//TODO: copyrights

#include "object.h"

using namespace Devices;

static std::list<Object *>& getKnownObjects()
{
	static std::list<Object *> known_objects;
	return known_objects;
}


Object::Object(Type type, Object *parent)
	: p_references(1), p_parent(parent), p_type(type), p_release_parent(true)
{
	if(parent)
		parent->reference();

	// Add object in the list of known objects
	getKnownObjects().push_front(this);
	p_it = getKnownObjects().begin();
}

Object::~Object()
{
	if(p_parent && p_parent->dereference() && p_release_parent)
		delete p_parent;

	// Remove object from the list of known objects
	getKnownObjects().erase(p_it);
}

void Object::reference()
{
	p_references++;
}

bool Object::dereference()
{
	p_references--;
	return (p_references == 0);
}

void Object::setReleaseParent(bool release)
{
	p_release_parent = release;
}

unsigned int Object::references() const
{
	return p_references;
}

Object *Object::parent() const
{
	return p_parent;
}

Object::Type Object::type() const
{
	return p_type;
}

bool Object::isA(Object::Type type) const
{
	// Check for null values
	if(this == 0)
		return false;

	// Check that the value isn't garbage or freed pointer
	std::list<Object *>::const_iterator it = getKnownObjects().begin(),
		e = getKnownObjects().end();
	while(it != e)
	{
		if(*it == this)
			return this->type() == type;

		++it;
	}

	return false;
}