/*
* 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.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;
import org.apache.commons.net.io.DotTerminatedMessageReader;
import org.apache.commons.net.nntp.Article;
import org.apache.commons.net.nntp.NNTPClient;
/**
*
* Some convenience methods for NNTP example classes.
*
* @author Rory Winston <rwinston@checkfree.com>
*/
public class NNTPUtils {
/**
* Given an {@link NNTPClient} instance, and an integer range of messages, return
* an array of {@link Article} instances.
* @param client
* @param lowArticleNumber
* @param highArticleNumber
* @return Article[] An array of Article
* @throws IOException
*/
public static List<Article> getArticleInfo(NNTPClient client, long lowArticleNumber, long highArticleNumber)
throws IOException {
Reader reader = null;
List<Article> articles = new ArrayList<Article>();
reader =
(DotTerminatedMessageReader) client.retrieveArticleInfo(
lowArticleNumber,
highArticleNumber);
if (reader != null) {
String theInfo = readerToString(reader);
StringTokenizer st = new StringTokenizer(theInfo, "\n");
// Extract the article information
// Mandatory format (from NNTP RFC 2980) is :
// Subject\tAuthor\tDate\tID\tReference(s)\tByte Count\tLine Count
int count = st.countTokens();
int index = 0;
while (st.hasMoreTokens()) {
String msg = st.nextToken();
System.out.println("Message:" + msg);
StringTokenizer stt = new StringTokenizer(msg, "\t");
try {
Article article = new Article();
article.setArticleNumber(Integer.parseInt(stt.nextToken()));
article.setSubject(stt.nextToken());
article.setFrom(stt.nextToken());
article.setDate(stt.nextToken());
article.setArticleId(stt.nextToken());
article.addHeaderField("References", stt.nextToken());
articles.add(article);
}
catch (NoSuchElementException nse) {
// ignore this message
}
}
} else {
return null;
}
return articles;
}
/**
* Convert a {@link Reader} instance to a String
* @param reader The Reader instance
* @return String
*/
public static String readerToString(Reader reader) {
String temp = null;
BufferedReader bufReader = new BufferedReader(reader);
StringBuilder sb = new StringBuilder();
try {
temp = bufReader.readLine();
while (temp != null) {
sb.append(temp);
sb.append("\n");
temp = bufReader.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
}