initial commit

2 files changed, 330 insertions, 0 deletions

diff --git a/app/src/main/java/com/camilstaps/rss/RetrieveFeedTask.java b/app/src/main/java/com/camilstaps/rss/RetrieveFeedTask.java
new file mode 100644
index 0000000..543c9d6
--- /dev/null
+++ b/app/src/main/java/com/camilstaps/rss/RetrieveFeedTask.java
@@ -0,0 +1,37 @@
+package com.camilstaps.rss;
+
+import android.os.AsyncTask;
+
+import com.camilstaps.common.Listener;
+
+/**
+ * Asynchronously retrieve an RSS feed
+ * @author Camil Staps
+ */
+public class RetrieveFeedTask extends AsyncTask<String, Void, RssParser> {
+
+    Listener<RssParser> listener;
+
+    public void setRssDownloadListener(Listener<RssParser> listener) {
+        this.listener = listener;
+    }
+
+    @Override
+    protected RssParser doInBackground(String... params) {
+        try {
+            RssParser parser = new RssParser(params[0]);
+            return parser;
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    @Override
+    protected void onPostExecute(RssParser results) {
+        if (results != null) {
+            listener.success(results);
+        } else {
+            listener.failure();
+        }
+    }
+}
diff --git a/app/src/main/java/com/camilstaps/rss/RssParser.java b/app/src/main/java/com/camilstaps/rss/RssParser.java
new file mode 100644
index 0000000..2c32abd
--- /dev/null
+++ b/app/src/main/java/com/camilstaps/rss/RssParser.java
@@ -0,0 +1,293 @@
+package com.camilstaps.rss;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.ArrayList;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+import org.xml.sax.Attributes;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+import org.xml.sax.XMLReader;
+import org.xml.sax.helpers.DefaultHandler;
+import android.util.Log;
+
+/**
+ * RSS parser
+ *
+ * See: http://stackoverflow.com/a/24985128/1544337
+ *
+ * Usage:
+ * RssParser parser = new RssParser(feedUrl);
+ * Log.i("LOG", "Description: " + parser.getItem(3).description); //4th item's description
+ *
+ * @author Camil Staps
+ */
+public class RssParser extends DefaultHandler {
+
+    private StringBuilder   content;
+    private boolean         inChannel;
+    private boolean         inImage;
+    private boolean         inItem;
+
+    private ArrayList<Item> items   = new ArrayList<Item>();
+    private Channel         channel = new Channel();
+
+    private Item            lastItem;
+
+
+    public RssParser(String url) {
+        try {
+            SAXParserFactory spf = SAXParserFactory.newInstance();
+            SAXParser sp = spf.newSAXParser();
+            XMLReader xr = sp.getXMLReader();
+            URL sourceUrl = new URL(url);
+            xr.setContentHandler(this);
+            xr.parse(new InputSource(sourceUrl.openStream()));
+        }
+        catch (ParserConfigurationException e) {
+            e.printStackTrace();
+        }
+        catch (SAXException e) {
+            e.printStackTrace();
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+
+    public class Item {
+
+        public String title;
+        public String description;
+        public String link;
+        public String category;
+        public String pubDate;
+        public String guid;
+    }
+
+
+    public class Channel {
+
+        public String title;
+        public String description;
+        public String link;
+        public String lastBuildDate;
+        public String generator;
+        public String imageUrl;
+        public String imageTitle;
+        public String imageLink;
+        public String imageWidth;
+        public String imageHeight;
+        public String imageDescription;
+        public String language;
+        public String copyright;
+        public String pubDate;
+        public String category;
+        public String ttl;
+    }
+
+
+    @Override
+    public void startDocument() throws SAXException {
+        Log.i("LOG", "StartDocument");
+    }
+
+
+    @Override
+    public void endDocument() throws SAXException {
+        Log.i("LOG", "EndDocument");
+    }
+
+
+    @Override
+    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
+        if (localName.equalsIgnoreCase("image")) {
+            inImage = true;
+        }
+
+        if (localName.equalsIgnoreCase("channel")) {
+            inChannel = true;
+        }
+
+        if (localName.equalsIgnoreCase("item")) {
+            lastItem = new Item();
+            items.add(lastItem);
+            inItem = true;
+        }
+
+        content = new StringBuilder();
+    }
+
+
+    @Override
+    public void endElement(String uri, String localName, String qName) throws SAXException {
+        if (localName.equalsIgnoreCase("image")) {
+            inImage = false;
+        }
+
+        if (localName.equalsIgnoreCase("channel")) {
+            inChannel = false;
+        }
+
+        if (localName.equalsIgnoreCase("item")) {
+            inItem = false;
+        }
+
+        if (localName.equalsIgnoreCase("title")) {
+            if (content == null) {
+                return;
+            }
+
+            if (inItem) {
+                lastItem.title = content.toString();
+            } else if (inImage) {
+                channel.imageTitle = content.toString();
+            } else if (inChannel) {
+                channel.title = content.toString();
+            }
+
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("description")) {
+            if (content == null) {
+                return;
+            }
+
+            if (inItem) {
+                lastItem.description = content.toString();
+            } else if (inImage) {
+                channel.imageDescription = content.toString();
+            } else if (inChannel) {
+                channel.description = content.toString();
+            }
+
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("link")) {
+            if (content == null) {
+                return;
+            }
+
+            if (inItem) {
+                lastItem.link = content.toString();
+            } else if (inImage) {
+                channel.imageLink = content.toString();
+            } else if (inChannel) {
+                channel.link = content.toString();
+            }
+
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("category")) {
+            if (content == null) {
+                return;
+            }
+
+            if (inItem) {
+                lastItem.category = content.toString();
+            } else if (inChannel) {
+                channel.category = content.toString();
+            }
+
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("pubDate")) {
+            if (content == null) {
+                return;
+            }
+
+            if (inItem) {
+                lastItem.pubDate = content.toString();
+            } else if (inChannel) {
+                channel.pubDate = content.toString();
+            }
+
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("guid")) {
+            if (content == null) {
+                return;
+            }
+
+            lastItem.guid = content.toString();
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("url")) {
+            if (content == null) {
+                return;
+            }
+
+            channel.imageUrl = content.toString();
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("width")) {
+            if (content == null) {
+                return;
+            }
+
+            channel.imageWidth = content.toString();
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("height")) {
+            if (content == null) {
+                return;
+            }
+
+            channel.imageHeight = content.toString();
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("language")) {
+            if (content == null) {
+                return;
+            }
+
+            channel.language = content.toString();
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("copyright")) {
+            if (content == null) {
+                return;
+            }
+
+            channel.copyright = content.toString();
+            content = null;
+        }
+
+        if (localName.equalsIgnoreCase("ttl")) {
+            if (content == null) {
+                return;
+            }
+
+            channel.ttl = content.toString();
+            content = null;
+        }
+    }
+
+
+    @Override
+    public void characters(char[] ch, int start, int length) throws SAXException {
+        if (content == null) {
+            return;
+        }
+
+        content.append(ch, start, length);
+    }
+
+
+    public Item getItem(int index) {
+        return items.get(index);
+    }
+}
\ No newline at end of file