// Copyright (C) 2001 Open Source Telecom Corporation.
//  
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software 
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// As a special exception to the GNU General Public License, permission is 
// granted for additional uses of the text contained in its release 
// of Common C++.
// 
// The exception is that, if you link the Common C++ library with other
// files to produce an executable, this does not by itself cause the
// resulting executable to be covered by the GNU General Public License.
// Your use of that executable is in no way restricted on account of
// linking the Common C++ library code into it.
// 
// This exception does not however invalidate any other reasons why
// the executable file might be covered by the GNU General Public License.
// 
// This exception applies only to the code released under the 
// name Common C++.  If you copy code from other releases into a copy of
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
// 
// If you write modifications of your own for Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.  

#include <cc++/strchar.h>

namespace ost {

template <class T, class K, unsigned S>
class objMap {
protected:
	static T *objIndex[S];
	T* objNext;
	const K objKey;

	virtual unsigned keyIndex(K k)
	{
		unsigned idx = 0;
		unsigned char *p = (unsigned char *)&k;
		unsigned len = sizeof(K);

		while(len--)
		{
			idx ^= (idx << 1) ^ *p;
			++p;
		}	
		return idx % S;		
	}

	inline unsigned getSize(void)
	{
		return S;
	}

	objMap(const K key)
	{
		unsigned idx = keyIndex(key);
		objKey = key;
		objNext = objIndex[idx];
		objIndex[idx] = (T *)this;
	}
public:
	static T *getObject(keystring key);
};

template <class T, unsigned S>
class keyMap : public objMap<T, keystring, S>
{
	keyMap(keystring key) : objMap<T, keystring, S>(key) {};
	
	unsigned keyIndex(keystring k)
	{
		unsigned idx = 0;
		while(*k)
		{
			idx = (idx << 1) ^ (unsigned)*k;
			++k;
		}
		return idx % S;
	}
};

template <class T, class K, unsigned S>
  T *objMap<T, K, S>::objIndex[S](0);

template <class T, class K, unsigned S>
T *objMap<T, K, S>::getObject(const keystring key)
{
	T *obj = objIndex[keyIndex(key)];
	while(obj)
	{
		if(key == obj->objKey)
			break;
		obj = obj->objNext;
	}
	return obj;
}	 

}
