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/**
* Namespace: System.Web.Utils
* Class: WebEqualComparer
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Implementation: yes
* Status: ??%
*
* (C) Gaurav Vaish (2001)
*/
using System;
using System.Globalization;
using System.Collections;
namespace System.Web.Utils
{
public class WebEqualComparer : IComparer
{
private static IComparer defC;
public WebEqualComparer()
{
}
public static IComparer Default
{
get
{
if(defC == null)
{
defC = new WebEqualComparer();
}
return defC;
}
}
/// <summary>
/// To compare two strings
/// </summary>
/// <remarks>
/// Cannot apply String.Compare(..) since I am at web
/// </remarks>
int IComparer.Compare(object left, object right)
{
string leftStr, rightStr;
leftStr = null;
rightStr = null;
if(left is string)
{
leftStr = (string)left;
}
if(right is string)
{
rightStr = (string)right;
}
if(leftStr==null || rightStr==null)
{
throw new ArgumentException();
}
int ll = leftStr.Length;
int lr = rightStr.Length;
if(ll==0 && lr==0)
{
return 0;
}
if(ll==0 || lr==0)
{
return ( (ll > 0) ? 1 : -1);
}
char cl,cr;
int i=0;
for(i=0; i < leftStr.Length; i++)
{
if(i==lr)
{
return 1;
}
cl = leftStr[i];
cr = leftStr[i];
if(cl==cr)
{
continue;
}
UnicodeCategory ucl = Char.GetUnicodeCategory(cl);
UnicodeCategory ucr = Char.GetUnicodeCategory(cr);
if(ucl==ucr)
{
return ( (cl > cr) ? 1 : -1 );
}
cl = Char.ToLower(cl);
cr = Char.ToLower(cr);
if(cl!=cr)
{
return ( (cl > cr) ? 1 : -1);
}
}
return ( (i==lr) ? 0 : -1 );
}
}
}
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