// $Id$
//
// Copyright (C) 2008
// Fraunhofer Institute for Open Communication Systems (FOKUS)
// Competence Center NETwork research (NET), St. Augustin, GERMANY
//     Stefan Bund <g0dil@berlios.de>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the
// Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

/** \file
    \brief Config internal header */

#ifndef IH_SENF_Scheduler_Console_Config_
#define IH_SENF_Scheduler_Console_Config_ 1

// Custom includes
#include <boost/utility.hpp>
#include <boost/intrusive_ptr.hpp>
#include "Executor.hh"
#include <senf/Utils/intrusive_refcount.hh>
#include <senf/Utils/DiscardStream.hh>

//-/////////////////////////////////////////////////////////////////////////////////////////////////

namespace senf {
namespace console {
namespace detail {

    /** \brief Internal: Executor wrapper implementing restricted execution

        A RestrictedExecutor will only process commands which a re children of a given node. It does
        \e not follow any links.
     */
    class RestrictedExecutor
        : boost::noncopyable
    {
    public:
        typedef void result_type;

        //-/////////////////////////////////////////////////////////////////////////////////////////
        //\/name Structors and default members
        //\{

        RestrictedExecutor(DirectoryNode & root = senf::console::root());

        //\}
        //-/////////////////////////////////////////////////////////////////////////////////////////

        void execute(std::ostream & output, ParseCommandInfo const & command);
                                        ///< Execute command
                                        /**< Output will be written to \a output.
                                             Same as operator()(). */

        void operator()(std::ostream & output, ParseCommandInfo const & command);
                                        ///< Execute command
                                        /**< Output will be written to \a output.
                                             Same as execute(). */

        GenericNode & getNode(ParseCommandInfo const & command);

        bool complete() const;          ///< \c true, if all nodes have been parsed
        bool parsed(GenericNode & node) const; ///< \c true. if \a node has been parsed
        void reset();                   ///< Reset node parse info state
                                        /**< After a call to reset(), all information about already
                                             parsed nodes is cleared. Calling parse() will parse the
                                             complete config file again. */

        DirectoryNode & root() const;
        void chroot(DirectoryNode & node);

        std::ostream & stream();

        class RestrictGuard;

    protected:

    private:
        void policyCallback(DirectoryNode & dir, std::string const & item);
        void insertParsedNode(DirectoryNode & node);

        typedef std::vector<DirectoryNode::weak_ptr> ParsedNodes;

        Executor executor_;
        ParsedNodes parsedNodes_;
        DirectoryNode::ptr restrict_;
        DiscardStream stream_;

        friend class RestrictGuard;
    };

    /** \brief Internal: Set restricted node of a RestrictedExecutor

        A RestrictGuard will set the node to which to restrict. It will automatically reset the node
        in it's destructor.
     */
    class RestrictedExecutor::RestrictGuard
    {
    public:
        //-/////////////////////////////////////////////////////////////////////////////////////////
        //\/name Structors and default members
        //\{

        explicit RestrictGuard(RestrictedExecutor & executor);
        RestrictGuard(RestrictedExecutor & executor, DirectoryNode & restrict);
        ~RestrictGuard();

        //\}
        //-/////////////////////////////////////////////////////////////////////////////////////////

    protected:

    private:
        RestrictedExecutor & executor_;

    };

    /** \brief Internal: ConfigSource base class

        All configuration sources derive from ConfigSource. A ConigSource somehow reads
        configuration commands and passes them to a RestrictedExecutor.
      */
    class ConfigSource
        : public senf::intrusive_refcount
    {
    public:
        typedef boost::intrusive_ptr<ConfigSource> ptr;
        virtual ~ConfigSource();

        void parse(RestrictedExecutor & executor);

    protected:

    private:
        virtual void v_parse(RestrictedExecutor & executor) = 0;
    };

}}}

//-/////////////////////////////////////////////////////////////////////////////////////////////////
#endif


// Local Variables:
// mode: c++
// fill-column: 100
// comment-column: 40
// c-file-style: "senf"
// indent-tabs-mode: nil
// ispell-local-dictionary: "american"
// compile-command: "scons -u test"
// End: