Exemple #1
0
 /**
  * Creates a container for the specified node values.
  *
  * @param doc document
  */
 protected static void create(final String doc) {
   try {
     new CreateDB(Util.className(SandboxTest.class), doc).execute(context);
   } catch (final BaseXException ex) {
     Util.notExpected(ex);
   }
 }
Exemple #2
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  /**
   * Constructor.
   *
   * @param args command-line arguments
   */
  public JaxRxServer(final String... args) {
    super(args);
    if (!success || service) return;

    // set default ports and paths
    set(BXJaxRx.JAXRXPATH, context.prop.get(Prop.JAXRXPATH), false);
    set(BXJaxRx.SERVERPORT, context.prop.num(Prop.SERVERPORT), false);
    set(BXJaxRx.SERIALIZER, context.prop.get(Prop.SERIALIZER), false);

    // store configuration in system properties
    // if a property has already been set, the new settings will be ignored

    String p = pass != null ? pass : user != null ? null : Text.ADMIN;
    while (p == null) {
      Util.out(SERVERPW + COLS);
      pass = password();
    }
    set(BXJaxRx.USER, user == null ? "" : user, user != null);
    set(BXJaxRx.PASSWORD, pass == null ? "" : pass, pass != null);

    // define path and name of the JAX-RX implementation.
    set("org.jaxrx.systemName", Text.NAMELC, false);
    set("org.jaxrx.systemPath", BXJaxRx.class.getName(), false);

    // start Jetty server (if not done yet)
    try {
      jetty = new JettyServer(context.prop.num(Prop.JAXRXPORT));
      Util.outln(JAXRX + ' ' + SERVERSTART);
    } catch (final Exception ex) {
      ex.printStackTrace();
      Util.server(ex);
    }
  }
Exemple #3
0
  /**
   * Adds the string representation of an object:
   *
   * <ul>
   *   <li>objects of type {@link Throwable} are converted to a string representation via {@link
   *       Util#message}.
   *   <li>objects of type {@link Class} are converted via {@link Util#className(Class)}.
   *   <li>{@code null} references are replaced by the string {@code "null"}.
   *   <li>byte arrays are directly inserted as tokens.
   *   <li>for all other typed, {@link Object#toString} is called.
   * </ul>
   *
   * The specified string may contain {@code "%"} characters as place holders. All place holders
   * will be replaced by the specified extensions. If a digit is specified after the place holder
   * character, it will be interpreted as insertion position.
   *
   * @param object string to be extended
   * @param ext optional extensions
   * @return self reference
   */
  public TokenBuilder addExt(final Object object, final Object... ext) {
    final byte[] t;
    if (object instanceof byte[]) {
      t = (byte[]) object;
    } else {
      final String s;
      if (object == null) {
        s = "null";
      } else if (object instanceof Throwable) {
        s = Util.message((Throwable) object);
      } else if (object instanceof Class<?>) {
        s = Util.className((Class<?>) object);
      } else {
        s = object.toString();
      }
      t = token(s);
    }

    for (int i = 0, e = 0; i < t.length; ++i) {
      if (t[i] != '%' || e == ext.length) {
        addByte(t[i]);
      } else {
        final byte c = i + 1 < t.length ? t[i + 1] : 0;
        final boolean d = c >= '1' && c <= '9';
        if (d) ++i;
        final int n = d ? c - '1' : e++;
        final Object o = n < ext.length ? ext[n] : null;
        addExt(o);
      }
    }
    return this;
  }
Exemple #4
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  /**
   * Runs the command without permission, data and concurrency checks.
   *
   * @param ctx database context
   * @param os output stream
   * @return result of check
   */
  public boolean run(final Context ctx, final OutputStream os) {
    perf = new Performance();
    context = ctx;
    prop = ctx.prop;
    mprop = ctx.mprop;
    out = PrintOutput.get(os);

    try {
      return run();
    } catch (final ProgressException ex) {
      // process was interrupted by the user or server
      abort();
      return error(INTERRUPTED);
    } catch (final Throwable ex) {
      // unexpected error
      Performance.gc(2);
      abort();
      if (ex instanceof OutOfMemoryError) {
        Util.debug(ex);
        return error(OUT_OF_MEM + (createWrite() ? H_OUT_OF_MEM : ""));
      }
      return error(Util.bug(ex) + NL + info.toString());
    } finally {
      // flushes the output
      try {
        if (out != null) out.flush();
      } catch (final IOException ignored) {
      }
    }
  }
Exemple #5
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 @Override
 public String det() {
   final String path = input.io().path();
   return path.isEmpty()
       ? Util.info(LINE_X, input.line())
       : Util.info(SCANPOS_X_X, input.io().path(), input.line());
 }
Exemple #6
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  @Override
  public final void service(final HttpServletRequest req, final HttpServletResponse res)
      throws IOException {

    final HTTPContext http = new HTTPContext(req, res, this);
    final boolean restxq = this instanceof RestXqServlet;
    try {
      run(http);
      http.log("", SC_OK);
    } catch (final HTTPException ex) {
      http.status(ex.getStatus(), Util.message(ex), restxq);
    } catch (final LoginException ex) {
      http.status(SC_UNAUTHORIZED, Util.message(ex), restxq);
    } catch (final IOException ex) {
      http.status(SC_BAD_REQUEST, Util.message(ex), restxq);
    } catch (final QueryException ex) {
      http.status(SC_BAD_REQUEST, Util.message(ex), restxq);
    } catch (final Exception ex) {
      final String msg = Util.bug(ex);
      Util.errln(msg);
      http.status(SC_INTERNAL_SERVER_ERROR, Util.info(UNEXPECTED, msg), restxq);
    } finally {
      if (Prop.debug) {
        Util.outln("_ REQUEST _________________________________" + Prop.NL + req);
        final Enumeration<String> en = req.getHeaderNames();
        while (en.hasMoreElements()) {
          final String key = en.nextElement();
          Util.outln(Text.LI + key + Text.COLS + req.getHeader(key));
        }
        Util.out("_ RESPONSE ________________________________" + Prop.NL + res);
      }
      http.close();
    }
  }
Exemple #7
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  /** Launches the console mode, which reads and executes user input. */
  private void console() {
    Util.outln(header() + NL + TRY_MORE_X);
    verbose = true;

    // create console reader
    try (final ConsoleReader cr = ConsoleReader.get()) {
      // loop until console is set to false (may happen in server mode)
      while (console) {
        // get next line
        final String in = cr.readLine(PROMPT);
        // end of input: break loop
        if (in == null) break;
        // skip empty lines
        if (in.isEmpty()) continue;

        try {
          if (!execute(new CommandParser(in, context).pwReader(cr.pwReader()))) {
            // show goodbye message if method returns false
            Util.outln(BYE[new Random().nextInt(4)]);
            break;
          }
        } catch (final IOException ex) {
          // output error messages
          Util.errln(ex);
        }
      }
    }
  }
Exemple #8
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  /**
   * Retrieves the specified value. Throws an error if value cannot be read.
   *
   * @param key key
   * @param c expected type
   * @return result
   */
  private Object get(final Object[] key, final Class<?> c) {
    final Object entry = props.get(key[0].toString());
    if (entry == null) Util.notexpected("Property " + key[0] + " not defined.");

    final Class<?> cc = entry.getClass();
    if (c != cc) Util.notexpected("Property '" + key[0] + "' is a " + Util.name(cc));
    return entry;
  }
  /**
   * Extracts and indexes words from the specified data reference.
   *
   * @throws IOException I/O Exception
   */
  final void index() throws IOException {
    // delete old index
    abort();

    final Performance perf = Prop.debug ? new Performance() : null;
    Util.debug(det());

    for (pre = 0; pre < size; ++pre) {
      if ((pre & 0xFFFF) == 0) check();

      final int k = data.kind(pre);
      if (k != Data.TEXT) {
        if (scm == 1 && k == Data.DOC) unit.add(pre);
        continue;
      }
      if (scm == 2) unit.add(pre);

      pos = -1;
      final StopWords sw = lex.ftOpt().sw;
      lex.init(data.text(pre, true));
      while (lex.hasNext()) {
        final byte[] tok = lex.nextToken();
        ++pos;
        // skip too long and stopword tokens
        if (tok.length <= data.meta.maxlen && (sw.size() == 0 || !sw.contains(tok))) {
          // check if main memory is exhausted
          if ((ntok++ & 0xFFF) == 0 && scm == 0 && memFull()) {
            // currently no frequency support for tf/idf based scoring
            writeIndex(csize++);
            Performance.gc(2);
          }
          index(tok);
        }
      }
    }

    // calculate term frequencies
    if (scm > 0) {
      maxfreq = new int[unit.size() + 1];
      ntoken = new int[nrTokens()];
      token = 0;
      calcFreq();
    }

    // write tokens
    token = 0;
    write();

    // set meta data
    if (scm > 0) {
      data.meta.maxscore = max;
      data.meta.minscore = min;
    }
    data.meta.ftxtindex = true;
    Util.memory(perf);
  }
Exemple #10
0
 /**
  * Performs a search.
  *
  * @param sc search context
  * @param jump jump to next hit
  */
 final void search(final SearchContext sc, final boolean jump) {
   try {
     rend.search(sc);
     if (!sc.search.isEmpty()) gui.status.setText(Util.info(Text.STRINGS_FOUND_X, sc.nr()));
     if (jump) jump(SearchDir.CURRENT, false);
   } catch (final Exception ex) {
     final String msg = Util.message(ex).replaceAll(Prop.NL + ".*", "");
     gui.status.setError(Text.REGULAR_EXPR + Text.COLS + msg);
   }
 }
Exemple #11
0
 /**
  * Checks if specified query was rewritten for index access, and checks the query result.
  *
  * @param query query to be tested
  * @param result result or {@code null} for no comparison
  */
 private static void check(final String query, final String result) {
   check(
       query,
       result,
       "exists(/descendant-or-self::*"
           + "[self::"
           + Util.className(ValueAccess.class)
           + "|self::"
           + Util.className(FTIndexAccess.class)
           + "])");
 }
Exemple #12
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 static {
   try {
     final Class<?>[] classes = Loader.load(IFileParser.class.getPackage(), IFileParser.class);
     for (final Class<?> c : classes) {
       final String name = Util.name(c);
       if (!REGISTRY.containsValue(c) && fallbackParser != c)
         Util.debug("Loading % ... FAILED", name);
     }
   } catch (final IOException ex) {
     Util.errln("Failed to load parsers (%)", ex.getMessage());
   }
 }
Exemple #13
0
  @Override
  public JapaneseTokenizer init(final byte[] txt) {
    String source = string(txt);
    if (wc) { // convert wide-space to space
      source = source.replace('\u3000', '\u0020');
    }
    final ArrayList<?> morpheme = (ArrayList<?>) Reflect.invoke(parse, tagger, source);
    final ArrayList<Morpheme> list = new ArrayList<>();
    try {
      int prev = 0;
      final int ms = morpheme.size();
      for (int i = 0; i < ms; i++) {
        final Object m = morpheme.get(i);
        final String srfc = surface.get(m).toString();
        final String ftr = feature.get(m).toString();
        final int strt = start.getInt(m);
        if (i != 0) {
          final int l = strt - prev;
          if (l != 0) {
            list.add(new Morpheme(source.substring(strt - 1, strt + l - 1), KIGOU_FEATURE));
          }
        }
        prev = srfc.length() + strt;

        // separates continuous mark (ASCII)
        boolean cont = true;
        final ArrayList<Morpheme> marks = new ArrayList<>();
        final int sl = srfc.length();
        for (int s = 0; s < sl; s++) {
          final String c = String.valueOf(srfc.charAt(s));
          final byte[] t = token(c);
          if (t.length == 1) {
            if (letter(t[0]) || digit(t[0])) cont = false;
            else marks.add(new Morpheme(c, KIGOU_FEATURE));
          } else {
            cont = false;
          }
        }

        if (cont) list.addAll(marks);
        else list.add(new Morpheme(srfc, ftr));
      }
    } catch (final Exception ex) {
      Util.errln(Util.className(this) + ": " + ex);
    }
    tokenList = list;
    tokens = list.iterator();

    return this;
  }
 @Override
 public boolean lock(final boolean lock) {
   try {
     if (lock) {
       if (exclusiveLock()) return true;
       if (sharedLock()) return false;
     } else {
       if (sharedLock()) return true;
     }
   } catch (final IOException ex) {
     Util.stack(ex);
   }
   throw Util.notExpected((lock ? "Exclusive" : "Shared") + " lock could not be acquired.");
 }
Exemple #15
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  @Override
  public DiskData build() throws IOException {
    meta.assign(parser);
    meta.dirty = true;

    // calculate optimized output buffer sizes to reduce disk fragmentation
    final Runtime rt = Runtime.getRuntime();
    final long max = Math.min(1 << 22, rt.maxMemory() - rt.freeMemory() >> 2);
    int bs = (int) Math.min(meta.filesize, max);
    bs = Math.max(IO.BLOCKSIZE, bs - bs % IO.BLOCKSIZE);

    // drop old database (if available) and create new one
    DropDB.drop(dbname, sopts);
    sopts.dbpath(dbname).md();

    elemNames = new Names(meta);
    attrNames = new Names(meta);
    try {
      tout = new DataOutput(new TableOutput(meta, DATATBL));
      xout = new DataOutput(meta.dbfile(DATATXT), bs);
      vout = new DataOutput(meta.dbfile(DATAATV), bs);
      sout = new DataOutput(meta.dbfile(DATATMP), bs);

      final Performance perf = Prop.debug ? new Performance() : null;
      Util.debug(tit() + DOTS);
      parse();
      if (Prop.debug) Util.errln(" " + perf + " (" + Performance.getMemory() + ')');

    } catch (final IOException ex) {
      try {
        close();
      } catch (final IOException ignored) {
      }
      throw ex;
    }
    close();

    // copy temporary values into database table
    try (final DataInput in = new DataInput(meta.dbfile(DATATMP))) {
      final TableAccess ta = new TableDiskAccess(meta, true);
      for (; spos < ssize; ++spos) ta.write4(in.readNum(), 8, in.readNum());
      ta.close();
    }
    meta.dbfile(DATATMP).delete();

    // return database instance
    return new DiskData(meta, elemNames, attrNames, path, ns);
  }
Exemple #16
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 /**
  * Shows a quit dialog for the specified editor.
  *
  * @param edit editor to be saved
  * @return {@code false} if confirmation was canceled
  */
 private boolean confirm(final EditorArea edit) {
   if (edit.modified && (edit.opened() || edit.getText().length != 0)) {
     final Boolean ok = BaseXDialog.yesNoCancel(gui, Util.info(CLOSE_FILE_X, edit.file.name()));
     if (ok == null || ok && !save()) return false;
   }
   return true;
 }
Exemple #17
0
  /**
   * Executes a query.
   *
   * @param query query to be executed
   * @return list of serialized result items
   * @throws IOException error during query execution
   */
  private StringList execute(final WebDAVQuery query) throws IOException {
    final ClassLoader cl = getClass().getClassLoader();
    final InputStream s = cl.getResourceAsStream(FILE);
    if (s == null) throw new IOException("WebDAV module not found");
    final byte[] module = new IOStream(s).read();

    final QueryProcessor qp = new QueryProcessor(query.toString(), http.context());
    try {
      for (final Entry<String, Object> entry : query.entries()) {
        qp.bind(entry.getKey(), entry.getValue());
      }
      qp.ctx.parseLibrary(string(module), FILE, qp.sc);

      final Result r = qp.execute();
      final int n = (int) r.size();
      final StringList items = new StringList(n);
      for (int i = 0; i < n; i++) {
        final ArrayOutput ao = new ArrayOutput();
        r.serialize(Serializer.get(ao), 0);
        items.add(ao.toString());
      }
      return items;
    } catch (final QueryException ex) {
      throw new BaseXException(ex);
    } catch (final Exception ex) {
      Util.debug(ex);
      throw new BaseXException(ex);
    } finally {
      qp.close();
    }
  }
Exemple #18
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  /**
   * Creates query plans.
   *
   * @param comp compiled flag
   */
  private void plan(final boolean comp) {
    if (comp != options.get(MainOptions.COMPPLAN)) return;

    // show dot plan
    try {
      if (options.get(MainOptions.DOTPLAN)) {
        final String path = options.get(MainOptions.QUERYPATH);
        final String dot =
            path.isEmpty() ? "plan.dot" : new IOFile(path).name().replaceAll("\\..*?$", ".dot");

        try (final BufferOutput bo = new BufferOutput(dot)) {
          try (final DOTSerializer d = new DOTSerializer(bo, options.get(MainOptions.DOTCOMPACT))) {
            d.serialize(qp.plan());
          }
        }
      }

      // show XML plan
      if (options.get(MainOptions.XMLPLAN)) {
        info(NL + QUERY_PLAN + COL);
        info(qp.plan().serialize().toString());
      }
    } catch (final Exception ex) {
      Util.stack(ex);
    }
  }
Exemple #19
0
 static {
   try {
     DF = DatatypeFactory.newInstance();
   } catch (final Exception ex) {
     throw Util.notExpected(ex);
   }
 }
Exemple #20
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  /** Notifies all views of a data reference change. */
  public void init() {
    final Data data = initHistory(gui.context);
    if (data != null) {
      // if a large database is opened, the user is asked if complex
      /// visualizations should be closed first
      final long size = data.meta.dbsize();
      boolean open = false;
      for (final View v : view) open |= v.visible() && v.db();
      if (open
          && size > LARGEDB
          && BaseXDialog.confirm(gui, Util.info(H_LARGE_DB, Performance.format(size)))) {
        for (final View v : view) if (v.visible() && v.db()) v.visible(false);
      }
    } else {
      // database closed: close open dialogs
      for (final Window w : gui.getOwnedWindows()) {
        if (w.isVisible() && w instanceof BaseXDialog) ((BaseXDialog) w).cancel();
      }
    }

    gui.context.focused = -1;
    for (final View v : view) v.refreshInit();
    gui.layoutViews();
    gui.setTitle(data != null ? data.meta.name : null);
  }
Exemple #21
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  @Override
  public synchronized void finishUpdate(final MainOptions opts) {
    // remove updating file
    final boolean auto = opts.get(MainOptions.AUTOFLUSH);
    if (auto) {
      final IOFile uf = meta.updateFile();
      if (!uf.exists()) throw Util.notExpected("%: lock file does not exist.", meta.name);
      if (!uf.delete()) throw Util.notExpected("%: could not delete lock file.", meta.name);
    }

    // db:optimize(..., true) will close the database before this function is called
    if (!closed) {
      flush(auto);
      if (!table.lock(false)) throw Util.notExpected("Database '%': could not unlock.", meta.name);
    }
  }
Exemple #22
0
 /**
  * Creates the error message from the specified text and extension array.
  *
  * @param text text message with optional placeholders
  * @param ext info extensions
  * @return argument
  */
 private static String message(final String text, final Object[] ext) {
   final int es = ext.length;
   for (int e = 0; e < es; e++) {
     if (ext[e] instanceof ExprInfo) ext[e] = chop(((ExprInfo) ext[e]).toErrorString(), null);
   }
   return Util.info(text, ext);
 }
 @Override
 public void run() {
   running = true;
   while (running) {
     try {
       final Socket s = socket.accept();
       if (stop.exists()) {
         if (!stop.delete()) log.write(Util.info(FILE_NOT_DELETED_X, stop));
         quit();
       } else {
         // drop inactive connections
         final long ka = context.mprop.num(MainProp.KEEPALIVE) * 1000L;
         if (ka > 0) {
           final long ms = System.currentTimeMillis();
           for (final ClientListener cs : context.sessions) {
             if (ms - cs.last > ka) cs.quit();
           }
         }
         new ClientListener(s, context, log, this).start();
       }
     } catch (final IOException ex) {
       // socket was closed..
       break;
     }
   }
 }
Exemple #24
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  @Override
  public void action(final Object comp) {
    final boolean valid = general.action(comp, true);
    ft.action(ftxindex.isSelected());

    // ...must be located before remaining checks
    if (comp == general.browse || comp == general.input) dbname.setText(general.dbname);

    final String nm = dbname.getText().trim();
    ok = valid && !nm.isEmpty();

    String inf = valid ? ok ? null : ENTER_DB_NAME : RES_NOT_FOUND;
    Msg icon = Msg.ERROR;
    if (ok) {
      ok = Databases.validName(nm);
      if (ok) gui.gopts.set(GUIOptions.DBNAME, nm);

      if (!ok) {
        // name of database is invalid
        inf = Util.info(INVALID_X, NAME);
      } else if (general.input.getText().trim().isEmpty()) {
        // database will be empty
        inf = EMPTY_DB;
        icon = Msg.WARN;
      } else if (db.contains(nm)) {
        // old database will be overwritten
        inf = OVERWRITE_DB;
        icon = Msg.WARN;
      }
    }

    general.info.setText(inf, icon);
    enableOK(buttons, B_OK, ok);
  }
Exemple #25
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  /** Saves the displayed text. */
  private void save() {
    final BaseXFileChooser fc =
        new BaseXFileChooser(SAVE_AS, gui.gopts.get(GUIOptions.WORKPATH), gui).suffix(IO.XMLSUFFIX);

    final IO file = fc.select(Mode.FSAVE);
    if (file == null) return;
    gui.gopts.set(GUIOptions.WORKPATH, file.path());

    gui.cursor(CURSORWAIT, true);
    final MainOptions opts = gui.context.options;
    final int mh = opts.get(MainOptions.MAXHITS);
    opts.set(MainOptions.MAXHITS, -1);
    opts.set(MainOptions.CACHEQUERY, false);

    try (final PrintOutput out = new PrintOutput(file.toString())) {
      if (cmd != null) {
        cmd.execute(gui.context, out);
      } else if (ns != null) {
        ns.serialize(Serializer.get(out));
      } else {
        final byte[] txt = text.getText();
        for (final byte t : txt) if (t < 0 || t > ' ' || ws(t)) out.write(t);
      }
    } catch (final IOException ex) {
      BaseXDialog.error(gui, Util.info(FILE_NOT_SAVED_X, file));
    } finally {
      opts.set(MainOptions.MAXHITS, mh);
      opts.set(MainOptions.CACHEQUERY, true);
      gui.cursor(CURSORARROW, true);
    }
  }
Exemple #26
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    @Override
    public void execute(final GUI gui) {
      final DialogExport dialog = new DialogExport(gui);
      if (!dialog.ok()) return;

      final IOFile root = new IOFile(dialog.path());

      // check if existing files will be overwritten
      if (root.exists()) {
        IO file = null;
        boolean overwrite = false;
        final Data d = gui.context.data();
        final IntList il = d.resources.docs();
        final int is = il.size();
        for (int i = 0; i < is; i++) {
          file = root.merge(Token.string(d.text(il.get(i), true)));
          if (file.exists()) {
            if (overwrite) {
              // more than one file will be overwritten; check remaining tests
              file = null;
              break;
            }
            overwrite = true;
          }
        }
        if (overwrite) {
          // show message for overwriting files or directories
          final String msg = file == null ? FILES_REPLACE_X : FILE_EXISTS_X;
          if (file == null) file = root;
          if (!BaseXDialog.confirm(gui, Util.info(msg, file))) return;
        }
      }
      DialogProgress.execute(gui, new Export(root.path()));
    }
Exemple #27
0
 /**
  * Returns the specified image.
  *
  * @param url image url
  * @return image
  */
 public static Image get(final URL url) {
   try {
     return ImageIO.read(url);
   } catch (final IOException ex) {
     throw Util.notExpected(ex);
   }
 }
Exemple #28
0
 /**
  * Returns the combo box selections and the keys of the specified set.
  *
  * @param key keys
  * @return key array
  */
 private String[] entries(final byte[][] key) {
   final StringList sl = new StringList();
   sl.add(Util.info(INFOENTRIES, key.length));
   for (final byte[] k : key) sl.add(Token.string(k));
   sl.sort(true, true, 1);
   return sl.toArray();
 }
Exemple #29
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  /**
   * Searches a string in a file.
   *
   * @param path file path
   * @param search codepoints of search string
   * @return success flag
   */
  private static boolean filterContent(final String path, final int[] search) {
    final int cl = search.length;
    if (cl == 0) return true;

    try (final TextInput ti = new TextInput(new IOFile(path))) {
      final IntList il = new IntList(cl - 1);
      int c = 0;
      while (true) {
        if (!il.isEmpty()) {
          if (il.remove(0) == search[c++]) continue;
          c = 0;
        }
        while (true) {
          final int cp = ti.read();
          if (cp == -1 || !XMLToken.valid(cp)) return false;
          final int lc = Token.lc(cp);
          if (c > 0) il.add(lc);
          if (lc == search[c]) {
            if (++c == cl) return true;
          } else {
            c = 0;
            break;
          }
        }
      }
    } catch (final IOException ex) {
      // file may not be accessible
      Util.debug(ex);
      return false;
    }
  }
Exemple #30
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 /**
  * Assumes that this command is successful.
  *
  * @param cmd command reference
  * @param s session
  */
 private static void ok(final Command cmd, final Session s) {
   try {
     s.execute(cmd);
   } catch (final IOException ex) {
     fail(Util.message(ex));
   }
 }