PROMS/VEPROMS.CSLA.Library/Config/XMLProperties.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Runtime.Serialization;
+using System.Xml;
+
+namespace VEPROMS.CSLA.Library
+{
+	public delegate string XMLPropertiesEvent(object sender, XMLPropertiesArgs args);
+	[Serializable()]
+	public class XMLProperties
+	{
+		#region Events
+		public event XMLPropertiesEvent LookInAncestor;
+		private string OnLookInAncestor(object sender, XMLPropertiesArgs args)
+		{
+			if (LookInAncestor != null) return LookInAncestor(sender, args);
+			return string.Empty;
+		}
+		#endregion
+		#region Constructors
+		public XMLProperties()
+		{
+			_XmlContents = new XmlDocument();
+			_XmlContents.LoadXml("<config/>");
+		}
+		public XMLProperties(string xml)
+		{
+			_XmlContents = new XmlDocument();
+			_XmlContents.LoadXml(xml);
+		}
+		#endregion
+		#region BusinessMethods
+		[NonSerialized]
+		private bool _ParentLookup=false;
+		public bool ParentLookup
+		{
+			get { return _ParentLookup; }
+			set { _ParentLookup = value; }
+		}
+		[NonSerialized]
+		XmlDocument _XmlContents;
+		public XmlDocument XmlContents
+		{
+			get { return _XmlContents; }
+		}
+		private XmlNode GetGroup(string group)
+		{
+			XmlNodeList xl = _XmlContents.DocumentElement.SelectNodes(string.Format("//{0}", group));
+			switch (xl.Count)
+			{
+				case 0: // No nodes found
+					return null;
+				case 1: // Found the node
+					XmlNode xn = xl[0];
+					if (xn.GetType() == typeof(XmlElement)) return xn;
+					throw new XmlPropertiesException("Retrieved {0} while looking for XmlElement //{1}", xn.GetType().ToString(), group);
+				default: // Found more than 1 node
+					throw new XmlPropertiesException("Found more than one node //{0}", group);
+			}
+		}
+		private XmlAttribute GetItem(XmlNode xx, string item)
+		{
+			XmlNodeList xl = xx.SelectNodes(string.Format("@{0}", item));
+			switch (xl.Count)
+			{
+				case 0: // No nodes found
+					return null;
+				case 1: // Found the node
+					XmlNode xn = xl[0];
+					if (xn.GetType() == typeof(XmlAttribute)) return (XmlAttribute)xn;
+					throw new XmlPropertiesException("Retrieved {0} while looking for XmlAttribute @{1}", xn.GetType().ToString(), item);
+				default: // Found more than 1 node
+					throw new XmlPropertiesException("Found more than one node @{0}", item);
+			}
+		}
+		public string this[string group, string item]
+		{
+			get
+			{
+				if (_ParentLookup) 
+					return OnLookInAncestor(this, new XMLPropertiesArgs(group, item));
+				XmlNode xn = GetGroup(group);
+				if (xn == null) return OnLookInAncestor(this,new XMLPropertiesArgs(group,item));
+				XmlNode xa = GetItem(xn, item);
+				if (xa == null) return OnLookInAncestor(this, new XMLPropertiesArgs(group, item));
+				return xa.InnerText;
+			}
+			set
+			{
+				if (value == null) value = string.Empty;
+				XmlNode xn = GetGroup(group);
+				if (xn == null)
+				{
+					if (value != string.Empty)// Add Group and Item
+					{
+						xn = _XmlContents.DocumentElement.AppendChild(_XmlContents.CreateElement(group));
+						XmlAttribute xa = xn.Attributes.Append(_XmlContents.CreateAttribute(item));
+						xa.Value = value;
+					}
+				}
+				else
+				{
+					XmlAttribute xa = GetItem(xn, item);
+					if (xa == null)
+					{
+						if (value != string.Empty) // Add Item
+						{
+							xa = xn.Attributes.Append(_XmlContents.CreateAttribute(item));
+							xa.Value = value;
+						}
+					}
+					else
+					{
+						if (value != string.Empty) // Add Item
+						{
+							xa.Value = value;
+						}
+						else
+						{
+							xn.Attributes.Remove(xa);
+							if (xn.Attributes.Count == 0)
+								_XmlContents.DocumentElement.RemoveChild(xn);
+						}
+					}
+				}
+			}
+		}
+		public override string ToString()
+		{
+			if (XmlContents == null) return null;
+			return XmlContents.OuterXml;
+		}
+		#endregion
+		#region XmlPropertiesException
+		public class XmlPropertiesException : Exception
+		{
+			public XmlPropertiesException() : base() { ;}
+			public XmlPropertiesException(string message) : base(message) { ;}
+			public XmlPropertiesException(string messageFormat,params  object [] args) : base(string.Format(messageFormat,args)) { ;}
+			public XmlPropertiesException(SerializationInfo info, StreamingContext context) : base(info, context) { ;}
+			public XmlPropertiesException(string message,Exception innerException) : base(message, innerException) { ;}
+		}
+		#endregion
+	}
+	public partial class XMLPropertiesArgs
+	{
+		#region Business Methods
+		private string _Group;
+		public string Group
+		{
+			get { return _Group; }
+			set { _Group = value; }
+		}
+		private string _Item;
+		public string Item
+		{
+			get { return _Item; }
+			set { _Item = value; }
+		}
+		#endregion
+		#region Factory Methods
+		private XMLPropertiesArgs() { ;}
+		public XMLPropertiesArgs(string group, string item)
+		{
+			_Group=group;
+			_Item=item;
+		}
+		#endregion
+	}
+}