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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 <pbd/xml++.h>
#include "ardour/utils.h"
namespace ARDOUR {
class ConfigVariableBase {
public:
enum Owner {
Default = 0x1,
System = 0x2,
Config = 0x4,
Session = 0x8,
Interface = 0x10
};
ConfigVariableBase (std::string str) : _name (str), _owner (Default) {}
virtual ~ConfigVariableBase() {}
std::string name() const { return _name; }
Owner owner() const { return _owner; }
virtual void add_to_node (XMLNode& node) = 0;
virtual bool set_from_node (const XMLNode& node, Owner owner) = 0;
void show_stored_value (const std::string&);
static void set_show_stored_values (bool yn);
protected:
std::string _name;
Owner _owner;
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) {}
virtual bool set (T val, Owner owner) {
if (val == value) {
miss ();
return false;
}
value = val;
_owner = (ConfigVariableBase::Owner)(_owner |owner);
notify ();
return true;
}
T get() const {
return value;
}
void add_to_node (XMLNode& node) {
std::stringstream ss;
ss << value;
show_stored_value (ss.str());
XMLNode* child = new XMLNode ("Option");
child->add_property ("name", _name);
child->add_property ("value", ss.str());
node.add_child_nocopy (*child);
}
bool set_from_node (const XMLNode& node, Owner owner) {
if (node.name() == "Config") {
/* ardour.rc */
const XMLProperty* prop;
XMLNodeList nlist;
XMLNodeConstIterator niter;
XMLNode* child;
nlist = node.children();
for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
child = *niter;
if (child->name() == "Option") {
if ((prop = child->property ("name")) != 0) {
if (prop->value() == _name) {
if ((prop = child->property ("value")) != 0) {
std::stringstream ss;
ss << prop->value();
ss >> value;
_owner = (ConfigVariableBase::Owner)(_owner |owner);
return true;
}
}
}
}
}
} else if (node.name() == "Options") {
/* session file */
XMLNodeList olist;
XMLNodeConstIterator oiter;
XMLNode* option;
const XMLProperty* opt_prop;
olist = node.children();
for (oiter = olist.begin(); oiter != olist.end(); ++oiter) {
option = *oiter;
if (option->name() == _name) {
if ((opt_prop = option->property ("val")) != 0) {
std::stringstream ss;
ss << opt_prop->value();
ss >> value;
_owner = (ConfigVariableBase::Owner)(_owner |owner);
return true;
}
}
}
}
return false;
}
protected:
virtual T get_for_save() { return value; }
T value;
};
/* full specialization for bool, required because ::set_from_node() needs
special handling.
*/
template<>
class ConfigVariable<bool> : public ConfigVariableBase
{
public:
ConfigVariable (std::string str) : ConfigVariableBase (str), value (false) {}
ConfigVariable (std::string str, bool val) : ConfigVariableBase (str), value (val) {}
virtual bool set (bool val, Owner owner) {
if (val == value) {
miss ();
return false;
}
value = val;
_owner = (ConfigVariableBase::Owner)(_owner |owner);
notify ();
return true;
}
bool get() const {
return value;
}
void add_to_node (XMLNode& node) {
XMLNode* child = new XMLNode ("Option");
child->add_property ("name", _name);
child->add_property ("value", (value ? "yes" : "no"));
node.add_child_nocopy (*child);
}
bool set_from_node (const XMLNode& node, Owner owner) {
if (node.name() == "Config") {
/* ardour.rc */
const XMLProperty* prop;
XMLNodeList nlist;
XMLNodeConstIterator niter;
XMLNode* child;
nlist = node.children();
for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
child = *niter;
if (child->name() == "Option") {
if ((prop = child->property ("name")) != 0) {
if (prop->value() == _name) {
if ((prop = child->property ("value")) != 0) {
value = ::string_is_affirmative (prop->value());
_owner = (ConfigVariableBase::Owner)(_owner |owner);
return true;
}
}
}
}
}
} else if (node.name() == "Options") {
/* session file */
XMLNodeList olist;
XMLNodeConstIterator oiter;
XMLNode* option;
const XMLProperty* opt_prop;
olist = node.children();
for (oiter = olist.begin(); oiter != olist.end(); ++oiter) {
option = *oiter;
if (option->name() == _name) {
if ((opt_prop = option->property ("val")) != 0) {
value = ::string_is_affirmative (opt_prop->value());
_owner = (ConfigVariableBase::Owner)(_owner |owner);
return true;
}
}
}
}
return false;
}
protected:
virtual bool get_for_save() { return value; }
bool 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, ConfigVariableBase::Owner owner) {
if (unmutated_value != val) {
unmutated_value = val;
return ConfigVariable<T>::set (mutator (val), owner);
}
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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