private function checkDeleteInput()
    {
        
        $defaults = array('language' => null,
        				  'input' => dirname(__FILE__) . '/../../' . $this->options['extension'] . '/' . self::DEF_INPUT_DIR,
        				  'output' => dirname(__FILE__) . '/../../' . $this->options['extension'] . '/' . self::DEF_OUTPUT_DIR,
                          'extension' => null);
        
        $this->options = array_merge($defaults, $this->options);
        
        if (is_null($this->options['extension'])){
        	$this->err("Please provide an 'extension' identifier.", true);
        }else{
            if (is_null($this->options['language'])) {
                $this->err("Please provide a 'language' identifier such as en-US, fr-CA, IT, ...", true);
            } else {
				$this->checkInputOption();
			}
        }
        
    }