/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.shindig.gadgets;
import com.sun.syndication.feed.synd.SyndContent;
import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.feed.synd.SyndPerson;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedInput;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.StringReader;
import java.util.List;
/**
* Processes RSS & Atom Feeds and converts them into JSON output.
*/
public class FeedProcessor {
/**
* Converts feed XML to JSON.
*
* @param feedUrl The url that the feed was retrieved from.
* @param feedXml The raw XML of the feed to be converted.
* @param getSummaries True if summaries should be returned.
* @param numEntries Number of entries to return.
* @return The JSON representation of the feed.
*/
@SuppressWarnings("unchecked")
public JSONObject process(String feedUrl, String feedXml,
boolean getSummaries, int numEntries) throws GadgetException {
try {
SyndFeed feed = new SyndFeedInput().build(new StringReader(feedXml));
JSONObject json = new JSONObject();
json.put("Title", feed.getTitle());
json.put("URL", feedUrl);
json.put("Description", feed.getDescription());
json.put("Link", feed.getLink());
List<SyndPerson> authors = feed.getAuthors();
String jsonAuthor = null;
if (authors != null && !authors.isEmpty()) {
SyndPerson author = authors.get(0);
if (author.getName() != null) {
jsonAuthor = author.getName();
} else if (author.getEmail() != null) {
jsonAuthor = author.getEmail();
}
}
JSONArray entries = new JSONArray();
json.put("Entry", entries);
int entryCnt = 0;
for (Object obj : feed.getEntries()) {
SyndEntry e = (SyndEntry) obj;
if (entryCnt >= numEntries) {
break;
}
entryCnt++;
JSONObject entry = new JSONObject();
entry.put("Title", e.getTitle());
entry.put("Link", e.getLink());
if (getSummaries) {
if (e.getContents() != null && !e.getContents().isEmpty()) {
entry.put("Summary",
((SyndContent)e.getContents().get(0)).getValue());
} else {
entry.put("Summary",
e.getDescription() != null ? e.getDescription().getValue() : "");
}
}
if (e.getUpdatedDate() != null) {
entry.put("Date", e.getUpdatedDate().getTime());
} else if (e.getPublishedDate() != null) {
entry.put("Date", e.getPublishedDate().getTime());
} else {
entry.put("Date", 0);
}
// if no author at feed level, use the first entry author
if (jsonAuthor == null) {
jsonAuthor = e.getAuthor();
}
entries.put(entry);
}
json.put("Author", (jsonAuthor != null) ? jsonAuthor : "");
return json;
} catch (JSONException e) {
// This shouldn't ever happen.
throw new RuntimeException(e);
} catch (FeedException e) {
throw new GadgetException(GadgetException.Code.MALFORMED_XML_DOCUMENT, e);
}
}
}