GNU CommonC++
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00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation. 00002 // Copyright (C) 2006-2010 David Sugar, Tycho Softworks. 00003 // 00004 // This program is free software; you can redistribute it and/or modify 00005 // it under the terms of the GNU General Public License as published by 00006 // the Free Software Foundation; either version 2 of the License, or 00007 // (at your option) any later version. 00008 // 00009 // This program is distributed in the hope that it will be useful, 00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 // GNU General Public License for more details. 00013 // 00014 // You should have received a copy of the GNU General Public License 00015 // along with this program; if not, write to the Free Software 00016 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00017 // 00018 // As a special exception to the GNU General Public License, permission is 00019 // granted for additional uses of the text contained in its release 00020 // of Common C++. 00021 // 00022 // The exception is that, if you link the Common C++ library with other 00023 // files to produce an executable, this does not by itself cause the 00024 // resulting executable to be covered by the GNU General Public License. 00025 // Your use of that executable is in no way restricted on account of 00026 // linking the Common C++ library code into it. 00027 // 00028 // This exception does not however invalidate any other reasons why 00029 // the executable file might be covered by the GNU General Public License. 00030 // 00031 // This exception applies only to the code released under the 00032 // name Common C++. If you copy code from other releases into a copy of 00033 // Common C++, as the General Public License permits, the exception does 00034 // not apply to the code that you add in this way. To avoid misleading 00035 // anyone as to the status of such modified files, you must delete 00036 // this exception notice from them. 00037 // 00038 // If you write modifications of your own for Common C++, it is your choice 00039 // whether to permit this exception to apply to your modifications. 00040 // If you do not wish that, delete this exception notice. 00041 00047 #ifndef CCXX_OBJMAP_H 00048 #define CCXX_OBJMAP_H 00049 00050 #include <cc++/strchar.h> 00051 00052 #ifdef CCXX_NAMESPACES 00053 namespace ost { 00054 #endif 00055 00064 template <class T, class K, unsigned S> 00065 class objMap { 00066 protected: 00067 static T *objIndex[S]; 00068 T* objNext; 00069 const K objKey; 00070 00071 virtual unsigned keyIndex(K k) 00072 { 00073 unsigned idx = 0; 00074 unsigned char *p = (unsigned char *)&k; 00075 unsigned len = sizeof(K); 00076 00077 while(len--) { 00078 idx ^= (idx << 1) ^ *p; 00079 ++p; 00080 } 00081 return idx % S; 00082 } 00083 00084 inline unsigned getSize(void) 00085 {return S;} 00086 00087 objMap(const K key) 00088 { 00089 unsigned idx = keyIndex(key); 00090 objKey = key; 00091 objNext = objIndex[idx]; 00092 objIndex[idx] = (T *)this; 00093 } 00094 public: 00095 static T *getObject(keystring key); 00096 }; 00097 00098 template <class T, unsigned S> 00099 class keyMap : public objMap<T, keystring, S> 00100 { 00101 keyMap(keystring key) : objMap<T, keystring, S>(key) {}; 00102 00103 unsigned keyIndex(keystring k) 00104 { 00105 unsigned idx = 0; 00106 while(*k) { 00107 idx = (idx << 1) ^ (unsigned)*k; 00108 ++k; 00109 } 00110 return idx % S; 00111 } 00112 }; 00113 00114 template <class T, class K, unsigned S> 00115 T *objMap<T, K, S>::objIndex[S](0); 00116 00117 template <class T, class K, unsigned S> 00118 T *objMap<T, K, S>::getObject(const keystring key) 00119 { 00120 T *obj = objIndex[keyIndex(key)]; 00121 while(obj) { 00122 if(key == obj->objKey) 00123 break; 00124 obj = obj->objNext; 00125 } 00126 return obj; 00127 } 00128 00129 #ifdef CCXX_NAMESPACES 00130 } // namespace 00131 #endif 00132 00133 #endif