netservlet.java

derby database source code.good for you.

			printErrorForm(localUtil, request, e, returnMessage);
		}
		return retval;
	}
	/**
	 *	Turn logging of connections on
	 *
	 * @param localUtil	LocalizedResource to use to translate messages
	 * @param request HttpServetRequest for  forms
	 * @param returnMessage	localized continue message for continue button on error form	
	 * @return true if succeeded; false; otherwise
	 */
	private boolean logging(LocalizedResource localUtil, boolean val,
		HttpServletRequest request, String returnMessage)
	{
		boolean retval = false;
		try {
			server.logConnections(val);
			retval = true;
		} catch (Exception e) 
		{
			printErrorForm(localUtil, request, e, returnMessage);
		}
		return retval;
	}
	/**
	 *	Change tracing for all sessions 
	 *
	 * @param localUtil	LocalizedResource to use to translate messages
	 * @param val	if true, turn tracing on, if false turn it off
	 * @param request HttpServetRequest for  forms
	 * @param returnMessage	localized continue message for continue button on error form	
	 * @return true if succeeded; false; otherwise
	 */
	private boolean traceAll(LocalizedResource localUtil, boolean val,
		HttpServletRequest request, String returnMessage)
	{
		boolean retval = false;
		try {
			server.trace(val);
			retval = true;
		} catch (Exception e) 
		{
			printErrorForm(localUtil, request, e, returnMessage);
		}
		return retval;
	}
	/**
	 *	Change tracing for a given session
	 *
	 * @param localUtil	LocalizedResource to use to translate messages
	 * @param val	if true, turn tracing on, if false turn it off
	 * @param session	session to trace
	 * @param request HttpServetRequest for  forms
	 * @param returnMessage	localized continue message for continue button on error form	
	 * @return true if succeeded; false; otherwise
	 */
	private boolean traceSession(LocalizedResource localUtil, boolean val, int session,
		HttpServletRequest request, String returnMessage)
	{
		boolean retval = false;
		try {
			server.trace(session, val);
			retval = true;
		} catch (Exception e) 
		{
			printErrorForm(localUtil, request, e, returnMessage);
		}
		return retval;
	}

	/**
	 * Set trace directory
	 *
	 * @param localUtil	LocalizedResource to use to translate messages
	 * @param traceDirectory	directory for trace files
	 * @param request 			HttpServetRequest for  forms
	 * @param returnMessage		localized continue message for continue 
	 *							button on error form	
	 * @return true if succeeded; false; otherwise
	 */
	private boolean traceDirectory(LocalizedResource localUtil, String traceDirectory,
		HttpServletRequest request, String returnMessage)
	{
		boolean retval = false;

		if ((traceDirectory == null) || traceDirectory.equals("")) {
			printErrorForm(localUtil, request,
				localUtil.getTextMessage("SRV_MissingParam",
				localUtil.getTextMessage("SRV_TraceDir")), returnMessage);

			return retval;
		}

		try {
			server.setTraceDirectory(traceDirectory);
			retval = true;
		} catch (Exception e) 
		{
			printErrorForm(localUtil, request, e, returnMessage);
		}
		return retval;
	}

	/**
	 * Set Network server parameters
	 *
	 * @param localUtil	LocalizedResource to use to translate messages
	 * @param max				maximum number of threads
	 * @param slice				time slice for each connection
	 * @param request 			HttpServetRequest for  forms
	 * @param returnMessage		localized continue message for continue 
	 *							button on error form	
	 * @return true if succeeded; false; otherwise
	 */
	private boolean setNetParam(LocalizedResource localUtil, int max, int slice,
		HttpServletRequest request, String returnMessage)
	{
		boolean retval = false;

		try {
			server.setMaxThreads(max);
			server.setTimeSlice(slice);
			retval = true;
		} catch (Exception e) 
		{
			printErrorForm(localUtil, request, e, returnMessage);
		}
		return retval;
	}


	/** 
	 * Set defaults for logging and tracing (both off)
	 */
	private void setDefaults()
	{
		logStatus = false;
		traceStatus = false;
	}
	/**
	 * Get an integer parameter
	 *
	 * @param request 			HttpServetRequest for  forms
	 * @param name				parameter name
	 * @param fieldKey			Key for the name of the field we're reading.
	 * @param localUtil				LocalizedResource to use in localizing messages
	 * @param returnMessage		localized continue message for continue 
	 *							button on error form	
	 */
	private int getIntParameter(HttpServletRequest request,
			String name, String fieldKey, LocalizedResource localUtil, String returnMessage)
	{
		String val = request.getParameter(name);
		int retval;
		if (val == null || val.equals(""))
			return NOT_GIVEN;
		try {
		 	retval = (new Integer(val)).intValue();
		} catch (Exception e) {
			printErrorForm(localUtil, request,localUtil.getTextMessage("SRV_InvalidVal",
				val, localUtil.getTextMessage(fieldKey)), returnMessage);
			return INVALID;
		}
		if (retval < 0) {
		// negative integers not allowed for the parameters we're getting.
			printErrorForm(localUtil, request, localUtil.getTextMessage("SRV_InvalidVal",
				val, localUtil.getTextMessage(fieldKey)), returnMessage);
			return INVALID;
		}
		return retval;
	}
	/**
	 * Print Derby Network Server banner
	 */
	private void printBanner(LocalizedResource localUtil)
	{
		out.println("<a href=\"#navskip\">[ " +
		localUtil.getTextMessage("SRV_SkipToContent") + " ]</a>");
		out.println("  -  <a href=\"" + SERVLET_ADDRESS + "\">[ " +
		localUtil.getTextMessage("SRV_BackToMain") + " ]</a>");
		out.println( "<html>" );		
		out.println( "<title>"+localUtil.getTextMessage("SRV_Banner")+"</title>" );
		out.println( "<body>" ); 	
		out.println( "<hr>" );
		out.println( "<h1>"+localUtil.getTextMessage("SRV_Banner")+"</h1>" );
		out.println( "<hr>" );

	}
	/**
	 * Determine the locale file needed for this browsers preferences
	 * Defaults to the settings for derby.locale and derby.codeset if set
	 *		English otherwise if browsers preferences can't be found
	 *
	 * @param request 			HttpServetRequest for forms
	 * @return the appUI which fits the browsers preferences
	 */
	private LocalizedResource getCurrentAppUI(HttpServletRequest request)
	{
		LocalizedResource localUtil;
		String acceptLanguage = request.getHeader("Accept-Language");
		localUtil = new LocalizedResource(null,null,SERVLET_PROP_MESSAGES);
		// if no language specified use one set by derby.locale, derby.codeset
		locale = null;
		if (acceptLanguage == null)
		{
			return localUtil;
		}
		// Use a tokenizer ot separate acceptable languages
		StringTokenizer tokenizer = new StringTokenizer(acceptLanguage, ",");
		while (tokenizer.hasMoreTokens())
		{
			//Get the next acceptable language
			String lang = tokenizer.nextToken();
			lang = getLocStringFromLanguage(lang);
			int langindex = translationAvailable(lang);
			// have we found one
			if (langindex != -1)
			{
				localUtil.init(null, lang, SERVLET_PROP_MESSAGES);
				// locale will be passed to server, server routines will get set appropriately
				locale = lang;
				return localUtil;
			}
		}
		// nothing worked use defaults
		return localUtil;
		
	}
	/**
	 * Get locale string from language which may have qvalue set
	 * 
	 * @param lang	language string to parse
	 *
	 * @return stripped language string to use in matching
	 */
	private String getLocStringFromLanguage(String lang)
	{
		int semi;
		// Cut off any q-value that might come after a semi-colon
		if ((semi = lang.indexOf(';')) != -1)
		{
			lang = lang.substring(0, semi);
		}
		// trim any whitespace
		lang = lang.trim();
		
		return lang;
	}
	/**
	 * Check if the required translation is available
	 *
	 * @param lang	language we are looking for
	 * 
	 * @return index into language array if found, -1 otherwise;
	 */
	private int translationAvailable(String lang)
	{
		for (int i = 0; i < knownLang.length; i++)
			if (knownLang[i].toUpperCase(Locale.ENGLISH).equals(lang.toUpperCase(Locale.ENGLISH)))
				return i;
		return -1;
	}

	/**
	 * get an HTML labelled message from the resource bundle file, according to
	 * the given key.
	 */
	public String getHtmlLabelledMessageInstance(LocalizedResource localUtil, String key, String id) {

		if (id == null)
			id = "";

		return ("<label for='" + id + "'>" + localUtil.getTextMessage(key) +
			"</label>");

	}

	/**
	 * Print the received string as a header.
	 * @param str The string to be printed as a header.
	 */
	private void printAsContentHeader(String str) {

		out.println("<a name=\"navskip\"></a><h2>" + str + "</h2>");
		return;

	}

	/**
	 * If the received string has one or more single quotes
	 * in it, replace each one with the HTML escape-code
	 * for a single quote (apostrophe) so that the string 
	 * can be properly displayed on a submit button.
	 * @param str The string in which we want to escape
	 *  single quotes.
	 */
	private String escapeSingleQuotes(String str) {

		if ((str == null) || (str.indexOf("'") < 0))
			return str;

		char [] cA = str.toCharArray();

		// Worst (and extremely unlikely) case is every 
		// character is a single quote, which means the
		// escaped string would need to be 4 times as long.
		char [] result = new char[4*cA.length];

		int j = 0;
		for (int i = 0; i < cA.length; i++) {

			if (cA[i] == '\'') {
				result[j++] = '&';
				result[j++] = '#';
				result[j++] = '3';
				result[j++] = '9';
			}
			else
				result[j++] = cA[i];

		}

		return new String(result, 0, j);

	}

	private static boolean isServerStarted(NetworkServerControl server, int ntries)
	{
		for (int i = 1; i <= ntries; i ++)
		{
			try {
				Thread.sleep(500);
				server.ping();
				return true;
			}
			catch (Exception e) {
				if (i == ntries)
					return false;
			}
		}
		return false;
	}
	
}