src/main/java/net/pterodactylus/irc/Connection.java

   1 /*
   2  * XdccDownloader - Connection.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.irc;
  19
  20 import static com.google.common.base.Preconditions.checkState;
  21
  22 import java.io.BufferedReader;
  23 import java.io.Closeable;
  24 import java.io.EOFException;
  25 import java.io.IOException;
  26 import java.io.InputStream;
  27 import java.io.InputStreamReader;
  28 import java.io.OutputStream;
  29 import java.io.UnsupportedEncodingException;
  30 import java.net.InetAddress;
  31 import java.net.Socket;
  32 import java.net.UnknownHostException;
  33 import java.util.ArrayList;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Set;
  37 import java.util.logging.Level;
  38 import java.util.logging.Logger;
  39 import javax.net.SocketFactory;
  40
  41 import net.pterodactylus.irc.event.ChannelJoined;
  42 import net.pterodactylus.irc.event.ChannelLeft;
  43 import net.pterodactylus.irc.event.ChannelMessageReceived;
  44 import net.pterodactylus.irc.event.ChannelNicknames;
  45 import net.pterodactylus.irc.event.ChannelNotJoined;
  46 import net.pterodactylus.irc.event.ChannelNotJoined.Reason;
  47 import net.pterodactylus.irc.event.ChannelNoticeReceived;
  48 import net.pterodactylus.irc.event.ChannelTopic;
  49 import net.pterodactylus.irc.event.ClientQuit;
  50 import net.pterodactylus.irc.event.ConnectionClosed;
  51 import net.pterodactylus.irc.event.ConnectionEstablished;
  52 import net.pterodactylus.irc.event.ConnectionFailed;
  53 import net.pterodactylus.irc.event.DccAcceptReceived;
  54 import net.pterodactylus.irc.event.DccSendReceived;
  55 import net.pterodactylus.irc.event.MotdReceived;
  56 import net.pterodactylus.irc.event.NicknameChanged;
  57 import net.pterodactylus.irc.event.NicknameInUseReceived;
  58 import net.pterodactylus.irc.event.NoNicknameGivenReceived;
  59 import net.pterodactylus.irc.event.PrivateMessageReceived;
  60 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  61 import net.pterodactylus.irc.event.UnknownReplyReceived;
  62 import net.pterodactylus.irc.util.RandomNickname;
  63
  64 import com.google.common.base.Optional;
  65 import com.google.common.collect.Maps;
  66 import com.google.common.collect.Sets;
  67 import com.google.common.eventbus.EventBus;
  68 import com.google.common.io.Closeables;
  69 import com.google.common.primitives.Ints;
  70 import com.google.common.primitives.Longs;
  71 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  72 import com.google.common.util.concurrent.Service;
  73
  74 /**
  75  * A connection to an IRC server.
  76  *
  77  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  78  */
  79 public class Connection extends AbstractExecutionThreadService implements Service {
  80
  81         /* The logger. */
  82         private static final Logger logger = Logger.getLogger(Connection.class.getName());
  83
  84         /** The event bus. */
  85         private final EventBus eventBus;
  86
  87         /** The socket factory. */
  88         private final SocketFactory socketFactory;
  89
  90         /** The hostname to connect to. */
  91         private final String hostname;
  92
  93         /** The port to connect to. */
  94         private final int port;
  95
  96         /** The nickname chooser. */
  97         private NicknameChooser nicknameChooser = new NicknameChooser() {
  98
  99                 @Override
 100                 public String getNickname() {
 101                         return RandomNickname.get();
 102                 }
 103         };
 104
 105         /** The nickname. */
 106         private String nickname = null;
 107
 108         /** The username. */
 109         private Optional<String> username = Optional.absent();
 110
 111         /** The real name. */
 112         private Optional<String> realName = Optional.absent();
 113
 114         /** The optional password for the connection. */
 115         private Optional<String> password = Optional.absent();
 116
 117         /** The connection handler. */
 118         private ConnectionHandler connectionHandler;
 119
 120         /** Whether the connection has already been established. */
 121         private boolean established;
 122
 123         /**
 124          * Creates a new connection.
 125          *
 126          * @param eventBus
 127          *              The event bus
 128          * @param socketFactory
 129          *              The socket factory
 130          * @param hostname
 131          *              The hostname of the IRC server
 132          * @param port
 133          *              The port number of the IRC server
 134          */
 135         public Connection(EventBus eventBus, SocketFactory socketFactory, String hostname, int port) {
 136                 this.eventBus = eventBus;
 137                 this.socketFactory = socketFactory;
 138                 this.hostname = hostname;
 139                 this.port = port;
 140         }
 141
 142         //
 143         // ACCESSORS
 144         //
 145
 146         /**
 147          * Returns whether this connection has already been established.
 148          *
 149          * @return {@code true} as long as this connection is established, {@code
 150          *         false} otherwise
 151          */
 152         public boolean established() {
 153                 return established;
 154         }
 155
 156         /**
 157          * Returns the nickname that is currently in use by this connection. The
 158          * nickname is only available once the connection has been {@link #start()}ed.
 159          *
 160          * @return The current nickname
 161          */
 162         public String nickname() {
 163                 return nickname;
 164         }
 165
 166         //
 167         // MUTATORS
 168         //
 169
 170         /**
 171          * Sets the nickname chooser. The nickname chooser is only used during the
 172          * creation of the connection.
 173          *
 174          * @param nicknameChooser
 175          *              The nickname chooser
 176          * @return This connection
 177          */
 178         public Connection nicknameChooser(NicknameChooser nicknameChooser) {
 179                 this.nicknameChooser = nicknameChooser;
 180                 return this;
 181         }
 182
 183         /**
 184          * Sets the username to use.
 185          *
 186          * @param username
 187          *              The username to use
 188          * @return This connection
 189          */
 190         public Connection username(String username) {
 191                 this.username = Optional.fromNullable(username);
 192                 return this;
 193         }
 194
 195         /**
 196          * Sets the real name to use.
 197          *
 198          * @param realName
 199          *              The real name to use
 200          * @return This connection
 201          */
 202         public Connection realName(String realName) {
 203                 this.realName = Optional.fromNullable(realName);
 204                 return this;
 205         }
 206
 207         /**
 208          * Sets the optional password for the connection.
 209          *
 210          * @param password
 211          *              The password for the connection
 212          * @return This connection
 213          */
 214         public Connection password(String password) {
 215                 this.password = Optional.fromNullable(password);
 216                 return this;
 217         }
 218
 219         //
 220         // ACTIONS
 221         //
 222
 223         /**
 224          * Checks whether the given source is the client represented by this
 225          * connection.
 226          *
 227          * @param source
 228          *              The source to check
 229          * @return {@code true} if this connection represents the given source, {@code
 230          *         false} otherwise
 231          */
 232         public boolean isSource(Source source) {
 233                 return source.nick().isPresent() && source.nick().get().equals(nickname);
 234         }
 235
 236         /**
 237          * Joins the given channel.
 238          *
 239          * @param channel
 240          *              The channel to join
 241          * @throws IOException
 242          *              if an I/O error occurs
 243          */
 244         public void joinChannel(final String channel) throws IOException {
 245                 connectionHandler.sendCommand("JOIN", channel);
 246         }
 247
 248         /**
 249          * Sends a message to the given recipient, which may be a channel or another
 250          * nickname.
 251          *
 252          * @param recipient
 253          *              The recipient of the message
 254          * @param message
 255          *              The message
 256          * @throws IOException
 257          *              if an I/O error occurs
 258          */
 259         public void sendMessage(String recipient, String message) throws IOException {
 260                 connectionHandler.sendCommand("PRIVMSG", recipient, message);
 261         }
 262
 263         /**
 264          * Sends a DCC RESUME request to the given recipient.
 265          *
 266          * @param recipient
 267          *              The recipient of the request
 268          * @param filename
 269          *              The name of the file to resume
 270          * @param port
 271          *              The port number from the original DCC SEND request
 272          * @param position
 273          *              The position at which to resume the transfer
 274          * @throws IOException
 275          *              if an I/O error occurs
 276          */
 277         public void sendDccResume(String recipient, String filename, int port, long position) throws IOException {
 278                 connectionHandler.sendCommand("PRIVMSG", recipient, String.format("\u0001DCC RESUME %s %d %d\u0001", filename, port, position));
 279         }
 280
 281         /**
 282          * Closes this connection.
 283          *
 284          * @throws IOException
 285          *              if an I/O error occurs
 286          */
 287         public void close() throws IOException {
 288                 connectionHandler.close();
 289         }
 290
 291         //
 292         // ABSTRACTEXECUTIONTHREADSERVICE METHODS
 293         //
 294
 295         @Override
 296         protected void startUp() throws IllegalStateException {
 297                 checkState(username.isPresent(), "username must be set");
 298                 checkState(realName.isPresent(), "realName must be set");
 299         }
 300
 301         @Override
 302         protected void run() {
 303
 304                 /* connect to remote socket. */
 305                 try {
 306                         Socket socket = socketFactory.createSocket(hostname, port);
 307                         connectionHandler = new ConnectionHandler(socket.getInputStream(), socket.getOutputStream());
 308
 309                         /* register connection. */
 310                         if (password.isPresent()) {
 311                                 connectionHandler.sendCommand("PASSWORD", password.get());
 312                         }
 313                         connectionHandler.sendCommand("USER", username.get(), "8", "*", realName.get());
 314                         nickname = nicknameChooser.getNickname();
 315                         connectionHandler.sendCommand("NICK", nickname);
 316
 317                 } catch (IOException ioe1) {
 318                         eventBus.post(new ConnectionFailed(this, ioe1));
 319                         return;
 320                 }
 321
 322                 /* now read replies and react. */
 323                 try {
 324                         /* some status variables. */
 325                         int oldConnectionStatus = 0;
 326                         int connectionStatus = 0;
 327                         boolean connected = true;
 328                         StringBuilder motd = new StringBuilder();
 329                         Set<Nickname> nicks = Sets.newHashSet();
 330
 331                         /* server modes. */
 332                         Map<String, String> nickPrefixes = Maps.newHashMap();
 333                         Set<Character> channelTypes = Sets.newHashSet();
 334
 335                         while (connected) {
 336                                 Reply reply = connectionHandler.readReply();
 337                                 logger.finest(String.format("<< %s", reply));
 338                                 String command = reply.command();
 339                                 List<String> parameters = reply.parameters();
 340
 341                                 /* most common events. */
 342                                 if (command.equalsIgnoreCase("PRIVMSG")) {
 343                                         String recipient = parameters.get(0);
 344                                         String message = parameters.get(1);
 345                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 346                                                 /* CTCP! */
 347                                                 handleCtcp(reply.source().get(), message);
 348                                         } else if (!channelTypes.contains(recipient.charAt(0))) {
 349                                                 eventBus.post(new PrivateMessageReceived(this, reply.source().get(), message));
 350                                         } else {
 351                                                 eventBus.post(new ChannelMessageReceived(this, recipient, reply.source().get(), message));
 352                                         }
 353
 354                                 } else if (command.equalsIgnoreCase("NOTICE")) {
 355                                         String recipient = parameters.get(0);
 356                                         String message = parameters.get(1);
 357                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 358                                                 /* CTCP! */
 359                                                 handleCtcp(reply.source().get(), message);
 360                                         } else if (!channelTypes.contains(recipient.charAt(0))) {
 361                                                 eventBus.post(new PrivateNoticeReceived(this, reply));
 362                                         } else {
 363                                                 eventBus.post(new ChannelNoticeReceived(this, reply.source().get(), recipient, message));
 364                                         }
 365
 366                                 /* 43x replies are for nick change errors. */
 367                                 } else if (command.equals("431")) {
 368                                         eventBus.post(new NoNicknameGivenReceived(this, reply));
 369                                 } else if (command.equals("433")) {
 370                                         if (connectionStatus == 0) {
 371                                                 nickname = nicknameChooser.getNickname();
 372                                                 connectionHandler.sendCommand("NICK", nickname);
 373                                         } else {
 374                                                 eventBus.post(new NicknameInUseReceived(this, reply));
 375                                         }
 376
 377                                 /* client stuff. */
 378                                 } else if (command.equalsIgnoreCase("NICK")) {
 379                                         eventBus.post(new NicknameChanged(this, reply.source().get(), parameters.get(0)));
 380
 381                                 /* channel stuff. */
 382                                 } else if (command.equalsIgnoreCase("JOIN")) {
 383                                         eventBus.post(new ChannelJoined(this, parameters.get(0), reply.source().get()));
 384                                 } else if (command.equals("331")) {
 385                                         /* no topic is set. */
 386                                 } else if (command.equals("332")) {
 387                                         eventBus.post(new ChannelTopic(this, parameters.get(1), parameters.get(2)));
 388                                 } else if (command.equals("353")) {
 389                                         for (String nickname : parameters.get(3).split(" ")) {
 390                                                 if (nickPrefixes.containsKey(nickname.substring(0, 1))) {
 391                                                         nicks.add(new Nickname(nickname.substring(1), nickname.substring(0, 1)));
 392                                                 } else {
 393                                                         nicks.add(new Nickname(nickname, ""));
 394                                                 }
 395                                         }
 396                                 } else if (command.equals("366")) {
 397                                         eventBus.post(new ChannelNicknames(this, parameters.get(1), nicks));
 398                                         nicks.clear();
 399                                 } else if (command.equalsIgnoreCase("PART")) {
 400                                         eventBus.post(new ChannelLeft(this, parameters.get(0), reply.source().get(), getOptional(parameters, 1)));
 401                                 } else if (command.equalsIgnoreCase("QUIT")) {
 402                                         eventBus.post(new ClientQuit(this, reply.source().get(), parameters.get(0)));
 403
 404                                 /* common channel join errors. */
 405                                 } else if (command.equals("474")) {
 406                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.banned));
 407                                 } else if (command.equals("473")) {
 408                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.inviteOnly));
 409                                 } else if (command.equals("475")) {
 410                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.badChannelKey));
 411
 412                                 /* basic connection housekeeping. */
 413                                 } else if (command.equalsIgnoreCase("PING")) {
 414                                         connectionHandler.sendCommand("PONG", getOptional(parameters, 0), getOptional(parameters, 1));
 415
 416                                 /* replies 001-004 don’t hold information but they have to be sent on a successful connection. */
 417                                 } else if (command.equals("001")) {
 418                                         connectionStatus |= 0x01;
 419                                 } else if (command.equals("002")) {
 420                                         connectionStatus |= 0x02;
 421                                 } else if (command.equals("003")) {
 422                                         connectionStatus |= 0x04;
 423                                 } else if (command.equals("004")) {
 424                                         connectionStatus |= 0x08;
 425
 426                                 /* 005 originally was a bounce message, now used to transmit useful information about the server. */
 427                                 } else if (command.equals("005")) {
 428                                         for (String parameter : parameters) {
 429                                                 if (parameter.startsWith("PREFIX=")) {
 430                                                         int openParen = parameter.indexOf('(');
 431                                                         int closeParen = parameter.indexOf(')');
 432                                                         if ((openParen != -1) && (closeParen != -1)) {
 433                                                                 for (int modeCharacterIndex = 1; modeCharacterIndex < (closeParen - openParen); ++modeCharacterIndex) {
 434                                                                         char modeCharacter = parameter.charAt(openParen + modeCharacterIndex);
 435                                                                         char modeSymbol = parameter.charAt(closeParen + modeCharacterIndex);
 436                                                                         nickPrefixes.put(String.valueOf(modeSymbol), String.valueOf(modeCharacter));
 437                                                                 }
 438                                                                 logger.fine(String.format("Parsed Prefixes: %s", nickPrefixes));
 439                                                         }
 440                                                 } else if (parameter.startsWith("CHANTYPES=")) {
 441                                                         for (int typeIndex = 10; typeIndex < parameter.length(); ++typeIndex) {
 442                                                                 channelTypes.add(parameter.charAt(typeIndex));
 443                                                         }
 444                                                         logger.fine(String.format("Parsed Channel Types: %s", channelTypes));
 445                                                 }
 446                                         }
 447
 448                                 /* 375, 372, and 376 handle the server’s MOTD. */
 449                                 } else if (command.equals("375")) {
 450                                         /* MOTD starts. */
 451                                         motd.append(parameters.get(1)).append('\n');
 452                                 } else if (command.equals("372")) {
 453                                         motd.append(parameters.get(1)).append('\n');
 454                                 } else if (command.equals("376")) {
 455                                         motd.append(parameters.get(1)).append('\n');
 456                                         eventBus.post(new MotdReceived(this, motd.toString()));
 457                                         motd.setLength(0);
 458
 459                                 /* okay, everything else. */
 460                                 } else {
 461                                         eventBus.post(new UnknownReplyReceived(this, reply));
 462                                 }
 463
 464                                 if ((connectionStatus == 0x0f) && (connectionStatus != oldConnectionStatus)) {
 465                                         /* connection succeeded! */
 466                                         established = true;
 467                                         eventBus.post(new ConnectionEstablished(this));
 468                                 }
 469                                 oldConnectionStatus = connectionStatus;
 470                         }
 471                         eventBus.post(new ConnectionClosed(this));
 472                 } catch (IOException ioe1) {
 473                         logger.log(Level.WARNING, "I/O error", ioe1);
 474                         eventBus.post(new ConnectionClosed(this, ioe1));
 475                 } finally {
 476                         established = false;
 477                         logger.info("Closing Connection.");
 478                         try {
 479                                 Closeables.close(connectionHandler, true);
 480                         } catch (IOException ioe1) {
 481                                 /* will not be thrown. */
 482                         }
 483                 }
 484
 485         }
 486
 487         //
 488         // PRIVATE METHODS
 489         //
 490
 491         /**
 492          * Handles a CTCP message.
 493          *
 494          * @param client
 495          *              The client sending the message
 496          * @param message
 497          *              The message
 498          */
 499         private void handleCtcp(Source client, String message) {
 500                 String[] messageWords = message.substring(1, message.length() - 1).split(" +");
 501                 String ctcpCommand = messageWords[0];
 502                 if (ctcpCommand.equalsIgnoreCase("DCC")) {
 503                         if (messageWords[1].equalsIgnoreCase("SEND")) {
 504                                 Optional<InetAddress> inetAddress = parseInetAddress(messageWords[3]);
 505                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[4]));
 506                                 long fileSize = Optional.fromNullable(Longs.tryParse(messageWords[5])).or(-1L);
 507                                 if (inetAddress.isPresent() && port.isPresent()) {
 508                                         eventBus.post(new DccSendReceived(this, client, messageWords[2], inetAddress.get(), port.get(), fileSize));
 509                                 } else {
 510                                         logger.warning(String.format("Received malformed DCC SEND: “%s”", message));
 511                                 }
 512                         } else if (messageWords[1].equalsIgnoreCase("ACCEPT")) {
 513                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[3]));
 514                                 long position = Optional.fromNullable(Longs.tryParse(messageWords[4])).or(-1L);
 515                                 if (port.isPresent()) {
 516                                         eventBus.post(new DccAcceptReceived(this, client, messageWords[2], port.get(), position));
 517                                 } else {
 518                                         logger.warning(String.format("Received malformed DCC ACCEPT: “%s”", message));
 519                                 }
 520                         }
 521                 }
 522         }
 523
 524         /**
 525          * Returns an item from the list, or {@link Optional#absent()} if the list is
 526          * shorter than required for the given index.
 527          *
 528          * @param list
 529          *              The list to get an item from
 530          * @param index
 531          *              The index of the item
 532          * @param <T>
 533          *              The type of the list items
 534          * @return This list item wrapped in an {@link Optional}, or {@link
 535          *         Optional#absent()} if the list is not long enough
 536          */
 537         private static <T> Optional<T> getOptional(List<T> list, int index) {
 538                 if (index < list.size()) {
 539                         return Optional.fromNullable(list.get(index));
 540                 }
 541                 return Optional.absent();
 542         }
 543
 544         /**
 545          * Parses the given {@code ip} and returns an {@link InetAddress} from it.
 546          *
 547          * @param ip
 548          *              The IP to parse
 549          * @return The parsed inet address, or {@link Optional#absent()} if no inet
 550          *         address could be parsed
 551          */
 552         private Optional<InetAddress> parseInetAddress(String ip) {
 553                 Long ipNumber = Longs.tryParse(ip);
 554                 if (ipNumber == null) {
 555                         return Optional.absent();
 556                 }
 557
 558                 StringBuilder hostname = new StringBuilder(15);
 559                 hostname.append((ipNumber >>> 24) & 0xff).append('.');
 560                 hostname.append((ipNumber >>> 16) & 0xff).append('.');
 561                 hostname.append((ipNumber >>> 8) & 0xff).append('.');
 562                 hostname.append(ipNumber & 0xff);
 563                 try {
 564                         return Optional.of(InetAddress.getByName(hostname.toString()));
 565                 } catch (UnknownHostException uhe1) {
 566                         return Optional.absent();
 567                 }
 568         }
 569
 570         /** Handles input and output for the connection. */
 571         private class ConnectionHandler implements Closeable {
 572
 573                 /** The output stream of the connection. */
 574                 private final OutputStream outputStream;
 575
 576                 /** The input stream of the connection. */
 577                 private final BufferedReader inputStreamReader;
 578
 579                 /**
 580                  * Creates a new connection handler for the given input stream and output
 581                  * stream.
 582                  *
 583                  * @param inputStream
 584                  *              The input stream of the connection
 585                  * @param outputStream
 586                  *              The output stream of the connection
 587                  * @throws UnsupportedEncodingException
 588                  *              if the encoding (currently “UTF-8”) is not valid
 589                  */
 590                 private ConnectionHandler(InputStream inputStream, OutputStream outputStream) throws UnsupportedEncodingException {
 591                         this.outputStream = outputStream;
 592                         inputStreamReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
 593                 }
 594
 595                 //
 596                 // ACTIONS
 597                 //
 598
 599                 /**
 600                  * Sends a command with the given parameters, skipping all {@link
 601                  * Optional#absent()} optionals.
 602                  *
 603                  * @param command
 604                  *              The command to send
 605                  * @param parameters
 606                  *              The parameters
 607                  * @throws IOException
 608                  *              if an I/O error occurs
 609                  */
 610                 public void sendCommand(String command, Optional<String>... parameters) throws IOException {
 611                         List<String> setParameters = new ArrayList<String>();
 612                         for (Optional<String> maybeSetParameter : parameters) {
 613                                 if (maybeSetParameter.isPresent()) {
 614                                         setParameters.add(maybeSetParameter.get());
 615                                 }
 616                         }
 617                         sendCommand(command, setParameters.toArray(new String[setParameters.size()]));
 618                 }
 619
 620                 /**
 621                  * Sends a command with the given parameters.
 622                  *
 623                  * @param command
 624                  *              The command to send
 625                  * @param parameters
 626                  *              The parameters of the command
 627                  * @throws IOException
 628                  *              if an I/O error occurs
 629                  * @throws IllegalArgumentException
 630                  *              if any parameter but that last contains a space character
 631                  */
 632                 public void sendCommand(String command, String... parameters) throws IOException, IllegalArgumentException {
 633                         StringBuilder commandBuilder = new StringBuilder();
 634
 635                         commandBuilder.append(command);
 636                         for (int parameterIndex = 0; parameterIndex < parameters.length; ++parameterIndex) {
 637                                 String parameter = parameters[parameterIndex];
 638                                 /* space is only allowed in the last parameter. */
 639                                 commandBuilder.append(' ');
 640                                 if (parameter.contains(" ")) {
 641                                         if (parameterIndex == (parameters.length - 1)) {
 642                                                 commandBuilder.append(':');
 643                                         } else {
 644                                                 throw new IllegalArgumentException(String.format("parameter “%s” must not contain space!", parameter));
 645                                         }
 646                                 }
 647                                 commandBuilder.append(parameter);
 648                         }
 649
 650                         logger.finest(String.format(">> %s", commandBuilder));
 651                         outputStream.write((commandBuilder.toString() + "\r\n").getBytes("UTF-8"));
 652                         outputStream.flush();
 653                 }
 654
 655                 /**
 656                  * Reads a line of reply from the connection.
 657                  *
 658                  * @return The reply
 659                  * @throws IOException
 660                  *              if an I/O error occurs
 661                  * @throws EOFException
 662                  *              if EOF was reached
 663                  */
 664                 public Reply readReply() throws IOException, EOFException {
 665                         String line = inputStreamReader.readLine();
 666                         if (line == null) {
 667                                 throw new EOFException();
 668                         }
 669
 670                         return Reply.parseLine(line);
 671                 }
 672
 673                 //
 674                 // CLOSEABLE METHODS
 675                 //
 676
 677                 @Override
 678                 public void close() throws IOException {
 679                         Closeables.close(outputStream, true);
 680                         Closeables.close(inputStreamReader, true);
 681                 }
 682
 683         }
 684
 685 }