00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation. 00002 // Copyright (C) 2006-2008 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 #include <cc++/strchar.h> 00048 00049 namespace ost { 00050 00059 template <class T, class K, unsigned S> 00060 class objMap { 00061 protected: 00062 static T *objIndex[S]; 00063 T* objNext; 00064 const K objKey; 00065 00066 virtual unsigned keyIndex(K k) 00067 { 00068 unsigned idx = 0; 00069 unsigned char *p = (unsigned char *)&k; 00070 unsigned len = sizeof(K); 00071 00072 while(len--) { 00073 idx ^= (idx << 1) ^ *p; 00074 ++p; 00075 } 00076 return idx % S; 00077 } 00078 00079 inline unsigned getSize(void) 00080 {return S;} 00081 00082 objMap(const K key) 00083 { 00084 unsigned idx = keyIndex(key); 00085 objKey = key; 00086 objNext = objIndex[idx]; 00087 objIndex[idx] = (T *)this; 00088 } 00089 public: 00090 static T *getObject(keystring key); 00091 }; 00092 00093 template <class T, unsigned S> 00094 class keyMap : public objMap<T, keystring, S> 00095 { 00096 keyMap(keystring key) : objMap<T, keystring, S>(key) {}; 00097 00098 unsigned keyIndex(keystring k) 00099 { 00100 unsigned idx = 0; 00101 while(*k) { 00102 idx = (idx << 1) ^ (unsigned)*k; 00103 ++k; 00104 } 00105 return idx % S; 00106 } 00107 }; 00108 00109 template <class T, class K, unsigned S> 00110 T *objMap<T, K, S>::objIndex[S](0); 00111 00112 template <class T, class K, unsigned S> 00113 T *objMap<T, K, S>::getObject(const keystring key) 00114 { 00115 T *obj = objIndex[keyIndex(key)]; 00116 while(obj) { 00117 if(key == obj->objKey) 00118 break; 00119 obj = obj->objNext; 00120 } 00121 return obj; 00122 } 00123 00124 } // namespace