Bug 176681 Issue about creating context-parameter path in read-only path[0601]
Description: Issue about creating context-parameter path in read-only path Build number:2.2.0.v20070308 Steps to reproduce: 1. Deploy birt. 2. Set BIRT_VIEWER_DOCUMENT_FOLDER/BIRT_VIEWER_IMAGE_DIR/.. to a read-only path. 3. Preview report. Expected result: Because the path is read-only, folders should be created in ${java.io.tmpdir} Actual result: No folders are created in ${java.io.tmpdir} and reports cannot be previewed in frameset mode.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
*/
	public static String getPageRange( HttpServletRequest request )
	{
		return getParameter( request, PARAM_PAGE_RANGE );
	}
	/**
	 * Get reportlet id from Http request.
	 * 
	 * @param request
	 *            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
	 */