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HandleMaker.h

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00001 #ifndef TAGCOLL_HANDLE_MAKER_H 00002 #define TAGCOLL_HANDLE_MAKER_H 00003 00004 /* 00005 * Associate integer handles to strings or other kinds of items 00006 * 00007 * Copyright (C) 2003 Enrico Zini <enrico@debian.org> 00008 * 00009 * This library is free software; you can redistribute it and/or 00010 * modify it under the terms of the GNU Lesser General Public 00011 * License as published by the Free Software Foundation; either 00012 * version 2.1 of the License, or (at your option) any later version. 00013 * 00014 * This library is distributed in the hope that it will be useful, 00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 * Lesser General Public License for more details. 00018 * 00019 * You should have received a copy of the GNU Lesser General Public 00020 * License along with this library; if not, write to the Free Software 00021 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00022 */ 00023 00024 #include <map> 00025 00026 namespace Tagcoll 00027 { 00028 00029 template <class T> 00030 class HandleMaker 00031 { 00032 std::map<int, T> handles_to_items; 00033 std::map<T, int> items_to_handles; 00034 int handle_seq; 00035 00036 public: 00037 HandleMaker() throw () : handle_seq(0) {} 00038 00039 int getHandle(T item) throw () 00040 { 00041 typename std::map<T, int>::iterator i = items_to_handles.find(item); 00042 if (i == items_to_handles.end()) 00043 { 00044 int res = handle_seq++; 00045 items_to_handles.insert(std::make_pair(item, res)); 00046 handles_to_items.insert(std::make_pair(res, item)); 00047 return res; 00048 } else 00049 return i->second; 00050 } 00051 00052 T getItem(int handle) const throw () 00053 { 00054 typename std::map<int, T>::const_iterator i = handles_to_items.find(handle); 00055 //assert(i != handles_to_items.end()); 00056 return i->second; 00057 } 00058 }; 00059 00060 }; 00061 00062 // vim:set ts=4 sw=4: 00063 #endif

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