H:/Workspace/php-axiom/www/php-axiom/libraries/axiom/axLogger.class.php

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<?php
abstract class axLogger {
    
    const ERR = 1;
    const NOTICE = 2;
    const WARNING = 4;
    const DEBUG = 8;
    
    protected $_mask;
    
    protected $_next;
    
    public function __construct ($mask = false) {
        if (!$mask)
            $mask = 15;
        $this->_mask = $mask;
    }
    
    public function setNext (axLogger $logger) {
        return $this->_next = $logger;
    }
    
    public function message ($msg, $priority = self::NOTICE) {
        switch ($priority) {
            default:
            case self::ERR:     $severity = "Error";   break;
            case self::NOTICE:  $severity = "Notice";  break;
            case self::WARNING: $severity = "Warning"; break;
            case self::DEBUG:   $severity = "Debug";   break;
        }
        
        if ($priority & $this->_mask)
            $this->writeMessage($msg, $severity);
            
        if (isset($this->_next))
            $this->_next->message($msg, $priority);
            
        return $this;
    }
    
    abstract public function writeMessage ($msg, $severity);
}