package examples.nntp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
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 Article[] getArticleInfo(NNTPClient client, int lowArticleNumber, int highArticleNumber)
throws IOException {
Reader reader = null;
Article[] articles = null;
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();
articles = new Article[count];
int index = 0;
while (st.hasMoreTokens()) {
StringTokenizer stt = new StringTokenizer(st.nextToken(), "\t");
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[index++] = article;
}
} 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;
StringBuffer sb = null;
BufferedReader bufReader = new BufferedReader(reader);
sb = new StringBuffer();
try {
temp = bufReader.readLine();
while (temp != null) {
sb.append(temp);
sb.append("\n");
temp = bufReader.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
}