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Java > Open Source Codes > com > sun > syndication > fetcher > samples > FeedAggregator


1 /*
2  * Copyright 2004 Sun Microsystems, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package com.sun.syndication.fetcher.samples;
18
19 import java.io.PrintWriter JavaDoc;
20 import java.net.URL JavaDoc;
21 import java.util.ArrayList JavaDoc;
22 import java.util.List JavaDoc;
23
24 import com.sun.syndication.feed.synd.SyndFeedImpl;
25 import com.sun.syndication.feed.synd.SyndFeed;
26 import com.sun.syndication.fetcher.FeedFetcher;
27 import com.sun.syndication.fetcher.impl.FeedFetcherCache;
28 import com.sun.syndication.fetcher.impl.HashMapFeedInfoCache;
29 import com.sun.syndication.fetcher.impl.HttpURLFeedFetcher;
30 import com.sun.syndication.io.SyndFeedOutput;
31
32 /**
33  * <p>It aggregates a list of RSS/Atom feeds (they can be of different types)
34  * into a single feed of the specified type.</p>
35  *
36  * <p>Converted from the original FeedAggregator sample</p>
37  *
38  * @author Alejandro Abdelnur
39  * @author Nick Lothian
40  *
41  */
42 public class FeedAggregator {
43
44     public static void main(String JavaDoc[] args) {
45         boolean ok = false;
46         if (args.length>=2) {
47             try {
48                 String JavaDoc outputType = args[0];
49
50                 SyndFeed feed = new SyndFeedImpl();
51                 feed.setFeedType(outputType);
52
53                 feed.setTitle("Aggregated Feed");
54                 feed.setDescription("Anonymous Aggregated Feed");
55                 feed.setAuthor("anonymous");
56                 feed.setLink("http://www.anonymous.com");
57
58                 List JavaDoc entries = new ArrayList JavaDoc();
59                 feed.setEntries(entries);
60
61                 FeedFetcherCache feedInfoCache = HashMapFeedInfoCache.getInstance();
62                 FeedFetcher feedFetcher = new HttpURLFeedFetcher(feedInfoCache);
63
64                 for (int i=1;i<args.length;i++) {
65                     URL JavaDoc inputUrl = new URL JavaDoc(args[i]);
66                     SyndFeed inFeed = feedFetcher.retrieveFeed(inputUrl);
67                     entries.addAll(inFeed.getEntries());
68                 }
69
70                 SyndFeedOutput output = new SyndFeedOutput();
71                 output.output(feed, new PrintWriter JavaDoc(System.out));
72
73                 ok = true;
74             }
75             catch (Exception JavaDoc ex) {
76                 System.out.println("ERROR: "+ex.getMessage());
77                 ex.printStackTrace();
78             }
79         }
80
81         if (!ok) {
82             System.out.println();
83             System.out.println("FeedAggregator aggregates different feeds into a single one.");
84             System.out.println("The first parameter must be the feed type for the aggregated feed.");
85             System.out.println(" [valid values are: rss_0.9, rss_0.91, rss_0.92, rss_0.93, ]");
86             System.out.println(" [ rss_0.94, rss_1.0, rss_2.0 & atom_0.3 ]");
87             System.out.println("The second to last parameters are the URLs of feeds to aggregate.");
88             System.out.println();
89         }
90     }
91
92 }
93
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