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objmap.h

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00001 // Copyright (C) 2001 Open Source Telecom Corporation.
00002 //  
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 // 
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 // 
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software 
00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00016 // 
00017 // As a special exception to the GNU General Public License, permission is 
00018 // granted for additional uses of the text contained in its release 
00019 // of Common C++.
00020 // 
00021 // The exception is that, if you link the Common C++ library with other
00022 // files to produce an executable, this does not by itself cause the
00023 // resulting executable to be covered by the GNU General Public License.
00024 // Your use of that executable is in no way restricted on account of
00025 // linking the Common C++ library code into it.
00026 // 
00027 // This exception does not however invalidate any other reasons why
00028 // the executable file might be covered by the GNU General Public License.
00029 // 
00030 // This exception applies only to the code released under the 
00031 // name Common C++.  If you copy code from other releases into a copy of
00032 // Common C++, as the General Public License permits, the exception does
00033 // not apply to the code that you add in this way.  To avoid misleading
00034 // anyone as to the status of such modified files, you must delete
00035 // this exception notice from them.
00036 // 
00037 // If you write modifications of your own for Common C++, it is your choice
00038 // whether to permit this exception to apply to your modifications.
00039 // If you do not wish that, delete this exception notice.  
00040 
00046 #include <cc++/strchar.h>
00047 
00048 namespace ost {
00049 
00058 template <class T, class K, unsigned S>
00059 class objMap {
00060 protected:
00061         static T *objIndex[S];
00062         T* objNext;
00063         const K objKey;
00064 
00065         virtual unsigned keyIndex(K k)
00066         {
00067                 unsigned idx = 0;
00068                 unsigned char *p = (unsigned char *)&k;
00069                 unsigned len = sizeof(K);
00070 
00071                 while(len--)
00072                 {
00073                         idx ^= (idx << 1) ^ *p;
00074                         ++p;
00075                 }       
00076                 return idx % S;         
00077         }
00078 
00079         inline unsigned getSize(void)
00080         {
00081                 return S;
00082         }
00083 
00084         objMap(const K key)
00085         {
00086                 unsigned idx = keyIndex(key);
00087                 objKey = key;
00088                 objNext = objIndex[idx];
00089                 objIndex[idx] = (T *)this;
00090         }
00091 public:
00092         static T *getObject(keystring key);
00093 };
00094 
00095 template <class T, unsigned S>
00096 class keyMap : public objMap<T, keystring, S>
00097 {
00098         keyMap(keystring key) : objMap<T, keystring, S>(key) {};
00099         
00100         unsigned keyIndex(keystring k)
00101         {
00102                 unsigned idx = 0;
00103                 while(*k)
00104                 {
00105                         idx = (idx << 1) ^ (unsigned)*k;
00106                         ++k;
00107                 }
00108                 return idx % S;
00109         }
00110 };
00111 
00112 template <class T, class K, unsigned S>
00113   T *objMap<T, K, S>::objIndex[S](0);
00114 
00115 template <class T, class K, unsigned S>
00116 T *objMap<T, K, S>::getObject(const keystring key)
00117 {
00118         T *obj = objIndex[keyIndex(key)];
00119         while(obj)
00120         {
00121                 if(key == obj->objKey)
00122                         break;
00123                 obj = obj->objNext;
00124         }
00125         return obj;
00126 }        
00127 
00128 }

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