Some work on XDAEMON command.
3 * see AUTHORS for the list of contributors
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6 * it under the terms of the GNU General Public License as published by
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10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
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19 package org.sonews.daemon.command;
21 import java.io.IOException;
22 import org.sonews.daemon.NNTPConnection;
23 import org.sonews.storage.Article;
24 import org.sonews.storage.Channel;
25 import org.sonews.storage.StorageBackendException;
28 * Class handling the NEXT and LAST command.
29 * @author Christian Lins
30 * @author Dennis Schwerdel
33 public class NextPrevCommand implements Command
37 public String[] getSupportedCommandStrings()
39 return new String[] {"NEXT", "PREV"};
43 public boolean hasFinished()
49 public String impliedCapability()
55 public boolean isStateful()
61 public void processLine(NNTPConnection conn, final String line, byte[] raw)
62 throws IOException, StorageBackendException
64 final Article currA = conn.getCurrentArticle();
65 final Channel currG = conn.getCurrentChannel();
68 conn.println("420 no current article has been selected");
73 conn.println("412 no newsgroup selected");
77 final String[] command = line.split(" ");
79 if (command[0].equalsIgnoreCase("NEXT")) {
80 selectNewArticle(conn, currA, currG, 1);
81 } else if (command[0].equalsIgnoreCase("PREV")) {
82 selectNewArticle(conn, currA, currG, -1);
84 conn.println("500 internal server error");
88 private void selectNewArticle(NNTPConnection conn, Article article, Channel grp,
90 throws IOException, StorageBackendException
92 assert article != null;
94 article = grp.getArticle(grp.getIndexOf(article) + delta);
96 if (article == null) {
97 conn.println("421 no next article in this group");
99 conn.setCurrentArticle(article);
100 conn.println("223 " + conn.getCurrentChannel().getIndexOf(article)
101 + " " + article.getMessageID()
102 + " article retrieved - request text separately");