PartialMap.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  *
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00027 
00034 #ifndef KEYVALUE_KEY_MAP_PARTIALMAP_H_
00035 #define KEYVALUE_KEY_MAP_PARTIALMAP_H_
00036 
00037 #include <boost/static_assert.hpp>
00038 #include <boost/type_traits/is_same.hpp>
00039 
00040 #include "keyvalue/extern/String.h"
00041 #include "keyvalue/extern/Ptime.h"
00042 #include "keyvalue/key/Key.h"
00043 
00044 namespace keyvalue {
00045 
00046 // Forward declaration
00047 
00048 namespace value {
00049 class Variant;
00050 }
00051 
00052 namespace key {
00053 
00080 template <typename OutputType>
00081 class PartialMap {
00082 
00083 public:
00084 
00085   typedef OutputType OutputType_;
00086 
00098   OutputType
00099   map(const value::Variant& variant) const;
00100 
00110   virtual OutputType
00111   get(const string& name) const = 0;
00112 
00113 private:
00114 
00120   virtual string
00121   getName() const = 0;
00122 
00123   typedef typename boost::is_same<OutputType, double>::type IsDouble_;
00124   typedef typename boost::is_same<OutputType, ptime>::type IsPtime_;
00125   typedef typename boost::is_same<OutputType, unsigned int>::type IsUInt_;
00126 
00127   /*
00128    ATTENTION: If you get a compiler error here about
00129 
00130    'boost::STATIC_ASSERTION_FAILURE<x>'
00131 
00132    this means that you are trying to instantiate PartialMap policy for an
00133    OutputType different of double, ptime and unsigned int.
00134    */
00135   BOOST_STATIC_ASSERT(IsDouble_::value || IsPtime_::value ||
00136     IsUInt_::value);
00137 
00138 }; // class PartialMap
00139 
00140 } // namespace key
00141 } // namespace keyvalue
00142 
00143 #endif // KEYVALUE_KEY_MAP_PARTIALMAP_H_