package de.uhilger.wbx.web;
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import java.io.FileOutputStream;
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import javax.xml.stream.XMLEventFactory;
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import javax.xml.stream.XMLEventWriter;
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import javax.xml.stream.XMLOutputFactory;
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import javax.xml.stream.XMLStreamException;
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import javax.xml.stream.events.Characters;
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import javax.xml.stream.events.EndElement;
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import javax.xml.stream.events.StartDocument;
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import javax.xml.stream.events.StartElement;
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import javax.xml.stream.events.XMLEvent;
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import de.vogella.rss.model.Feed;
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import de.vogella.rss.model.FeedMessage;
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import java.io.OutputStream;
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public class FeedStreamWriter {
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//private String outputFile;
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private Feed rssfeed;
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private OutputStream out;
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public FeedStreamWriter(Feed rssfeed, OutputStream s) {
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this.rssfeed = rssfeed;
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this.out = s;
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}
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public void write() throws Exception {
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// create a XMLOutputFactory
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XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
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// create XMLEventWriter
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XMLEventWriter eventWriter = outputFactory
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.createXMLEventWriter(out);
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// create a EventFactory
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XMLEventFactory eventFactory = XMLEventFactory.newInstance();
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XMLEvent end = eventFactory.createDTD("\n");
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// create and write Start Tag
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StartDocument startDocument = eventFactory.createStartDocument();
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eventWriter.add(startDocument);
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// create open tag
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eventWriter.add(end);
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StartElement rssStart = eventFactory.createStartElement("", "", "rss");
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eventWriter.add(rssStart);
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eventWriter.add(eventFactory.createAttribute("version", "2.0"));
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eventWriter.add(end);
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eventWriter.add(eventFactory.createStartElement("", "", "channel"));
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eventWriter.add(end);
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// Write the different nodes
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createNode(eventWriter, "title", rssfeed.getTitle());
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createNode(eventWriter, "link", rssfeed.getLink());
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createNode(eventWriter, "description", rssfeed.getDescription());
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createNode(eventWriter, "language", rssfeed.getLanguage());
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createNode(eventWriter, "copyright", rssfeed.getCopyright());
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createNode(eventWriter, "pubdate", rssfeed.getPubDate());
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for (FeedMessage entry : rssfeed.getMessages()) {
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eventWriter.add(eventFactory.createStartElement("", "", "item"));
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eventWriter.add(end);
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createNode(eventWriter, "title", entry.getTitle());
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createNode(eventWriter, "description", entry.getDescription());
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createNode(eventWriter, "link", entry.getLink());
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createNode(eventWriter, "author", entry.getAuthor());
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createNode(eventWriter, "guid", entry.getGuid());
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eventWriter.add(end);
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eventWriter.add(eventFactory.createEndElement("", "", "item"));
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eventWriter.add(end);
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}
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eventWriter.add(end);
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eventWriter.add(eventFactory.createEndElement("", "", "channel"));
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eventWriter.add(end);
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eventWriter.add(eventFactory.createEndElement("", "", "rss"));
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eventWriter.add(end);
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eventWriter.add(eventFactory.createEndDocument());
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eventWriter.close();
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}
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private void createNode(XMLEventWriter eventWriter, String name,
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String value) throws XMLStreamException {
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XMLEventFactory eventFactory = XMLEventFactory.newInstance();
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XMLEvent end = eventFactory.createDTD("\n");
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XMLEvent tab = eventFactory.createDTD("\t");
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// create Start node
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StartElement sElement = eventFactory.createStartElement("", "", name);
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eventWriter.add(tab);
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eventWriter.add(sElement);
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// create Content
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Characters characters = eventFactory.createCharacters(value);
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eventWriter.add(characters);
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// create End node
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EndElement eElement = eventFactory.createEndElement("", "", name);
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eventWriter.add(eElement);
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eventWriter.add(end);
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}
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}
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