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
* @return max rows
	 */
	public static int getMaxRows( HttpServletRequest request )
	{
		int curMaxRows = ParameterAccessor.getParameterAsInt( request,
				PARAM_MAXROWS );
		if ( curMaxRows <= 0 )
			curMaxRows = maxRows;
		return curMaxRows;
	}
	/**
	 * Get report element's iid.
	 * 
	 * @param request
	 * @return report element's iid
	 */
	public static String getIId( HttpServletRequest request )
	{
		return getReportParameter( request, PARAM_IID, null );
	}
	/**
	 * Get report locale from Http request.
	 * 
	 * @param request
	 *            http request
	 * @return report locale
	 */
	public static Locale getLocale( HttpServletRequest request )
	{
		Locale locale = null;