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3 * see AUTHORS for the list of contributors
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
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
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package org.sonews.daemon.command;
20 import java.io.IOException;
21 import java.util.List;
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
24 import java.util.regex.PatternSyntaxException;
25 import org.sonews.daemon.NNTPConnection;
26 import org.sonews.storage.Group;
27 import org.sonews.storage.StorageBackendException;
28 import org.sonews.util.Log;
31 * Class handling the LIST command.
32 * @author Christian Lins
33 * @author Dennis Schwerdel
36 public class ListCommand implements Command {
39 public String[] getSupportedCommandStrings() {
40 return new String[]{"LIST"};
44 public boolean hasFinished() {
49 public String impliedCapability() {
54 public boolean isStateful() {
59 public void processLine(NNTPConnection conn, final String line, byte[] raw)
60 throws IOException, StorageBackendException {
61 final String[] command = line.split(" ");
63 if (command.length >= 2) {
64 if (command[1].equalsIgnoreCase("OVERVIEW.FMT")) {
65 conn.println("215 information follows");
66 conn.println("Subject:\nFrom:\nDate:\nMessage-ID:\nReferences:\nBytes:\nLines:\nXref");
68 } else if (command[1].equalsIgnoreCase("NEWSGROUPS")) {
69 conn.println("215 information follows");
70 final List<Group> list = Group.getAll();
71 for (Group g : list) {
72 conn.println(g.getName() + "\t" + "-");
75 } else if (command[1].equalsIgnoreCase("SUBSCRIPTIONS")) {
76 conn.println("215 information follows");
78 } else if (command[1].equalsIgnoreCase("EXTENSIONS")) {
79 conn.println("202 Supported NNTP extensions.");
80 conn.println("LISTGROUP");
81 conn.println("XDAEMON");
84 } else if (command[1].equalsIgnoreCase("ACTIVE")) {
85 String pattern = command.length == 2
86 ? null : command[2].replace("*", "\\w*");
87 printGroupInfo(conn, pattern);
89 conn.println("500 unknown argument to LIST command");
92 printGroupInfo(conn, null);
96 private void printGroupInfo(NNTPConnection conn, String pattern)
97 throws IOException, StorageBackendException {
98 final List<Group> groups = Group.getAll();
100 conn.println("215 list of newsgroups follows");
101 for (Group g : groups) {
103 Matcher matcher = pattern == null
104 ? null : Pattern.compile(pattern).matcher(g.getName());
106 && (matcher == null || matcher.find())) {
107 String writeable = g.isWriteable() ? " y" : " n";
108 // Indeed first the higher article number then the lower
109 conn.println(g.getName() + " " + g.getLastArticleNumber() + " "
110 + g.getFirstArticleNumber() + writeable);
112 } catch (PatternSyntaxException ex) {
113 Log.get().info(ex.toString());
118 conn.println("500 server backend malfunction");