/**
* Parses the document using the expected RSS format.
*
* @return Feed
*/
@Override
public Feed parse(Document document) {
Feed feed = new Feed();
// Get the root node.
Node rssElement = document.getFirstChild();
NamedNodeMap attrMap = rssElement.getAttributes();
feed.setVersion(attrMap.getNamedItem("version").getNodeValue());
// Now get channel.
NodeList childNodes = rssElement.getChildNodes();
Node channelNode = null;
for (int index = 0; index < childNodes.getLength(); index++) {
Node childNode = childNodes.item(index);
if (!childNode.getNodeName().equalsIgnoreCase("channel")) {
continue;
}
channelNode = childNode;
}
if (channelNode == null) {
throw new ParserException("Parser could not find the channel element in the RSS feed.");
}
// We've done enough here...
return parseChannel(feed, channelNode);
}
/**
* Handles a Node (determining whether it is a title, description, item, etc. and handling it
* appropriately).
*
* @param feed The feed to set any values to.
* @param node The node.
*/
private void parseNode(Feed feed, Node node) {
switch (node.getNodeName().toLowerCase()) {
case "title":
feed.setTitle(getNodeValue(node));
break;
case "description":
feed.setDescription(getNodeValue(node));
break;
case "link":
feed.setLink(getNodeValue(node));
break;
case "lastbuilddate":
feed.setUpdated(getNodeValue(node));
break;
case "item":
parseItem(feed, node);
break;
}
}
/**
* Parses a node representing an item.
*
* @param feed
* @param node
*/
private void parseItem(Feed feed, Node node) {
NodeList childNodes = node.getChildNodes();
FeedItem feedItem = new FeedItem();
for (int index = 0; index < childNodes.getLength(); index++) {
Node childNode = childNodes.item(index);
// We aren't interested in text nodes.
if (childNode.getNodeType() == Node.TEXT_NODE) {
continue;
}
parseItemNode(feedItem, childNode);
}
feed.getItems().add(feedItem);
}
