95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//characters [1] verbatim: [\verb@] [@]
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//paragraph [1] title: [{\Large \bf ] [}]
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[1] ListStream.cpp
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1 Defines and includes
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*/
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#include <stdexcept>
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#include "QueryProcessor.h"
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#include "ListStream.hpp"
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/*
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2. helper functions to avoid redundancy when dealing
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with secondo ListExpr: Extract elementary types int, double,
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bool, string from a ListExpr
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*/
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template<> int from_atom<int>( ListExpr instance )
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{
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if ( ! nl->IsAtom( instance ) || nl->AtomType( instance ) != IntType )
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throw std::runtime_error( "Atom with type INT expected!" );
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return nl->IntValue( instance );
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}
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template<> uint8_t from_atom<uint8_t>( ListExpr instance )
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{
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return uint8_t( from_atom<int>( instance ) );
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}
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template<> double from_atom<double>( ListExpr instance )
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{
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if ( ! nl->IsAtom( instance ) || nl->AtomType( instance ) != RealType )
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throw std::runtime_error( "Atom with type REAL expected!" );
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return nl->RealValue( instance );
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}
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template<> bool from_atom<bool>( ListExpr instance )
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{
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if ( ! nl->IsAtom( instance ) || nl->AtomType( instance ) != BoolType )
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throw std::runtime_error( "Atom with type BOOL expected!" );
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return nl->BoolValue( instance );
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}
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template<> std::string from_atom<std::string>( ListExpr instance )
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{
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if ( nl->IsAtom( instance ) )
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{
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NodeType type = nl->AtomType( instance );
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if ( StringType == type )
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return nl->StringValue( instance );
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else if ( SymbolType == type )
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return nl->SymbolValue( instance );
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else if ( TextType == type )
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{
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std::string tmp;
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TextScan ts = nl->CreateTextScan( instance );
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nl->GetText( ts, nl->TextLength( instance ), tmp );
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nl->DestroyTextScan( ts );
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return tmp;
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}
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}
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throw std::runtime_error( "Atom convertable to string expected!" );
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}
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