partshell.h

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/*******************************************************************************
 * wallaroo - A library for configurable creation and wiring of C++ classes.
 * Copyright (C) 2012 Daniele Pallastrelli
 *
 * This file is part of wallaroo.
 * For more information, see http://wallaroolib.sourceforge.net/
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
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 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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#ifndef WALLAROO_DETAIL_PARTSHELL_H_
#define WALLAROO_DETAIL_PARTSHELL_H_

#include <string>
#include <typeinfo>
#include <cassert>
#include "wallaroo/cxx0x.h"
#include "wallaroo/part.h"

namespace wallaroo
{
namespace detail
{


// This class provides the conversion operator to the contained type.
// In particular, the Catalog::operator[] returns a PartShell
// that can be converted to the inner type.
class PartShell
{
public:

    PartShell( const cxx0x::shared_ptr< Part >& dev ) : part( dev ) 
    {
        assert( part );
    }

    // @throw ElementNotFound If @c collaboratorName does not exist in this part.
    // @throw WrongType If @c destination has not a type compatible with the dependency.
    void Wire( const std::string& collaboratorName, const PartShell& destination ) const
    {
        part -> Wire( collaboratorName, destination.part );
    }

    template < class T >
    void SetAttribute( const std::string& attribute, const T& value ) const
    {
        part -> SetAttribute( attribute, value );
    }

    template < class T >
    operator cxx0x::shared_ptr< T >()
    {
        cxx0x::shared_ptr< T > result = cxx0x::dynamic_pointer_cast< T >( part );
        if ( ! result ) throw WrongType();
        return result;
    }

private:
    cxx0x::shared_ptr< Part > part;
};

} // namespace detail
} // namespace wallaroo

#endif