Migration from Apache Abdera to Apache Wink
TBD
1) Consuming Atom Documents:
Apache Wink is the perfect solution for consuming and producing Atom, APP and RSS documents. The following section describes how to migrate from Apache Abdera to Apache Wink by providing a set of examples that cover most use cases.
Advantages of Apache Wink over Apache Abdera
- Standardized APIs (using JAX-RS and JAXB)
- Support for handling XML and JSON more easily
- Support for handling RSS and ATOM more easily
This section contains the following topics:
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1) Consuming Atom Documents
The following code example demonstrates the consumption of Atom documents using Apache Abdera.
Apache Abdera - Click on link to Download - ConsumeAtomUsingAbdera.java |
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Abdera abdera = new Abdera();
Parser parser = abdera.getParser();
URL url = new URL |
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Apache Abdera
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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());
}
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RestClient client = new RestClient();
Resource resource = client.resource("http://alexharden.org/blog/atom.xml");
AtomFeedDocument<Feed> feeddoc = resourceparser.acceptparse(MediaType.APPLICATION_ATOM_XML).get(AtomFeed.classurl.openStream());
Feed feed = doc.getRoot();
System.out.println(feed.getTitle().getValue());
for (AtomEntryEntry entry : feed.getEntries()) {
System.out.println("\t" + entry.getTitle().getValue());
}
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The following code example demonstrates the consumption of Atom documents using Apache Wink.
2) a) Producing Atom Documents:
Apache Abdera | Apache Wink |
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protectedRestClient voidclient doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Abdera abdera = new Abdera();
Feed= new RestClient();
Resource resource = client.resource("http://alexharden.org/blog/atom.xml");
AtomFeed feed = abderaresource.newFeed();
feed.setId("tag:example.org,2007:/foo");
feed.setTitle("Test Feed");accept(MediaType.APPLICATION_ATOM_XML).get(AtomFeed.class);
System.out.println(feed.getTitle().getValue());
for (AtomEntry entry : feed.getEntries()) {
feedSystem.out.setSubtitleprintln("Feed subtitle");
feed.setUpdated(new Date\t" + entry.getTitle().getValue());
}
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2) a) Producing Atom Documents
The following code example demonstrates the production of Atom documents using Apache Abdera.
Apache Abdera - Click on links to Download - ProduceAtomUsingAbdera.java ProduceAtomUsingAbdera_web.xml |
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
feed.addAuthor("Shiva HR");
feed.addLink("http://example.com");
feed.addLink("http://example.com/foo", "self");
EntryAbdera entryabdera = new Abdera();
Feed feed = abdera.addEntrynewFeed();
entryfeed.setId("tag:example.org,2007:/foo/entries/1");
entryfeed.setTitle("EntryTest titleFeed");
entryfeed.setSummaryAsHtmlsetSubtitle("<p>This is the entry title</p>"Feed subtitle");
entryfeed.setUpdated(new Date());
entryfeed.setPublishedaddAuthor(new Date()"Shiva HR");
entryfeed.addLink("http://example.com/foo/entries/1");
feed.getDocument().writeTo(response.getWriter());
} | Code Block |
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
AtomFeed feed = new AtomFeedaddLink("http://example.com/foo", "self");
Entry entry = feed.addEntry();
feedentry.setId("tag:example.org,2007:/foo/entries/1");
feedentry.setTitle(new"Entry AtomText("Test Feed")title");
feedentry.setSubtitle(new AtomText("Feed subtitle"))setSummaryAsHtml("<p>This is the entry title</p>");
feedentry.setUpdated(new Date());
AtomPerson person = entry.setPublished(new AtomPersonDate());
personentry.setNameaddLink("Shiva HRhttp://example.com/foo/entries/1");
feed.getAuthorsgetDocument().writeTo(response.addgetWriter(person));
} |
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The following code example demonstrates the production of Atom documents using Apache Wink.
Apache Wink - Click on links to Download - ProduceAtomUsingWink.java ProduceAtomUsingWink_web.xml |
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protected void doGet(HttpServletRequest request, AtomLink link1 HttpServletResponse response)
throws ServletException, IOException {
AtomFeed feed = new AtomLinkAtomFeed();
link1feed.setHrefsetId("httptag://example.comorg,2007:/foo");
feed.getLinks().add(link1setTitle(new AtomText("Test Feed"));
AtomLink link2 = new AtomLink();
link2.setHref("http://example.com/foo"feed.setSubtitle(new AtomText("Feed subtitle"));
feed.setUpdated(new Date());
AtomPerson person = new AtomPerson();
link2person.setRelsetName("selfShiva HR");
feed.getLinksgetAuthors().add(link2person);
AtomEntryAtomLink entrylink1 = new AtomEntryAtomLink();
entrylink1.setIdsetHref("taghttp://example.org,2007:/foo/entries/1com");
entryfeed.setTitle(new AtomText("Entry title")getLinks().add(link1);
AtomTextAtomLink summarylink2 = new AtomTextAtomLink();
summarylink2.setType(AtomTextType.htmlsetHref("http://example.com/foo");
summarylink2.setValuesetRel("<p>This is the entry title</p>self");
entry.setSummary(summaryfeed.getLinks().add(link2);
AtomEntry entry.setUpdated( = new DateAtomEntry());
entry.setPublished(new Date());
setId("tag:example.org,2007:/foo/entries/1");
AtomLink link3 = entry.setTitle(new AtomLinkAtomText("Entry title"));
AtomText summary link3.setHref("http://example.com/foo/entries/1"= new AtomText();
entrysummary.getLinkssetType()AtomTextType.add(link3html);
feedsummary.getEntries().add(entrysetValue("<p>This is the entry title</p>");
entry.setSummary(summary);
AtomFeed.marshal(feed, response.getOutputStreamentry.setUpdated(new Date());
entry.setPublished(new Date());
}
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ProduceAtomUsingAbdera.java ProduceAtomUsingAbdera_web.xml | ProduceAtomUsingWink.java ProduceAtomUsingWink_web.xml |
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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());
}
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2) b) Producing Atom Documents - the JAX-RS way
A more elegant way of producing Atom documents using Apache Wink
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is the JAX-RS way
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as described below:
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- Open the Eclipse development environment and create a "Dynamic Web Project".
- Add Apache Wink & its dependent JARs
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- under Java
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- EE Module Dependencies.
- Create a POJO class and a method that creates Atom feed document. Annotate the class & its methods with the 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).
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The following code example demonstrates the consuming of RSS documents using Apache Abdera.
Apache Wink Abdera - Click on link to Download - ConsumeRssUsingAbdera.java |
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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 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());
}
} |
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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());
}
}
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ConsumeRssUsingAbdera.java | ConsumeRssUsingWink.java |
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Apache Abdera
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Apache Wink
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As of v0.4 Abdera has no support for RSS write.
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Same as in 2)a) or 2)b). The resource method now returns an RssFeed object instead of AtomFeed object.
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@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;
}
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ProduceRss_Wink_Elegant.zip
5) Writing Atom Publishing Protocol (APP) Server:
6) Writing Atom Publishing Protocol (APP) Client:
7) Comparison of Object Models for Atom Syndication Format (ASF)
8) Comparison of Object Models for Atom Publishing Protocol (APP)
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= 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());
}
} |
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The following code example demonstrates the consuming of RSS documents using Apache Wink.
Apache Wink - Click on link to Download - ConsumeRssUsingWink.java |
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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());
}
}
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Apache Abdera
Apache Abdera version 0.4 does not support RSS write.
Apache Wink
Same as in 2) b) Producing Atom Documents - the JAX-RS way. However the resource method now returns an RssFeed object instead of AtomFeed object.
Apache Wink - Click on link to Download - ProduceRss_Wink_Elegant.zip |
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@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;
}
}
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5) Writing Atom Publishing Protocol (APP) Server
The following steps explain how to implement an APP server as described in the following beautiful article by James Snell: http://www.ibm.com/developerworks/library/x-atompp1/
Apache Abdera
- Open the Eclipse development environment and create a "Dynamic Web Project".
- Add Apache Abdera & its dependent JARs under Java EE Module Dependencies.
- Add the following CollectionAdapter and Provider classes under src/myPackage directory: APP_CollectionAdapter.java APP_ContentProvider.java
- Add org.apache.abdera.protocol.server.servlet.AbderaServlet into web.xml and point the following init paramters to the classes added above.
org.apache.abdera.protocol.server.Provider
org.apache.abdera.protocol.server.CollectionAdapter
APP_Server_Abdera_web.xml - Add the following index.jsp which has help on how to perform the APP operations: APP_Server_Abdera_index.jsp
- Deploy and run the application.
Final WAR -> APP_Server_Abdera.zip (add Apache Abdera & its dependent JARs under APP_Server_Abdera\WEB-INF\lib and re-zip it as WAR).
Apache Wink
- Open the Eclipse development environment and create a "Dynamic Web Project".
- Add Apache Wink & its dependent JARs under Java EE Module Dependencies.
- Add the following Resource class under src/myPackage directory: EntriesCollection.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. APP_Server_Wink_web.xml APP_Server_Wink_application
- Add the following index.jsp which has help on how to perform the APP operations: APP_Server_Wink_index.jsp
- Deploy and run the application.
Final WAR -> APP_Server_Wink.zip (add Apache Wink & its dependent JARs under APP_Server_Wink\WEB-INF\lib and re-zip it as WAR)
References
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6) Writing Atom Publishing Protocol (APP) Client
In order to write an Atom Publishing Protocol client refer to the following examples.
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Make sure that the APP_Server_Abdera.war and the APP_Server_Wink.war provided in the previous example are deployed before running these examples. |
Apache Abdera - Click on link to Download - APP_Client_Abdera.java
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1. Acessing Service Document:
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Document<Service> introspection = abderaClient.get(SERVICE_URL).getDocument();
Service service = introspection.getRoot();
List<Workspace> workspaces = service.getWorkspaces();
for (Workspace workspace : workspaces) {
System.out.println("\t" + workspace.getTitle());
List<Collection> collections = workspace.getCollections();
for (Collection collection : collections) {
System.out.println("\t" + collection.getTitle() + "\t:\t" + collection.getHref());
}
System.out.print("\n");
}
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2. Getting a Feed Code Block |
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RequestOptions opts = new RequestOptions();
opts.setContentType("application/atom+xml;type=feed");
ClientResponse response = abderaClient.get(FEED_URL, opts);
Feed feed = (Feed)response.getDocument().getRoot();
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3. Posting an entry to a Feed
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RequestOptions opts = new RequestOptions();
opts.setContentType("application/atom+xml;type=entry");
ClientResponse response = abderaClient.post(FEED_URL, newEntry, opts);
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4. Putting a change to an Entry
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RequestOptions opts = new RequestOptions();
opts.setContentType("application/atom+xml;type=entry");
ClientResponse response = abderaClient.put(ENTRY_URL, changedEntry.getDocument(), opts);
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5. Getting an Entry
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RequestOptions opts = new RequestOptions();
opts.setContentType("application/atom+xml;type=entry");
ClientResponse response = abderaClient.get(ENTRY_URL, opts);
Entry entry = (Entry)response.getDocument().getRoot();
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6. Deleting an Entry
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ClientResponse response = abderaClient.delete(ENTRY_URL);
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Apache Wink - Click on link to Download - APP_Client_Wink.java
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1. Acessing Service Document:
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Resource resource = restClient.resource(SERVICE_URL);
AppService service = resource.accept(MediaTypeUtils.ATOM_SERVICE_DOCUMENT).get(AppService.class);
List<AppWorkspace> workspaces = service.getWorkspace();
for (AppWorkspace workspace : workspaces) {
System.out.println("\t" + workspace.getTitle().getValue());
List<AppCollection> collections = workspace.getCollection();
for (AppCollection collection : collections) {
System.out.println("\t" + collection.getTitle().getValue()
+ "\t:\t"
+ collection.getHref());
}
System.out.print("\n");
}
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2. Getting a Feed
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Resource feedResource = restClient.resource(FEED_URL);
AtomFeed feed = feedResource.accept(MediaType.APPLICATION_ATOM_XML).get(AtomFeed.class);
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3. Posting an entry to a Feed
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Resource feedResource = restClient.resource(FEED_URL);
ClientResponse response =
feedResource.contentType(MediaType.APPLICATION_ATOM_XML).post(newEntry);
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4. Putting a change to an Entry
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Resource feedResource = restClient.resource(ENTRY_URL);
ClientResponse response =
feedResource.contentType(MediaType.APPLICATION_ATOM_XML).put(changedEntry);
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5. Getting an Entry
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Resource feedResource = restClient.resource(ENTRY_URL);
AtomEntry atomEntry = feedResource.accept(MediaType.APPLICATION_ATOM_XML).get(AtomEntry.class);
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6. Deleting an Entry
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Resource feedResource = restClient.resource(ENTRY_URL);
ClientResponse response = feedResource.delete();
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