MessageThreading.java

  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.  *      https://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. package org.apache.commons.net.examples.nntp;

  18. import java.io.IOException;
  19. import java.net.SocketException;

  20. import org.apache.commons.net.examples.PrintCommandListeners;
  21. import org.apache.commons.net.nntp.Article;
  22. import org.apache.commons.net.nntp.NNTPClient;
  23. import org.apache.commons.net.nntp.NewsgroupInfo;
  24. import org.apache.commons.net.nntp.Threader;

  25. /**
  26.  * Sample program demonstrating the use of article iteration and threading.
  27.  */
  28. public class MessageThreading {
  29.     public static void main(final String[] args) throws SocketException, IOException {

  30.         if (args.length != 2 && args.length != 4) {
  31.             System.out.println("Usage: MessageThreading <hostname> <groupname> [<user> <password>]");
  32.             return;
  33.         }

  34.         final String hostname = args[0];
  35.         final String newsgroup = args[1];

  36.         final NNTPClient client = new NNTPClient();
  37.         client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
  38.         client.connect(hostname);

  39.         if (args.length == 4) { // Optional auth
  40.             final String user = args[2];
  41.             final String password = args[3];
  42.             if (!client.authenticate(user, password)) {
  43.                 System.out.println("Authentication failed for user " + user + "!");
  44.                 System.exit(1);
  45.             }
  46.         }

  47.         final String[] fmt = client.listOverviewFmt();
  48.         if (fmt != null) {
  49.             System.out.println("LIST OVERVIEW.FMT:");
  50.             for (final String s : fmt) {
  51.                 System.out.println(s);
  52.             }
  53.         } else {
  54.             System.out.println("Failed to get OVERVIEW.FMT");
  55.         }
  56.         final NewsgroupInfo group = new NewsgroupInfo();
  57.         client.selectNewsgroup(newsgroup, group);

  58.         final long lowArticleNumber = group.getFirstArticleLong();
  59.         final long highArticleNumber = lowArticleNumber + 5000;

  60.         System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
  61.         final Iterable<Article> articles = client.iterateArticleInfo(lowArticleNumber, highArticleNumber);

  62.         System.out.println("Building message thread tree...");
  63.         final Threader threader = new Threader();
  64.         final Article root = (Article) threader.thread(articles);

  65.         Article.printThread(root, 0);
  66.     }

  67.     public MessageThreading() {
  68.     }

  69. }