root/bdm/user_info.h @ 357

#ifndef USER_INFO_H
#define USER_INFO_H

#include <stdio.h>
#include <string>
#include <typeinfo>
#include <map>

#include "libconfig/libconfig.h++"
#include "bdmroot.h"
#include "itpp/itbase.h"


using std::string;
using namespace std;
using namespace libconfig;

#define UIREGISTER(class_name) template<> Particular_UI<class_name>& Particular_UI<class_name>::ui = Particular_UI<class_name>(#class_name)

#define ASSERT_UITYPE(S,Type) it_assert_debug(S.getType()==Setting::Type, string("Wrong setting type, see input path \"")+string(S.getPath())+string("\""))

namespace bdm
{
class UI_File : public Config
{
private:
        const string file_name;

public:
        //! create empty object prepared to store Settings
        UI_File();

        //! creates object and fills it from a file
        UI_File( const string &file_name );

        //! save UserInfo to the file 
        void save(const string &file_name);

        operator Setting&();
};

/*!
@brief This class serves to load and/or save DOMElements into/from files
stored on a hard-disk.

Firstly, you associate new RootElement instance with some filename during a time of its 
construtcion. Then, you save some object into the new RootElement instance,
and save it into the file this way:
\code
        CAudi audi;
        RootElement root("cars.xml");
        UserInfo::save( audi, root, "TT");
        root.save();
\endcode

In the other way round, when loading object from a XML file, the appropriate code looks like this:
\code
        RootElement root("cars.xml");
        root.load();
        UserInfo::build<T>(root,"TT");
\endcode
*/


/*!
@brief UserInfo is an abstract is for internal purposes only. Use CompoundUserInfo<T> or Particular_UI<T> instead.
The raison d'etre of this class is to allow pointers to its templated descendants. 

Also, the main functions of the whole UserInfo library are included within this class, see
static methods 'build' and 'save'.


/*!\brief Builds computational object from a UserInfo structure

Return value is a pointer to the created object (memory management issue?)
/

*/
class UI 
{
private:
        //! static class encalupsating map of names to related UserInfos
        //! 
        //! The key property of this class is that it initilaized the internal map immediately
        //! when it is used for a first time.
        class Mapped_UI
        {
        private:
                //! Type definition of mapping which transforms type names to the related user infors
                typedef map< const string, const UI* const > String_To_UI_Map;

                //! Type definition of mapping which transforms type names to the related user infors
                typedef map< const type_info * const, const string > Type_Info_To_String_Map;

                //! immediately initialized instance of type String_To_UI_Map
                static String_To_UI_Map& mapped_strings();

                //! immediately initialized instance of type String_To_UI_Map
                static Type_Info_To_String_Map& mapped_type_infos();

        public:
                //! add a pair key-userinfo into the internal map
                static void add_class( const string &class_name, const type_info * const class_type_info, const UI* const ui );

                //! search for an userinfo related to the passed key within the internal map
                static const UI& retrieve_ui( const string &class_name );

                //! search for an userinfo related to the passed key within the internal map
                static const string& retrieve_class_name( const type_info* const class_type_info );
        };

        // vraci true, kdyz to byl platny link, jinak false.. v pripade chyby konci it_errorem..
        // do elementu vrati setting prislusny po rozbaleni linku, jinak ponecha beze zmeny
        class Link_Expander     
        {
        private:
                UI_File *file;
                const Setting *result;

        public:

                Link_Expander( const Setting &potential_link );
                
                ~Link_Expander();
                
                const Setting& root() const;
        };


        //! internal method assembling a typeless instance from components obtained by the 'AssemblyComponentsFromSetting()' method
        virtual bdmroot* new_instance() const = 0;
        
        //! This methods tries to save an instance of type T (or some of its descendant types)
        //! and build DOM tree accordingly. Then, it creates a new DOMNode named according class_name
        //! and connecti it to the passed Setting as a new child node.
        static const Setting& to_child_setting( const Setting &element, const int index );

        static const Setting& to_child_setting( const Setting &element, const string &name );


        //! This methods tries to build a new double matrix 
        static void from_setting( mat& matrix, const Setting &element );        
        //! This methods tries to build a new integer vector
        static void from_setting( ivec &vector, const Setting &element );
        // jednak kvuli pretypovani, apak taky proto, ze na string nefunguje link_expander..
        static void from_setting( string &str, const Setting &element );
        //! This methods tries to build a new templated array 

        static void from_setting( vec &vector, const Setting &element );

        template<class T> static void from_setting( T* &instance, const Setting &element )
        {                       
                const Link_Expander link_expander( element );
                const Setting &root = link_expander.root();

                ASSERT_UITYPE(root,TypeGroup);

                // we get a velue stored in the "class" attribute 
                string class_name;
                if( !root.lookupValue( "class", class_name ) )
                        ui_error( "the obligatory ""class"" identifier is missing", root );
        
                // and finally we find a UserInfo related to this type
                const UI& related_UI = Mapped_UI::retrieve_ui( class_name );
                
                bdmroot* typeless_instance = related_UI.new_instance();

                instance = NULL;
                try
                {
                        instance = (T*) typeless_instance ;
                }
                catch(...)
                {
                        it_error ( "UI error: class " + class_name + " is not a descendant of the desired output class. Try to call the UI::build function with a different type parameter." );
                }
                
                try
                {
                        instance->from_setting( root );
                }
                catch(SettingException xcptn)
                {
                        it_error ( "UI error: the method " + class_name + ".from_setting(Setting&) has thrown an exception when parsing the setting " + xcptn.getPath() + ". Try to correct this method." );
                }
        }       


        //! This methods tries to build a new templated array , 
        // efektivne jen pro vect, mat a string, pro dalsi je nutne pridat from_setting metodu.. ale to asi necceme
        template<class T> static void from_setting( Array<T> &array_to_load, const Setting &element )
        {
                const Link_Expander link_expander( element );
                const Setting &root = link_expander.root();

                ASSERT_UITYPE(root,TypeList);

                int len = root.getLength();
                array_to_load.set_length( len );
                if( len == 0 ) return;
                
                for( int i=0; i < len; i++ ) 
                        from_setting( array_to_load(i), root[i] ); 
        }

        static void ui_error( string message, const Setting &element );

protected:
        //! default constructor 
        UI( const string& class_name, const type_info * const class_type_info ) 
        {       
                Mapped_UI::add_class( class_name, class_type_info, this );
        }

        //! Virtual destructor for future use;
        virtual ~UI(){};

public: 
        //! This methods tries to build a new instance of type T (or some of its descendant types)
        //! according to a data stored in a DOMNode named class_name within a child nodes of the passed element.
        //! If an error occurs, it returns a NULL pointer.

        //! Prototype of a UI builder. Return value is by the second argument since it type checking via \c dynamic_cast.
        template<class T> static T* build( const Setting &element, const int index )
        {
                T* instance;
                from_setting<T>( to_child_setting( element, index ) );
                return instance;
        }

        template<class T> static T* build( const Setting &element, const string &name )
        {                       
                T* instance;
                from_setting<T>( instance, to_child_setting( element, name ) );
                return instance;
        }

        //! This methods tries to build a new double matrix 
        template<class T> static void get( T &instance, const Setting &element, const string &name )
        {
                from_setting( instance, to_child_setting( element, name ) );
        }

        //! This methods tries to build a new double matrix 
        template<class T> static void get( T &instance, const Setting &element, const int index )
        {
                from_setting( instance, to_child_setting( element, index ) );
        }

        //! This methods tries to build a new double matrix 
        template<class T> static void get( Array<T> &array_to_load, const Setting &element, const string &name )
        {
                from_setting( array_to_load, to_child_setting( element, name ) );
        }

        //! This methods tries to build a new double matrix 
        template<class T> static void get( Array<T> &array_to_load, const Setting &element, const int index )
        {
                from_setting( array_to_load, to_child_setting( element, index ) );
        }

        template< class T> static void save( const T * const instance, Setting &element, const string &name = "")
        {
                Setting &root = (name == "") ? element.add( Setting::TypeGroup )                                                        
                                                                         : element.add( name, Setting::TypeGroup );             

                const string &class_name = Mapped_UI::retrieve_class_name( &typeid(*instance) );
                        
                // add attribute "class" 
                Setting &type = root.add( "class", Setting::TypeString );
                type = class_name;

                try
                {
                        instance->to_setting( root );
                }
                catch(SettingException xcptn)
                {
                        it_error ( "UI error: the method " + class_name + ".to_setting(Setting&) has thrown an exception when filling the setting " + xcptn.getPath() + ". Try to correct this method." );
                }       
        }

        //! This methods tries to save a double vec 
        template<class T> static void save( const Array<T> &array_to_save, Setting &element, const string &name = "" )
        {
                ASSERT_UITYPE(element,TypeGroup);
                Setting &list = (name == "") ? element.add( Setting::TypeList )                                                 
                                                                         : element.add( name, Setting::TypeList );              
                for( int i=0; i<array_to_save.length(); i++ ) 
                        save( array_to_save(i), list );
        }


        //! This methods tries to save a double matrix 
        static void save( const mat &matrix, Setting &element, const string &name = "" );

        //! This methods tries to save a double vec 
        static void save( const ivec &vec, Setting &element, const string &name = "" );
        
        static void save( const vec &vector, Setting &element, const string &name);

        private: 
        //! This methods tries to save a double vec 
        static void save( const string &str, Setting &element); 

};


/*!
@brief The main userinfo template class. You should derive this class whenever you need 
a new userinfo of a class which is compound from smaller elements (all having its
own userinfo class prepared).
*/
template<typename T> class Particular_UI : private UI
{
        // to permit acces to the Particular_UI<T>::ui to the UI class
        friend UI;

        //! default constructor, which is intentionally declared as private
        Particular_UI<T>( const string &class_name) : UI( class_name, &typeid(T) ) 
        {       
        };

        //! the only instance of this class (each type T has its own instance)
        //! which is used as a factory for processing related UI
        static Particular_UI<T>& ui;    

        bdmroot* new_instance() const
        {
                return new T();
        }
};




}

/*! Recursive build of objects defined in the same file

\code 
{type="internal";
path="system.profile.[0]";    // Path from the root 
};
\endcode
 */



/*! Recursive build of objects defined in external file

\code 
{type="external";
filename="my_file.cfg";       // name of file from which to read
path="system.profile.[0]";    // Path in the external file
};
\endcode
/

*/

#endif // #ifndef USER_INFO_H