Bug 136770 Cannot view report document from web viewer
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
*/
	public static final String SUFFIX_REPORT_DOCUMENT = ".rptdocument"; 
	private static final String DOCUMENTS_DIR = "Documents";
	/**
	 * Report working folder.
	 */
	public static String workingFolder = null;
	/**
	 * Current web application locale.
	 */
	private static Locale webAppLocale = null;
	/**
	 * Flag indicating that if user can only access the file in working folder.
	 */
	private static boolean isWorkingFolderAccessOnly = true;
	/**
	 * Get bookmark. If page exists, ignore bookmark.
	 * 
	 * @param request
	 * @return
	 */
	public static String getBookmark( HttpServletRequest request )
	{
		int page = getParameterAsInt( request, PARAM_PAGE );
		return page < 1
				? getReportParameter( request, PARAM_BOOKMARK, null )
				: null;
	}
	/**
	 * Get query string with new parameter value.