src/main/java/net/pterodactylus/sone/core/SoneDownloader.java

   1 /*
   2  * Sone - SoneDownloader.java - Copyright © 2010–2013 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.sone.core;
  19
  20 import java.io.InputStream;
  21 import java.net.MalformedURLException;
  22 import java.util.ArrayList;
  23 import java.util.HashSet;
  24 import java.util.List;
  25 import java.util.Set;
  26 import java.util.logging.Level;
  27 import java.util.logging.Logger;
  28
  29 import net.pterodactylus.sone.core.FreenetInterface.Fetched;
  30 import net.pterodactylus.sone.data.Album;
  31 import net.pterodactylus.sone.data.Client;
  32 import net.pterodactylus.sone.data.Image;
  33 import net.pterodactylus.sone.data.Post;
  34 import net.pterodactylus.sone.data.PostReply;
  35 import net.pterodactylus.sone.data.Profile;
  36 import net.pterodactylus.sone.data.Sone;
  37 import net.pterodactylus.sone.data.Sone.SoneStatus;
  38 import net.pterodactylus.sone.data.SoneImpl;
  39 import net.pterodactylus.sone.database.PostBuilder;
  40 import net.pterodactylus.sone.database.PostReplyBuilder;
  41 import net.pterodactylus.util.io.Closer;
  42 import net.pterodactylus.util.logging.Logging;
  43 import net.pterodactylus.util.number.Numbers;
  44 import net.pterodactylus.util.service.AbstractService;
  45 import net.pterodactylus.util.xml.SimpleXML;
  46 import net.pterodactylus.util.xml.XML;
  47
  48 import com.google.common.annotations.VisibleForTesting;
  49 import org.w3c.dom.Document;
  50
  51 import freenet.client.FetchResult;
  52 import freenet.keys.FreenetURI;
  53 import freenet.support.api.Bucket;
  54
  55 /**
  56  * The Sone downloader is responsible for download Sones as they are updated.
  57  *
  58  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  59  */
  60 public class SoneDownloader extends AbstractService {
  61
  62         /** The logger. */
  63         private static final Logger logger = Logging.getLogger(SoneDownloader.class);
  64
  65         /** The maximum protocol version. */
  66         private static final int MAX_PROTOCOL_VERSION = 0;
  67
  68         /** The core. */
  69         private final Core core;
  70
  71         /** The Freenet interface. */
  72         private final FreenetInterface freenetInterface;
  73
  74         /** The sones to update. */
  75         private final Set<Sone> sones = new HashSet<Sone>();
  76
  77         /**
  78          * Creates a new Sone downloader.
  79          *
  80          * @param core
  81          *            The core
  82          * @param freenetInterface
  83          *            The Freenet interface
  84          */
  85         public SoneDownloader(Core core, FreenetInterface freenetInterface) {
  86                 super("Sone Downloader", false);
  87                 this.core = core;
  88                 this.freenetInterface = freenetInterface;
  89         }
  90
  91         //
  92         // ACTIONS
  93         //
  94
  95         /**
  96          * Adds the given Sone to the set of Sones that will be watched for updates.
  97          *
  98          * @param sone
  99          *            The Sone to add
 100          */
 101         public void addSone(Sone sone) {
 102                 if (!sones.add(sone)) {
 103                         freenetInterface.unregisterUsk(sone);
 104                 }
 105                 freenetInterface.registerUsk(sone, this);
 106         }
 107
 108         /**
 109          * Fetches the updated Sone. This method is a callback method for
 110          * {@link FreenetInterface#registerUsk(Sone, SoneDownloader)}.
 111          *
 112          * @param sone
 113          *            The Sone to fetch
 114          */
 115         public void fetchSone(Sone sone) {
 116                 fetchSone(sone, sone.getRequestUri().sskForUSK());
 117         }
 118
 119         /**
 120          * Fetches the updated Sone. This method can be used to fetch a Sone from a
 121          * specific URI.
 122          *
 123          * @param sone
 124          *            The Sone to fetch
 125          * @param soneUri
 126          *            The URI to fetch the Sone from
 127          */
 128         public void fetchSone(Sone sone, FreenetURI soneUri) {
 129                 fetchSone(sone, soneUri, false);
 130         }
 131
 132         /**
 133          * Fetches the Sone from the given URI.
 134          *
 135          * @param sone
 136          *            The Sone to fetch
 137          * @param soneUri
 138          *            The URI of the Sone to fetch
 139          * @param fetchOnly
 140          *            {@code true} to only fetch and parse the Sone, {@code false}
 141          *            to {@link Core#updateSone(Sone) update} it in the core
 142          * @return The downloaded Sone, or {@code null} if the Sone could not be
 143          *         downloaded
 144          */
 145         public Sone fetchSone(Sone sone, FreenetURI soneUri, boolean fetchOnly) {
 146                 logger.log(Level.FINE, String.format("Starting fetch for Sone “%s” from %s…", sone, soneUri));
 147                 FreenetURI requestUri = soneUri.setMetaString(new String[] { "sone.xml" });
 148                 sone.setStatus(SoneStatus.downloading);
 149                 try {
 150                         Fetched fetchResults = freenetInterface.fetchUri(requestUri);
 151                         if (fetchResults == null) {
 152                                 /* TODO - mark Sone as bad. */
 153                                 return null;
 154                         }
 155                         logger.log(Level.FINEST, String.format("Got %d bytes back.", fetchResults.getFetchResult().size()));
 156                         Sone parsedSone = parseSone(sone, fetchResults.getFetchResult(), fetchResults.getFreenetUri());
 157                         if (parsedSone != null) {
 158                                 if (!fetchOnly) {
 159                                         parsedSone.setStatus((parsedSone.getTime() == 0) ? SoneStatus.unknown : SoneStatus.idle);
 160                                         core.updateSone(parsedSone);
 161                                         addSone(parsedSone);
 162                                 }
 163                         }
 164                         return parsedSone;
 165                 } finally {
 166                         sone.setStatus((sone.getTime() == 0) ? SoneStatus.unknown : SoneStatus.idle);
 167                 }
 168         }
 169
 170         /**
 171          * Parses a Sone from a fetch result.
 172          *
 173          * @param originalSone
 174          *            The sone to parse, or {@code null} if the Sone is yet unknown
 175          * @param fetchResult
 176          *            The fetch result
 177          * @param requestUri
 178          *            The requested URI
 179          * @return The parsed Sone, or {@code null} if the Sone could not be parsed
 180          */
 181         private Sone parseSone(Sone originalSone, FetchResult fetchResult, FreenetURI requestUri) {
 182                 logger.log(Level.FINEST, String.format("Parsing FetchResult (%d bytes, %s) for %s…", fetchResult.size(), fetchResult.getMimeType(), originalSone));
 183                 Bucket soneBucket = fetchResult.asBucket();
 184                 InputStream soneInputStream = null;
 185                 try {
 186                         soneInputStream = soneBucket.getInputStream();
 187                         Sone parsedSone = parseSone(originalSone, soneInputStream);
 188                         if (parsedSone != null) {
 189                                 parsedSone.setLatestEdition(requestUri.getEdition());
 190                                 if (requestUri.getKeyType().equals("USK")) {
 191                                         parsedSone.setRequestUri(requestUri.setMetaString(new String[0]));
 192                                 } else {
 193                                         parsedSone.setRequestUri(requestUri.setKeyType("USK").setDocName("Sone").setMetaString(new String[0]));
 194                                 }
 195                         }
 196                         return parsedSone;
 197                 } catch (Exception e1) {
 198                         logger.log(Level.WARNING, String.format("Could not parse Sone from %s!", requestUri), e1);
 199                 } finally {
 200                         Closer.close(soneInputStream);
 201                         soneBucket.free();
 202                 }
 203                 return null;
 204         }
 205
 206         /**
 207          * Parses a Sone from the given input stream and creates a new Sone from the
 208          * parsed data.
 209          *
 210          * @param originalSone
 211          *            The Sone to update
 212          * @param soneInputStream
 213          *            The input stream to parse the Sone from
 214          * @return The parsed Sone
 215          * @throws SoneException
 216          *             if a parse error occurs, or the protocol is invalid
 217          */
 218         @VisibleForTesting
 219         protected Sone parseSone(Sone originalSone, InputStream soneInputStream) throws SoneException {
 220                 /* TODO - impose a size limit? */
 221
 222                 Document document;
 223                 /* XML parsing is not thread-safe. */
 224                 synchronized (this) {
 225                         document = XML.transformToDocument(soneInputStream);
 226                 }
 227                 if (document == null) {
 228                         /* TODO - mark Sone as bad. */
 229                         logger.log(Level.WARNING, String.format("Could not parse XML for Sone %s!", originalSone));
 230                         return null;
 231                 }
 232
 233                 Sone sone = new SoneImpl(originalSone.getId(), originalSone.isLocal()).setIdentity(originalSone.getIdentity());
 234
 235                 SimpleXML soneXml;
 236                 try {
 237                         soneXml = SimpleXML.fromDocument(document);
 238                 } catch (NullPointerException npe1) {
 239                         /* for some reason, invalid XML can cause NPEs. */
 240                         logger.log(Level.WARNING, String.format("XML for Sone %s can not be parsed!", sone), npe1);
 241                         return null;
 242                 }
 243
 244                 Integer protocolVersion = null;
 245                 String soneProtocolVersion = soneXml.getValue("protocol-version", null);
 246                 if (soneProtocolVersion != null) {
 247                         protocolVersion = Numbers.safeParseInteger(soneProtocolVersion);
 248                 }
 249                 if (protocolVersion == null) {
 250                         logger.log(Level.INFO, "No protocol version found, assuming 0.");
 251                         protocolVersion = 0;
 252                 }
 253
 254                 if (protocolVersion < 0) {
 255                         logger.log(Level.WARNING, String.format("Invalid protocol version: %d! Not parsing Sone.", protocolVersion));
 256                         return null;
 257                 }
 258
 259                 /* check for valid versions. */
 260                 if (protocolVersion > MAX_PROTOCOL_VERSION) {
 261                         logger.log(Level.WARNING, String.format("Unknown protocol version: %d! Not parsing Sone.", protocolVersion));
 262                         return null;
 263                 }
 264
 265                 String soneTime = soneXml.getValue("time", null);
 266                 if (soneTime == null) {
 267                         /* TODO - mark Sone as bad. */
 268                         logger.log(Level.WARNING, String.format("Downloaded time for Sone %s was null!", sone));
 269                         return null;
 270                 }
 271                 try {
 272                         sone.setTime(Long.parseLong(soneTime));
 273                 } catch (NumberFormatException nfe1) {
 274                         /* TODO - mark Sone as bad. */
 275                         logger.log(Level.WARNING, String.format("Downloaded Sone %s with invalid time: %s", sone, soneTime));
 276                         return null;
 277                 }
 278
 279                 SimpleXML clientXml = soneXml.getNode("client");
 280                 if (clientXml != null) {
 281                         String clientName = clientXml.getValue("name", null);
 282                         String clientVersion = clientXml.getValue("version", null);
 283                         if ((clientName == null) || (clientVersion == null)) {
 284                                 logger.log(Level.WARNING, String.format("Download Sone %s with client XML but missing name or version!", sone));
 285                                 return null;
 286                         }
 287                         sone.setClient(new Client(clientName, clientVersion));
 288                 }
 289
 290                 String soneRequestUri = soneXml.getValue("request-uri", null);
 291                 if (soneRequestUri != null) {
 292                         try {
 293                                 sone.setRequestUri(new FreenetURI(soneRequestUri));
 294                         } catch (MalformedURLException mue1) {
 295                                 /* TODO - mark Sone as bad. */
 296                                 logger.log(Level.WARNING, String.format("Downloaded Sone %s has invalid request URI: %s", sone, soneRequestUri), mue1);
 297                                 return null;
 298                         }
 299                 }
 300
 301                 if (originalSone.getInsertUri() != null) {
 302                         sone.setInsertUri(originalSone.getInsertUri());
 303                 }
 304
 305                 SimpleXML profileXml = soneXml.getNode("profile");
 306                 if (profileXml == null) {
 307                         /* TODO - mark Sone as bad. */
 308                         logger.log(Level.WARNING, String.format("Downloaded Sone %s has no profile!", sone));
 309                         return null;
 310                 }
 311
 312                 /* parse profile. */
 313                 String profileFirstName = profileXml.getValue("first-name", null);
 314                 String profileMiddleName = profileXml.getValue("middle-name", null);
 315                 String profileLastName = profileXml.getValue("last-name", null);
 316                 Integer profileBirthDay = Numbers.safeParseInteger(profileXml.getValue("birth-day", null));
 317                 Integer profileBirthMonth = Numbers.safeParseInteger(profileXml.getValue("birth-month", null));
 318                 Integer profileBirthYear = Numbers.safeParseInteger(profileXml.getValue("birth-year", null));
 319                 Profile profile = new Profile(sone).setFirstName(profileFirstName).setMiddleName(profileMiddleName).setLastName(profileLastName);
 320                 profile.setBirthDay(profileBirthDay).setBirthMonth(profileBirthMonth).setBirthYear(profileBirthYear);
 321                 /* avatar is processed after images are loaded. */
 322                 String avatarId = profileXml.getValue("avatar", null);
 323
 324                 /* parse profile fields. */
 325                 SimpleXML profileFieldsXml = profileXml.getNode("fields");
 326                 if (profileFieldsXml != null) {
 327                         for (SimpleXML fieldXml : profileFieldsXml.getNodes("field")) {
 328                                 String fieldName = fieldXml.getValue("field-name", null);
 329                                 String fieldValue = fieldXml.getValue("field-value", "");
 330                                 if (fieldName == null) {
 331                                         logger.log(Level.WARNING, String.format("Downloaded profile field for Sone %s with missing data! Name: %s, Value: %s", sone, fieldName, fieldValue));
 332                                         return null;
 333                                 }
 334                                 try {
 335                                         profile.addField(fieldName.trim()).setValue(fieldValue);
 336                                 } catch (IllegalArgumentException iae1) {
 337                                         logger.log(Level.WARNING, String.format("Duplicate field: %s", fieldName), iae1);
 338                                         return null;
 339                                 }
 340                         }
 341                 }
 342
 343                 /* parse posts. */
 344                 SimpleXML postsXml = soneXml.getNode("posts");
 345                 Set<Post> posts = new HashSet<Post>();
 346                 if (postsXml == null) {
 347                         /* TODO - mark Sone as bad. */
 348                         logger.log(Level.WARNING, String.format("Downloaded Sone %s has no posts!", sone));
 349                 } else {
 350                         for (SimpleXML postXml : postsXml.getNodes("post")) {
 351                                 String postId = postXml.getValue("id", null);
 352                                 String postRecipientId = postXml.getValue("recipient", null);
 353                                 String postTime = postXml.getValue("time", null);
 354                                 String postText = postXml.getValue("text", null);
 355                                 if ((postId == null) || (postTime == null) || (postText == null)) {
 356                                         /* TODO - mark Sone as bad. */
 357                                         logger.log(Level.WARNING, String.format("Downloaded post for Sone %s with missing data! ID: %s, Time: %s, Text: %s", sone, postId, postTime, postText));
 358                                         return null;
 359                                 }
 360                                 try {
 361                                         PostBuilder postBuilder = core.postBuilder();
 362                                         /* TODO - parse time correctly. */
 363                                         postBuilder.withId(postId).from(sone.getId()).withTime(Long.parseLong(postTime)).withText(postText);
 364                                         if ((postRecipientId != null) && (postRecipientId.length() == 43)) {
 365                                                 postBuilder.to(postRecipientId);
 366                                         }
 367                                         posts.add(postBuilder.build());
 368                                 } catch (NumberFormatException nfe1) {
 369                                         /* TODO - mark Sone as bad. */
 370                                         logger.log(Level.WARNING, String.format("Downloaded post for Sone %s with invalid time: %s", sone, postTime));
 371                                         return null;
 372                                 }
 373                         }
 374                 }
 375
 376                 /* parse replies. */
 377                 SimpleXML repliesXml = soneXml.getNode("replies");
 378                 Set<PostReply> replies = new HashSet<PostReply>();
 379                 if (repliesXml == null) {
 380                         /* TODO - mark Sone as bad. */
 381                         logger.log(Level.WARNING, String.format("Downloaded Sone %s has no replies!", sone));
 382                 } else {
 383                         for (SimpleXML replyXml : repliesXml.getNodes("reply")) {
 384                                 String replyId = replyXml.getValue("id", null);
 385                                 String replyPostId = replyXml.getValue("post-id", null);
 386                                 String replyTime = replyXml.getValue("time", null);
 387                                 String replyText = replyXml.getValue("text", null);
 388                                 if ((replyId == null) || (replyPostId == null) || (replyTime == null) || (replyText == null)) {
 389                                         /* TODO - mark Sone as bad. */
 390                                         logger.log(Level.WARNING, String.format("Downloaded reply for Sone %s with missing data! ID: %s, Post: %s, Time: %s, Text: %s", sone, replyId, replyPostId, replyTime, replyText));
 391                                         return null;
 392                                 }
 393                                 try {
 394                                         PostReplyBuilder postReplyBuilder = core.postReplyBuilder();
 395                                         /* TODO - parse time correctly. */
 396                                         postReplyBuilder.withId(replyId).from(sone.getId()).to(replyPostId).withTime(Long.parseLong(replyTime)).withText(replyText);
 397                                         replies.add(postReplyBuilder.build());
 398                                 } catch (NumberFormatException nfe1) {
 399                                         /* TODO - mark Sone as bad. */
 400                                         logger.log(Level.WARNING, String.format("Downloaded reply for Sone %s with invalid time: %s", sone, replyTime));
 401                                         return null;
 402                                 }
 403                         }
 404                 }
 405
 406                 /* parse liked post IDs. */
 407                 SimpleXML likePostIdsXml = soneXml.getNode("post-likes");
 408                 Set<String> likedPostIds = new HashSet<String>();
 409                 if (likePostIdsXml == null) {
 410                         /* TODO - mark Sone as bad. */
 411                         logger.log(Level.WARNING, String.format("Downloaded Sone %s has no post likes!", sone));
 412                 } else {
 413                         for (SimpleXML likedPostIdXml : likePostIdsXml.getNodes("post-like")) {
 414                                 String postId = likedPostIdXml.getValue();
 415                                 likedPostIds.add(postId);
 416                         }
 417                 }
 418
 419                 /* parse liked reply IDs. */
 420                 SimpleXML likeReplyIdsXml = soneXml.getNode("reply-likes");
 421                 Set<String> likedReplyIds = new HashSet<String>();
 422                 if (likeReplyIdsXml == null) {
 423                         /* TODO - mark Sone as bad. */
 424                         logger.log(Level.WARNING, String.format("Downloaded Sone %s has no reply likes!", sone));
 425                 } else {
 426                         for (SimpleXML likedReplyIdXml : likeReplyIdsXml.getNodes("reply-like")) {
 427                                 String replyId = likedReplyIdXml.getValue();
 428                                 likedReplyIds.add(replyId);
 429                         }
 430                 }
 431
 432                 /* parse albums. */
 433                 SimpleXML albumsXml = soneXml.getNode("albums");
 434                 List<Album> topLevelAlbums = new ArrayList<Album>();
 435                 if (albumsXml != null) {
 436                         for (SimpleXML albumXml : albumsXml.getNodes("album")) {
 437                                 String id = albumXml.getValue("id", null);
 438                                 String parentId = albumXml.getValue("parent", null);
 439                                 String title = albumXml.getValue("title", null);
 440                                 String description = albumXml.getValue("description", "");
 441                                 String albumImageId = albumXml.getValue("album-image", null);
 442                                 if ((id == null) || (title == null)) {
 443                                         logger.log(Level.WARNING, String.format("Downloaded Sone %s contains invalid album!", sone));
 444                                         return null;
 445                                 }
 446                                 Album parent = null;
 447                                 if (parentId != null) {
 448                                         parent = core.getAlbum(parentId, false);
 449                                         if (parent == null) {
 450                                                 logger.log(Level.WARNING, String.format("Downloaded Sone %s has album with invalid parent!", sone));
 451                                                 return null;
 452                                         }
 453                                 }
 454                                 Album album = core.getAlbum(id).setSone(sone).modify().setTitle(title).setDescription(description).update();
 455                                 if (parent != null) {
 456                                         parent.addAlbum(album);
 457                                 } else {
 458                                         topLevelAlbums.add(album);
 459                                 }
 460                                 SimpleXML imagesXml = albumXml.getNode("images");
 461                                 if (imagesXml != null) {
 462                                         for (SimpleXML imageXml : imagesXml.getNodes("image")) {
 463                                                 String imageId = imageXml.getValue("id", null);
 464                                                 String imageCreationTimeString = imageXml.getValue("creation-time", null);
 465                                                 String imageKey = imageXml.getValue("key", null);
 466                                                 String imageTitle = imageXml.getValue("title", null);
 467                                                 String imageDescription = imageXml.getValue("description", "");
 468                                                 String imageWidthString = imageXml.getValue("width", null);
 469                                                 String imageHeightString = imageXml.getValue("height", null);
 470                                                 if ((imageId == null) || (imageCreationTimeString == null) || (imageKey == null) || (imageTitle == null) || (imageWidthString == null) || (imageHeightString == null)) {
 471                                                         logger.log(Level.WARNING, String.format("Downloaded Sone %s contains invalid images!", sone));
 472                                                         return null;
 473                                                 }
 474                                                 long creationTime = Numbers.safeParseLong(imageCreationTimeString, 0L);
 475                                                 int imageWidth = Numbers.safeParseInteger(imageWidthString, 0);
 476                                                 int imageHeight = Numbers.safeParseInteger(imageHeightString, 0);
 477                                                 if ((imageWidth < 1) || (imageHeight < 1)) {
 478                                                         logger.log(Level.WARNING, String.format("Downloaded Sone %s contains image %s with invalid dimensions (%s, %s)!", sone, imageId, imageWidthString, imageHeightString));
 479                                                         return null;
 480                                                 }
 481                                                 Image image = core.getImage(imageId).modify().setSone(sone).setKey(imageKey).setCreationTime(creationTime).update();
 482                                                 image = image.modify().setTitle(imageTitle).setDescription(imageDescription).update();
 483                                                 image = image.modify().setWidth(imageWidth).setHeight(imageHeight).update();
 484                                                 album.addImage(image);
 485                                         }
 486                                 }
 487                                 album.modify().setAlbumImage(albumImageId).update();
 488                         }
 489                 }
 490
 491                 /* process avatar. */
 492                 if (avatarId != null) {
 493                         profile.setAvatar(core.getImage(avatarId, false));
 494                 }
 495
 496                 /* okay, apparently everything was parsed correctly. Now import. */
 497                 /* atomic setter operation on the Sone. */
 498                 synchronized (sone) {
 499                         sone.setProfile(profile);
 500                         sone.setPosts(posts);
 501                         sone.setReplies(replies);
 502                         sone.setLikePostIds(likedPostIds);
 503                         sone.setLikeReplyIds(likedReplyIds);
 504                         for (Album album : topLevelAlbums) {
 505                                 sone.getRootAlbum().addAlbum(album);
 506                         }
 507                 }
 508
 509                 return sone;
 510         }
 511
 512         //
 513         // SERVICE METHODS
 514         //
 515
 516         /**
 517          * {@inheritDoc}
 518          */
 519         @Override
 520         protected void serviceStop() {
 521                 for (Sone sone : sones) {
 522                         freenetInterface.unregisterUsk(sone);
 523                 }
 524         }
 525
 526         public class FetchSoneWithUri implements Runnable {
 527
 528                 private final Sone sone;
 529
 530                 public FetchSoneWithUri(Sone sone) {
 531                         this.sone = sone;
 532                 }
 533
 534                 @Override
 535                 public void run() {
 536                         fetchSone(sone, sone.getRequestUri());
 537                 }
 538
 539         }
 540
 541         public class FetchSone implements Runnable {
 542
 543                 private final Sone sone;
 544
 545                 public FetchSone(Sone sone) {
 546                         this.sone = sone;
 547                 }
 548
 549                 @Override
 550                 public void run() {
 551                         fetchSone(sone);
 552                 }
 553
 554         }
 555
 556 }