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1
19
20 package org.netbeans.modules.welcome.content;
21
22 import java.awt.Component  ;
23 import java.awt.Dimension ;
24 import java.awt.GridBagConstraints ;
25 import java.awt.GridBagLayout ;
26 import java.awt.Insets ;
27 import java.awt.Toolkit ;
28 import java.awt.event.ActionEvent ;
29 import java.awt.event.ActionListener ;
30 import java.beans.PropertyChangeEvent ;
31 import java.beans.PropertyChangeListener ;
32 import java.io.IOException ;
33 import java.net.SocketException ;
34 import java.net.UnknownHostException ;
35 import java.text.DateFormat ;
36 import java.text.ParseException ;
37 import java.text.SimpleDateFormat ;
38 import java.util.ArrayList ;
39 import java.util.Date ;
40 import java.util.Locale ;
41 import java.util.logging.Level ;
42 import java.util.logging.Logger ;
43 import javax.swing.JButton ;
44 import javax.swing.JComponent ;
45 import javax.swing.JLabel ;
46 import javax.swing.JPanel ;
47 import javax.swing.JScrollPane ;
48 import javax.swing.SwingUtilities ;
49 import javax.xml.parsers.ParserConfigurationException ;
50 import org.openide.ErrorManager;
51 import org.openide.awt.Mnemonics;
52 import org.openide.util.RequestProcessor;
53 import org.openide.util.WeakListeners;
54 import org.openide.xml.XMLUtil;
55 import org.w3c.dom.Node ;
56 import org.xml.sax.Attributes ;
57 import org.xml.sax.ContentHandler ;
58 import org.xml.sax.InputSource ;
59 import org.xml.sax.Locator ;
60 import org.xml.sax.SAXException ;
61 import org.xml.sax.XMLReader ;
62
63 public class RSSFeed extends JScrollPane implements Constants, PropertyChangeListener {
64
65 protected static final int NEWS_COUNT = 10;
66
67 private String url;
68
69 private boolean showProxyButton = true;
70
71 private RequestProcessor.Task reloadTimer;
72 private long lastReload = 0;
73
74 public static final String FEED_CONTENT_PROPERTY = "feedContent";
75
76 private static DateFormat parsingDateFormat = new SimpleDateFormat ( "EEE, dd MMM yyyy HH:mm:ss Z", Locale.ENGLISH ); private static DateFormat parsingDateFormatShort = new SimpleDateFormat ( "EEE, dd MMM yyyy", Locale.ENGLISH ); private static DateFormat printingDateFormat = DateFormat.getDateTimeInstance( DateFormat.SHORT, DateFormat.SHORT );
79 private static DateFormat printingDateFormatShort = DateFormat.getDateInstance( DateFormat.SHORT );
80
81 public RSSFeed( String url, boolean showProxyButton ) {
82 this.url = url;
83 this.showProxyButton = showProxyButton;
84 setBorder(null);
85 setOpaque(false);
86
87 setBackground( Utils.getColor(DEFAULT_BACKGROUND_COLOR) );
88 getViewport().setBackground( Utils.getColor(DEFAULT_BACKGROUND_COLOR) );
89 setViewportView( buildContentLoadingLabel() );
90
91 setHorizontalScrollBarPolicy( JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );
92
93 HttpProxySettings.getDefault().addPropertyChangeListener( WeakListeners.propertyChange( this, HttpProxySettings.getDefault() ) );
94 }
95
96 public RSSFeed( boolean showProxyButton ) {
97 this( null, showProxyButton );
98 }
99
100 public void setContent( Component content ) {
101 setViewportView( content );
102 firePropertyChange( FEED_CONTENT_PROPERTY, null, content );
103 }
104
105 public Component getContent() {
106 return getViewport().getView();
107 }
108
109 public void reload() {
110 new Reload().start();
111 }
112
113 protected ArrayList buildItemList() throws SAXException , ParserConfigurationException , IOException {
114 XMLReader reader = XMLUtil.createXMLReader( false, true );
115 FeedHandler handler = new FeedHandler();
116 reader.setContentHandler( handler );
117 reader.setEntityResolver( org.openide.xml.EntityCatalog.getDefault() );
118 reader.setErrorHandler( new ErrorCatcher() );
119
120 reader.parse( new InputSource (url) );
121
122 return handler.getItemList();
123 }
124
125
126 static class ErrorCatcher implements org.xml.sax.ErrorHandler {
127 private void message(Level level, org.xml.sax.SAXParseException e) {
128 Logger l = Logger.getLogger(RSSFeed.class.getName());
129 l.log(level, "Line number:"+e.getLineNumber()); l.log(level, "Column number:"+e.getColumnNumber()); l.log(level, "Public ID:"+e.getPublicId()); l.log(level, "System ID:"+e.getSystemId()); l.log(level, "Error message:"+e.getMessage()); }
135
136 public void error(org.xml.sax.SAXParseException e) {
137 message(Level.SEVERE, e); }
139
140 public void warning(org.xml.sax.SAXParseException e) {
141 message(Level.WARNING,e); }
143
144 public void fatalError(org.xml.sax.SAXParseException e) {
145 message(Level.SEVERE,e); }
147 }
149 private class Reload extends Thread {
150 public void run() {
151 try {
152 lastReload = System.currentTimeMillis();
153
154 ArrayList itemList = buildItemList();
155 final JPanel contentPanel = new NoHorizontalScrollPanel();
156 contentPanel.setOpaque( false );
157 int contentRow = 0;
158
159 Component header = getContentHeader();
160 if( null != header ) {
161 contentPanel.add( header, new GridBagConstraints (0,contentRow++,1,1,0.0,0.0,
162 GridBagConstraints.CENTER,GridBagConstraints.BOTH,
163 new Insets (0,0,0,0),0,0 ) );
164 }
165
166 for( int i=0; i<Math.min(itemList.size(), NEWS_COUNT); i++ ) {
167 FeedItem item = (FeedItem)itemList.get(i);
168
169 if( null != item.title && null != item.link ) {
170 JPanel panel = new JPanel ( new GridBagLayout () );
171 panel.setOpaque( false );
172 int row = 0;
173 if( item.dateTime != null) {
174 JLabel label = new JLabel ();
175 label.setFont( RSS_DESCRIPTION_FONT );
176 label.setForeground( Utils.getColor(RSS_DATETIME_COLOR) );
177 label.setText( formatDateTime( item.dateTime ) );
178 panel.add( label, new GridBagConstraints (0,row++,1,1,0.0,0.0,
179 GridBagConstraints.WEST,GridBagConstraints.NONE,
180 new Insets (0,TEXT_INSETS_LEFT+5,2,TEXT_INSETS_RIGHT),0,0 ) );
181 }
182
183 WebLink linkButton = new WebLink( item.title, item.link, true );
184 linkButton.getAccessibleContext().setAccessibleName(
185 BundleSupport.getAccessibilityName( "WebLink", item.title ) ); linkButton.getAccessibleContext().setAccessibleDescription(
187 BundleSupport.getAccessibilityDescription( "WebLink", item.link ) ); linkButton.setFont( HEADER_FONT );
189 panel.add( linkButton, new GridBagConstraints (0,row++,1,1,1.0,1.0,
190 GridBagConstraints.WEST,GridBagConstraints.NONE,
191 new Insets (0,5,2,TEXT_INSETS_RIGHT),0,0 ) );
192
193
194 if (item.description != null) {
195 JLabel label = new JLabel ();
196 label.setFont( RSS_DESCRIPTION_FONT );
197 label.setText( "<html>"+trimHtml( item.description ) ); panel.add( label, new GridBagConstraints (0,row++,1,1,1.0,1.0,
199 GridBagConstraints.WEST,GridBagConstraints.BOTH,
200 new Insets (0,TEXT_INSETS_LEFT+5,0,TEXT_INSETS_RIGHT),0,0 ) );
201 }
202
203 contentPanel.add( panel, new GridBagConstraints (0,contentRow++,1,1,1.0,1.0,
204 GridBagConstraints.NORTHWEST,GridBagConstraints.BOTH,
205 new Insets (contentRow==1 ? UNDER_HEADER_MARGIN : 0,0,16,0),0,0 ) );
206 }
207 }
208
209 SwingUtilities.invokeLater( new Runnable () {
210 public void run() {
211 setContent( contentPanel );
212 }
213 });
214
215 reloadTimer = RequestProcessor.getDefault().post( this, RSS_FEED_TIMER_RELOAD_MILLIS );
217
218 } catch( UnknownHostException uhE ) {
219 SwingUtilities.invokeLater( new Runnable () {
220 public void run() {
221 setContent( buildProxyPanel() );
222 }
223 });
224 } catch( SocketException sE ) {
225 SwingUtilities.invokeLater( new Runnable () {
226 public void run() {
227 setContent( buildProxyPanel() );
228 }
229 });
230 } catch( IOException ioE ) {
231 SwingUtilities.invokeLater( new Runnable () {
232 public void run() {
233 setContent( buildProxyPanel() );
234 }
235 });
236 } catch( Exception e ) {
237 SwingUtilities.invokeLater( new Runnable () {
238 public void run() {
239 setContent( buildErrorLabel() );
240 }
241 });
242 ErrorManager.getDefault().notify( ErrorManager.INFORMATIONAL, e );
243 }
244 }
245 }
246
247 protected static String getTextContent(Node node) {
248 Node child = node.getFirstChild();
249 if( null == child )
250 return null;
251
252 return child.getNodeValue();
253 }
254
255 protected String formatDateTime( String strDateTime ) {
256 try {
257 Date date = parsingDateFormat.parse( strDateTime );
258 return printingDateFormat.format( date );
259 } catch( NumberFormatException nfE ) {
260 } catch( ParseException pE ) {
262 try {
263 Date date = parsingDateFormatShort.parse( strDateTime );
264 return printingDateFormatShort.format( date );
265 } catch( NumberFormatException nfE ) {
266 } catch( ParseException otherPE ) {
268 }
270 }
271 return strDateTime;
272 }
273
274 private static final long serialVersionUID = 1L;
275
276 public Dimension getPreferredSize() {
277 Dimension retValue = super.getPreferredSize();
278 retValue.width = 1;
279 retValue.height = 1;
280 return retValue;
281 }
282
283 public void removeNotify() {
284 if( null != reloadTimer ) {
286 reloadTimer.cancel();
287 reloadTimer = null;
288 }
289 super.removeNotify();
290 }
291
292 public void addNotify() {
293 super.addNotify();
294 if( null == reloadTimer && !Boolean.getBoolean("netbeans.full.hack")) {
295 if( System.currentTimeMillis() - lastReload >= RSS_FEED_TIMER_RELOAD_MILLIS ) {
296 reload();
297 } else {
298 reloadTimer = RequestProcessor.getDefault().post( new Reload(),
299 (int)(RSS_FEED_TIMER_RELOAD_MILLIS - (System.currentTimeMillis() - lastReload)) );
300 }
301 }
302 }
303
304 private String trimHtml( String htmlSnippet ) {
305 String res = htmlSnippet.replaceAll( "<[^>]*>", "" ); res = res.replaceAll( " ", " " ); res = res.trim();
308 int maxLen = getMaxDecsriptionLength();
309 if( res.length() > maxLen ) {
310 res = res.substring( 0, maxLen ) + "..."; }
312 return res;
313 }
314
315 protected int getMaxDecsriptionLength() {
316 int verticalSize = Toolkit.getDefaultToolkit().getScreenSize().height;
317 if( verticalSize >= 1200 )
318 return 350;
319 if( verticalSize >= 1024 )
320 return 220;
321 return 140;
322 }
323
324 protected Component getContentHeader() {
325 return null;
326 }
327
328 private JComponent buildProxyPanel() {
329 Component header = getContentHeader();
330 JPanel panel = null == header ? new JPanel (new GridBagLayout ()) : new NoHorizontalScrollPanel();
331 panel.setOpaque( false );
332
333 int row = 0;
334 if( null != header ) {
335 panel.add( header, new GridBagConstraints (0,row++,1,1,1.0,0.0,
336 GridBagConstraints.CENTER,GridBagConstraints.BOTH,new Insets (0,0,0,0),0,0 ) );
337 }
338
339 panel.add( new JLabel (BundleSupport.getLabel("ErrCannotConnect")), new GridBagConstraints (0,row++,1,1,0.0,0.0,
341 GridBagConstraints.CENTER,GridBagConstraints.NONE,new Insets (5,10,10,5),0,0 ) );
342 if( showProxyButton ) {
343 JButton button = new JButton ();
344 Mnemonics.setLocalizedText( button, BundleSupport.getLabel( "ProxyConfig" ) ); button.setOpaque( false );
346 button.addActionListener( new ActionListener () {
347 public void actionPerformed(ActionEvent e) {
348 HttpProxySettings.getDefault().showConfigurationDialog();
349 }
350 });
351 panel.add( button, new GridBagConstraints (0,row++,1,1,0.0,0.0,
352 GridBagConstraints.CENTER,GridBagConstraints.NONE,new Insets (5,10,10,5),0,0 ) );
353 }
354 return panel;
355 }
356
357 private JComponent buildContentLoadingLabel() {
358 JLabel label = new JLabel ( BundleSupport.getLabel( "ContentLoading" ) ); label.setHorizontalAlignment( JLabel.CENTER );
360 label.setVerticalAlignment( JLabel.CENTER );
361 label.setForeground( Utils.getColor(DEFAULT_TEXT_COLOR) );
362 label.setBackground( Utils.getColor(DEFAULT_BACKGROUND_COLOR) );
363 label.setOpaque( false );
364 Component header = getContentHeader();
365 if( null != header ) {
366 JPanel panel = new NoHorizontalScrollPanel();
367 panel.setOpaque( false );
368 panel.add( header, new GridBagConstraints (0,0,1,1,1.0,1.0,
369 GridBagConstraints.CENTER,GridBagConstraints.BOTH,new Insets (0,0,0,0),0,0 ) );
370 panel.add( label, new GridBagConstraints (0,1,1,1,1.0,1.0,
371 GridBagConstraints.CENTER,GridBagConstraints.BOTH,new Insets (0,0,0,0),0,0 ) );
372 return panel;
373 }
374 return label;
375 }
376
377 private JComponent buildErrorLabel() {
378 Component header = getContentHeader();
379 JPanel panel = null == header ? new JPanel (new GridBagLayout ()) : new NoHorizontalScrollPanel();
380 panel.setOpaque( false );
381
382 int row = 0;
383 if( null != header ) {
384 panel.add( header, new GridBagConstraints (0,row++,1,1,1.0,0.0,
385 GridBagConstraints.CENTER,GridBagConstraints.BOTH,new Insets (0,0,0,0),0,0 ) );
386 }
387
388 panel.add( new JLabel (BundleSupport.getLabel("ErrLoadingFeed")), new GridBagConstraints (0,row++,1,1,0.0,0.0,
390 GridBagConstraints.CENTER,GridBagConstraints.NONE,new Insets (5,10,10,5),0,0 ) );
391 JButton button = new JButton ();
392 Mnemonics.setLocalizedText( button, BundleSupport.getLabel( "Reload" ) ); button.setOpaque( false );
394 button.addActionListener( new ActionListener () {
395 public void actionPerformed(ActionEvent e) {
396 reload();
397 }
398 });
399 panel.add( button, new GridBagConstraints (0,row++,1,1,0.0,0.0,
400 GridBagConstraints.CENTER,GridBagConstraints.NONE,new Insets (5,10,10,5),0,0 ) );
401 return panel;
402 }
403
404 public void propertyChange(PropertyChangeEvent evt) {
405 if( HttpProxySettings.PROXY_SETTINGS.equals( evt.getPropertyName() ) ) {
406 setViewportView( buildContentLoadingLabel() );
407 reload();
408 }
409 }
410
411 static class FeedHandler implements ContentHandler {
412 private FeedItem currentItem;
413 private StringBuffer textBuffer;
414 private ArrayList <FeedItem> itemList = new ArrayList <FeedItem>( 10 );
415
416 public void setDocumentLocator(Locator locator) {
417 }
418
419 public void startDocument() throws SAXException {
420 }
421
422 public void endDocument() throws SAXException {
423 }
424
425 public void startPrefixMapping(String prefix, String uri) throws SAXException {
426 }
427
428 public void endPrefixMapping(String prefix) throws SAXException {
429 }
430
431 public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
432 if( itemList.size() < NEWS_COUNT ) {
433 if( "item".equals( localName ) ) { currentItem = new FeedItem();
435 } else if( "link".equals( localName ) || "pubDate".equals( localName ) || "date".equals( localName ) || "description".equals( localName ) || "title".equals( localName ) ) { textBuffer = new StringBuffer ( 110 );
441 }
442 }
443 }
444
445 public void endElement(String uri, String localName, String qName) throws SAXException {
446 if( itemList.size() < NEWS_COUNT ) {
447 if( "item".equals( localName ) ) { if( null != currentItem && currentItem.isValid() ) {
449 itemList.add( currentItem );
450 }
451 currentItem = null;
452 } else if( null != currentItem && null != textBuffer ) {
453 String text = textBuffer.toString().trim();
454 textBuffer = null;
455 if( 0 == text.length() )
456 text = null;
457
458 if( "link".equals( localName ) ) { currentItem.link = text;
460 } else if( "pubDate".equals( localName ) || "date".equals( localName ) ) { currentItem.dateTime = text;
463 } else if( "title".equals( localName ) ) { currentItem.title = text;
465 } else if( "description".equals( localName ) ) { currentItem.description = text;
467 }
468 }
469 }
470 }
471
472 public void characters(char[] ch, int start, int length) throws SAXException {
473 if( null != textBuffer )
474 textBuffer.append( ch, start, length );
475 }
476
477 public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
478 }
479
480 public void processingInstruction(String target, String data) throws SAXException {
481 }
482
483 public void skippedEntity(String name) throws SAXException {
484 }
485
486 public ArrayList <FeedItem> getItemList() {
487 return itemList;
488 }
489 }
490
491 static class FeedItem {
492 String title;
493 String link;
494 String description;
495 String dateTime;
496
497 boolean isValid() {
498 return null != title && null != link;
499 }
500 }
501 }
502 |
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