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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package net.java.sip.communicator.plugin.irccommands.command;
import net.java.sip.communicator.impl.protocol.irc.*;
/**
* Implementation of the /msg command. Send a targeted private message.
*
* @author Danny van Heumen
*/
public class Msg implements Command
{
/**
* Index of start of nick and message parameters.
*/
private static final int END_OF_MSG_COMMAND_PREFIX = 5;
/**
* Instance of the IRC connection.
*/
private IrcConnection connection;
/**
* Initialization of the /msg command.
*
* @param provider the provider instance
* @param connection the connection instance
*/
public Msg(final ProtocolProviderServiceIrcImpl provider,
final IrcConnection connection)
{
if (connection == null)
{
throw new IllegalArgumentException("connection cannot be null");
}
this.connection = connection;
}
/**
* Execute the command: send the message to the specified target.
*
* @param line the command message line
* @param source the originating channel/user from which the message was
* sent.
*/
@Override
public void execute(final String source, final String line)
{
if (line.length() < END_OF_MSG_COMMAND_PREFIX)
{
throw new IllegalArgumentException(
"Both target nick and message are missing.");
}
final String part = line.substring(5);
int endOfNick = part.indexOf(' ');
if (endOfNick == -1)
{
throw new IllegalArgumentException("Invalid private message "
+ "format: Expecting both nick and message. Message was "
+ "not sent.");
}
final String target = part.substring(0, endOfNick);
if (target.length() == 0)
{
throw new IllegalArgumentException("Invalid private message "
+ "format: Zero-length nick is not allowed. Message was not "
+ "sent.");
}
final String message = part.substring(endOfNick + 1);
if (message.length() == 0)
{
throw new IllegalArgumentException("Invalid private message "
+ "format: Zero-length message is not allowed. Message was not "
+ "sent.");
}
this.connection.getClient().message(target, message);
}
/**
* Usage instructions.
*/
@Override
public String help()
{
return "Usage: /msg <user> <message>";
}
}
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