/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/web/trunk/news-api/api/src/java/org/sakaiproject/news/api/NewsService.java $
* $Id: NewsService.java 105080 2012-02-24 23:10:31Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006, 2008 The Sakai Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.news.api;
import java.util.List;
import org.sakaiproject.javax.Filter;
import org.sakaiproject.entity.api.EntityProducer;
/**
* <p>
* NewsService is the interface for retrieving and caching news items from a rss news feed.
* </p>
*/
public interface NewsService extends EntityProducer
{
/** This string can be used to find the service in the service manager. */
public static final String SERVICE_NAME = NewsService.class.getName();
/** This string starts the references to resources in this service. */
public static final String REFERENCE_ROOT = "/news";
/**
* Retrieves a list of rss feeds that are being used.
*
* @return A list of NewsChannel objects (possibly empty).
*/
public List getChannels();
/**
* Retrieves a NewsChannel object indexed by a URL.
*
* @param source
* The url for the channel.
* @return A NewsChannel object (possibly null).
* @throws NewsConnectionException
* @throws NewsFormatException
*/
public NewsChannel getChannel(String source) throws NewsConnectionException, NewsFormatException;
/**
* Retrieves a list of rss feeds that are being used.
*
* @return A list of NewsChannel objects (possibly empty).
* @throws ?
* if param channel is not a valid url.
*/
public void removeChannel(String channel);
/**
* Retrieves a list of items from an rss feed.
*
* @param channel
* The url for the feed.
* @return A list of NewsItem objects retrieved from the feed.
* @throws ?
* if param feed is not a valid url.
*/
public List getNewsitems(String channel) throws NewsConnectionException, NewsFormatException;
/**
* Retrieves a list of items from an rss feed.
*
* @param channel
* The url for the feed.
* @param filter
* A filtering object to accept NewsItems, or null if no filtering is desired.
* @return A list of NewsItem objects retrieved from the feed.
* @throws ?
* if param feed is not a valid url.
*/
public List getNewsitems(String channel, Filter filter) throws NewsConnectionException, NewsFormatException;
/**
* Checks whether an update is available for the rss news feed.
*
* @param feed
* The url for the feed.
* @return true if update is available, false otherwise
* @throws ?
* if param feed is not a valid url.
*/
public boolean isUpdateAvailable(String channel);
}