/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) frentix GmbH<br>
* http://www.frentix.com<br>
* <p>
*/
package org.olat.modules.webFeed;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import javax.servlet.http.HttpServletResponse;
import org.olat.commons.servlets.RSSServlet;
import org.olat.core.gui.media.MediaResource;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedOutput;
/**
* The media resource for synd feeds. Used for dispatching.
*
* <P>
* Initial Date: Mar 12, 2009 <br>
*
* @author gwassmann
*/
public class SyndFeedMediaResource implements MediaResource {
private SyndFeed feed;
private String feedString;
private static final String CONTENT_TYPE = "application/rss+xml";
public SyndFeedMediaResource(SyndFeed feed) {
this.feed = feed;
feedString = null;
try {
SyndFeedOutput output = new SyndFeedOutput();
feedString = output.outputString(feed);
} catch (FeedException e) {
// cannot convert feed to string or something
}
}
/**
* @see org.olat.core.gui.media.MediaResource#getContentType()
*/
public String getContentType() {
return CONTENT_TYPE;
}
/**
* @see org.olat.core.gui.media.MediaResource#getInputStream()
*/
public InputStream getInputStream() {
ByteArrayInputStream inputStream = null;
try {
inputStream = new ByteArrayInputStream(feedString.getBytes(RSSServlet.DEFAULT_ENCODING));
} catch (UnsupportedEncodingException e) {
// log something
}
return inputStream;
}
/**
* @see org.olat.core.gui.media.MediaResource#getLastModified()
*/
public Long getLastModified() {
Long lastModified = null;
Date date = feed.getPublishedDate();
if (date != null) {
lastModified = Long.valueOf(date.getTime());
}
return lastModified;
}
/**
* @see org.olat.core.gui.media.MediaResource#getSize()
*/
public Long getSize() {
return new Long(feedString.getBytes().length);
}
/**
* @see org.olat.core.gui.media.MediaResource#prepare(javax.servlet.http.HttpServletResponse)
*/
public void prepare(@SuppressWarnings("unused") HttpServletResponse hres) {
// nothing to prepare
}
/**
* @see org.olat.core.gui.media.MediaResource#release()
*/
public void release() {
// nothing to release
}
}