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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QDENGINE_QDCORE_QD_RESOURCE_DISPATCHER_H
#define QDENGINE_QDCORE_QD_RESOURCE_DISPATCHER_H
#include "qdengine/qdcore/qd_resource.h"
namespace QDEngine {
//! Диспетчер ресурсов.
template<class T>
class qdResourceDispatcher {
public:
qdResourceDispatcher() {}
virtual ~qdResourceDispatcher() {}
//! Регистрация ресурса.
bool register_resource(qdResource *res, const T *res_owner) {
qdResourceHandle<T> hres(res, res_owner);
typename handle_container_t::iterator it = Common::find(_handles.begin(), _handles.end(), hres);
if (it != _handles.end()) return false;
_handles.push_back(hres);
return true;
}
//! Отмена регистрации ресурса.
bool unregister_resource(qdResource *res, const T *res_owner) {
qdResourceHandle<T> hres(res, res_owner);
typename handle_container_t::iterator it = Common::find(_handles.begin(), _handles.end(), hres);
if (it != _handles.end()) {
_handles.erase(it);
return true;
}
return false;
}
//! Возвращает true, если ресурс res (опционально - с владельцем res_owner) есть в списке.
bool is_registered(const qdResource *res, const T *res_owner = NULL) const {
if (res_owner) {
qdResourceHandle<T> hres(const_cast<qdResource *>(res), res_owner);
typename handle_container_t::const_iterator it = Common::find(_handles.begin(), _handles.end(), hres);
return (it != _handles.end());
} else {
typename handle_container_t::const_iterator it = Common::find(_handles.begin(), _handles.end(), *res);
return (it != _handles.end());
}
}
const T *find_owner(const qdResource *res) const {
typename handle_container_t::const_iterator it = Common::find(_handles.begin(), _handles.end(), *res);
if (_handles.end() == it) return NULL;
return (*it).resource_owner();
}
//! Загружает в память данные для ресурсов.
void load_resources(const T *owner = NULL) const {
if (owner) {
for (typename handle_container_t::const_iterator it = _handles.begin(); it != _handles.end(); ++it) {
if (it->resource_owner() == owner)
it->load_resource();
}
} else {
for (typename handle_container_t::const_iterator it = _handles.begin(); it != _handles.end(); ++it)
it->load_resource();
}
}
//! Выгружает из памяти данные ресурсов.
void release_resources(const T *owner = NULL, const T *hold_owner = NULL) const {
if (owner) {
for (typename handle_container_t::const_iterator it = _handles.begin(); it != _handles.end(); ++it) {
if (it->resource_owner() == owner && (!hold_owner || !is_registered(it->resource(), hold_owner)))
it->release_resource();
}
} else {
if (hold_owner) {
for (typename handle_container_t::const_iterator it = _handles.begin(); it != _handles.end(); ++it) {
if (it->resource_owner() != hold_owner)
it->release_resource();
}
} else {
for (typename handle_container_t::const_iterator it = _handles.begin(); it != _handles.end(); ++it)
it->release_resource();
}
}
}
//! Загружает в память данные ресурса, если они еще не загружены.
bool load_resource(qdResource *res, const T *res_owner) {
qdResourceHandle<T> hres(res, res_owner);
register_resource(res, res_owner);
return hres.load_resource();
}
//! Выгружает из памяти данные ресурса, если на него нет больше ссылок.
bool release_resource(qdResource *res, const T *res_owner) {
unregister_resource(res, res_owner);
if (!is_registered(res)) {
qdResourceHandle<T> hres(res, res_owner);
return hres.release_resource();
}
return false;
}
protected:
//! Хэндл для управления ресурсами.
template<class U>
class qdResourceHandle {
public:
qdResourceHandle(qdResource *res, const U *res_owner) : _resource(res), _resource_owner(res_owner) {}
qdResourceHandle(const qdResourceHandle<U> &h) : _resource(h._resource), _resource_owner(h._resource_owner) {}
~qdResourceHandle() {}
qdResourceHandle<U> &operator = (const qdResourceHandle<U> &h) {
if (this == &h) return *this;
_resource = h._resource;
_resource_owner = h._resource_owner;
return *this;
}
bool operator == (const qdResource &res) const {
return (_resource == &res);
}
bool operator == (const qdResourceHandle<U> &h) const {
return (_resource == h._resource && _resource_owner == h._resource_owner);
}
//! Возвращает указатель на ресурс.
qdResource *resource() const {
return _resource;
}
//! Возвращает указатель на владельца ресурса.
const U *resource_owner() const {
return _resource_owner;
}
//! Загружает ресурс в память.
bool load_resource() const {
if (!_resource->is_resource_loaded())
return _resource->load_resource();
return true;
}
//! Выгружает ресурс из памяти.
bool release_resource() const {
if (_resource->is_resource_loaded())
return _resource->free_resource();
return true;
}
private:
//! Указатель на ресурс.
mutable qdResource *_resource;
//! Указатель на владельца ресурса.
const T *_resource_owner;
};
typedef Std::list< qdResourceHandle<T> > handle_container_t;
//! Хэндлы ресурсов.
handle_container_t _handles;
};
} // namespace QDEngine
#endif // QDENGINE_QDCORE_QD_RESOURCE_DISPATCHER_H
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