src/org/sonews/daemon/command/HelpCommand.java
author František Kučera <franta-hg@frantovo.cz>
Thu Jul 05 13:19:19 2012 +0200 (2012-07-05)
changeset 119 f5b57e221e38
parent 35 ed84c8bdd87b
permissions -rwxr-xr-x
mezery, tabulátory
     1 /*
     2  *   SONEWS News Server
     3  *   see AUTHORS for the list of contributors
     4  *
     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.
     9  *
    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.
    14  *
    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/>.
    17  */
    18 
    19 package org.sonews.daemon.command;
    20 
    21 import java.io.IOException;
    22 import java.util.Set;
    23 import org.sonews.daemon.CommandSelector;
    24 import org.sonews.daemon.NNTPConnection;
    25 import org.sonews.util.io.Resource;
    26 
    27 /**
    28  * This command provides a short summary of the commands that are
    29  * understood by this implementation of the server. The help text will
    30  * be presented as a multi-line data block following the 100 response
    31  * code (taken from RFC).
    32  * @author Christian Lins
    33  * @since sonews/0.5.0
    34  */
    35 public class HelpCommand implements Command
    36 {
    37 
    38 	@Override
    39 	public boolean hasFinished()
    40 	{
    41 		return true;
    42 	}
    43 
    44 	@Override
    45 	public String impliedCapability()
    46 	{
    47 		return null;
    48 	}
    49 
    50 	@Override
    51 	public boolean isStateful()
    52 	{
    53 		return true;
    54 	}
    55 
    56 	@Override
    57 	public String[] getSupportedCommandStrings()
    58 	{
    59 		return new String[] {"HELP"};
    60 	}
    61 
    62 	@Override
    63 	public void processLine(NNTPConnection conn, final String line, byte[] raw)
    64 		throws IOException
    65 	{
    66 		final String[] command = line.split(" ");
    67 		conn.println("100 help text follows");
    68 
    69 		if (line.length() <= 1) {
    70 			final String[] help = Resource.getAsString("helpers/helptext", true).split("\n");
    71 			for (String hstr : help) {
    72 				conn.println(hstr);
    73 			}
    74 
    75 			Set<String> commandNames = CommandSelector.getCommandNames();
    76 			for (String cmdName : commandNames) {
    77 				conn.println(cmdName);
    78 			}
    79 		} else {
    80 			Command cmd = CommandSelector.getInstance().get(command[1]);
    81 			if (cmd instanceof HelpfulCommand) {
    82 				conn.println(((HelpfulCommand) cmd).getHelpString());
    83 			} else {
    84 				conn.println("No further help information available.");
    85 			}
    86 		}
    87 
    88 		conn.println(".");
    89 	}
    90 }