/*
* Copyright (c) 2003-2011, Simon Brown
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* - Neither the name of Pebble nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package net.sourceforge.pebble.decorator;
import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.feed.synd.SyndLink;
import com.sun.syndication.feed.synd.SyndLinkImpl;
import net.sourceforge.pebble.api.decorator.FeedDecorator;
import net.sourceforge.pebble.domain.Blog;
import net.sourceforge.pebble.domain.BlogEntry;
import net.sourceforge.pebble.domain.Response;
import net.sourceforge.pebble.event.blogentry.PubSubHubBubBlogEntryListener;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.*;
/**
* Adds hub links to the feed, implementing the discovery part of pubsubhubbub
*
* @author James Roper
*/
public class PubSubHubBubFeedDecorator implements FeedDecorator {
private static final Log log = LogFactory.getLog(PubSubHubBubFeedDecorator.class);
public static final String HUBS_PROPERTY = "pubsubhubbub.hubs";
private volatile Boolean listenerEnabled;
public void decorate(SyndFeed feed, Blog blog) {
if (checkListenerEnabled(blog)) {
List<SyndLink> links = new ArrayList<SyndLink>(feed.getLinks());
for (String hub : getHubs(blog)) {
SyndLink link = new SyndLinkImpl();
link.setRel("hub");
link.setHref(hub.trim());
links.add(link);
}
feed.setLinks(links);
} else {
log.warn("PubSubHubBub Feed Decorator plugin is enabled, however the PubSubHubBub " +
"blog entry listener does not appeared to be enabled. Not adding hub to feed, " +
"otherwise aggregators will never get updates.");
}
}
public void decorate(SyndFeed feed, Blog blog, BlogEntry blogEntry) {
// We don't use hubs for response feeds
}
public void decorate(SyndEntry entry, Blog blog, BlogEntry blogEntry) {
}
public void decorate(SyndEntry entry, Blog blog, Response response) {
// We don't use hubs for response feeds
}
private boolean checkListenerEnabled(Blog blog) {
return blog.getBlogEntryListeners().contains(PubSubHubBubBlogEntryListener.class.getName());
}
private Collection<String> getHubs(Blog blog) {
String hubs = blog.getPluginProperties().getProperty(HUBS_PROPERTY);
if (hubs == null || hubs.length() == 0) {
return Collections.emptyList();
}
return Arrays.asList(hubs.split(","));
}
}