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/*
Copyright (C) 2007 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __lib_pbd_functor_command_h__
#define __lib_pbd_functor_command_h__
#include <iostream>
#include <sstream>
#include <string>
#include <map>
#include <pbd/xml++.h>
#include <pbd/shiva.h>
#include <pbd/command.h>
#include <pbd/failed_constructor.h>
/** This command class is initialized
*/
namespace PBD {
template <class obj_type, class arg_type>
class FunctorCommand : public Command
{
private:
typedef void (obj_type::*functor_type)(arg_type);
typedef std::map< std::string, functor_type > FunctorMap;
typedef typename FunctorMap::iterator FunctorMapIterator;
public:
FunctorCommand(
std::string functor,
obj_type object,
arg_type b,
arg_type a
) : functor_name(functor),
object(object),
before(b),
after(a)
{
method = find_functor(functor);
/* catch destruction of the object */
new PBD::Shiva< obj_type, FunctorCommand<obj_type, arg_type> > (object, *this);
}
~FunctorCommand() {
GoingAway();
}
void operator() () {
(object.*method) (after);
}
void undo() {
(object.*method) (before);
}
virtual XMLNode &get_state() {
std::stringstream ss;
XMLNode *node = new XMLNode("FunctorCommand");
node->add_property("functor", functor_name);
ss << before;
node->add_property("before", ss.str());
ss.clear ();
ss << after;
node->add_property("after", ss.str());
return *node;
}
static void register_functor(std::string name, functor_type f) {
functor_map[name] = f;
}
private:
static functor_type find_functor(std::string name) {
FunctorMapIterator iter;
if((iter = functor_map.find(name)) == functor_map.end()) {
throw failed_constructor();
}
return iter->second;
}
protected:
std::string functor_name;
obj_type &object;
arg_type before;
arg_type after;
functor_type method;
static FunctorMap functor_map;
};
// static initialization of functor_map...
template <class obj_type, class arg_type>
typename FunctorCommand<obj_type, arg_type>::FunctorMap
FunctorCommand<obj_type, arg_type>::functor_map;
};
#endif // __lib_pbd_functor_command_h__
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