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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2009 Tatsuhiro Tsujikawa
*
* 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
* (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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef D_SEQUENTIAL_PICKER_H
#define D_SEQUENTIAL_PICKER_H
#include "common.h"
#include <deque>
#include <memory>
#include <functional>
namespace aria2 {
template <typename T> class SequentialPicker {
private:
std::deque<std::unique_ptr<T>> entries_;
std::unique_ptr<T> pickedEntry_;
public:
bool isPicked() const { return pickedEntry_.get(); }
const std::unique_ptr<T>& getPickedEntry() const { return pickedEntry_; }
void dropPickedEntry() { pickedEntry_.reset(); }
bool hasNext() const { return !entries_.empty(); }
T* pickNext()
{
if (hasNext()) {
pickedEntry_ = std::move(entries_.front());
entries_.pop_front();
return pickedEntry_.get();
}
return nullptr;
}
void pushEntry(std::unique_ptr<T> entry)
{
entries_.push_back(std::move(entry));
}
size_t countEntryInQueue() const { return entries_.size(); }
bool isPicked(const std::function<bool(const T&)>& pred) const
{
return pickedEntry_ && pred(*pickedEntry_);
}
bool isQueued(const std::function<bool(const T&)>& pred) const
{
for (auto& e : entries_) {
if (pred(*e)) {
return true;
}
}
return false;
}
};
} // namespace aria2
#endif // D_SEQUENTIAL_PICKER_H
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