scripting/examples/java/Newsgroup/PostNewsgroup.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19 package org.libreoffice.example.java_scripts;
  20
  21 import java.awt.*;
  22 import java.awt.event.*;
  23 import javax.swing.*;
  24 import javax.swing.border.*;
  25 import java.util.Vector;
  26 import com.sun.star.script.framework.runtime.XScriptContext;
  27
  28
  29 public class PostNewsgroup extends JFrame {
  30
  31     // Post to newsgroup objects
  32     private NewsGroup[] subscribedNewsgroups = null;
  33     private XScriptContext xscriptcontext = null;
  34
  35     private final int FRAMEX = 300;
  36     private final int FRAMEY = 300;
  37     private final int TEXTBOXWIDTH = 300;
  38     private final int TEXTBOXHEIGHT = 24;
  39     private final int TEXTAREAHEIGHT = 70;
  40     private final int BUTTONWIDTH = 80;
  41     private final int BUTTONHEIGHT = 30;
  42
  43     private PostNewsgroup window = null;
  44     private JComboBox newsgroupComboBox = null;
  45     private JTextField hostTextField = null;
  46     private JTextField replyTextField = null;
  47     private JTextField subjectTextField = null;
  48     private JTextArea commentTextArea = null;
  49     private JRadioButton officeHtmlButton = null;
  50     private JRadioButton officeButton = null;
  51     private JRadioButton htmlButton = null;
  52     private JButton postButton = null;
  53     private JButton cancelButton = null;
  54
  55     // JFrame for launch progress dialog
  56     private StatusWindow statusWindow = null;
  57     private String statusLine = "";
  58
  59     // Tool tip text
  60     private final String newsgroupText = "Newsgroup name";
  61     private final String hostText = "Newsgroup host/server name";
  62     private final String replyText = "Email address to reply to";
  63     private final String subjectText = "Subject title for the mail";
  64     private final String commentText = "Additional comment on mail";
  65     private final String officeHtmlText =
  66         "Post as both Office and HTML attachments";
  67     private final String officeText = "Post as Office attachment only";
  68     private final String htmlText = "Post as HTML attachment only";
  69     private final String postText = "Post to newsgroup";
  70     private final String cancelText = "Cancel post to newsgroup";
  71
  72
  73     public void post(XScriptContext xsc) {
  74         xscriptcontext = xsc;
  75         window = this;
  76
  77         // create mailcap and mimetypes files (fix for classloader problem)
  78         MimeConfiguration.createFiles(xscriptcontext);
  79
  80         this.setTitle("Post Document To Newsgroup");
  81         this.setLocation(FRAMEX, FRAMEY);
  82
  83         this.addFocusListener(new FocusAdapter() {
  84             public void focusGained(FocusEvent event) {
  85                 System.out.println("Focus gained");
  86                 window.update(window.getGraphics());
  87             }
  88
  89             public void focusLost(FocusEvent event) {
  90                 System.out.println("Focus lost");
  91             }
  92         });
  93
  94         Container container = getContentPane();
  95         container.setLayout(new GridBagLayout());
  96         GridBagConstraints constraints = new GridBagConstraints();
  97         constraints.fill = GridBagConstraints.BOTH;
  98
  99         JPanel labelPanel = constructLabelPanel();
 100         JPanel textPanel = constructTextPanel();
 101         JPanel optionPanel = constructOptionPanel();
 102         JPanel buttonPanel = constructButtonPanel();
 103
 104         constraints.gridx = 0;
 105         constraints.gridy = 0;
 106         constraints.gridwidth = 1;
 107         constraints.gridheight = 3;
 108         constraints.insets = new Insets(15, 15, 5, 5);
 109         container.add(labelPanel, constraints);
 110
 111         constraints.gridx = 1;
 112         constraints.gridy = 0;
 113         constraints.gridwidth = 4;
 114         constraints.gridheight = 3;
 115         constraints.insets = new Insets(15, 5, 5, 15);
 116         container.add(textPanel, constraints);
 117
 118         constraints.gridx = 0;
 119         constraints.gridy = 3;
 120         constraints.gridwidth = 5;
 121         constraints.gridheight = 1;
 122         constraints.insets = new Insets(5, 15, 5, 15);
 123         container.add(optionPanel, constraints);
 124
 125         constraints.gridx = 0;
 126         constraints.gridy = 4;
 127         constraints.gridwidth = 5;
 128         constraints.gridheight = 1;
 129         constraints.insets = new Insets(5, 5, 5, 5);
 130         container.add(buttonPanel, constraints);
 131
 132         this.pack();
 133         this.setResizable(false);
 134         this.setVisible(true);
 135     }
 136
 137
 138     private JPanel constructLabelPanel() {
 139         JLabel newsgroupLabel = new JLabel("Newsgroup:");
 140         JLabel hostLabel = new JLabel("Host:");
 141         JLabel replyLabel = new JLabel("Reply:");
 142         JLabel subjectLabel = new JLabel("Subject:");
 143         JLabel commentLabel = new JLabel("Comment:");
 144
 145         newsgroupLabel.setToolTipText(newsgroupText);
 146         hostLabel.setToolTipText(hostText);
 147         replyLabel.setToolTipText(replyText);
 148         subjectLabel.setToolTipText(subjectText);
 149         commentLabel.setToolTipText(commentText);
 150
 151         JPanel newsgroupPanel = new JPanel();
 152         newsgroupPanel.setLayout(new BorderLayout());
 153         newsgroupPanel.add(newsgroupLabel, "West");
 154         JPanel hostPanel = new JPanel();
 155         hostPanel.setLayout(new BorderLayout());
 156         hostPanel.add(hostLabel, "West");
 157         JPanel replyPanel = new JPanel();
 158         replyPanel.setLayout(new BorderLayout());
 159         replyPanel.add(replyLabel, "West");
 160         JPanel subjectPanel = new JPanel();
 161         subjectPanel.setLayout(new BorderLayout());
 162         subjectPanel.add(subjectLabel, "West");
 163         JPanel commentPanel = new JPanel();
 164         commentPanel.setLayout(new BorderLayout());
 165         commentPanel.add(commentLabel, "West");
 166         JPanel emptyPanel = new JPanel();
 167
 168         final int labelWidth = 80;
 169         newsgroupPanel.setPreferredSize(new Dimension(labelWidth, TEXTBOXHEIGHT));
 170         hostPanel.setPreferredSize(new Dimension(labelWidth, TEXTBOXHEIGHT));
 171         replyPanel.setPreferredSize(new Dimension(labelWidth, TEXTBOXHEIGHT));
 172         subjectPanel.setPreferredSize(new Dimension(labelWidth, TEXTBOXHEIGHT));
 173         commentPanel.setPreferredSize(new Dimension(labelWidth, TEXTBOXHEIGHT));
 174
 175         JPanel panel = new JPanel();
 176         panel.setLayout(new GridBagLayout());
 177         GridBagConstraints constraints = new GridBagConstraints();
 178         constraints.fill = GridBagConstraints.BOTH;
 179         constraints.insets = new Insets(5, 5, 5, 5);
 180
 181         constraints.gridx = 0;
 182         constraints.gridy = 0;
 183         constraints.gridwidth = 1;
 184         constraints.gridheight = 1;
 185         constraints.weightx = constraints.weighty = 0.0;
 186         panel.add(newsgroupPanel, constraints);
 187
 188         constraints.gridx = 0;
 189         constraints.gridy = 1;
 190         constraints.gridwidth = 1;
 191         constraints.gridheight = 1;
 192         panel.add(hostPanel, constraints);
 193
 194         constraints.gridx = 0;
 195         constraints.gridy = 2;
 196         constraints.gridwidth = 1;
 197         constraints.gridheight = 1;
 198         panel.add(replyPanel, constraints);
 199
 200         constraints.gridx = 0;
 201         constraints.gridy = 3;
 202         constraints.gridwidth = 1;
 203         constraints.gridheight = 1;
 204         panel.add(subjectPanel, constraints);
 205
 206         constraints.gridx = 0;
 207         constraints.gridy = 4;
 208         constraints.gridwidth = 1;
 209         constraints.gridheight = 1;
 210         panel.add(commentPanel, constraints);
 211
 212         constraints.gridx = 0;
 213         constraints.gridy = 5;
 214         constraints.gridwidth = 1;
 215         constraints.gridheight = 1;
 216         constraints.weightx = constraints.weighty = 1.0;
 217         panel.add(emptyPanel, constraints);
 218
 219         return panel;
 220     }
 221
 222
 223     private JPanel constructTextPanel() {
 224         hostTextField = new JTextField();
 225         hostTextField.setPreferredSize(new Dimension(TEXTBOXWIDTH, TEXTBOXHEIGHT));
 226         hostTextField.setToolTipText(hostText);
 227         hostTextField.setBorder(new EtchedBorder());
 228
 229         //optionPanel.setBorder( new TitledBorder( new EtchedBorder(), "Document Format" ) );
 230         newsgroupComboBox = getNewsgroupCombo();
 231
 232         replyTextField = new JTextField();
 233         replyTextField.setPreferredSize(new Dimension(TEXTBOXWIDTH, TEXTBOXHEIGHT));
 234         replyTextField.setToolTipText(replyText);
 235         replyTextField.setBorder(new EtchedBorder());
 236
 237         subjectTextField = new JTextField();
 238         subjectTextField.setPreferredSize(new Dimension(TEXTBOXWIDTH, TEXTBOXHEIGHT));
 239         subjectTextField.setToolTipText(subjectText);
 240         subjectTextField.setBorder(new EtchedBorder());
 241
 242         commentTextArea = new JTextArea();
 243         commentTextArea.setPreferredSize(new Dimension(TEXTBOXWIDTH, TEXTAREAHEIGHT));
 244         commentTextArea.setToolTipText(commentText);
 245         commentTextArea.setBorder(new EtchedBorder());
 246
 247         JPanel panel = new JPanel();
 248         panel.setLayout(new GridBagLayout());
 249         GridBagConstraints constraints = new GridBagConstraints();
 250         constraints.fill = GridBagConstraints.BOTH;
 251         constraints.insets = new Insets(5, 5, 5, 5);
 252
 253         constraints.gridx = 0;
 254         constraints.gridy = 0;
 255         constraints.gridwidth = 1;
 256         constraints.gridheight = 1;
 257         panel.add(newsgroupComboBox, constraints);
 258
 259         constraints.gridx = 0;
 260         constraints.gridy = 1;
 261         constraints.gridwidth = 1;
 262         constraints.gridheight = 1;
 263         panel.add(hostTextField, constraints);
 264
 265         constraints.gridx = 0;
 266         constraints.gridy = 2;
 267         constraints.gridwidth = 1;
 268         constraints.gridheight = 1;
 269         panel.add(replyTextField, constraints);
 270
 271         constraints.gridx = 0;
 272         constraints.gridy = 3;
 273         constraints.gridwidth = 1;
 274         constraints.gridheight = 1;
 275         panel.add(subjectTextField, constraints);
 276
 277         constraints.gridx = 0;
 278         constraints.gridy = 4;
 279         constraints.gridwidth = 1;
 280         constraints.gridheight = 2;
 281         panel.add(commentTextArea, constraints);
 282
 283         return panel;
 284     }
 285
 286
 287     private JComboBox getNewsgroupCombo() {
 288         newsgroupComboBox = new JComboBox();
 289         //newsgroupComboBox.setBorder( new EtchedBorder() );
 290
 291         newsgroupComboBox.addActionListener(new ActionListener() {
 292             public void actionPerformed(ActionEvent e) {
 293                 // when newsgroup is selected
 294                 if (subscribedNewsgroups != null) {
 295                     int position = newsgroupComboBox.getSelectedIndex();
 296
 297                     if (position != -1) {
 298                         hostTextField.setText(subscribedNewsgroups[ position ].getHostName());
 299                         newsgroupComboBox.setToolTipText("Newsgroup name: " +
 300                                                          subscribedNewsgroups[ position ].getNewsgroupName() + "  (Host name: " +
 301                                                          subscribedNewsgroups[ position ].getHostName() + ")");
 302                     }
 303                 }
 304             }
 305         });
 306
 307         NewsGroup groupToSend = null;
 308         SubscribedNewsgroups newsgroups = new SubscribedNewsgroups();
 309         subscribedNewsgroups = newsgroups.getNewsGroups();
 310
 311         // Test for no .mozilla or no subscribed newsgroups
 312         // subscribedNewsgroups = null;
 313
 314         if (subscribedNewsgroups == null) {
 315             JOptionPane.showMessageDialog(window,
 316                                           "No subscribed newsgroups found in mozilla/netscape profile \nPlease enter newsgroup and host name",
 317                                           "Newsgroups Information", JOptionPane.INFORMATION_MESSAGE);
 318         } else {
 319             // Copy all newsgroups into a vector for comparison
 320             // Alter entries (to include host name) if duplication is found
 321             ArrayList vector = new ArrayList(subscribedNewsgroups.length);
 322
 323             for (int i = 0; i < subscribedNewsgroups.length; i++) {
 324                 vector.add(subscribedNewsgroups[i].getNewsgroupName());
 325             }
 326
 327             // Compare and alter
 328             for (int i = 0; i < subscribedNewsgroups.length; i++) {
 329                 // check if combo box already has a newsgroup with same name
 330                 // then add host name to differentiate
 331                 for (int j = 0; j < subscribedNewsgroups.length; j++) {
 332                     if (j != i
 333                         && subscribedNewsgroups[j].getNewsgroupName().equalsIgnoreCase(
 334                             subscribedNewsgroups[i].getNewsgroupName())) {
 335                         vector.set(j, subscribedNewsgroups[j].getNewsgroupName() + "  (" +
 336                                    subscribedNewsgroups[j].getHostName() + ")");
 337                         vector.set(i, subscribedNewsgroups[i].getNewsgroupName() + "  (" +
 338                                    subscribedNewsgroups[i].getHostName() + ")");
 339                     }
 340                 }
 341             }
 342
 343             // Copy converted newsgroups from vector to combo box
 344             for (int i = 0; i < subscribedNewsgroups.length; i++) {
 345                 newsgroupComboBox.addItem(vector.elementAt(i));
 346             }
 347         }// else
 348
 349         newsgroupComboBox.setPreferredSize(new Dimension(TEXTBOXWIDTH, TEXTBOXHEIGHT));
 350         newsgroupComboBox.setEditable(true);
 351
 352         return newsgroupComboBox;
 353     }
 354
 355
 356
 357     private JPanel constructOptionPanel() {
 358         officeHtmlButton = new JRadioButton("Office and HTML", true);
 359         officeHtmlButton.setToolTipText(officeHtmlText);
 360
 361         officeButton = new JRadioButton("Office");
 362         officeButton.setToolTipText(officeText);
 363
 364         htmlButton = new JRadioButton("HTML");
 365         htmlButton.setToolTipText(htmlText);
 366
 367         JRadioButton[] rbuttons = { officeHtmlButton, officeButton, htmlButton };
 368         ButtonGroup radioButtonGroup = new ButtonGroup();
 369
 370         for (int i = 0; i < rbuttons.length; i++) {
 371             radioButtonGroup.add(rbuttons[i]);
 372         }
 373
 374         JPanel optionPanel = new JPanel();
 375         optionPanel.setBorder(new TitledBorder(new EtchedBorder(), "Document Format"));
 376         optionPanel.setLayout(new GridBagLayout());
 377         GridBagConstraints constraints = new GridBagConstraints();
 378         constraints.fill = GridBagConstraints.BOTH;
 379
 380         constraints.gridx = 0;
 381         constraints.gridy = 0;
 382         constraints.gridwidth = 1;
 383         constraints.gridheight = 1;
 384         constraints.insets = new Insets(5, 5, 5, 30);
 385         optionPanel.add(officeHtmlButton, constraints);
 386
 387         constraints.gridx = 1;
 388         constraints.gridy = 0;
 389         constraints.gridwidth = 1;
 390         constraints.gridheight = 1;
 391         constraints.insets = new Insets(5, 20, 5, 30);
 392         optionPanel.add(officeButton, constraints);
 393
 394         constraints.gridx = 2;
 395         constraints.gridy = 0;
 396         constraints.gridwidth = 1;
 397         constraints.gridheight = 1;
 398         constraints.insets = new Insets(5, 20, 5, 5);
 399         optionPanel.add(htmlButton, constraints);
 400
 401         return optionPanel;
 402     }
 403
 404
 405
 406     public boolean sendingActions() {
 407         // posting actions
 408         // Validate the data
 409         if (isValidData()) {
 410             // Create status window
 411             StatusWindow statusWindow = new StatusWindow(window,  "Posting to Newsgroup",
 412                     FRAMEX, FRAMEY);
 413
 414             statusWindow.setVisible(true);
 415             statusLine = "Ready to send...";
 416             statusWindow.setStatus(0, statusLine);
 417
 418             // Get the boolean values for HTML/Office document
 419             // params: ( XScriptContext, StatusWindow, html document, office document )
 420
 421             boolean html = false;
 422             boolean office = false;
 423
 424             if (officeHtmlButton.isSelected()) {
 425                 html = true;
 426                 office = true;
 427             }
 428
 429             if (officeButton.isSelected()) {
 430                 office = true;
 431                 html = false;
 432             }
 433
 434             if (htmlButton.isSelected()) {
 435                 html = true;
 436                 office = false;
 437             }
 438
 439             OfficeAttachment officeAttach = new OfficeAttachment(xscriptcontext,
 440                     statusWindow, html, office);
 441
 442             statusLine = "Getting user input";
 443             statusWindow.setStatus(2, statusLine);
 444             // Get replyto, subject, comment from textboxes
 445             String replyto = replyTextField.getText();
 446             String subject = subjectTextField.getText();
 447             String comment = commentTextArea.getText();
 448
 449             // Get newsgroup from combo box (corresponding position)
 450             String host = "";
 451             String group = "";
 452             int position = newsgroupComboBox.getSelectedIndex();
 453
 454             if (subscribedNewsgroups == null || position == -1) {
 455                 host = hostTextField.getText();
 456                 group = newsgroupComboBox.getSelectedItem().toString();
 457             } else {
 458                 host = subscribedNewsgroups[ position ].getHostName();
 459                 group = subscribedNewsgroups[ position ].getNewsgroupName();
 460             }
 461
 462             statusLine = "Creating sender object";
 463             statusWindow.setStatus(3, statusLine);
 464             Sender sender = new Sender(statusWindow, officeAttach, replyto, subject,
 465                                        comment, host, group);
 466
 467             if (!sender.sendMail()) {
 468                 statusWindow.enableCancelButton(true);
 469                 officeAttach.cleanUpOnError();
 470                 return false;
 471             }
 472
 473             statusLine = "Send is complete";
 474             statusWindow.setStatus(14, statusLine);
 475         } else {
 476             return false;
 477         }
 478
 479         return true;
 480     }
 481
 482
 483     private JPanel constructButtonPanel() {
 484         Action postAction = new AbstractAction() {
 485             public void actionPerformed(ActionEvent event) {
 486                 // posting actions
 487                 sendingActions();
 488             }// actionPerformed
 489         };
 490
 491         Action cancelAction = new AbstractAction() {
 492             public void actionPerformed(ActionEvent event) {
 493                 // cancelling actions
 494                 window.dispose();
 495             }
 496         };
 497
 498         postButton = new JButton();
 499         postButton.setAction(postAction);
 500         postButton.setToolTipText(postText);
 501         postButton.setText("Post");
 502         postButton.setPreferredSize(new Dimension(BUTTONWIDTH + 20, BUTTONHEIGHT));
 503
 504         cancelButton = new JButton();
 505         cancelButton.setAction(cancelAction);
 506         cancelButton.setToolTipText(cancelText);
 507         cancelButton.setText("Cancel");
 508         cancelButton.setPreferredSize(new Dimension(BUTTONWIDTH + 20, BUTTONHEIGHT));
 509
 510         JSeparator sep = new JSeparator(SwingConstants.HORIZONTAL);
 511
 512         JPanel buttonPanel = new JPanel();
 513         buttonPanel.setLayout(new GridBagLayout());
 514         GridBagConstraints constraints = new GridBagConstraints();
 515         constraints.fill = GridBagConstraints.BOTH;
 516         constraints.insets = new Insets(5, 5, 5, 5);
 517
 518         JPanel emptyPanel1 = new JPanel();
 519         emptyPanel1.setPreferredSize(new Dimension(BUTTONWIDTH, BUTTONHEIGHT));
 520
 521         JPanel emptyPanel2 = new JPanel();
 522         emptyPanel2.setPreferredSize(new Dimension(BUTTONWIDTH, BUTTONHEIGHT));
 523
 524         constraints.gridx = 0;
 525         constraints.gridy = 0;
 526         constraints.gridwidth = 4;
 527         constraints.gridheight = 1;
 528         buttonPanel.add(sep, constraints);
 529
 530         constraints.gridx = 0;
 531         constraints.gridy = 1;
 532         constraints.gridwidth = 1;
 533         constraints.gridheight = 1;
 534         buttonPanel.add(emptyPanel1, constraints);
 535
 536         constraints.gridx = 1;
 537         constraints.gridy = 1;
 538         constraints.gridwidth = 1;
 539         constraints.gridheight = 1;
 540         buttonPanel.add(emptyPanel2, constraints);
 541
 542         constraints.gridx = 2;
 543         constraints.gridy = 1;
 544         constraints.gridwidth = 1;
 545         constraints.gridheight = 1;
 546         buttonPanel.add(postButton, constraints);
 547
 548         constraints.gridx = 3;
 549         constraints.gridy = 1;
 550         constraints.gridwidth = 1;
 551         constraints.gridheight = 1;
 552         constraints.insets = new Insets(5, 5, 5, 0);
 553         buttonPanel.add(cancelButton, constraints);
 554
 555         return buttonPanel;
 556     }
 557
 558
 559     public void enableButtons(boolean enable) {
 560         if (enable) {
 561             postButton.setEnabled(true);
 562             cancelButton.setEnabled(true);
 563         } else {
 564             postButton.setEnabled(false);
 565             cancelButton.setEnabled(false);
 566         }
 567     }
 568
 569
 570     private boolean isValidData() {
 571         // newsgroupComboBox must not be blank (format? dots and whitespace)
 572         String newsgroupString = "";
 573         int position = newsgroupComboBox.getSelectedIndex();
 574
 575         if (subscribedNewsgroups == null || position == -1) {
 576             newsgroupString = newsgroupComboBox.getSelectedItem().toString();
 577         } else {
 578             newsgroupString = subscribedNewsgroups[ position ].getNewsgroupName();
 579         }
 580
 581         if (newsgroupString.length() == 0) {
 582             newsgroupComboBox.requestFocus();
 583             JOptionPane.showMessageDialog(window, "Please enter a newsgroup name",
 584                                           "Input Error", JOptionPane.ERROR_MESSAGE);
 585             return false;
 586         }
 587
 588
 589         // hostTextField must not be blank (format?)
 590         String  hostString = hostTextField.getText();
 591
 592         if (hostString.length() == 0) {
 593             hostTextField.requestFocus();
 594             JOptionPane.showMessageDialog(window, "Please enter a hostname", "Input Error",
 595                                           JOptionPane.ERROR_MESSAGE);
 596             return false;
 597         }
 598
 599
 600         // replyTextField must have <string>@<string>.<string>
 601         // (string at least 2 chars long)
 602         // consider <s>.<s>@<s>.<s>.<s> format? (array of dot positions?)
 603         String replyString = replyTextField.getText();
 604         int atPos = replyString.indexOf("@");
 605         int dotPos = replyString.lastIndexOf(".");
 606         int length = replyString.length();
 607
 608         if (length == 0 || atPos == -1 || dotPos == -1 || atPos < 2 || dotPos < atPos
 609             || dotPos + 2 == length || atPos + 2 == dotPos
 610             || atPos != replyString.lastIndexOf("@") || replyString.indexOf(" ") != -1) {
 611             replyTextField.requestFocus();
 612             JOptionPane.showMessageDialog(window,
 613                                           "Please enter a valid reply to email address", "Input Error",
 614                                           JOptionPane.ERROR_MESSAGE);
 615             return false;
 616         }
 617
 618
 619         // subjectTextField must not be blank?
 620         String subjectString = subjectTextField.getText();
 621
 622         if (subjectString.length() == 0) {
 623             subjectTextField.requestFocus();
 624             JOptionPane.showMessageDialog(window, "Please enter subject title",
 625                                           "Input Error", JOptionPane.ERROR_MESSAGE);
 626             return false;
 627         }
 628
 629         // details are valid
 630         return true;
 631     }
 632
 633 }