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/*
* The Mana Client
* Copyright (C) 2004-2009 The Mana World Development Team
* Copyright (C) 2009-2012 The Mana Developers
*
* This file is part of The Mana Client.
*
* 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
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef RESOURCE_H
#define RESOURCE_H
#include <ctime>
#include <string>
/**
* A generic reference counted resource object.
*/
class Resource
{
friend class ResourceManager;
public:
enum OrphanPolicy {
DeleteLater,
DeleteImmediately
};
Resource() = default;
/**
* Increments the internal reference count.
*/
void incRef() { ++mRefCount; }
/**
* Decrements the reference count. When no references are left, either
* schedules the object for deletion or deletes it immediately,
* depending on the \a orphanPolicy.
*/
void decRef(OrphanPolicy orphanPolicy = DeleteLater);
/**
* Return the path identifying this resource.
*/
const std::string &getIdPath() const
{ return mIdPath; }
protected:
virtual ~Resource() = default;
private:
std::string mIdPath; /**< Path identifying this resource. */
time_t mTimeStamp; /**< Time at which the resource was orphaned. */
unsigned mRefCount = 0; /**< Reference count. */
};
/**
* Automatically counting Resource reference.
*/
template<typename RESOURCE>
class ResourceRef
{
public:
// Allow implicit construction from RESOURCE *
ResourceRef(RESOURCE *resource = nullptr)
: mResource(resource)
{
if (mResource)
mResource->incRef();
}
// Copy constructor
ResourceRef(const ResourceRef &other)
: mResource(other.mResource)
{
if (mResource)
mResource->incRef();
}
// Move constructor
ResourceRef(ResourceRef &&other)
: mResource(other.mResource)
{
other.mResource = nullptr;
}
// Destructor
~ResourceRef()
{
if (mResource)
mResource->decRef();
}
// Assignment operator
ResourceRef &operator=(const ResourceRef &other)
{
if (this != &other)
{
if (mResource)
mResource->decRef();
mResource = other.mResource;
if (mResource)
mResource->incRef();
}
return *this;
}
// Move assignment operator
ResourceRef &operator=(ResourceRef &&other)
{
if (this != &other)
{
if (mResource)
mResource->decRef();
mResource = other.mResource;
other.mResource = nullptr;
}
return *this;
}
// Allow dereferencing
RESOURCE *operator->() const
{ return mResource; }
RESOURCE *get() const
{ return mResource; }
// Allow implicit conversion to RESOURCE *
operator RESOURCE *() const
{ return mResource; }
/**
* Releases the resource without decrementing the reference count!
*
* This is currently necessary to avoid calls to decRef on instances of
* SubImage, which are not reference counted resources.
*/
void release()
{ mResource = nullptr; }
private:
RESOURCE *mResource;
};
#endif
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