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
if ( title == null )
		{
			title = BirtResources
					.getMessage( ResourceConstants.BIRT_VIEWER_TITLE );
		}
		return htmlEncode( title );
	}
	/**
	 * Get report format.
	 * 
	 * @param request
	 *            http request
	 * @return report format
	 */
	public static String getFormat( HttpServletRequest request )
	{
		String format = getParameter( request, PARAM_FORMAT );
		if ( format != null && format.length( ) > 0 )
		{
			if ( PARAM_FORMAT_HTM.equalsIgnoreCase( format ) )
				return PARAM_FORMAT_HTML;
			return format;
		}
		return PARAM_FORMAT_HTML; 
	}
	/**
	 * Get preview max rows.
	 * 
	 * @param request
	 *            http request