base/Serializable

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/****************************************************************************
  Copyright (C)1996 David Jung <opensim@pobox.com>

  This program/file 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. (http://www.gnu.org)
  
  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
  
  $Id: Serializable 1029 2004-02-11 20:45:54Z jungd $
  $Revision: 1.4 $
  $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

#ifndef _BASE_SERIALIZABLE_
#define _BASE_SERIALIZABLE_

#include <base/base>
#include <base/Object>

#include <map>


namespace base {

class Serializer;

class Serializable : public virtual base::Object
{
public:

  virtual void serialize(Serializer& s) = 0; ///< read or write object state to Serializer

  // the following types and methods allow serialization of concrete derived class
  //  objects via a ref<> to their, possibly abstract, base class type

  class SerializableInstantiator {
  public:
    virtual Serializable* newSerializable() const = 0;
  };

  template<class SerializableDerived>
  class SerializableDerivedInstantiator : public SerializableInstantiator
  {
  public:
    virtual Serializable* newSerializable() const { 
      return NewObj SerializableDerived();
    }
  };

  template<class BaseClass, class DerivedClass>
  static void registerSerializableInstantiator(const SerializableInstantiator& instantiator)
  {
    registerSerializableInstantiator(base::className(typeid(BaseClass)), 
                                     base::className(typeid(DerivedClass)),
                                     instantiator);
  }
  

  template<class BaseClass>
  static const SerializableInstantiator& getSerializableInstantiator(const String& derivedClassTypeName)
  {
    return getSerializableInstantiator(base::className(typeid(BaseClass)),
                                       derivedClassTypeName); 
  }


  static void registerSerializableInstantiator(const String& baseClassTypeName, 
                                               const String& derivedClassTypeName,
                                               const SerializableInstantiator& instantiator);

  static const SerializableInstantiator& getSerializableInstantiator(const String& baseClassTypeName,
                                                                     const String& derivedClassTypeName);

private:
  typedef std::pair<String, const SerializableInstantiator*> BaseAndInstantiatorPair;
  typedef std::map<String, BaseAndInstantiatorPair > DerivedClassMap;
  static DerivedClassMap derivedClasses;
};

} // base

#endif

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