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
locale = getLocaleFromString( getParameter( request, PARAM_LOCALE ) );
		
		if ( locale == null )
			locale = request.getLocale( );
		
		if ( locale == null )
			locale = webAppLocale;
		return locale;
	}
	/**
	 * Check whether the viewer is set rtl option.
	 * 
	 * @param request
	 * @return
	 */
	public static boolean isRtl( HttpServletRequest request )
	{
		boolean isRtl = false;
		if ( "true".equalsIgnoreCase( getParameter( request, PARAM_RTL ) ) ) 
		{
			isRtl = true;
		}
		return isRtl;
	}
	/**
	 * Get report locale from a given string.
	 * 
	 * @param locale
	 *            locale string