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95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
// ==============================================================
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// This file is part of Glest Shared Library (www.glest.org)
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//
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// Copyright (C) 2001-2008 Martiño Figueroa
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//
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// You can redistribute this code and/or modify it under
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// the terms of the GNU General Public License as published
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// by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version
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// ==============================================================
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#ifndef _SHARED_UTIL_FACTORY_
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#define _SHARED_UTIL_FACTORY_
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#include <map>
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#include <string>
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#include <stdexcept>
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#include "platform_util.h"
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#include "leak_dumper.h"
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using std::map;
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using std::string;
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using std::pair;
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using std::runtime_error;
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namespace Shared {
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namespace Util {
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// =====================================================
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// class SingleFactoryBase
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// =====================================================
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class SingleFactoryBase {
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public:
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virtual ~SingleFactoryBase() {
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}
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virtual void *newInstance() = 0;
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};
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// =====================================================
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// class SingleFactory
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// =====================================================
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template<typename T>
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class SingleFactory : public SingleFactoryBase {
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public:
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virtual void *newInstance() {
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return new T();
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}
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};
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// =====================================================
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// class MultiFactory
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// =====================================================
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template<typename T>
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class MultiFactory {
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private:
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typedef map<string, SingleFactoryBase*> Factories;
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typedef pair<string, SingleFactoryBase*> FactoryPair;
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private:
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Factories factories;
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public:
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virtual ~MultiFactory() {
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for (Factories::iterator it = factories.begin(); it != factories.end(); ++it) {
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delete it->second;
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}
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factories.clear();
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}
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template<typename R>
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void registerClass(string classId) {
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factories.insert(FactoryPair(classId, new SingleFactory<R>()));
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}
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T *newInstance(string classId) {
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Factories::iterator it = factories.find(classId);
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if (it == factories.end()) {
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throw megaglest_runtime_error("Unknown class identifier: " + classId);
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}
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return static_cast<T*>(it->second->newInstance());
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}
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bool isClassId(string classId) {
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return factories.find(classId) != factories.end();
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}
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};
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}
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}//end namespace
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#endif
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