171 lines
3.5 KiB
C++
171 lines
3.5 KiB
C++
/*
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* Copyright (c) 2010-2013 Juli Mallett. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef COMMON_FACTORY_H
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#define COMMON_FACTORY_H
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#include <map>
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#include <set>
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template<class C>
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class Factory {
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public:
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Factory(void)
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{ }
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virtual ~Factory()
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{ }
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virtual C *create(void) const = 0;
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};
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template<class B, class C>
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class ConstructorFactory : public Factory<B> {
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public:
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ConstructorFactory(void)
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{ }
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~ConstructorFactory()
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{ }
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B *create(void) const
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{
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return (new C());
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}
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};
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template<class B, class C, typename A>
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class ConstructorArgFactory : public Factory<B> {
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A a_;
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public:
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ConstructorArgFactory(A a)
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: a_(a)
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{ }
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~ConstructorArgFactory()
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{ }
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B *create(void) const
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{
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return (new C(a_));
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}
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};
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template<class B, class C>
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class SubclassFactory : public Factory<B> {
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Factory<C> *factory_;
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public:
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SubclassFactory(Factory<C> *factory)
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: factory_(factory)
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{ }
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~SubclassFactory()
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{
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delete factory_;
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factory_ = NULL;
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}
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B *create(void) const
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{
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return (factory_->create());
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}
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};
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template<class B, class C = B>
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struct factory {
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Factory<B> *operator() (void) const
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{
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return (new ConstructorFactory<B, C>);
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}
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template<typename T>
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Factory<B> *operator() (T arg) const
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{
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return (new ConstructorArgFactory<B, C, T>(arg));
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}
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};
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template<typename K, typename C>
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class FactoryMap {
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typedef std::map<K, Factory<C> *> map_type;
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map_type map_;
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public:
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FactoryMap(void)
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: map_()
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{ }
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~FactoryMap()
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{
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typename map_type::iterator it;
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while ((it = map_.begin()) != map_.end()) {
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delete it->second;
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map_.erase(it);
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}
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}
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C *create(const K& key) const
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{
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typename map_type::const_iterator it;
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it = map_.find(key);
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if (it == map_.end())
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return (NULL);
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return (it->second->create());
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}
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void enter(const K& key, Factory<C> *factory)
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{
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typename map_type::iterator it;
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it = map_.find(key);
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if (it != map_.end()) {
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delete it->second;
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map_.erase(it);
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}
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map_[key] = factory;
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}
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template<typename S>
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void enter(const K& key, Factory<S> *factory)
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{
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enter(key, new SubclassFactory<C, S>(factory));
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}
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std::set<K> keys(void) const
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{
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typename map_type::const_iterator it;
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std::set<K> key_set;
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for (it = map_.begin(); it != map_.end(); ++it)
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key_set.insert(it->first);
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return (key_set);
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}
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};
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#endif /* !COMMON_FACTORY_H */
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