<?php

/**
 * The abstract class of logger. 
 * User can define the log level for the different output details.
 * 
 * @package		com.freeorm
 * @author		Yide Zou
 * @link		http://www.freeorm.com
 * @copyright	Copyright (c) 2010 Yide Zou <hide@address.com>. 
 * 				All Rights Reserved.
 * @license		This software is released under the terms of the GNU Lesser General Public License
 * 				A copy of which is available from http://www.gnu.org/copyleft/lesser.html
 */


abstract class Logger 
{
	protected $level = LOG_LVL_NONE;
	
	public function __construct($level=LOG_LVL_NONE)
	{
		$this->level = $level;
	}
	
	/**
	 * get current level
	 */
	public function getLevel()
	{
		return $this->level;
	}
	
	/**
	 * set level
	 */
	public function setLevel($level)
	{
		$this->level = $level;
	}
	
	
	/**
	 * Log the normal message
	 * It will be output if the log level == LOG_LVL_ALL
	 */
	public function log($text)
	{
		if ($this->level == LOG_LVL_ALL)
			$this->output($text, 'SYSOUT');
	} 
	
	/**
	 * Log the debug message
	 * It will be output if the log level >= LOG_LVL_DEBUG
	 */
	public function debug($text)
	{
		if ($this->level >= LOG_LVL_DEBUG)
			$this->output($text, 'DEBUG');
	}
	
	
	/**
	 * Log the error message
	 * It will be output if the log level >= LOG_LVL_ERROR
	 */
	public function err($text)
	{
		if ($this->level >= LOG_LVL_ERROR)
			$this->output($text, 'ERROR');
	}
	
	/**
	 * The real output function, 
	 * it can direct output to screen or for example save into a file
	 * @param $text
	 * @param $type the type of message, it can for example 'log' or 'err'
	 */
	protected abstract function output($text, $type='ERROR');
}