Android Open Source - RSSNewsReaderApp Rss Feed

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.romanostrechlis.rssnews.content;
//w  w  w. j a v  a2 s  .com
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**  
 * Represents an RSS link.  
 * 
 * <p>It has String attributes id, name, url, category, 
 * content and holds a {@link Collection} and a {@link List}
 * of {@link RssItem}s.
 * 
 * <h3>Constructors</h3>
 * <ul>
 * <li>{@link RssFeed(String, String, String, String)}: 
 * Used to add new RSS feeds to application.</li>
 * <li>{@link RssFeed(String, String, String, Boolean, String, Boolean, String, int)}</li>
 * </ul>
 * 
 * <h3>Methods</h3>
 * <ul>
 * <li>{@link #parseXML()}</li>
 * <li>{@link #getValue(String, Element)}</li>
 * </ul>
 * 
 * @author Romanos Trechlis
 * @version 0.1v Noe 18, 2014.
 */
public class RssFeed {
  private String id;
  private String name;
  private String url;
  private String category;
  private String content;
  private Boolean enabled = true;
  private List<RssItem> list = new ArrayList<RssItem>();
  private Boolean newContent = false;
  
  private int hashCode = 0;
  /**
   * Constructor
   * 
   * @param id
   * @param name
   * @param url
   * @param content
   */
  public RssFeed(String id, String name, String url, String category) {
    this.id = id;
    this.name = name;
    this.url = url;
    this.category = category;
  }

  /**
   * Constructor.
   */
  public RssFeed() {
  }

  /**
   * Constructor.
   * 
   * @param id
   * @param name
   * @param url
   * @param enabled
   * @param category
   * @param newContent
   * @param content
   * @param hashCode
   */
  public RssFeed(String id, String name, String url, Boolean enabled, String category, Boolean newContent, String content,
      int hashCode) {
    this.id = id;
    this.name = name;
    this.url = url;
    this.enabled = enabled;
    this.category = category;
    this.newContent = newContent;
    this.content = content;
    this.hashCode = hashCode;
  }

  // Setters & Getters
  public void setId(String id) { this.id = id; }
  public void setName(String name) { this.name = name; }
  public void setUrl(String url) { this.url = url; }
  public void setCategory(String category) { this.category = category; }
  public void setNewContent(Boolean newContent) { this.newContent = newContent; }
  // public void setNewContent(Boolean newContent) { this.newContent = newContent; }
  public void setHashCode(int hashCode) { this.hashCode = hashCode; }
  public void setEnabled(Boolean enabled) { this.enabled = enabled; }
  public void setList(List<RssItem> list) { this.list = list; }
  /** 
   * Method for setting rss raw content while flagging the existence of new rss items.
   * 
   * @param content
   */
  public void setContent(String content) {
    if (getHashCode() == 0) {
      setNewContent(false);
      setHashCode(content.hashCode());
      this.content = content;
    }
    else if (getHashCode() == content.hashCode()) {
      this.content = content;
      setNewContent(false);
      
    } else {
      this.content = content;
      setNewContent(true);
      setHashCode(content.hashCode()); // set new hash value
    }  
  }

  public String getId() { return id; }
  public String getName() { return name; }
  public String getUrl() { return url; }
  public String getCategory() { return category; }
  public String getContent() { return content; }
  public int getHashCode() { return hashCode; }
  public Boolean getNewContent() { return newContent; }
  public Boolean getEnabled() { return enabled; }
  public List<RssItem> getList() { return list; }

  @Override
  public String toString() {
    return name;
  }

  /**
   * Method called to parse a string from attribute content of Item class.
   * 
   * <p> Adds the resulting RssFeed into a List<RssFeed>
   * 
   * @throws ParserConfigurationException, SAXException, IOException
   */
  public void parseXML() {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db;
    Document dom = null;
    try {
      //Using factory get an instance of document builder
      db = dbf.newDocumentBuilder();
      //parse using builder to get DOM representation of the XML file
      InputSource is = new InputSource(new StringReader(getContent()));
      dom = db.parse(is);
    }catch (ParserConfigurationException | SAXException | IOException e) {
      e.printStackTrace();
    }
    //get a nodelist of elements
    dom.getDocumentElement().normalize();
    NodeList nodes = dom.getElementsByTagName("item");
    for (int i = 0; i < nodes.getLength(); i++) {
      Node node = nodes.item(i);
      RssItem rf = new RssItem();
      if (node.getNodeType() == Node.ELEMENT_NODE) {
        Element element = (Element) node;
        rf.setTitle(getValue("title", element));
        rf.setDescription(getValue("description", element));
        rf.setLink(getValue("link", element));
        rf.setParent(this.getId());
        list.add(rf);
      }
    }
  }

  /**
   * Helper method to {@link #parseXML()}
   * 
   * @param tag
   * @param element
   * @return value between tags.
   */
  private static String getValue(String tag, Element element) {
    NodeList nodes = element.getElementsByTagName(tag).item(0).getChildNodes();
    Node node = (Node) nodes.item(0);
    return node.getNodeValue();
  }
}

Java Source Code List

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