Bug 136820 viewer supports render report in pdf format
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
}
	/**
	 * Get engine instance.
	 * 
	 * @return
	 */
	public static ReportEngineService getInstance( )
	{
		return instance;
	}
	/**
	 * Get engine instance.
	 * 
	 * @return engine instance
	 */
	public static void initEngineInstance( ServletConfig servletConfig )
			throws BirtException
	{
		if ( ReportEngineService.instance != null )
		{
			return;
		}
		ReportEngineService.instance = new ReportEngineService( servletConfig );
	}
	/**
	 * Get all the files under the specified folder (including all the files
	 * under sub-folders)
	 * 
	 * @param dir -
	 *            the folder to look into