unwrapargs.hxx

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#ifndef INCLUDED_COMPHELPER_UNWRAPARGS_HXX
#define INCLUDED_COMPHELPER_UNWRAPARGS_HXX
 
#include <sal/config.h>
 
#include <optional>
 
#include <com/sun/star/uno/Sequence.hxx>
#include <com/sun/star/uno/XInterface.hpp>
#include <com/sun/star/lang/IllegalArgumentException.hpp>
#include <cppu/unotype.hxx>
 
namespace comphelper {
 
namespace detail {
    inline void unwrapArgsError(
        const OUString& str, sal_Int32 nArg,
        const css::uno::Reference< css::uno::XInterface >& xErrorContext =
          css::uno::Reference< css::uno::XInterface >() )
    {
        throw css::lang::IllegalArgumentException(
            str, xErrorContext, static_cast< sal_Int16 >( nArg ) );
    }
 
    template< typename T, typename... Args >
    inline void unwrapArgsError( const OUString& str, sal_Int32 nArg, T&, Args&... args )
    {
        return unwrapArgsError( str, nArg, args... );
    }
 
    inline void unwrapArgs(
        const css::uno::Sequence< css::uno::Any >&,
        sal_Int32,
        const css::uno::Reference< css::uno::XInterface >& )
    {
        return;
    }
 
    inline void unwrapArgs(
        const css::uno::Sequence< css::uno::Any >&,
        sal_Int32 )
    {
        return;
    }
 
    template< typename T, typename... Args >
    inline void unwrapArgs(
        const css::uno::Sequence< css::uno::Any >& seq,
        sal_Int32 nArg, ::std::optional< T >& v, Args&... args );
 
    template< typename T, typename... Args >
    inline void unwrapArgs(
        const css::uno::Sequence< css::uno::Any >& seq,
        sal_Int32 nArg, T& v, Args&... args )
    {
        if( seq.getLength() <= nArg )
        {
            return unwrapArgsError( OUString( "No such argument available!"),
                                     nArg, args... );
        }
        if( !fromAny( seq[nArg], &v ) )
        {
            OUString msg =
                "Cannot extract ANY { " +
                seq[nArg].getValueType().getTypeName() +
                " } to " +
                ::cppu::UnoType<T>::get().getTypeName() +
                "!";
            return unwrapArgsError( msg, nArg, args... );
        }
        return unwrapArgs( seq, ++nArg, args... );
    }
 
    template< typename T, typename... Args >
    inline void unwrapArgs(
        const css::uno::Sequence< css::uno::Any >& seq,
        sal_Int32 nArg, ::std::optional< T >& v, Args&... args )
    {
        if( nArg < seq.getLength() )
        {
            T t;
            unwrapArgs( seq, nArg, t, args... );
            v = t;
        } else {
            unwrapArgs( seq, ++nArg, args... );
        }
    }
}
 
template< typename... Args >
inline void unwrapArgs(
    const css::uno::Sequence< css::uno::Any >& seq,
    Args&... args )
{
    return detail::unwrapArgs( seq, 0, args... );
}
 
} // namespace comphelper
 
#endif //  ! defined( INCLUDED_COMPHELPER_UNWRAPARGS_HXX)
 
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