Aegisub/src/factory_manager.h

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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
/// @file factory_manager.h
/// @brief Template/base-class for factory classes
/// @ingroup utility
///
#pragma once
#include <algorithm>
#include <map>
#include <memory>
#include <string>
#include <vector>
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namespace agi { class ProgressSink; }
template<typename Base, typename... Args>
class Factory {
typedef Base *(*func)(Args const&...);
typedef std::map<std::string, std::pair<bool, func>> map;
static map& classes() {
static map classes;
return classes;
}
public:
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static std::vector<std::string> GetClasses(std::string favorite="") {
std::vector<std::string> list;
std::string cmp;
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for (auto& c : favorite) c = ::tolower(c);
for (auto const& cls : classes()) {
cmp.clear();
std::transform(cls.first.begin(), cls.first.end(), std::back_inserter(cmp), ::tolower);
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if (cmp == favorite)
list.insert(list.begin(), cls.first);
else if (!cls.second.first)
list.push_back(cls.first);
}
return list;
}
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static std::unique_ptr<Base> Create(std::string const& name, Args const&... args) {
auto factory = classes().find(name);
if (factory == classes().end()) return nullptr;
return std::unique_ptr<Base>(factory->second.second(args...));
}
template<class T>
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static void Register(std::string name, bool hide = false, std::vector<std::string> subtypes = {}) {
func factory = [](Args const&... args) -> Base * { return new T(args...); };
if (subtypes.empty())
classes().insert(std::make_pair(name, std::make_pair(hide, factory)));
else {
for (auto const& subtype : subtypes)
classes().insert(std::make_pair(name + '/' + subtype, std::make_pair(hide, factory)));
}
}
};