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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  
19  package examples.nntp;
20  
21  import java.io.IOException;
22  import java.io.PrintWriter;
23  import java.net.SocketException;
24  
25  import org.apache.commons.net.PrintCommandListener;
26  import org.apache.commons.net.nntp.Article;
27  import org.apache.commons.net.nntp.NNTPClient;
28  import org.apache.commons.net.nntp.NewsgroupInfo;
29  import org.apache.commons.net.nntp.Threader;
30  
31  
32  public class MessageThreading {
33      public MessageThreading() {
34      }
35      
36      public static void main(String[] args) throws SocketException, IOException {
37          
38          if (args.length != 3)
39              usage();
40          
41          String hostname = args[0];
42          String user = args[1];
43          String password = args[2];
44          
45          NNTPClient client = new NNTPClient();
46          client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
47          client.connect(hostname);
48          
49          if(!client.authenticate(user, password)) {
50              System.out.println("Authentication failed for user " + user + "!");
51              System.exit(1);
52          }
53          
54          NewsgroupInfo group = new NewsgroupInfo();
55          client.selectNewsgroup("comp.lang.lisp", group);
56          
57          int lowArticleNumber = group.getFirstArticle();
58          int highArticleNumber = lowArticleNumber + 100;
59          
60          System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
61          Article[] articles = NNTPUtils.getArticleInfo(client, lowArticleNumber, highArticleNumber);
62          
63          System.out.println("Building message thread tree...");
64          Threader threader = new Threader();
65          Article root = (Article)threader.thread(articles);
66          
67          Article.printThread(root, 0);
68          
69      }
70      
71      
72      public static void usage() {
73          System.out.println("Usage: MessageThreading <hostname> <user> <password>");
74          System.exit(0);
75      }
76  }