namespace Zerotrilogy.ApplicationBlocks.Framework
{
	using System;
	using System.Reflection;
	using System.Collections;
	using System.Collections.Specialized;
	using System.Configuration;
	using System.Xml;

public class ClassConfig
	{
		private static IDictionary settings;
		private static string configRoot;
		private static Assembly assembly;

		/// 
		/// Default constructor, will retrieve configuration settings for the calling assembly
		/// 
		public ClassConfig() : this(Assembly.GetCallingAssembly()) { }

		/// 
		/// Overloaded constructor, will retrieve configuration settings for the specified assembly
		/// 
		/// The assembly to retrieve configuration settings for
		public ClassConfig(Assembly asm) : this(asm, "appSettings")	{ }

		/// 
		/// Overloaded constructor, will retrieve configuration settings for the specified assembly using the specified root element in the configuration file
		/// 
		/// The assembly to retrieve configuration settings for
		/// The root element of the configuration file
		public ClassConfig(Assembly asm, string configRootElement)
		{
			assembly = asm;
			settings = GetConfig(asm);
			configRoot = configRootElement;
		}

		/// 
		/// Gets and sets the root configuration element in the calling assembly's configuration file
		/// 
		public string ConfigurationRoot
		{
			get { return configRoot; }
			set { configRoot = value; }
		}

		/// 
		/// Indexer used to retrieve a specific key value
		/// 
		/// 
		/// Used by external classes to retrieve configuration settings
		/// 
		/// the  takes the name of the configuration setting/>
		public string this[string key]
		{
			get
			{
				string settingValue = null;
				settings = GetConfig(assembly);

				if( settings != null )
				{
					settingValue = settings[key] as string;
				}

				return(settingValue == null ? "" : settingValue);
			}
		}

		/// 
		/// Indexer used to retrieve a specific key value for the specified assembly
		/// 
		/// 
		/// Used by external classes to retrieve configuration settings for an external assembly
		/// 
		/// the  takes the name of the configuration setting/>
		/// the  takes the assembly to get the configuration setting for/>
		public string this[string key, Assembly assem]
		{
			get
			{
				string settingValue = null;
				settings = GetConfig(assem);

				if (settings != null)
				{
					settingValue = settings[key] as string;
				}

				return (settingValue == null ? "" : settingValue);
			}
		}

		/// 
		/// Gets the configuration settings for the calling assembly
		/// 
		/// An object of type IDictionary containing a Kay Value pair
		public static IDictionary GetConfig()
		{
			return GetConfig(assembly);
		}

		/// 
		/// Gets the configuration settings for the specified assembly
		/// 
		/// The assembly to get the configuration settings for
		/// An object of type IDictionary containing a Kay Value pair
		public static IDictionary GetConfig( Assembly asm )
		{
			string cfgFile = string.Empty;
			string nodeName = string.Empty;
			// Open and parse configuration file for specified
			// assembly, returning collection to caller for future
			// use outside of this class.
			try
			{
				cfgFile = asm.CodeBase + ".config";
				nodeName = configRoot;
			}
		}
			XmlDocument doc = new XmlDocument();
		doc.Load(new XmlTextReader(cfgFile));
   
		XmlNodeList nodes = doc.GetElementsByTagName(nodeName);
		foreach( XmlNode node in nodes )
		{
         	if( node.LocalName == nodeName )
		{
			DictionarySectionHandler handler = new DictionarySectionHandler();
			return (IDictionary)handler.Create(null, null, node);
		}
	}
	}
	catch { }

	return(null);
		}
	}
}