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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  import org.apache.commons.net.PrintCommandListener;
25  import org.apache.commons.net.nntp.Article;
26  import org.apache.commons.net.nntp.NNTPClient;
27  import org.apache.commons.net.nntp.NewsgroupInfo;
28  import org.apache.commons.net.nntp.Threader;
29  
30  /**
31   * Sample program demonstrating the use of article iteration and threading.
32   */
33  public class MessageThreading {
34      public MessageThreading() {
35      }
36  
37      public static void main(String[] args) throws SocketException, IOException {
38  
39          if (args.length != 2 && args.length != 4) {
40              System.out.println("Usage: MessageThreading <hostname> <groupname> [<user> <password>]");
41              return;
42          }
43  
44          String hostname = args[0];
45          String newsgroup = args[1];
46  
47          NNTPClient client = new NNTPClient();
48          client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
49          client.connect(hostname);
50  
51          if (args.length == 4) { // Optional auth
52              String user = args[2];
53              String password = args[3];
54              if(!client.authenticate(user, password)) {
55                  System.out.println("Authentication failed for user " + user + "!");
56                  System.exit(1);
57              }
58          }
59  
60          String fmt[] = client.listOverviewFmt();
61          if (fmt != null) {
62              System.out.println("LIST OVERVIEW.FMT:");
63              for(String s : fmt) {
64                  System.out.println(s);
65              }
66          } else {
67              System.out.println("Failed to get OVERVIEW.FMT");
68          }
69          NewsgroupInfo group = new NewsgroupInfo();
70          client.selectNewsgroup(newsgroup, group);
71  
72          long lowArticleNumber = group.getFirstArticleLong();
73          long highArticleNumber = lowArticleNumber + 5000;
74  
75          System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
76          Iterable<Article> articles = client.iterateArticleInfo(lowArticleNumber, highArticleNumber);
77  
78          System.out.println("Building message thread tree...");
79          Threader threader = new Threader();
80          Article root = (Article)threader.thread(articles);
81  
82          Article.printThread(root, 0);
83      }
84  
85  }