java()
local Logger = require "java:org.apache.log4j.Logger"
local EnhancedPatternLayout = require "java:org.apache.log4j.EnhancedPatternLayout"
local ConsoleAppender = require "java:org.apache.log4j.ConsoleAppender"
local Level = require "java:org.apache.log4j.Level"
local RollingFileAppender = require "java:org.apache.log4j.RollingFileAppender"


layout = "%d %-5p %c - %m%n"

level = "INFO"

console = "System.err"  -- or "System.out" or set to nil for no console

file = nil  -- set to file name if you want logging to a file

max_file_size = nil  -- by default is "10MB"


log4j_root_logger = Logger.getRootLogger()

local function to_level(level)
	return level and Level.toLevel(level)
end

function log_to_file(file,logger_name)  -- logger_name is optional, defaults to root logger
	local appender = RollingFileAppender.new(ptn_layout, file)
	appender.setMaxFileSize(max_file_size)
	local logger = logger_name and Logger.getLogger(logger_name) or log4j_root_logger
	logger.addAppender(appender)
	return appender
end

function init()
	log4j_root_logger.removeAllAppenders()
	log4j_root_logger.setLevel( to_level(level) )
	ptn_layout = EnhancedPatternLayout.new(layout)

	if console ~= nil then
		console_appender = ConsoleAppender.new(ptn_layout,console)
		log4j_root_logger.addAppender(console_appender)
	else
		console_appender = nil
	end

	if file ~= nil then
		file_appender = log_to_file(file)
	else
		file_appender = nil
	end
end

init()


local function to_luan_logger(log4j_logger)
	local tbl = {}

	tbl.error = log4j_logger.error
	tbl.warn = log4j_logger.warn
	tbl.info = log4j_logger.info
	tbl.debug = log4j_logger.debug

	function tbl.get_level()
		local level = log4j_logger.getLevel()
		return level and level.toString()
	end

	function tbl.get_effective_level()
		local level = log4j_logger.getEffectiveLevel()
		return level and level.toString()
	end

	function tbl.set_level(level)
		log4j_logger.setLevel( to_level(level) )
	end

	return tbl
end

function logger(name)
	return to_luan_logger( Logger.getLogger(name) )
end

function root_logger()
	return to_luan_logger( Logger.getRootLogger() )
end