Programming for beginners: Abdera: Atom Link element

Link element defines a reference from an entry or feed to a Web resource.

Example

<link rel='http://schemas.google.com/g/2005#feed' type='application/atom+xml' href='https://self-learning-java-tutorial.blogspot.com/feeds/posts/default'/>
  <link rel='self' type='application/atom+xml' href='http://www.blogger.com/feeds/3062500619105519975/posts/default?alt=atom'/>
  <link rel='alternate' type='text/html' href='https://self-learning-java-tutorial.blogspot.com/'/>
  <link rel='hub' href='http://pubsubhubbub.appspot.com/'/>
  <link rel='next' type='application/atom+xml' href='http://www.blogger.com/feeds/3062500619105519975/posts/default?alt=atom&amp;start-index=26&amp;max-results=25'/>

Link element has following attributes.

a. href

b. rel

c. type

d. hreflang

e. title

f. length

href attribute

href attriute contain a link IRI.

rel attribute

rel attribute specifies link relation type. If this attribute is not present, then link relation type is treated as ‘alternate’. Please go through following link to know about all the values associated with rel attribute.

http://www.iana.org/assignments/link-relations/link-relations.xhtml

type attribute

type represent media type like ‘text’, ‘application/atom+xml’ etc.,

hreflang attribute

It describes the language of the resource pointed to by the href attribute.

title attribute

The "title" attribute conveys human-readable information about the link. The content of the "title" attribute is Language-Sensitive. Entities such as "&" and "<" represent their corresponding characters ("&" and "<", respectively), not markup. Link elements MAY have a title attribute.

length attribute

The "length" attribute indicates an advisory length of the linked content in octets; it is a hint about the content length of the representation returned when the IRI in the href attribute is mapped to a URI and dereferenced. Note that the length attribute does not override the actual content length of the representation as reported by the underlying protocol.

Following is the complete working application.

HelloWorld.java

import java.io.IOException;
import java.util.Date;

import org.apache.abdera.Abdera;
import org.apache.abdera.model.Content;
import org.apache.abdera.model.Entry;
import org.apache.abdera.model.Feed;
import org.apache.abdera.model.Text;
import org.apache.abdera.writer.Writer;

public class HelloWorld {

 private static void addMetaData(Feed feed) {
  feed.setId("tag:blogger.com,1999:blog-3062500619105519975");
  feed.setUpdated(new Date());
  feed.setTitle("java tutorial : Blog to learn java programming");
  feed.setSubtitle("Learners Blog");

  feed.addCategory("scheme", "Programming", "Java Tutorial for beginners");

  feed.addContributor("Krishna", "Krishna@Krishna.com", "https://self-learning-java-tutorial.blogspot.com");

  feed.setGenerator("http://www.blogger.com", "7.00", "Blogger");

  feed.setIcon("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJHpypki-Y-JqQUorVvFkZkU0JWZKxkb138p8W-saAaVr4qaPKTgpkE7BV8sqq0elgI_pDejsHMxTEmY2KPLgwrkfyQXwWqkXYWRUJIKj_ci1JDFzVpKg1lddacb8SifWynpsWfmR_RH4j/s1600/1.bmp");

  addLinksToFeed(feed);
  addAuthorToFeed(feed);
 }

 private static void addLinksToFeed(Feed feed) {
  /* Adding Links */
  String rel = "http://schemas.google.com/g/2005#feed";
  String type = "application/atom+xml";
  String href = "https://self-learning-java-tutorial.blogspot.com/feeds/posts/default";
  String title = "";
  String hreflang = "";
  long length = 0;

  feed.addLink(href, rel, type, title, hreflang, length);

  rel = "self";
  type = "application/atom+xml";
  href = "http://www.blogger.com/feeds/3062500619105519975/posts/default?alt=atom";

  feed.addLink(href, rel, type, title, hreflang, length);

 }

 private static void addAuthorToFeed(Feed feed) {
  String name = "hari krishna";
  String email = "noreply@blogger.com";
  String iri = "https://self-learning-java-tutorial.blogspot.com";

  feed.addAuthor(name, email, iri);
 }

 private static void addEntry(Feed feed) {

  Entry entry1 = feed.addEntry();
  entry1.setId("tag:blogger.com,1999:blog-3062500619105519975.post-918659526208416960");
  Date date = new Date();
  entry1.setPublished(date);
  entry1.setUpdated(date);
  entry1.setTitle("SWT: Slider Tutorial", Text.Type.TEXT);
  entry1.setContent("Slider class is used to define Slider widget", Content.Type.HTML);
  entry1.addAuthor("Hari Krishna Gurram", "noreply@blogger.com",
    "https://self-learning-java-tutorial.blogspot.com");
  entry1.addAuthor("Rama Krishna Gurram", "noreply@blogger.com",
    "https://self-learning-java-tutorial.blogspot.com");
  entry1.addContributor("Ritweek Mehenty", "noreply@blogger.com",
    "https://self-learning-java-tutorial.blogspot.com");
  entry1.addContributor("Sailaja Navakotla", "noreply@blogger.com",
    "https://self-learning-java-tutorial.blogspot.com");

  entry1.addCategory("scheme", "GUI", "SWT for beginners");

  feed.addEntry(entry1);
 }

 public static void main(String args[]) throws IOException {
  Abdera abdera = new Abdera();

  /* Create a new Feed instance. */
  Feed feed = abdera.newFeed();

  /* Populate feed */
  addMetaData(feed);
  addEntry(feed);

  /* Print the feed to console */
  Writer writer = abdera.getWriterFactory().getWriter("prettyxml");
  feed.writeTo(writer, System.out);
 }
}

Output

<?xml version='1.0' encoding='UTF-8'?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <id>tag:blogger.com,1999:blog-3062500619105519975</id>
  <updated>2016-12-17T16:30:00.403Z</updated>
  <title type="text">java tutorial : Blog to learn java programming</title>
  <subtitle type="text">Learners Blog</subtitle>
  <category term="Programming" scheme="scheme" label="Java Tutorial for beginners"/>
  <contributor>
    <name>Krishna</name>
    <email>Krishna@Krishna.com</email>
    <uri>https://self-learning-java-tutorial.blogspot.com</uri>
  </contributor>
  <generator uri="http://www.blogger.com" version="7.00">Blogger</generator>
  <icon>https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJHpypki-Y-JqQUorVvFkZkU0JWZKxkb138p8W-saAaVr4qaPKTgpkE7BV8sqq0elgI_pDejsHMxTEmY2KPLgwrkfyQXwWqkXYWRUJIKj_ci1JDFzVpKg1lddacb8SifWynpsWfmR_RH4j/s1600/1.bmp</icon>
  <link href="https://self-learning-java-tutorial.blogspot.com/feeds/posts/default" rel="http://schemas.google.com/g/2005#feed" type="application/atom+xml" title="" hreflang="" length="0"/>
  <link href="http://www.blogger.com/feeds/3062500619105519975/posts/default?alt=atom" rel="self" type="application/atom+xml" title="" hreflang="" length="0"/>
  <author>
    <name>hari krishna</name>
    <email>noreply@blogger.com</email>
    <uri>https://self-learning-java-tutorial.blogspot.com</uri>
  </author>
  <entry>
    <id>tag:blogger.com,1999:blog-3062500619105519975.post-918659526208416960</id>
    <published>2016-12-17T16:30:00.430Z</published>
    <updated>2016-12-17T16:30:00.430Z</updated>
    <title type="text">SWT: Slider Tutorial</title>
    <content type="html">Slider class is used to define Slider widget</content>
    <author>
      <name>Hari Krishna Gurram</name>
      <email>noreply@blogger.com</email>
      <uri>https://self-learning-java-tutorial.blogspot.com</uri>
    </author>
    <author>
      <name>Rama Krishna Gurram</name>
      <email>noreply@blogger.com</email>
      <uri>https://self-learning-java-tutorial.blogspot.com</uri>
    </author>
    <contributor>
      <name>Ritweek Mehenty</name>
      <email>noreply@blogger.com</email>
      <uri>https://self-learning-java-tutorial.blogspot.com</uri>
    </contributor>
    <contributor>
      <name>Sailaja Navakotla</name>
      <email>noreply@blogger.com</email>
      <uri>https://self-learning-java-tutorial.blogspot.com</uri>
    </contributor>
    <category term="GUI" scheme="scheme" label="SWT for beginners"/>
  </entry>
</feed>

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Wednesday 24 May 2017

Abdera: Atom Link element

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