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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 __libpbd_configuration_variable_h__
#define __libpbd_configuration_variable_h__
#include <iostream>
#include <sstream>
#include <string>
#include "pbd/xml++.h"
#include "pbd/convert.h"
#include "pbd/libpbd_visibility.h"
namespace PBD {
class LIBPBD_API 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;
protected:
std::string _name;
void notify ();
void miss ();
};
template<class T>
class /*LIBPBD_API*/ 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::ostringstream ss;
ss << value;
return ss.str ();
}
virtual bool set (T val) {
if (val == value) {
miss ();
return false;
}
value = val;
notify ();
return true;
}
virtual 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;
};
/** Specialisation of ConfigVariable to deal with float (-inf etc) */
template<> void
ConfigVariable<float>::set_from_string (std::string const & s);
/** Specialisation of ConfigVariable for std::string to cope with whitespace properly */
template<>
class /*LIBPBD_API*/ ConfigVariable<std::string> : public ConfigVariableBase
{
public:
ConfigVariable (std::string str) : ConfigVariableBase (str) {}
ConfigVariable (std::string str, std::string val) : ConfigVariableBase (str), value (val) {}
std::string get() const {
return value;
}
std::string get_as_string () const {
return value;
}
virtual bool set (std::string val) {
if (val == value) {
miss ();
return false;
}
value = val;
notify ();
return true;
}
virtual void set_from_string (std::string const & s) {
value = s;
}
protected:
virtual std::string get_for_save() { return value; }
std::string value;
};
template<>
class /*LIBPBD_API*/ ConfigVariable<bool> : public ConfigVariableBase
{
public:
ConfigVariable (std::string str) : ConfigVariableBase (str), value (false) {}
ConfigVariable (std::string str, bool val) : ConfigVariableBase (str), value (val) {}
bool get() const {
return value;
}
std::string get_as_string () const {
std::ostringstream ss;
ss << value;
return ss.str ();
}
virtual bool set (bool val) {
if (val == value) {
miss ();
return false;
}
value = val;
notify ();
return true;
}
void set_from_string (std::string const & s) {
value = PBD::string_is_affirmative (s);
}
protected:
virtual bool get_for_save() { return value; }
bool value;
};
template<class T>
class /*LIBPBD_API*/ ConfigVariableWithMutation : public ConfigVariable<T>
{
public:
ConfigVariableWithMutation (std::string name, T val, T (*m)(T))
: ConfigVariable<T> (name, m (val)), unmutated_value (val), mutator (m) {}
bool set (T val) {
if (unmutated_value != val) {
unmutated_value = val;
return ConfigVariable<T>::set (mutator (val));
}
return false;
}
void set_from_string (std::string const & s) {
T v;
std::stringstream ss;
ss << s;
ss >> v;
set (v);
}
protected:
virtual T get_for_save() { return unmutated_value; }
T unmutated_value;
T (*mutator)(T);
};
template<>
class /*LIBPBD_API*/ ConfigVariableWithMutation<std::string> : public ConfigVariable<std::string>
{
public:
ConfigVariableWithMutation (std::string name, std::string val, std::string (*m)(std::string))
: ConfigVariable<std::string> (name, val), mutator (m) {}
bool set (std::string val) {
if (unmutated_value != val) {
unmutated_value = val;
return ConfigVariable<std::string>::set (mutator (val));
}
return false;
}
void set_from_string (std::string const & s) {
set (s);
}
protected:
virtual std::string get_for_save() { return unmutated_value; }
std::string unmutated_value;
std::string (*mutator)(std::string);
};
}
#endif /* __libpbd_configuration_variable_h__ */
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