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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@808 a592a061-630c-0410-9148-cb99ea01b6c8
128 lines
3.4 KiB
C++
128 lines
3.4 KiB
C++
/*
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* Automatic object hierarchy externalization for XTL
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*
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* Copyright (C) 1998-2000 Jose' Orlando Pereira, Universidade do Minho
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*/
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/* XTL - eXternalization Template Library - http://gsd.di.uminho.pt/~jop/xtl
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* Copyright (C) 1998-2000 Jose' Orlando Pereira, Universidade do Minho
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA
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*
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* Id: autoio.h 1.4 Fri, 05 May 2000 18:57:58 +0100 jop
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*/
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#ifndef __XTL_AUTOIO
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#define __XTL_AUTOIO
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#include <xtl/objio.h>
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#include <xtl/vobjio.h>
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#include <map>
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#include <stdexcept>
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class reader;
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typedef std::map<int, reader*> externalizable_index;
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class externalizable_base;
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class reader {
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private:
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int id;
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public:
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reader(int i, std::map<int, reader*>& repo):id(i) {
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std::map<int, reader*>::const_iterator t=repo.find(id);
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if (t!=repo.end())
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throw std::logic_error("registering duplicate class id");
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repo.insert(std::make_pair(id, this));
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}
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virtual externalizable_base* read(obj_input<v_format>& stream)=0;
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int classid() const {return id;}
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};
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template <class T>
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class concrete_reader: public reader {
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public:
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concrete_reader(int i, std::map<int, reader*>& repo):reader(i, repo) {}
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virtual externalizable_base* read(obj_input<v_format>& stream) {
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T* ptr=new T;
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ptr->vcomposite(stream);
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return ptr;
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}
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};
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class externalizable_base {
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public:
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int classid() const {return info().classid();}
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virtual reader& info() const=0;
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virtual void vcomposite(obj_output<v_format>& stream) const=0;
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virtual void vcomposite(obj_input<v_format>& stream)=0;
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};
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class auto_obj_input: public obj_input<v_format> {
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private:
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const std::map<int, reader*>& repo;
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public:
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auto_obj_input(v_format& f, const std::map<int, reader*>& r):
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obj_input<v_format>(f), repo(r) {}
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template <class T>
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auto_obj_input& auto_object(T*& data) {
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int id=0;
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simple(id);
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std::map<int, reader*>::const_iterator t=repo.find(id);
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if (t==repo.end())
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throw std::logic_error("unknown class id");
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externalizable_base* ptr=(*t).second->read(*this);
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data=dynamic_cast<T*>(ptr);
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return *this;
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}
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};
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class auto_obj_output: public obj_output<v_format> {
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public:
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auto_obj_output(v_format& f):obj_output<v_format>(f) {}
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template <class T>
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auto_obj_output& auto_object(T*& data) {
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const externalizable_base* ptr=data;
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int id=ptr->classid();
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simple(id);
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ptr->vcomposite(*this);
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return *this;
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}
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};
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#define decl_externalizable(name)\
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public:\
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virtual reader& info() const {return myinfo;}\
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virtual void vcomposite(obj_output<v_format>& stream) const\
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{const_cast<name*>(this)->composite(stream);}\
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virtual void vcomposite(obj_input<v_format>& stream)\
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{composite(stream);}\
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private:\
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static concrete_reader<name> myinfo
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#define impl_externalizable(name, id, index)\
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concrete_reader<name> name::myinfo(id, index)
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#endif
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