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/**
* Copyright (c) Rich Hickey. All rights reserved.
* The use and distribution terms for this software are covered by the
* Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
* which can be found in the file CPL.TXT at the root of this distribution.
* By using this software in any fashion, you are agreeing to be bound by
* the terms of this license.
* You must not remove this notice, or any other, from this software.
**/
/* rich Mar 25, 2006 11:42:47 AM */
using System;
using System.Collections;
namespace clojure.lang
{
public class Symbol : Obj, IComparable{
static public readonly Hashtable table = new Hashtable(1001);
static public readonly Hashtable hashes = new Hashtable(1001);
static readonly Random rand = new Random(42);
public readonly String name;
int hash = 0;
override public String ToString()
{
return name;
}
public static Symbol intern(String name)
{
lock(table)
{
Symbol sym = (Symbol) table[name];
if(sym == null)
{
if(name[0] == ':')
sym = new Keyword(name);
else if (name[0] == '.')
sym = new Accessor(name);
else
sym = new Symbol(name);
if(table[name] != null) //defend against recursive static init
return (Symbol)table[name];
table.Add(name, sym);
}
return sym;
}
}
/**
* Used by Namespace.intern()
* @param name
* @param ns
*/
internal Symbol(String name)
{
this.name = name;
}
public override int GetHashCode()
{
if(hash == 0)
{
lock (hashes)
{
while (hash == 0)
{
int h = rand.Next();
if (h != 0 && !hashes.ContainsKey(h))
{
hash = h;
hashes.Add(h,null);
}
}
}
}
return hash;
}
#region IComparable Members
public int CompareTo(object obj)
{
return GetHashCode() - ((Symbol)obj).GetHashCode();
}
#endregion
override public Obj withMeta(IPersistentMap meta) {
this._meta = meta;
return this;
}
}
}
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