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/***********************************************************************
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* Software License Agreement (BSD License)
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*
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* Copyright 2008-2009 Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
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* Copyright 2008-2009 David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
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*
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* THE BSD LICENSE
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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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*
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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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*************************************************************************/
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#ifndef OBJECT_FACTORY_H_
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#define OBJECT_FACTORY_H_
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#include <map>
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namespace cvflann
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{
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template<typename BaseClass, typename DerivedClass>
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BaseClass* createObject()
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{
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return new DerivedClass();
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}
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template<typename BaseClass, typename UniqueIdType>
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class ObjectFactory
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{
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typedef BaseClass* (*CreateObjectFunc)();
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std::map<UniqueIdType, CreateObjectFunc> object_registry;
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// singleton class, private constructor
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ObjectFactory() {};
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public:
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typedef typename std::map<UniqueIdType, CreateObjectFunc>::iterator Iterator;
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template<typename DerivedClass>
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bool register_(UniqueIdType id)
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{
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if (object_registry.find(id) != object_registry.end())
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return false;
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object_registry[id] = &createObject<BaseClass, DerivedClass>;
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return true;
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}
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bool unregister(UniqueIdType id)
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{
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return (object_registry.erase(id) == 1);
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}
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BaseClass* create(UniqueIdType id)
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{
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Iterator iter = object_registry.find(id);
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if (iter == object_registry.end())
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return NULL;
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return ((*iter).second)();
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}
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static ObjectFactory<BaseClass,UniqueIdType>& instance()
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{
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static ObjectFactory<BaseClass,UniqueIdType> the_factory;
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return the_factory;
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}
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};
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}
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#endif /* OBJECT_FACTORY_H_ */
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