/**
* Copyright 2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nutch.parse.rss;
import org.apache.commons.feedparser.DefaultFeedParserListener;
import org.apache.commons.feedparser.FeedParserState;
import org.apache.commons.feedparser.FeedParserException;
import java.util.List;
import java.util.Vector;
import org.apache.nutch.parse.rss.structs.RSSChannel;
import org.apache.nutch.parse.rss.structs.RSSItem;
/**
*
* @author mattmann
* @version 1.0
*
* <p>
* Feed parser listener class which builds up an RSS Channel model that can be
* iterated through to retrieve the parsed information.
* </p>
*/
public class FeedParserListenerImpl extends DefaultFeedParserListener {
private List fRssChannels = null;
private RSSChannel fCurrentChannel = null;
/**
* <p>
* Default Constructor
* </p>
*/
public FeedParserListenerImpl() {
fRssChannels = new Vector();
}
/**
* <p>
* Gets a {@link List}of {@link RSSChannel}s that the listener parsed from
* the RSS document.
* </p>
*
* @return A {@link List}of {@link RSSChannel}s.
*/
public List getChannels() {
if (fRssChannels.size() > 0) {
return fRssChannels;
} else {
//there was only one channel found
//add it here, then return it
fRssChannels.add(fCurrentChannel);
return fRssChannels;
}
}
/**
* <p>
* Callback method when the parser encounters an RSS Channel.
* </p>
*
* @param state
* The current state of the FeedParser.
* @param title
* The title of the RSS Channel.
* @param link
* A hyperlink to the RSS Channel.
* @param description
* The description of the RSS Channel.
*/
public void onChannel(FeedParserState state, String title, String link,
String description) throws FeedParserException {
//capture the old channel if it's not null
if (fCurrentChannel != null) {
fRssChannels.add(fCurrentChannel);
}
//System.out.println("Found a new channel: " + title);
fCurrentChannel = new RSSChannel(title, link, description);
}
/**
* <p>
* Callback method when the parser encounters an RSS Item.
* </p>
*
* @param state
* The current state of the FeedParser.
* @param title
* The title of the RSS Item.
* @param link
* A hyperlink to the RSS Item.
* @param description
* The description of the RSS Item.
* @param permalink
* A permanent link to the RSS Item.
*/
public void onItem(FeedParserState state, String title, String link,
String description, String permalink) throws FeedParserException {
//System.out.println("Found a new published article: " + permalink);
if (fCurrentChannel != null) { //should never be null
fCurrentChannel.getItems().add(
new RSSItem(title, link, description, permalink));
}
}
}