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
/**
	 * Check whether enable svg support or not.
	 * 
	 * @param request
	 *            http request
	 * @return whether or not render content toolbar
	 */
	public static boolean getSVGFlag( HttpServletRequest request )
	{
		boolean svg = false;
		if ( "true".equalsIgnoreCase( getParameter( request, PARAM_SVG ) ) ) 
		{
			svg = true;
		}
		return svg;
	}
	/**
	 * Get web application locale.
	 * 
	 * @return report locale
	 */
	public static Locale getWebAppLocale( )
	{
		return webAppLocale;
	}
	/**
	 * This function is used to encode an ordinary string that may contain
	 * characters or more than one consecutive spaces for appropriate HTML
	 * display.
	 *