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//
// System.Collections.CaseInsensitiveHashCodeProvider
//
// Author:
// Sergey Chaban (serge@wildwestsoftware.com)
//
using System;
using System.Collections;
namespace System.Collections {
[Serializable]
public class CaseInsensitiveHashCodeProvider : IHashCodeProvider {
private static CaseInsensitiveHashCodeProvider singleton;
// Class constructor
static CaseInsensitiveHashCodeProvider ()
{
singleton=new CaseInsensitiveHashCodeProvider ();
}
// Public instance constructor
public CaseInsensitiveHashCodeProvider ()
{
}
//
// Public static properties
//
public static CaseInsensitiveHashCodeProvider Default {
get {
return singleton;
}
}
//
// Instance methods
//
//
// IHashCodeProvider
//
[MonoTODO]
public int GetHashCode (object obj)
{
if (obj == null) {
throw new ArgumentNullException ("obj is null");
}
string str = obj as string;
if (str == null) {
// FIXME:
return 0;
}
int h = 0;
char c;
if (str.Length > 0) {
for (int i = 0;i<str.Length;i++) {
c = str [i];
if (Char.IsLetter (c))
c = Char.ToLower (c);
h = h * 31 + c;
}
}
return h;
}
} // CaseInsensitiveHashCodeProvider
}
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