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/*
Copyright (C) 2000-2007 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 __ardour_configuration_variable_h__
#define __ardour_configuration_variable_h__
#include <sstream>
#include <ostream>
#include <iostream>
#include "pbd/xml++.h"
namespace ARDOUR {
class ConfigVariableBase {
public:
ConfigVariableBase (std::string str) : _name (str) {}
virtual ~ConfigVariableBase() {}
std::string name () const { return _name; }
void add_to_node (XMLNode&);
bool set_from_node (XMLNode const &);
virtual std::string get_as_string () const = 0;
virtual void set_from_string (std::string const &) = 0;
void show_stored_value (const std::string&);
static void set_show_stored_values (bool);
protected:
std::string _name;
static bool show_stores;
void notify ();
void miss ();
};
template<class T>
class ConfigVariable : public ConfigVariableBase
{
public:
ConfigVariable (std::string str) : ConfigVariableBase (str) {}
ConfigVariable (std::string str, T val) : ConfigVariableBase (str), value (val) {}
T get() const {
return value;
}
std::string get_as_string () const {
std::stringstream ss;
ss << value;
return ss.str ();
}
virtual bool set (T val) {
if (val == value) {
miss ();
return false;
}
value = val;
notify ();
return true;
}
void set_from_string (std::string const & s) {
std::stringstream ss;
ss << s;
ss >> value;
}
protected:
virtual T get_for_save() { return value; }
T value;
};
template<class T>
class ConfigVariableWithMutation : public ConfigVariable<T>
{
public:
ConfigVariableWithMutation (std::string name, T val, T (*m)(T))
: ConfigVariable<T> (name, val), mutator (m) {}
bool set (T val) {
if (unmutated_value != val) {
unmutated_value = val;
return ConfigVariable<T>::set (mutator (val));
}
return false;
}
protected:
virtual T get_for_save() { return unmutated_value; }
T unmutated_value;
T (*mutator)(T);
};
}
#endif /* __ardour_configuration_variable_h__ */
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