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 package examples.nntp;
018
019 import java.io.BufferedReader;
020 import java.io.IOException;
021 import java.io.Reader;
022 import java.util.StringTokenizer;
023
024 import org.apache.commons.net.io.DotTerminatedMessageReader;
025 import org.apache.commons.net.nntp.Article;
026 import org.apache.commons.net.nntp.NNTPClient;
027
028 /**
029 *
030 * Some convenience methods for NNTP example classes.
031 *
032 * @author Rory Winston <rwinston@checkfree.com>
033 */
034 public class NNTPUtils {
035
036 /**
037 * Given an {@link NNTPClient} instance, and an integer range of messages, return
038 * an array of {@link Article} instances.
039 * @param client
040 * @param lowArticleNumber
041 * @param highArticleNumber
042 * @return Article[] An array of Article
043 * @throws IOException
044 */
045 public static Article[] getArticleInfo(NNTPClient client, int lowArticleNumber, int highArticleNumber)
046 throws IOException {
047 Reader reader = null;
048 Article[] articles = null;
049 reader =
050 (DotTerminatedMessageReader) client.retrieveArticleInfo(
051 lowArticleNumber,
052 highArticleNumber);
053
054 if (reader != null) {
055 String theInfo = readerToString(reader);
056 StringTokenizer st = new StringTokenizer(theInfo, "\n");
057
058 // Extract the article information
059 // Mandatory format (from NNTP RFC 2980) is :
060 // Subject\tAuthor\tDate\tID\tReference(s)\tByte Count\tLine Count
061
062 int count = st.countTokens();
063 articles = new Article[count];
064 int index = 0;
065
066 while (st.hasMoreTokens()) {
067 StringTokenizer stt = new StringTokenizer(st.nextToken(), "\t");
068 Article article = new Article();
069 article.setArticleNumber(Integer.parseInt(stt.nextToken()));
070 article.setSubject(stt.nextToken());
071 article.setFrom(stt.nextToken());
072 article.setDate(stt.nextToken());
073 article.setArticleId(stt.nextToken());
074 article.addHeaderField("References", stt.nextToken());
075 articles[index++] = article;
076 }
077 } else {
078 return null;
079 }
080
081 return articles;
082 }
083
084
085 /**
086 * Convert a {@link Reader} instance to a String
087 * @param reader The Reader instance
088 * @return String
089 */
090 public static String readerToString(Reader reader) {
091 String temp = null;
092 StringBuffer sb = null;
093 BufferedReader bufReader = new BufferedReader(reader);
094
095 sb = new StringBuffer();
096 try {
097 temp = bufReader.readLine();
098 while (temp != null) {
099 sb.append(temp);
100 sb.append("\n");
101 temp = bufReader.readLine();
102 }
103 } catch (IOException e) {
104 e.printStackTrace();
105 }
106
107 return sb.toString();
108 }
109 }