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package com.jme3.gde.welcome.rss;
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/**
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*
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* @author Lars Vogel, normenhansen
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*/
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.util.List;
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import javax.swing.text.BadLocationException;
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import javax.swing.text.html.HTMLDocument;
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import javax.swing.text.html.HTMLEditorKit;
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import javax.xml.stream.XMLEventReader;
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import javax.xml.stream.XMLInputFactory;
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import javax.xml.stream.XMLStreamException;
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import javax.xml.stream.events.XMLEvent;
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import org.openide.util.Exceptions;
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public class RssFeedParser {
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static final String TITLE = "title";
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static final String DESCRIPTION = "description";
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static final String CHANNEL = "channel";
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static final String LANGUAGE = "language";
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static final String COPYRIGHT = "copyright";
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static final String LINK = "link";
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static final String AUTHOR = "author";
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static final String ITEM = "item";
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static final String PUB_DATE = "pubDate";
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static final String GUID = "guid";
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private final URL url;
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private final HTMLEditorKit ekit;
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private final HTMLDocument doc;
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public RssFeedParser(String feedUrl) {
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try {
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this.url = new URL(feedUrl);
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ekit = new HTMLEditorKit();
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doc = new HTMLDocument();
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public HTMLDocument getDocument() {
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return doc;
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}
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public HTMLEditorKit getEditorKit() {
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return ekit;
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}
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public void updateFeed() {
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Thread t = new Thread(new Runnable() {
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public void run() {
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try {
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final Feed feed = readFeed();
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java.awt.EventQueue.invokeLater(new Runnable() {
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public void run() {
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List<FeedMessage> msgs = feed.getMessages();
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try {
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doc.remove(0, doc.getLength());
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ekit.insertHTML(doc, doc.getLength(),
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"<html>"
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+ "<head>"
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+ "</head>"
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+ "<body>",
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0,
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0,
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null);
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// ekit.insertHTML(doc, doc.getLength(),
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// "<h1>"
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// + "Latest News"
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// + "</h1>",
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// 0,
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// 0,
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// null);
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for (FeedMessage feedMessage : msgs) {
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ekit.insertHTML(doc, doc.getLength(),
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"<h3><a href='"
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+ feedMessage.getLink()
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+ "'>"
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+ feedMessage.getTitle()
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+ "</a></h3>",
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0,
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0,
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null);
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// ekit.insertHTML(doc, doc.getLength(),
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// "<p>"
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// + feedMessage.getDescription()
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// + "</p>",
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// 0,
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// 0,
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// null);
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ekit.insertHTML(doc, doc.getLength(),
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"<br/>",
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0,
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0,
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null);
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}
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ekit.insertHTML(doc, doc.getLength(),
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"</body>"
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+ "</html>",
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0,
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0,
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null);
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doc.insertString(0, "", null);
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} catch (BadLocationException ex) {
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Exceptions.printStackTrace(ex);
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} catch (IOException ex) {
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Exceptions.printStackTrace(ex);
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}
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}
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});
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} catch (Exception ex) {
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Exceptions.printStackTrace(ex);
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}
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}
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});
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t.start();
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}
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@SuppressWarnings("null")
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public Feed readFeed() {
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Feed feed = null;
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try {
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boolean isFeedHeader = true;
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// Set header values intial to the empty string
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String description = "";
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String title = "";
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String link = "";
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String language = "";
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String copyright = "";
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String author = "";
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String pubdate = "";
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String guid = "";
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// First create a new XMLInputFactory
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XMLInputFactory inputFactory = XMLInputFactory.newInstance();
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// Setup a new eventReader
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InputStream in = read();
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XMLEventReader eventReader = inputFactory.createXMLEventReader(in);
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// Read the XML document
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while (eventReader.hasNext()) {
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XMLEvent event = eventReader.nextEvent();
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if (event.isStartElement()) {
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(ITEM)) {
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if (isFeedHeader) {
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isFeedHeader = false;
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feed = new Feed(title, link, description, language,
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copyright, pubdate);
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}
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event = eventReader.nextEvent();
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(TITLE)) {
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event = eventReader.nextEvent();
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title = event.asCharacters().getData();
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(DESCRIPTION)) {
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event = eventReader.nextEvent();
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if(event.getClass().getName().equals("com.ctc.wstx.evt.CompactStartElement")){
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description = event.asStartElement().asCharacters().getData();
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}else{
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description = event.asCharacters().getData();
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}
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(LINK)) {
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event = eventReader.nextEvent();
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//System.out.println("Teh hack: " + event.toString() + event.getClass());
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Object chars = event.asCharacters();
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if (chars instanceof javax.xml.stream.events.Characters) {
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javax.xml.stream.events.Characters jchars = (javax.xml.stream.events.Characters) chars;
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link = jchars.getData();
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} else {
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link = event.asCharacters().getData();
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}
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(GUID)) {
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event = eventReader.nextEvent();
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guid = event.asCharacters().getData();
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(LANGUAGE)) {
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event = eventReader.nextEvent();
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language = event.asCharacters().getData();
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(AUTHOR)) {
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event = eventReader.nextEvent();
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author = event.asCharacters().getData();
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(PUB_DATE)) {
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event = eventReader.nextEvent();
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pubdate = event.asCharacters().getData();
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continue;
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}
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if (event.asStartElement().getName().getLocalPart() != null && event.asStartElement().getName().getLocalPart().equals(COPYRIGHT)) {
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event = eventReader.nextEvent();
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copyright = event.asCharacters().getData();
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continue;
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}
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} else if (event.isEndElement()) {
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if (event.asEndElement().getName().getLocalPart() != null && event.asEndElement().getName().getLocalPart().equals(ITEM)) {
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FeedMessage message = new FeedMessage();
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message.setAuthor(author);
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message.setDescription(description);
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message.setGuid(guid);
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message.setLink(link);
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message.setTitle(title);
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feed.getMessages().add(message);
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event = eventReader.nextEvent();
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continue;
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}
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}
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}
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} catch (XMLStreamException e) {
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throw new RuntimeException(e);
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}
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return feed;
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}
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private InputStream read() {
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try {
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return url.openStream();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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}
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