ObjectsOptional.h

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#pragma once
 
#include <alib/optional>
#include <exception/CommonException.h>
#include <core/xmlApi.hpp>
 
namespace core {
 
template < typename T >
struct xmlApi < std::optional < T > > {
    static std::optional < T > parse ( ext::deque < sax::Token >::iterator & input );
    static bool first ( const ext::deque < sax::Token >::const_iterator & input );
    static std::string xmlTagName ( );
    static void compose ( ext::deque < sax::Token > & output, const std::optional < T > & input );
};
 
template < typename T >
std::optional < T > xmlApi < std::optional < T > >::parse ( ext::deque < sax::Token >::iterator & input ) {
    if ( sax::FromXMLParserHelper::isToken ( input, sax::Token::TokenType::START_ELEMENT, "void" ) ) {
        ++input;
        sax::FromXMLParserHelper::popToken ( input, sax::Token::TokenType::END_ELEMENT, "void" );
        return std::optional < T > ( );
    } else {
        return std::optional < T > ( core::xmlApi < T >::parse ( input ) );
    }
}
 
template < typename T >
bool xmlApi < std::optional < T > >::first ( const ext::deque < sax::Token >::const_iterator & input ) {
    return sax::FromXMLParserHelper::isToken ( input, sax::Token::TokenType::START_ELEMENT, "void" ) || xmlApi < T >::first ( input );
}
 
template < typename T >
std::string xmlApi < std::optional < T > >::xmlTagName ( ) {
    throw exception::CommonException ( "Optional does not have xmlTagName." );
}
 
template < typename T >
void xmlApi < std::optional < T > >::compose ( ext::deque < sax::Token > & output, const std::optional < T > & input ) {
    if ( ! input ) {
        output.emplace_back("void", sax::Token::TokenType::START_ELEMENT);
        output.emplace_back("void", sax::Token::TokenType::END_ELEMENT);
    } else {
        core::xmlApi < T >::compose ( output, input.value ( ) );
    }
}
 
} /* namespace core */