Bug 137176 It takes unacceptable long time to render a report
Description: Get the attached report design, preview in report designer. It takes unacceptable long time to render a report, and users could not get the output finally. Even during the rending, the computer could not do anything else.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
String filePath = getParameter( request, PARAM_REPORT_DOCUMENT );
		filePath = preProcess( filePath );
		if ( "".equals( filePath ) ) 
		{
			filePath = generateDocumentFromReport( request );
			filePath = createDocumentPath( filePath, request );
		}
		else
		{
			filePath = createAbsolutePath( filePath );
		}
		return filePath;
	}
	/**
	 * Create the file path of the the document. The document will be put under
	 * the working folder birt document directory based on different session id.
	 * 
	 * @param filePath
	 *            the document path cretaed from the report design file.
	 * @param request
	 *            Http request, used to get the session Id.
	 * @return
	 * @throws AxisFault
	 */
	protected static String createDocumentPath( String filePath,
			HttpServletRequest request )
	{
		String temp = null;
		String projectName = null;
		String documentName = null;