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
018package org.apache.commons.net.examples.nntp;
019
020import java.io.IOException;
021import java.io.PrintWriter;
022import java.net.SocketException;
023
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 static void main(final String[] args) throws SocketException, IOException {
035
036        if (args.length != 2 && args.length != 4) {
037            System.out.println("Usage: MessageThreading <hostname> <groupname> [<user> <password>]");
038            return;
039        }
040
041        final String hostname = args[0];
042        final String newsgroup = args[1];
043
044        final NNTPClient client = new NNTPClient();
045        client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
046        client.connect(hostname);
047
048        if (args.length == 4) { // Optional auth
049            final String user = args[2];
050            final String password = args[3];
051            if (!client.authenticate(user, password)) {
052                System.out.println("Authentication failed for user " + user + "!");
053                System.exit(1);
054            }
055        }
056
057        final String fmt[] = client.listOverviewFmt();
058        if (fmt != null) {
059            System.out.println("LIST OVERVIEW.FMT:");
060            for (final String s : fmt) {
061                System.out.println(s);
062            }
063        } else {
064            System.out.println("Failed to get OVERVIEW.FMT");
065        }
066        final NewsgroupInfo group = new NewsgroupInfo();
067        client.selectNewsgroup(newsgroup, group);
068
069        final long lowArticleNumber = group.getFirstArticleLong();
070        final long highArticleNumber = lowArticleNumber + 5000;
071
072        System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
073        final Iterable<Article> articles = client.iterateArticleInfo(lowArticleNumber, highArticleNumber);
074
075        System.out.println("Building message thread tree...");
076        final Threader threader = new Threader();
077        final Article root = (Article) threader.thread(articles);
078
079        Article.printThread(root, 0);
080    }
081
082    public MessageThreading() {
083    }
084
085}