using System;
using System.Collections;
using System.Collections.Specialized;
using System.Web;
namespace SPSolutions.Web
{
	public class QueryString : NameValueCollection
	{
		private string document;
		public string Document
		{
			get
			{
				return this.document;
			}
		}
		public QueryString()
		{
		}
		public QueryString(NameValueCollection clone) : base(clone)
		{
		}
		public static QueryString FromCurrent()
		{
			return QueryString.FromUrl(HttpContext.Current.Request.Url.AbsoluteUri);
		}
		public static QueryString FromUrl(string url)
		{
			string[] array = url.Split("?".ToCharArray());
			QueryString queryString = new QueryString();
			queryString.document = array[0];
			if (array.Length == 1)
			{
				return queryString;
			}
			string[] array2 = array[1].Split("&".ToCharArray());
			string[] array3 = array2;
			for (int i = 0; i < array3.Length; i++)
			{
				string text = array3[i];
				string[] array4 = text.Split("=".ToCharArray());
				if (array4.Length == 1)
				{
					queryString.Add(array4[0], "");
				}
				queryString.Add(array4[0], array4[1]);
			}
			return queryString;
		}
		public void ClearAllExcept(string except)
		{
			this.ClearAllExcept(new string[]
			{
				except
			});
		}
		public void ClearAllExcept(string[] except)
		{
			ArrayList arrayList = new ArrayList();
			string[] allKeys = this.AllKeys;
			for (int i = 0; i < allKeys.Length; i++)
			{
				string text = allKeys[i];
				for (int j = 0; j < except.Length; j++)
				{
					string text2 = except[j];
					if (text.ToLower() == text2.ToLower() && !arrayList.Contains(text))
					{
						arrayList.Add(text);
					}
				}
			}
			foreach (string name in arrayList)
			{
				this.Remove(name);
			}
		}
		public override void Add(string name, string value)
		{
			if (base[name] != null)
			{
				base[name] = value;
				return;
			}
			base.Add(name, value);
		}
		public override string ToString()
		{
			return this.ToString(false);
		}
		public string ToString(bool includeUrl)
		{
			string[] array = new string[this.Count];
			string[] allKeys = this.AllKeys;
			for (int i = 0; i < allKeys.Length; i++)
			{
				array[i] = allKeys[i] + "=" + HttpUtility.UrlEncode(base[allKeys[i]]);
			}
			string text = string.Join("&", array);
			if (!string.IsNullOrEmpty(text) && !text.StartsWith("?"))
			{
				text = "?" + text;
			}
			if (includeUrl)
			{
				text = this.document + text;
			}
			return text;
		}
	}
}