uibuilder.h

#ifndef UIBUILD
#define UIBUILD

#include <itpp/itbase.h>
#include "stat/libBM.h"
#include "libconfig/libconfig.h++"

namespace bdm {

        using namespace libconfig;
        using namespace std;

#define CHECK_UITYPE(S,Type) it_assert_debug(S.getType()==Setting::Type, string("Wrong input path \"")+string(S.getPath())+string("\""));
#define UIREGISTER(UI) UI* UI##_global_instance = new UI();


        class UIbuilder;
        typedef map<const string, const UIbuilder*> UImap;
        extern UImap __uimap__;

        class UIFile : public Config {
        public:
                UIFile ( const char * fname ) :Config() {
                        try{Config::readFile ( fname );}
                        catch ( ParseException& P ) {
                                char msg[200];
                                sprintf ( msg,"Error in file %s  on line %d.", fname, P.getLine() );
                                it_error ( msg );
                        }
                        catch ( FileIOException f ) {it_error ( "File " + string ( fname ) + " not found" );}
                }
        };

        class UIbuilder {
        protected:
                const vec getvec ( Setting& S ) const {
                        CHECK_UITYPE ( S,TypeArray );
                        vec tmp;
                        tmp.set_size ( S.getLength() );
                        for ( int i=0;i<S.getLength();i++ ) {
                                switch ( S[i].getType() ) {
                                        case Setting::TypeFloat :
                                                tmp[i]=double ( S[i] );break;
                                        case Setting::TypeInt :
                                                tmp[i]=int ( S[i] );break;
                                        case Setting::TypeBoolean :
                                                tmp[i]=bool ( S[i] );break;
                                        default: it_error ( "libconfig error?" );
                                }
                        }
                        return tmp;
                };
                const vec getivec ( Setting& S ) const {
                        CHECK_UITYPE ( S,TypeArray );
                        vec tmp;
                        tmp.set_size ( S.getLength() );
                        for ( int i=0;i<S.getLength();i++ ) {
                                switch ( S[i].getType() ) {
                                        case Setting::TypeFloat :
                                                tmp[i]=double ( S[i] );break;
                                        case Setting::TypeInt :
                                                tmp[i]=int ( S[i] );break;
                                        case Setting::TypeBoolean :
                                                tmp[i]=bool ( S[i] );break;
                                        default: it_error ( "libconfig error?" );
                                }
                        }
                        return tmp;
                };
        public:
                UIbuilder ( const string &typ ) {__uimap__.insert ( make_pair ( typ,this ) );}
                virtual bdmroot* build ( Setting &S ) const =0;
        };

        class UIexternal:public UIbuilder {
        public:
                UIexternal() :UIbuilder ( "external" ) {}
                bdmroot* build ( Setting &S ) const;
        };

        class UIinternal:public UIbuilder {
        public:
                UIinternal() :UIbuilder ( "internal" ) {}
                bdmroot* build ( Setting &S ) const;
        };

        void UI_DBG ( Setting &S, const string &spc );

        template<class T>
        void UIbuild ( Setting &S, T* &ret ) {
                CHECK_UITYPE ( S,TypeGroup );
                // Check if field "type" is present, if not it is not a valid UI
                it_assert_debug ( S.exists ( "type" ), string ( S.getPath() ) +" is not a valid UI!" );

                const string typ=S["type"];
                // Find "type" in list of registred UI builders
                UImap::const_iterator iter = __uimap__.find ( typ );
                if ( iter == __uimap__.end() ) {
                        it_error ( "UI of type \"" + typ + "\" is not registered!" );
                }

                //BUILD the result
                try {
                        ret = dynamic_cast<T*> ( iter->second->build ( S ) );
                }
                catch ( SettingTypeException e ) {
                        UI_DBG(S,""); 
                        it_error ( "Setting " +string ( e.getPath() ) +" is of incorrect Type" );}
                catch ( SettingNotFoundException e ) {
                        UI_DBG(S,"");
                        it_error ( "Setting " + string ( e.getPath() ) +" was not found" );}
        };

        template<class T>
        void UIcall ( Setting &S, void ( *func ) ( Setting&, T ), T Tmp ) {
                CHECK_UITYPE ( S,TypeGroup );
                // Check if field "type" is present, if not it is not a valid UI
                it_assert_debug ( S.exists ( "type" ), string ( S.getPath() ) +" is not a valid UI!" );

                const string typ=S["type"];
                if ( typ=="internal" ) {
                        try {
                                Setting* Stmp = &S;
                                do {Stmp=& ( Stmp->getParent() );}
                                while ( !Stmp->isRoot() );
                                Setting& intS=Stmp->lookup ( ( const char* ) S["path"] );
                                func ( intS, Tmp ); // <======== calling func
                                return;
                        }
                        catch ( ... ) {
                                it_error ( "Internal field " + string ( S.getPath() ) + " not valid" );
                        }
                }
                if ( typ=="external" ) {
                        UIFile C(S["filename"]);
                        try {
                                func ( C.lookup ( ( const char* ) S["path"] ), Tmp );
                        }
                        catch ( ... ) {
                                it_error ( "External field " + string ( S.getPath() ) + " not valid" );
                        }
                        return;
                }

                // v======================= calling final func
                func ( S, Tmp );
        };

}
#endif //UIBUILD

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