MessageThreading.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package examples.nntp;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.SocketException;

import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.nntp.Article;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NewsgroupInfo;
import org.apache.commons.net.nntp.Threader;


public class MessageThreading {
    public MessageThreading() {
    }
    
    public static void main(String[] args) throws SocketException, IOException {
        
        if (args.length != 3)
            usage();
        
        String hostname = args[0];
        String user = args[1];
        String password = args[2];
        
        NNTPClient client = new NNTPClient();
        client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
        client.connect(hostname);
        
        if(!client.authenticate(user, password)) {
            System.out.println("Authentication failed for user " + user + "!");
            System.exit(1);
        }
        
        NewsgroupInfo group = new NewsgroupInfo();
        client.selectNewsgroup("comp.lang.lisp", group);
        
        int lowArticleNumber = group.getFirstArticle();
        int highArticleNumber = lowArticleNumber + 100;
        
        System.out.println("Retrieving articles between [" + lowArticleNumber + "] and [" + highArticleNumber + "]");
        Article[] articles = NNTPUtils.getArticleInfo(client, lowArticleNumber, highArticleNumber);
        
        System.out.println("Building message thread tree...");
        Threader threader = new Threader();
        Article root = (Article)threader.thread(articles);
        
        Article.printThread(root, 0);
        
    }
    
    
    public static void usage() {
        System.out.println("Usage: MessageThreading <hostname> <user> <password>");
        System.exit(0);
    }
}