001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    
019    package examples.nntp;
020    
021    import java.io.IOException;
022    import java.io.PrintWriter;
023    import java.net.SocketException;
024    
025    import org.apache.commons.net.PrintCommandListener;
026    import org.apache.commons.net.nntp.Article;
027    import org.apache.commons.net.nntp.NNTPClient;
028    import org.apache.commons.net.nntp.NewsgroupInfo;
029    import org.apache.commons.net.nntp.Threader;
030    
031    
032    public class MessageThreading {
033        public MessageThreading() {
034        }
035        
036        public static void main(String[] args) throws SocketException, IOException {
037            
038            if (args.length != 3)
039                usage();
040            
041            String hostname = args[0];
042            String user = args[1];
043            String password = args[2];
044            
045            NNTPClient client = new NNTPClient();
046            client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
047            client.connect(hostname);
048            
049            if(!client.authenticate(user, password)) {
050                System.out.println("Authentication failed for user " + user + "!");
051                System.exit(1);
052            }
053            
054            NewsgroupInfo group = new NewsgroupInfo();
055            client.selectNewsgroup("comp.lang.lisp", group);
056            
057            int lowArticleNumber = group.getFirstArticle();
058            int highArticleNumber = lowArticleNumber + 100;
059            
060            System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
061            Article[] articles = NNTPUtils.getArticleInfo(client, lowArticleNumber, highArticleNumber);
062            
063            System.out.println("Building message thread tree...");
064            Threader threader = new Threader();
065            Article root = (Article)threader.thread(articles);
066            
067            Article.printThread(root, 0);
068            
069        }
070        
071        
072        public static void usage() {
073            System.out.println("Usage: MessageThreading <hostname> <user> <password>");
074            System.exit(0);
075        }
076    }