/* === S Y N F I G ========================================================= */

/*!	\file synfig/rendering/resource.cpp

**	\brief Resource

**

**	$Id$

**

**	\legal

**	......... ... 2015 Ivan Mahonin

**

**	This package 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 package 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.

**	\endlegal

*/

/* ========================================================================= */

/* === H E A D E R S ======================================================= */

#ifdef USING_PCH

#	include "pch.h"

#else

#ifdef HAVE_CONFIG_H

#	include <config.h></config.h>

#endif

#include "resource.h"

#endif

using namespace synfig;

using namespace rendering;

/* === M A C R O S ========================================================= */

/* === G L O B A L S ======================================================= */

/* === P R O C E D U R E S ================================================= */

/* === M E T H O D S ======================================================= */

Resource::Id Resource::last_id = 0;

Resource::Storage::Storage(): refcount(0) { }

Resource::Storage::~Storage() { }

void

Resource::Storage::ref() const

{

	++refcount;

}

bool

Resource::Storage::unref_inactive() const

{

	return --refcount > (int)resources.size();

}

bool

Resource::Storage::unref() const

{

	if (--refcount > (int)resources.size())

	{

		refcount = 0;

		const_cast<storage*>(this)->resources.clear();</storage*>

		#ifdef ETL_SELF_DELETING_SHARED_OBJECT

		delete this;

		#endif

		return false;

	}

	return true;

}

int

Resource::Storage::count() const

{

	return refcount;

}

void

Resource::set_alternative(Handle other) const

{

	assert(other);

	if (alternatives && other->alternatives)

	{

		if (alternatives != other->alternatives)

		{

			if (other->alternatives->resources.size() > alternatives->resources.size())

				{ other->set_alternative(Handle(const_cast<resource*>(this))); }</resource*>

			else

			{

				// merge

				Storage::Handle other_alternatives = other->alternatives;

				while(!other->alternatives->resources.empty())

				{

					alternatives->resources.push_back(

						other->alternatives->resources.back() );

					other_alternatives->resources.pop_back();

					other->alternatives = alternatives;

				}

			}

		}

	}

	else

	if (alternatives)

	{

		// add

		other->alternatives = alternatives;

		alternatives->resources.push_back(other);

	}

	else

	if (other->alternatives)

		{ other->set_alternative(Handle(const_cast<resource*>(this))); }</resource*>

	else

	{

		// new storage

		alternatives = new Storage();

		alternatives->resources.push_back(Handle(const_cast<resource*>(this)));</resource*>

		alternatives->resources.push_back(other);

	}

}

void

Resource::unset_alternative() const

{

	if (alternatives)

	{

		List &resources = alternatives->resources;

		for(List::iterator i = resources.begin(); i != resources.end(); ++i)

			if (i->get() == this)

				{ resources.erase(i); break; }

		alternatives.reset();

	}

}

/* === E N T R Y P O I N T ================================================= */