<?php

interface IException
{
    /* Protected methods inherited from Exception class */
    public function getMessage();                 // Exception message
    public function getCode();                    // User-defined Exception code
    public function getFile();                    // Source filename
    public function getLine();                    // Source line
    public function getTrace();                   // An array of the backtrace()
    public function getTraceAsString();           // Formated string of trace

    /* Overrideable methods inherited from Exception class */
    public function __toString();                 // formated string for display
    public function __construct($message = null, $code = 0);
}

abstract class CustomException extends Exception implements IException
{
    private   $trace;                             // Unknown
    private   $string;                            // Unknown
    protected $message = 'Unknown exception';     // Exception message
    protected $code = 0;                       	   // User-defined exception code
    protected $file;                              // Source filename of exception
    protected $line;                              // Source line of exception


    public function __construct($message = null, $code = 0)
    {
        if (!$message) {
            throw new $this('Unknown '. get_class($this));
        }
        parent::__construct("Err: ".$message."\n", $code);
    }

    public function __toString() {
    	$err=$this->message;
    	if($this->code!=0)
    		$err= get_class($this). 
    				" '{$this->message}' in {$this->file}({$this->line})\n".
    				"{$this->getTraceAsString()}";
    	
    	return $err;
    }
}

class DbErrException extends CustomException{};

class DbResException extends DbErrException{};

class UsageException extends CustomException{
    public function __construct($message = null, $code = 0)
    {
        if (!$message and $code == 0) {
            throw new $this('Unknown '. get_class($this));
        } elseif ($message != null and $code > 0) {
            $argv="Err: ".$message."\n";
            $message="Bad arg: ".$argv." is not a valid command, with ".$code." arguments\n";
            $code=0;
        }

        parent::__construct($message, $code);
    }

    public function __toString() {
        return $this->message;
    }

}

class OtConfException  extends CustomException{};

class FileException  extends CustomException{
	public function __toString() {
		return $this->message;
	}
};

?>