FlagMap.h

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00001 /***************************************************************************
00002  *
00003  * Copyright (C) 2009-2010 Cassio Neri Moreira
00004  *
00005  * This file is part of the KeyValue library.
00006  *
00007  * The KeyValue library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License as published
00009  * by the Free Software Foundation, either version 3 of the License, or (at
00010  * your option) any later version.
00011  *
00012  * The KeyValue library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
00015  * Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License along
00018  * with KeyValue. If not, see <http://www.gnu.org/licenses/>.
00019  *
00020  **************************************************************************/
00021 
00029 #ifndef KEYVALUE_KEY_MAP_FLAGMAP_H_
00030 #define KEYVALUE_KEY_MAP_FLAGMAP_H_
00031 
00032 #include "keyvalue/extern/String.h"
00033 #include "keyvalue/key/Key.h"
00034 #include "keyvalue/sys/exception/Exception.h"
00035 #include "keyvalue/value/Variant.h"
00036 
00037 namespace keyvalue {
00038 namespace key {
00039 
00063 template <typename OutputType>
00064 class FlagMap {
00065 
00066 public:
00067 
00068   typedef OutputType OutputType_;
00069 
00070   FlagMap();
00071 
00083   OutputType
00084   map(const value::Variant& variant) const;
00085 
00095   virtual OutputType
00096   get(const string& name) const = 0;
00097 
00098 private:
00099 
00105   virtual string
00106   getName() const = 0;
00107 
00108 }; // class FlagMap
00109 
00110 /*--------------------------------------------------------------------------
00111  * FlagMap()
00112  *------------------------------------------------------------------------*/
00113 
00114 template<typename OutputType>
00115 FlagMap<OutputType>::FlagMap() {
00116 }
00117 
00118 /*--------------------------------------------------------------------------
00119  * map()
00120  *------------------------------------------------------------------------*/
00121 
00122 template<typename OutputType>
00123 OutputType
00124 FlagMap<OutputType>::map(const value::Variant& variant) const {
00125 
00126   if (variant.is<string>(frontend::LexicalToolKit::input)) {
00127 
00128     try {
00129       return get(variant.get<string>(frontend::LexicalToolKit::input));
00130     }
00131 
00132     catch (frontend::LexicalToolKit::Failure&) {
00133     }
00134   }
00135 
00136   throw RuntimeError() & "Invalid value '" & variant & "' for key '" &
00137     getName() & "'!";
00138 }
00139 
00140 } // namespace key
00141 } // namespace keyvalue
00142 
00143 #endif // KEYVALUE_KEY_MAP_FLAGMAP_H_