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
019package examples.nntp;
020
021import java.io.IOException;
022import java.io.PrintWriter;
023import java.net.SocketException;
024import org.apache.commons.net.PrintCommandListener;
025import org.apache.commons.net.nntp.Article;
026import org.apache.commons.net.nntp.NNTPClient;
027import org.apache.commons.net.nntp.NewsgroupInfo;
028import org.apache.commons.net.nntp.Threader;
029
030/**
031 * Sample program demonstrating the use of article iteration and threading.
032 */
033public class MessageThreading {
034    public MessageThreading() {
035    }
036
037    public static void main(String[] args) throws SocketException, IOException {
038
039        if (args.length != 2 && args.length != 4) {
040            System.out.println("Usage: MessageThreading <hostname> <groupname> [<user> <password>]");
041            return;
042        }
043
044        String hostname = args[0];
045        String newsgroup = args[1];
046
047        NNTPClient client = new NNTPClient();
048        client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
049        client.connect(hostname);
050
051        if (args.length == 4) { // Optional auth
052            String user = args[2];
053            String password = args[3];
054            if(!client.authenticate(user, password)) {
055                System.out.println("Authentication failed for user " + user + "!");
056                System.exit(1);
057            }
058        }
059
060        String fmt[] = client.listOverviewFmt();
061        if (fmt != null) {
062            System.out.println("LIST OVERVIEW.FMT:");
063            for(String s : fmt) {
064                System.out.println(s);
065            }
066        } else {
067            System.out.println("Failed to get OVERVIEW.FMT");
068        }
069        NewsgroupInfo group = new NewsgroupInfo();
070        client.selectNewsgroup(newsgroup, group);
071
072        long lowArticleNumber = group.getFirstArticleLong();
073        long highArticleNumber = lowArticleNumber + 5000;
074
075        System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
076        Iterable<Article> articles = client.iterateArticleInfo(lowArticleNumber, highArticleNumber);
077
078        System.out.println("Building message thread tree...");
079        Threader threader = new Threader();
080        Article root = (Article)threader.thread(articles);
081
082        Article.printThread(root, 0);
083    }
084
085}