buttonbar.java

The Javatm Telnet Application/Applet 很好用的

                    }
                    String descr = setup.sval;  // This is the hash key.
                    token = setup.nextToken();
                    if (token == StreamTokenizer.TT_EOF) {
                      ButtonBar.this.error("unexpected end of file");
                    } else {
                      String value = setup.sval;
                      if (isKeyword(value)) {   // Missing command - complain but continue
                        System.err.println(descr + ": missing choice command");
                        setup.pushBack();
                        break;
                      }
                      System.out.println("choice: name='" + descr + "', value='" + value);
                      list.add(descr, new JLabel(descr));
                      choices.put(ident + descr, value);
                    }
                  }
                  ButtonBar.this.error("choices hash: " + choices);
                } else if (setup.sval.equals("input")) {
                  if ((token = setup.nextToken()) != StreamTokenizer.TT_EOF) {
                    String descr = setup.sval;
                    if ((token = setup.nextToken()) ==
                            StreamTokenizer.TT_NUMBER) {
                      int size = (int) setup.nval;
                      String init = "", command = "";
                      token = setup.nextToken();
                      if (isKeyword(setup.sval))
                        setup.pushBack();
                      else
                        command = setup.sval;
                      token = setup.nextToken();
                      if (isKeyword(setup.sval)) {
                        setup.pushBack();
                        init = command;
                      } else
                        init = setup.sval;
                      JTextField t = new JTextField(init, size);
                      if (!init.equals(command)) {
                        buttons.put(t, command);
                        t.addActionListener(ButtonBar.this);
                      }
                      fields.put(descr, t);
                      l.setConstraints(t, constraints(c, setup));
                      panel.add(t);
                    } else
                      ButtonBar.this.error(descr + ": missing field size");
                  } else
                    ButtonBar.this.error("unexpected end of file");
                }
                break;
              default:
                ButtonBar.this.error("syntax error at line " + setup.lineno());
            }
          }
        } catch (IOException e) {
          ButtonBar.this.error("unexpected error while reading setup: " + e);
        }
        panel.validate();
      }
    });
  }

  private GridBagConstraints constraints(GridBagConstraints c,
                                         StreamTokenizer setup)
          throws IOException {
    if (setup.nextToken() == StreamTokenizer.TT_WORD)
      if (setup.sval.equals("break"))
        c.gridwidth = GridBagConstraints.REMAINDER;
      else if (setup.sval.equals("stretch"))
        c.weightx = 1.0;
      else
        setup.pushBack();
    else
      setup.pushBack();
    return c;
  }

  public void valueChanged(ListSelectionEvent evt) {
    String tmp, ident;
    if ((ident = (String) choices.get(evt.getSource())) != null) {
      // It's a choice - get the text from the selected item
      JList list = (JList) evt.getSource();
      tmp = (String) choices.get(ident + list.getSelectedValue());
      if (tmp != null) processEvent(tmp);
    }
  }

  public void actionPerformed(ActionEvent evt) {
    String tmp;
    if ((tmp = (String) buttons.get(evt.getSource())) != null)
      processEvent(tmp);
  }


  private void processEvent(String tmp) {
    String cmd = "", function = null;
    int idx = 0, oldidx = 0;
    while ((idx = tmp.indexOf('\\', oldidx)) >= 0 &&
            ++idx <= tmp.length()) {
      cmd += tmp.substring(oldidx, idx - 1);
      switch (tmp.charAt(idx)) {
        case 'b':
          cmd += "\b";
          break;
        case 'e':
          cmd += "";
          break;
        case 'n':
          cmd += "\n";
          break;
        case 'r':
          cmd += "\r";
          break;
        case '$':
          {
            int ni = tmp.indexOf('(', idx + 1);
            if (ni < idx) {
              error("ERROR: Function: missing '('");
              break;
            }
            if (ni == ++idx) {
              error("ERROR: Function: missing name");
              break;
            }
            function = tmp.substring(idx, ni);
            idx = ni + 1;
            ni = tmp.indexOf(')', idx);
            if (ni < idx) {
              error("ERROR: Function: missing ')'");
              break;
            }
            tmp = tmp.substring(idx, ni);
            idx = oldidx = 0;
            continue;
          }
        case '@':
          {
            int ni = tmp.indexOf('@', idx + 1);
            if (ni < idx) {
              error("ERROR: Input Field: '@'-End Marker not found");
              break;
            }
            if (ni == ++idx) {
              error("ERROR: Input Field: no name specified");
              break;
            }
            String name = tmp.substring(idx, ni);
            idx = ni;
            JTextField t;
            if (fields == null || (t = (JTextField) fields.get(name)) == null) {
              error("ERROR: Input Field: requested input \"" +
                    name + "\" does not exist");
              break;
            }
            cmd += t.getText();
            if (clearFields) t.setText("");
            break;
          }
        default :
          cmd += tmp.substring(idx, ++idx);
      }
      oldidx = ++idx;
    }

    if (oldidx <= tmp.length()) cmd += tmp.substring(oldidx, tmp.length());

    if (function != null) {
      if (function.equals("break")) {
        bus.broadcast(new TelnetCommandRequest((byte) 243)); // BREAK
        return;
      }
      if (function.equals("exit")) {
        try {
          System.exit(0);
        } catch (Exception e) {
          error("cannot exit: " + e);
        }
      }
      if (function.equals("connect")) {
        String address = null;
        int port = -1;
        try {
          if ((idx = cmd.indexOf(",")) >= 0) {
            try {
              port = Integer.parseInt(cmd.substring(idx + 1, cmd.length()));
            } catch (Exception e) {
              port = -1;
            }
            cmd = cmd.substring(0, idx);
          }
          if (cmd.length() > 0) address = cmd;
          if (address != null)
            if (port != -1)
              bus.broadcast(new SocketRequest(address, port));
            else
              bus.broadcast(new SocketRequest(address, 23));
          else
            error("connect: no address");
        } catch (Exception e) {
          error("connect(): failed");
          e.printStackTrace();
        }
      } else if (function.equals("disconnect"))
        bus.broadcast(new SocketRequest());
      else if (function.equals("detach")) {
        error("detach not implemented yet");
      } else
        error("ERROR: function not implemented: \"" + function + "\"");
      return;
    }
    // cmd += tmp.substring(oldidx, tmp.length());
    if (cmd.length() > 0)
      try {
        write(cmd.getBytes());
      } catch (IOException e) {
        error("send: " + e);
      }
  }

  public JComponent getPluginVisual() {
    return panel;
  }

  public JMenu getPluginMenu() {
    return null;
  }


  FilterPlugin source;

  public void setFilterSource(FilterPlugin source) {
    this.source = source;
  }

  public FilterPlugin getFilterSource() {
    return source;
  }

  public int read(byte[] b) throws IOException {
    return source.read(b);
  }

  public void write(byte[] b) throws IOException {
    source.write(b);
  }

  private static boolean isKeyword(String txt) {
    return (
            txt.equals("button") ||
            txt.equals("label") ||
            txt.equals("input") ||
            txt.equals("stretch") ||
            txt.equals("choice") ||
            txt.equals("break")
            );
  }
}