1 /* 2 * Copyright (c) 2018, Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included 12 * in all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 */ 22 23 #ifndef _CM_EXTENSION_CREATOR_H_ 24 #define _CM_EXTENSION_CREATOR_H_ 25 26 static const int priorityNum = 4; 27 28 template <class T> 29 class CmExtensionCreator 30 { 31 typedef T* (*Creator)(); 32 33 public: 34 template <class C> 35 static bool RegisterClass(int priority = 0) 36 { 37 if (priority >= priorityNum) 38 { 39 return false; 40 } 41 Creator *c = GetCreators(); 42 c[priority] = Create<C>; 43 return true; 44 } 45 CreateClass()46 static T* CreateClass() 47 { 48 Creator *c = GetCreators(); 49 for (int i = priorityNum - 1; i >= 0; i--) 50 { 51 if (c[i] != nullptr) 52 { 53 return c[i](); 54 } 55 } 56 return nullptr; 57 } 58 59 private: GetCreators()60 static Creator* GetCreators() 61 { 62 static Creator m_creators[priorityNum]; 63 return m_creators; 64 } 65 66 template <class C> Create()67 static T* Create() 68 { 69 return new C; 70 } 71 }; 72 #endif 73