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// Copyright (C) 2001-2005 Open Source Telecom Corporation.
// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.
//
// 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.

/**
 * @file objlink.h
 * @short Template for creating linked list of objects with lookup.
 **/

#ifndef CCXX_OBJLINK_H
#define CCXX_OBJLINK_H
#include <cstddef>

#ifdef  CCXX_NAMESPACES
namespace ost {
#endif

/**
 * Used to create and manage a single linked list of objects of a common
 * type.  The list of created objects can be examined to find a key by
 * an identifier.
 *
 * @author David Sugar <dyfet@gnutelephony.org>
 * @short single linked list searchable template chain.
 */
template <class T, typename K>
class objList {
protected:
    static T* objFirst;
    T* objNext;
    const K objKey;

    objList(const K key)
    {
        objKey = key;
        objNext = objFirst;
        objFirst = (T *)this;
    }
public:
    static T* getObject(const K& key);
};

template <class T, typename K>
T *objList<T, K>::objFirst = NULL;

template <class T, typename K>
T *objList<T, K>::getObject(const K& key)
{
    T *obj = objList<T, K>::objFirst;
    while(obj) {
        if(key == obj->objKey)
            break;
        obj = obj->objNext;
    }
    return obj;
}

#ifdef  CCXX_NAMESPACES
}
#endif

#endif