Bug 214204 Only document content in document folder should be removed.[0601]
Description: Only document related content in document folder should be removed. Build number:2.3.0.v20080103 Steps to reproduce: 1. Deploy BIRT. 2. Edit web.xml to set BIRT_VIEWER_DOCUMENT_FOLDER to your local path and there are content inside the path. 3. Start server and click View Example to preview sample report. Expected result: Only content created by viewer should be removed in specified document folder. Actual result: All contents are deleted despite whether they are related with BIRT. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
*            http request
	 * @return reportlet id
	 */
	public static String getReportletId( HttpServletRequest request )
	{
		if ( isIidReportlet( request ) )
			return getParameter( request, PARAM_INSTANCEID );
		if ( isBookmarkReportlet( request ) )
			return getParameter( request, PARAM_BOOKMARK );
		return null;
	}
	/**
	 * Get named parameters from http request. parameter names and values are
	 * all in iso-8859-1 format in request.
	 * 
	 * @param request
	 *            incoming http request
	 * @param parameterName
	 *            parameter name in UTF-8 format
	 * @return named parameters from http request
	 */
	public static Set getParameterValues( HttpServletRequest request,
			String parameterName )
	{
		return getParameterValues( request, parameterName, true );
	}
	/**
	 * Get report file name. If passed file path is null, get report file from
	 * request.
	 *