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    1   /*
    2    * Copyright 2001-2005 The Apache Software Foundation
    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 examples.nntp;
    18
    19  import java.io.IOException;
    20  import java.io.PrintWriter;
    21  import java.net.SocketException;
    22
    23  import org.apache.commons.net.nntp.Article;
    24  import org.apache.commons.net.nntp.NNTPClient;
    25  import org.apache.commons.net.nntp.NewsgroupInfo;
    26  import org.apache.commons.net.nntp.Threader;
    27
    28  import examples.PrintCommandListener;
    29
    30  public class MessageThreading {
    31  	public MessageThreading() {
    32  	}
    33
    34  	public static void main(String[] args) throws SocketException, IOException {
    35
    36  		if (args.length != 3)
    37  			usage();
    38
    39  		String hostname = args[0];
    40  		String user = args[1];
    41  		String password = args[2];
    42
    43  		NNTPClient client = new NNTPClient();
    44  		client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
    45  		client.connect(hostname);
    46
    47  		if(!client.authenticate(user, password)) {
    48  			System.out.println("Authentication failed for user " + user + "!");
    49  			System.exit(1);
    50  		}
    51
    52  		NewsgroupInfo group = new NewsgroupInfo();
    53  		client.selectNewsgroup("comp.lang.lisp", group);
    54
    55  		int lowArticleNumber = group.getFirstArticle();
    56  		int highArticleNumber = lowArticleNumber + 100;
    57
    58  		System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
    59  		Article[] articles = NNTPUtils.getArticleInfo(client, lowArticleNumber, highArticleNumber);
    60
    61  		System.out.println("Building message thread tree...");
    62  		Threader threader = new Threader();
    63  		Article root = (Article)threader.thread(articles);
    64
    65  		Article.printThread(root, 0);
    66
    67  	}
    68
    69
    70  	public static void usage() {
    71  		System.out.println("Usage: MessageThreading <hostname> <user> <password>");
    72  		System.exit(0);
    73  	}
    74  }