officeManager.stop();
        } catch (final OfficeException e) {
            throw new CrawlerSystemException("Failed to stop officeManager.", e);
        }
    }

    public void addConversionRule(final String inExt, final String outExt) {
        extensionMap.put(inExt, outExt);
    }

    /*
     * (non-Javadoc)
     *