//
// Filter.cpp
//
// Copyright (C) :  2000 - 2002
//                    LifeLine Networks BV (www.lifeline.nl). All rights reserved.
//                    Bastiaan Bakker. All rights reserved.
//
//                    2004,2005,2006,2007,2008,2009,2010,2011,2012
//                    Synchrotron SOLEIL
//                    L'Orme des Merisiers
//                    Saint-Aubin - BP 48 - France
//
// This file is part of log4tango.
//
// Log4ango is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Log4tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Log4Tango.  If not, see <http://www.gnu.org/licenses/>.

#ifdef APPENDERS_HAVE_FILTERS

  #include <tango/common/log4tango/Portability.h>
  #include <tango/common/log4tango/Filter.h>

namespace log4tango
{

Filter::Filter() :
    _chain(0)
{
    // no-op
}

Filter::~Filter()
{
    if(_chain)
    {
        delete _chain;
        _chain = 0;
    }
}

void Filter::set_chained_filter(Filter *filter)
{
    if(filter != _chain)
    {
        if(_chain)
        {
            delete _chain;
        }
        _chain = filter;
    }
}

Filter *Filter::get_end_of_chain(void)
{
    Filter *end = this;
    while(end->get_chained_filter())
    {
        end = end->get_chained_filter();
    }
    return end;
}

void Filter::append_chained_filter(Filter *filter)
{
    Filter *end = get_end_of_chain();
    end->set_chained_filter(filter);
}

Filter::Decision Filter::decide(const LoggingEvent &event)
{
    Filter::Decision decision = _decide(event);
    if((Filter::NEUTRAL == decision) && get_chained_filter())
    {
        decision = get_chained_filter()->decide(event);
    }
    return decision;
}

} // namespace log4tango

#endif // APPENDERS_HAVE_FILTERS
