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E:/Projetos_Primeiro_Semestre_2012/TerraView/terralib/src/terralib/kernel/TeFactory.h
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    00001 /************************************************************************************
    00002 TerraLib - a library for developing GIS applications.
    00003 Copyright © 2001-2007 INPE and Tecgraf/PUC-Rio.
    00004
    00005 This code is part of the TerraLib library.
    00006 This library is free software; you can redistribute it and/or
    00007 modify it under the terms of the GNU Lesser General Public
    00008 License as published by the Free Software Foundation; either
    00009 version 2.1 of the License, or (at your option) any later version.
    00010
    00011 You should have received a copy of the GNU Lesser General Public
    00012 License along with this library.
    00013
    00014 The authors reassure the license terms regarding the warranties.
    00015 They specifically disclaim any warranties, including, but not limited to,
    00016 the implied warranties of merchantability and fitness for a particular purpose.
    00017 The library provided hereunder is on an "as is" basis, and the authors have no
    00018 obligation to provide maintenance, support, updates, enhancements, or modifications.
    00019 In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
    00020 indirect, special, incidental, or consequential damages arising out of the use
    00021 of this library and its documentation.
    00022 *************************************************************************************/
    00026 #ifndef  __TERRALIB_INTERNAL_FACTORY_H
    00027 #define  __TERRALIB_INTERNAL_FACTORY_H
    00028
    00029 #include <map>
    00030 #include <string>
    00031
    00032 using namespace std;
    00033
    00035 /*
    00036   The "factory" pattern is a technique for creating new
    00037   instances of objects which defines an abstract interface,
    00038   (represented by the "Make" module). The subclasses of
    00039   factory decide which class to instantiate.
    00040
    00041
    00042   Each subclass of factory "registers" itself at compile time;
    00043   therefore, the addition of a new factory requires no change
    00044   the parent class.
    00045
    00046   \author Gilberto Camara
    00047 */
    00048 template <class T, class Arg>
    00049 class TeFactory
    00050 {
    00051 public:
    00052
    00054            typedef map<string, TeFactory<T,Arg>* > TeFactoryMap;
    00055
    00057            static TeFactoryMap& instance ()
    00058            {
    00059                       static TeFactoryMap Fmap_;
    00060                       return Fmap_;
    00061
    00062            }
    00063
    00065            TeFactory (const string& factoryName);
    00066
    00067            virtual ~TeFactory() {}
    00068
    00070            static T* make  ( string name, const Arg& arg );
    00071
    00073            static T* make  ( const Arg& arg  );
    00074
    00075
    00076 protected:
    00077
    00079     virtual T* build ( const Arg& arg ) = 0;
    00080
    00081 private:
    00082            string  Fname_;
    00083 };
    00084
    00085 // Initialisation of static variable
    00086 //template <class T, class Arg>
    00087 //TeFactory<T,Arg>::TeFactoryMap TeFactory<T,Arg>::Fmap_;
    00088
    00089
    00090 // Constructor
    00091 template <class T, class Arg>
    00092 TeFactory<T,Arg>::TeFactory(const string& name):
    00093            Fname_(name)
    00094 {
    00095            TeFactory<T,Arg>::instance()[name] = this;
    00096
    00097 }
    00098
    00099 // Destructor
    00100 //template <class T, class Arg>
    00101 //TeFactory<T,Arg>::~TeFactory<T,Arg> ()
    00102 //{
    00103            // Remove the object from the factory dictionary
    00104            // Fmap_.erase ( Fname_ );
    00105 //}
    00106
    00108 template <class T, class Arg>
    00109 T*
    00110 TeFactory<T,Arg>::make ( string name, const Arg& arg )
    00111 {
    00112            // try to find the name on the factory dictionary
    00113            typename TeFactoryMap::iterator i = TeFactory<T,Arg>::instance().find ( name );
    00114
    00115            // Not found ?  return the Default Object
    00116            if ( i == TeFactory<T,Arg>::instance().end() )
    00117                       return T::DefaultObject( arg );
    00118
    00119            // Create an object, based on the input parameters
    00120            return (*i).second->build ( arg );
    00121            return 0;
    00122
    00123 }
    00124
    00126 template <class T, class Arg>
    00127 T*
    00128 TeFactory<T,Arg>::make (const Arg& arg )
    00129 {
    00130            string name = arg.decName();
    00131
    00132            // try to find the name on the factory dictionary
    00133            typename TeFactoryMap::iterator i = TeFactory<T,Arg>::instance().find ( name );
    00134
    00135            // Not found ?  return the Default Object
    00136            if ( i == TeFactory<T,Arg>::instance().end() )
    00137                       return T::DefaultObject( arg );
    00138
    00139            // Create an object, based on the input parameters
    00140            return (*i).second->build ( arg );
    00141            return 0;
    00142
    00143 }
    00144 #endif
    00145

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