/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include <log4cxx/spi/loggingevent.h>
#include <log4cxx/varia/levelrangefilter.h>
#include <log4cxx/helpers/stringhelper.h>
#include <log4cxx/helpers/optionconverter.h>
#include <log4cxx/level.h>

using namespace log4cxx;
using namespace log4cxx::varia;
using namespace log4cxx::spi;
using namespace log4cxx::helpers;

IMPLEMENT_LOG4CXX_OBJECT(LevelRangeFilter)

String LevelRangeFilter::LEVEL_MIN_OPTION = _T("LevelMin");
String LevelRangeFilter::LEVEL_MAX_OPTION = _T("LevelMax");
String LevelRangeFilter::ACCEPT_ON_MATCH_OPTION = _T("AcceptOnMatch");

LevelRangeFilter::LevelRangeFilter()
: acceptOnMatch(true), levelMin(Level::ALL), levelMax(Level::OFF)
{
}

void LevelRangeFilter::setOption(const String& option,
	const String& value)
{
	if (StringHelper::equalsIgnoreCase(option, LEVEL_MIN_OPTION))
	{
		levelMin = OptionConverter::toLevel(value, levelMin);
	}
else if (StringHelper::equalsIgnoreCase(option, LEVEL_MAX_OPTION))
	{
		levelMax = OptionConverter::toLevel(value, levelMax);
	}
	else if (StringHelper::equalsIgnoreCase(option, ACCEPT_ON_MATCH_OPTION))
	{
		acceptOnMatch = OptionConverter::toBoolean(value, acceptOnMatch);
	}
}

Filter::FilterDecision LevelRangeFilter::decide(
	const spi::LoggingEventPtr& event) const
{
	if (levelMin != 0 && !event->getLevel()->isGreaterOrEqual(levelMin))
	{
		// level of event is less than minimum
		return Filter::DENY;
	}

	if (levelMax != 0 && event->getLevel()->toInt() > levelMax->toInt())
	{
		// level of event is greater than maximum
		// Alas, there is no Level.isGreater method. and using
		// a combo of isGreaterOrEqual && !Equal seems worse than
		// checking the int values of the level objects..
		return Filter::DENY;
	}

	if (acceptOnMatch)
	{
		// this filter set up to bypass later filters and always return
		// accept if level in range
		return Filter::ACCEPT;
	}
	else
	{
		// event is ok for this filter; allow later filters to have a look..
		return Filter::NEUTRAL;
	}
}