces
Other
Properties
Types
Base
Variables
Base
Projects
Namespaces
References
Base
Statements
Base
Conditionals
Base
Exceptions
Generics
Constraints
Base
Iterators
Base
Jumps
Loops
Methods
OperatorDecls
Miscellaneous
Namespaces
Properties
Base
Events
Types
Base
Variables
Base
Properties
Resolving
Utilties
// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System;
using System.Configuration;
using System.Reflection;

using Nova.CodeDOM;

namespace Nova
{
    /// <summary>
    /// Configuration class for Nova classes.
    /// </summary>
    public class Configuration : ConfigurationSection
    {
        /// <summary>
        /// Determines if non-default configuration settings should be logged.
        /// </summary>
        public static bool LogSettings = true;

        /// <summary>
        /// A key-value collection for all Nova settings (works like 'appSettings', but in a separate configSection).
        /// </summary>
        [ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)]
        public KeyValueConfigurationCollection Settings
        {
            get { return (KeyValueConfigurationCollection)this[""]; }
            set { this[""] = value; }
        }

        /// <summary>
        /// Load the settings from the config file.
        /// </summary>
        public static void LoadSettings()
        {
            string namespaceName = typeof(Configuration).Namespace;
            try
            {
                // Use reflection to set any static fields on any types.  Use the calling assembly so that this method
                // can be called for different assemblies (such as Nova.CodeDOM.dll and Nova.UI.dll).
                Assembly assembly = Assembly.GetCallingAssembly();
                Configuration config = (Configuration)ConfigurationManager.GetSection(namespaceName);
                if (config == null)
                    Log.DetailWriteLine("Nova.Configuration: WARNING: No '" + namespaceName + "' section found in .config file.");
                else
                {
                    foreach (string key in config.Settings.AllKeys)
                    {
                        // Split the key into a type name (with optional namespace prefix) and field name
                        int typeNameIndex = key.LastIndexOf('.');
                        if (typeNameIndex < 0)
                            LogMessage("Invalid key format '" + key + "' - must be 'typename.fieldname' or 'namespace.typename.fieldname'!", MessageSeverity.Error);
                        else
                        {
                            string typeName = key.Substring(0, typeNameIndex);
                            string fieldName = key.Substring(typeNameIndex + 1);

                            // Get the type using reflection - just ignore any types that aren't found, so that
                            // settings can exist in the file for different assemblies.  Also, we'll allow types
                            // under the Mono namespace through without prefixing the Nova namespace onto them.
                            string fullTypeName = (typeName.StartsWith("Mono.") ? typeName : namespaceName + "." + typeName);
                            Type type = assembly.GetType(fullTypeName);
                            if (type != null)
                            {
                                // Get the field from the type (assume it's public and static)
                                FieldInfo fieldInfo = type.GetField(fieldName, BindingFlags.Public | BindingFlags.Static);
                                if (fieldInfo == null)
                                    LogMessage("Type '" + typeName + "' doesn't have a public static field '" + fieldName + "'!", MessageSeverity.Error);
                                else
                                {
                                    // Set the static field to the value from the config file
                                    Type fieldType = fieldInfo.FieldType;
                                    object value = config.Settings[key].Value;
                                    if (fieldType.IsEnum && value is string)
                                    {
                                        if (fieldType == typeof(Log.Level))
                                        {
                                            Log.Level enumValue;
                                            if (Enum.TryParse((string)value, true, out enumValue))
                                                value = enumValue;
                                        }
                                    }
                                    fieldInfo.SetValue(null, Convert.ChangeType(value, fieldType));
                                    if (LogSettings)
                                        LogMessage(typeName + "." + fieldName + " = " + value, MessageSeverity.Information);
                                }
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                LogException(ex, "loading");
            }
        }

        /// <summary>
        /// Log the specified text message with the specified severity level.
        /// </summary>
        public static void LogMessage(string message, MessageSeverity severity, string toolTip)
        {
            string prefix = (severity == MessageSeverity.Error ? "ERROR: " : (severity == MessageSeverity.Warning ? "Warning: " : ""));
            if (severity == MessageSeverity.Error || severity == MessageSeverity.Warning || Log.LogLevel >= Log.Level.Detailed)
                Log.WriteLine(prefix + "Configuration file: " + message, toolTip != null ? toolTip.TrimEnd() : null);
        }

        /// <summary>
        /// Log the specified text message with the specified severity level.
        /// </summary>
        public static void LogMessage(string message, MessageSeverity severity)
        {
            LogMessage(message, severity, null);
        }

        /// <summary>
        /// Log the specified exception and message.
        /// </summary>
        public static string LogException(Exception ex, string message)
        {
            return Log.Exception(ex, message + " configuration file");
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Common Development and Distribution License (CDDL)

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About the Author

KenBeckett
Software Developer (Senior)
United States United States
I've been writing software since the late 70's, currently focusing mainly on C#.NET. I also like to travel around the world, and I own a Chocolate Factory (sadly, none of my employees are oompa loompas).

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