DOMParser.java

package com.iven.lfflfeedreader.domparser;

import android.content.res.Resources;
import android.os.Build;
import android.webkit.MimeTypeMap;

import org.jsoup.Jsoup;
import org.jsoup.select.Elements;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import java.net.MalformedURLException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

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

//Parses an RSS feed and adds the information to a new RSSFeed object.

//Original author Isaac Whitfield
//Extended by EnricoD

public class DOMParser {

    //create a new RSS feed

    private RSSFeed _feed = new RSSFeed();

    @SuppressWarnings("deprecation")
    public RSSFeed parseXml(String xml) {

        //getting XML content
        URL url = null;
        try {

            //find the new URL from the given URL
            url = new URL(xml);
        } catch (MalformedURLException e1) {

            //throw an exception
            e1.printStackTrace();
        }

        //get the DOM element of the XML file. Below function will parse the XML content and will give you DOM element.
        try {

            //create a new DocumentBuilder
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();

            //parse the XML
            Document doc = db.parse(new InputSource(url.openStream()));

            //normalize the data
            doc.getDocumentElement().normalize();

            //get each xml child element value by passing element node name

            //get all <item> tags.
            NodeList nl = doc.getElementsByTagName("item");

            //get size of the list
            int length = nl.getLength();

            //looping through all item nodes
            for (int i = 0; i < length; i++) {

                Node currentNode = nl.item(i);
                RSSItem _item = new RSSItem();

                //create a new node of the first item
                NodeList nchild = currentNode.getChildNodes();

                //get size of the child list
                int clength = nchild.getLength();

                //for all the children of a node
                for (int j = 0; j < clength; j++) {

                    //get the name of the child
                    Node thisNode = nchild.item(j);
                    String theString = null;

                    //if there is at least one child element
                    if (thisNode != null && thisNode.getFirstChild() != null) {

                        //set the string to be the value of the node
                        theString = nchild.item(j).getFirstChild().getNodeValue();
                    }

                    //if the string isn't null
                    if (theString != null) {

                        //set the appropriate value
                        String nodeName = thisNode.getNodeName();
                        if ("title".equals(nodeName)) {
                            _item.setTitle(theString);

                        }

                        //feed link
                        else if ("link".equals(nodeName)) {
                            _item.setLink(theString);
                        }

                        //complete description from content:encoded
                        else if ("content:encoded".equals(nodeName)) {

                            org.jsoup.nodes.Document docHtml = Jsoup
                                    .parse(theString);

                            //select images by tag
                            Elements imgEle = docHtml.select("img");

                            //extract the images src from content:encoded
                            String src = imgEle.attr("src");

                            //setImage2() src
                            _item.setImage2(processImageUrl(src));

                            //set complete description
                            _item.setCompleteDescription(theString);

                            //description method is used when complete description returns 'no desc'
                        } else if ("description".equals(nodeName)) {
                            _item.setDescription(theString);

                            org.jsoup.nodes.Document docHtml = Jsoup
                                    .parse(theString);

                            //select images by tag
                            Elements imgEle = docHtml.select("img");

                            //get src attribute
                            String src = imgEle.attr("src");

                            //setImage() src
                            _item.setImage(processImageUrl(src));

                        }

                        //publication date
                        else if ("pubDate".equals(nodeName)) {

                            //replace some text inside date
                            String formatedDate = theString.replace(" +0000", "");

                            Locale loc;

                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                                loc = Resources.getSystem().getConfiguration().getLocales().get(0);
                            } else {
                                loc = Resources.getSystem().getConfiguration().locale;
                            }

                            //change date format
                            SimpleDateFormat curFormater = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss", java.util.Locale.US);
                            Date dateObj = curFormater.parse(formatedDate);
                            SimpleDateFormat postFormater = new SimpleDateFormat("EEE, dd.MM.yyyy - HH:mm", loc);

                            //get the timezone settings from the phone
                            String timezoneID = TimeZone.getDefault().getID();

                            //set it dynamically
                            postFormater.setTimeZone(TimeZone.getTimeZone(timezoneID));
                            String newDateStr = postFormater.format(dateObj);

                            _item.setDate(newDateStr);
                        }
                    }
                }

                //add the new item to the RSS feed
                _feed.addItem(_item);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        //return the feed
        return _feed;
    }

    //process images urls to get a "pure" image link, i.e something.extension (extension= .jpg, .png, .gif etc)
    private String processImageUrl(String imagesUrl) {

        //get image extension
        String extension = MimeTypeMap.getFileExtensionFromUrl(imagesUrl);

        //return pure url
        return imagesUrl.substring(0, imagesUrl.indexOf(extension)) + extension;
    }
}