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#ifndef __ardour_configuration_variable_h__
#define __ardour_configuration_variable_h__
#include <sstream>
#include <ostream>
#include <pbd/xml++.h>
namespace ARDOUR {
class ConfigVariableBase {
public:
ConfigVariableBase (std::string str) : _name (str), _is_user (false) {}
virtual ~ConfigVariableBase() {}
std::string name() const { return _name; }
bool is_user() const { return _is_user; }
void set_is_user (bool yn) { _is_user = yn; }
virtual void add_to_node (XMLNode& node) = 0;
virtual bool set_from_node (const XMLNode& node) = 0;
protected:
std::string _name;
bool _is_user;
};
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 void set (T val) {
value = val;
}
T get() const {
return value;
}
void add_to_node (XMLNode& node) {
std::stringstream ss;
ss << value;
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) {
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;
return true;
}
}
}
}
}
return false;
}
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) {}
void set (T val) {
unmutated_value = val;
ConfigVariable<T>::set (mutator (val));
}
protected:
virtual T get_for_save() { return unmutated_value; }
T unmutated_value;
T (*mutator)(T);
};
}
#endif /* __ardour_configuration_variable_h__ */
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