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Migration from Apache Abdera to Apache Wink

TBD

This section contains the following Topics:

1 - Consuming Atom Documents

TBD

Apache Abdera

Apache Wink

Abdera abdera = new Abdera();
Parser parser = abdera.getParser();
URL url = new URL("http://alexharden.org/blog/atom.xml");
Document<Feed> doc = parser.parse(url.openStream());
Feed feed = doc.getRoot();
System.out.println(feed.getTitle());
for (Entry entry : feed.getEntries()) {
    System.out.println("\t" + entry.getTitle());
}
RestClient client = new RestClient();
Resource resource = client.resource("http://alexharden.org/blog/atom.xml");
AtomFeed feed = resource.accept(MediaType.APPLICATION_ATOM_XML).get(AtomFeed.class);
System.out.println(feed.getTitle().getValue());
for (AtomEntry entry : feed.getEntries()) {
    System.out.println("\t" + entry.getTitle().getValue());
}

ConsumeAtomUsingAbdera.java

ConsumeAtomUsingWink.java

2a - Producing Atom Documents

TBD

Apache Abdera

Apache Wink

protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    Abdera abdera = new Abdera();
    Feed feed = abdera.newFeed();

    feed.setId("tag:example.org,2007:/foo");
    feed.setTitle("Test Feed");
    feed.setSubtitle("Feed subtitle");
    feed.setUpdated(new Date());
    feed.addAuthor("Shiva HR");
    feed.addLink("http://example.com");
    feed.addLink("http://example.com/foo", "self");

    Entry entry = feed.addEntry();
    entry.setId("tag:example.org,2007:/foo/entries/1");
    entry.setTitle("Entry title");
    entry.setSummaryAsHtml("<p>This is the entry title</p>");
    entry.setUpdated(new Date());
    entry.setPublished(new Date());
    entry.addLink("http://example.com/foo/entries/1");

    feed.getDocument().writeTo(response.getWriter());
} 
protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    AtomFeed feed = new AtomFeed();
    feed.setId("tag:example.org,2007:/foo");
    feed.setTitle(new AtomText("Test Feed"));
    feed.setSubtitle(new AtomText("Feed subtitle"));
    feed.setUpdated(new Date());

    AtomPerson person = new AtomPerson();
    person.setName("Shiva HR");
    feed.getAuthors().add(person);

    AtomLink link1 = new AtomLink();
    link1.setHref("http://example.com");
    feed.getLinks().add(link1);

    AtomLink link2 = new AtomLink();
    link2.setHref("http://example.com/foo");
    link2.setRel("self");
    feed.getLinks().add(link2);

    AtomEntry entry = new AtomEntry();
    entry.setId("tag:example.org,2007:/foo/entries/1");
    entry.setTitle(new AtomText("Entry title"));

    AtomText summary = new AtomText();
    summary.setType(AtomTextType.html);
    summary.setValue("<p>This is the entry title</p>");
    entry.setSummary(summary);

    entry.setUpdated(new Date());
    entry.setPublished(new Date());

    AtomLink link3 = new AtomLink();
    link3.setHref("http://example.com/foo/entries/1");
    entry.getLinks().add(link3);

    feed.getEntries().add(entry);

    AtomFeed.marshal(feed, response.getOutputStream());
}

ProduceAtomUsingAbdera.java ProduceAtomUsingAbdera_web.xml

ProduceAtomUsingWink.java ProduceAtomUsingWink_web.xml

2b - Producing Atom Documents Using Apache Wink

TBD

The JAX-RS Way

  • Inside Eclipse: Create a Dynamic Web Project.
  • Add Wink & its dependent JARs into Java Build Path and Java EE Module Dependencies.
  • Create a POJO class and a method that creates Atom feed document. Annotate the class & its methods with required JAX-RS annotations as below:
    ProduceAtom.java
  • Add org.apache.wink.server.internal.servlet.RestServlet into web.xml and specify the path of above Resource class in it's init-param.
    See ProduceAtomWinkElegant_web.xml and application
  • Deploy the web-application and access it using the url http://localhost:8080/ProduceAtom_Wink_Elegant/rest/getAtom

Final WAR -> ProduceAtom_Wink_Elegant.zip (add Wink & its dependent JARs under ProduceAtom_Wink_Elegant\WEB-INF\lib and re-zip it as WAR).

3 - Consuming RSS Documents

TBD

Apache Abdera

Apache Wink

public static void main(String[] args) throws ParseException, IOException {
    System.out.println("Consuming RSS Documents using Abdera...\n");
    Abdera abdera = new Abdera();
    Parser parser = abdera.getParser();
    URL url = new URL("http://www.rssboard.org/files/sample-rss-2.xml");
    Document<RssFeed> doc = parser.parse(url.openStream());
    RssFeed rssFeed = doc.getRoot();
    System.out.println("Title: " + rssFeed.getTitle());
    System.out.println("Description: " + rssFeed.getSubtitle() + "\n");
    int itemCount = 0;
    for (Entry entry : rssFeed.getEntries()) {
        System.out.println("Item " + ++itemCount + ":");
        System.out.println("\tTitle: " + entry.getTitle());
        System.out.println("\tPublish Date: " + entry.getPublished());
        System.out.println("\tDescription: " + entry.getContent());
    }
} 
public static void main(String[] args) {
    System.out.println("Consuming RSS Documents using Apache Wink...\n");
    RestClient client = new RestClient();
    String url = "http://www.rssboard.org/files/sample-rss-2.xml";
    Resource resource = client.resource(url);
    RssFeed rss = resource.accept(MediaType.APPLICATION_XML).get(RssFeed.class);
    RssChannel channel = rss.getChannel();
    System.out.println("Title: " + channel.getTitle());
    System.out.println("Description: " + channel.getDescription() + "\n");
    int itemCount = 0;
    for (RssItem item : channel.getItems()) {
        System.out.println("Item " + ++itemCount + ":");
        System.out.println("\tTitle: " + item.getTitle());
        System.out.println("\tPublish Date: " + item.getPubDate());
        System.out.println("\tDescription: " + item.getDescription());
    }
}

ConsumeRssUsingAbdera.java

ConsumeRssUsingWink.java

4 - Creating RSS Documents

TBD

Apache Abdera

Apache Wink

As of v0.4 Abdera has no support for RSS write.

Same as in 2)a) or 2)b). The resource method now returns an RssFeed object instead of AtomFeed object.

@Path("/getRss")
public class ProduceRss {
    @GET
    @Produces(MediaType.APPLICATION_XML)
    public Rss getRss() {
        RssFeed rss = new RssFeed();

        RssChannel channel = new RssChannel();
        channel.setTitle("Liftoff News");
        channel.setLink("http://liftoff.msfc.nasa.gov");
        channel.setDescription("Liftoff to Space Exploration.");
        channel.setPubDate(new Date().toString());

        RssItem item = new RssItem();
        item.setTitle("Star City");
        item.setLink("http://liftoff.msfc.nasa.gov/news/2003/news-starcity.asp");
        item.setDescription("How do Americans get ready to work with Russians aboard the International Space Station?");

        channel.getItem().add(item);
        rss.setChannel(channel);
        return rss;
    }

} 

 

ProduceRss_Wink_Elegant.zip

5 - Writing Atom Publishing Protocol (APP) Server

TBD

6 - Writing Atom Publishing Protocol (APP) Client

TBD

7 - Object Models Comparison for Atom Syndication Format (ASF)

TBD

8 - Object Models Comparison for Atom Publishing Protocol (APP)

TBD

9 - Object Models Comparison for RSS (Really Simple Syndication)

TBD

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