src/de/todesbaum/jsite/application/ProjectInserter.java

   1 /*
   2  * jSite - a tool for uploading websites into Freenet
   3  * Copyright (C) 2006 David Roden
   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 2 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 package de.todesbaum.jsite.application;
  21
  22 import java.io.ByteArrayInputStream;
  23 import java.io.ByteArrayOutputStream;
  24 import java.io.File;
  25 import java.io.FileInputStream;
  26 import java.io.FileOutputStream;
  27 import java.io.IOException;
  28 import java.io.InputStream;
  29 import java.util.ArrayList;
  30 import java.util.Arrays;
  31 import java.util.HashMap;
  32 import java.util.HashSet;
  33 import java.util.Iterator;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Set;
  37 import java.util.Map.Entry;
  38 import java.util.logging.Level;
  39 import java.util.logging.Logger;
  40 import java.util.zip.ZipEntry;
  41 import java.util.zip.ZipOutputStream;
  42
  43 import de.todesbaum.jsite.gui.FileScanner;
  44 import de.todesbaum.jsite.gui.FileScannerListener;
  45 import de.todesbaum.util.freenet.fcp2.Client;
  46 import de.todesbaum.util.freenet.fcp2.ClientPutComplexDir;
  47 import de.todesbaum.util.freenet.fcp2.Connection;
  48 import de.todesbaum.util.freenet.fcp2.DirectFileEntry;
  49 import de.todesbaum.util.freenet.fcp2.FileEntry;
  50 import de.todesbaum.util.freenet.fcp2.Message;
  51 import de.todesbaum.util.freenet.fcp2.RedirectFileEntry;
  52 import de.todesbaum.util.freenet.fcp2.Verbosity;
  53 import de.todesbaum.util.io.Closer;
  54 import de.todesbaum.util.io.ReplacingOutputStream;
  55 import de.todesbaum.util.io.StreamCopier;
  56
  57 /**
  58  * Manages project inserts.
  59  *
  60  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  61  */
  62 public class ProjectInserter implements FileScannerListener, Runnable {
  63
  64         /** The logger. */
  65         private static final Logger logger = Logger.getLogger(ProjectInserter.class.getName());
  66
  67         /** Random number for FCP instances. */
  68         private static final int random = (int) (Math.random() * Integer.MAX_VALUE);
  69
  70         /** Counter for FCP connection identifier. */
  71         private static int counter = 0;
  72
  73         /** The list of insert listeners. */
  74         private List<InsertListener> insertListeners = new ArrayList<InsertListener>();
  75
  76         /** The freenet interface. */
  77         protected Freenet7Interface freenetInterface;
  78
  79         /** The project to insert. */
  80         protected Project project;
  81
  82         /** The file scanner. */
  83         private FileScanner fileScanner;
  84
  85         /** Object used for synchronization. */
  86         protected final Object lockObject = new Object();
  87
  88         /** The temp directory. */
  89         private String tempDirectory;
  90
  91         /**
  92          * Adds a listener to the list of registered listeners.
  93          *
  94          * @param insertListener
  95          *            The listener to add
  96          */
  97         public void addInsertListener(InsertListener insertListener) {
  98                 insertListeners.add(insertListener);
  99         }
 100
 101         /**
 102          * Removes a listener from the list of registered listeners.
 103          *
 104          * @param insertListener
 105          *            The listener to remove
 106          */
 107         public void removeInsertListener(InsertListener insertListener) {
 108                 insertListeners.remove(insertListener);
 109         }
 110
 111         /**
 112          * Notifies all listeners that the project insert has started.
 113          *
 114          * @see InsertListener#projectInsertStarted(Project)
 115          */
 116         protected void fireProjectInsertStarted() {
 117                 for (InsertListener insertListener : insertListeners) {
 118                         insertListener.projectInsertStarted(project);
 119                 }
 120         }
 121
 122         /**
 123          * Notifies all listeners that the insert has generated a URI.
 124          *
 125          * @see InsertListener#projectURIGenerated(Project, String)
 126          * @param uri
 127          *            The generated URI
 128          */
 129         protected void fireProjectURIGenerated(String uri) {
 130                 for (InsertListener insertListener : insertListeners) {
 131                         insertListener.projectURIGenerated(project, uri);
 132                 }
 133         }
 134
 135         /**
 136          * Notifies all listeners that the insert has made some progress.
 137          *
 138          * @see InsertListener#projectUploadFinished(Project)
 139          */
 140         protected void fireProjectUploadFinished() {
 141                 for (InsertListener insertListener : insertListeners) {
 142                         insertListener.projectUploadFinished(project);
 143                 }
 144         }
 145
 146         /**
 147          * Notifies all listeners that the insert has made some progress.
 148          *
 149          * @see InsertListener#projectInsertProgress(Project, int, int, int, int,
 150          *      boolean)
 151          * @param succeeded
 152          *            The number of succeeded blocks
 153          * @param failed
 154          *            The number of failed blocks
 155          * @param fatal
 156          *            The number of fatally failed blocks
 157          * @param total
 158          *            The total number of blocks
 159          * @param finalized
 160          *            <code>true</code> if the total number of blocks has already
 161          *            been finalized, <code>false</code> otherwise
 162          */
 163         protected void fireProjectInsertProgress(int succeeded, int failed, int fatal, int total, boolean finalized) {
 164                 for (InsertListener insertListener : insertListeners) {
 165                         insertListener.projectInsertProgress(project, succeeded, failed, fatal, total, finalized);
 166                 }
 167         }
 168
 169         /**
 170          * Notifies all listeners the project insert has finished.
 171          *
 172          * @see InsertListener#projectInsertFinished(Project, boolean, Throwable)
 173          * @param success
 174          *            <code>true</code> if the project was inserted successfully,
 175          *            <code>false</code> if it failed
 176          * @param cause
 177          *            The cause of the failure, if any
 178          */
 179         protected void fireProjectInsertFinished(boolean success, Throwable cause) {
 180                 for (InsertListener insertListener : insertListeners) {
 181                         insertListener.projectInsertFinished(project, success, cause);
 182                 }
 183         }
 184
 185         /**
 186          * Sets the project to insert.
 187          *
 188          * @param project
 189          *            The project to insert
 190          */
 191         public void setProject(Project project) {
 192                 this.project = project;
 193         }
 194
 195         /**
 196          * Sets the freenet interface to use.
 197          *
 198          * @param freenetInterface
 199          *            The freenet interface to use
 200          */
 201         public void setFreenetInterface(Freenet7Interface freenetInterface) {
 202                 this.freenetInterface = freenetInterface;
 203         }
 204
 205         /**
 206          * Sets the temp directory to use.
 207          *
 208          * @param tempDirectory
 209          *            The temp directory to use, or {@code null} to use the system
 210          *            default
 211          */
 212         public void setTempDirectory(String tempDirectory) {
 213                 this.tempDirectory = tempDirectory;
 214         }
 215
 216         /**
 217          * Starts the insert.
 218          */
 219         public void start() {
 220                 fileScanner = new FileScanner(project);
 221                 fileScanner.addFileScannerListener(this);
 222                 new Thread(fileScanner).start();
 223         }
 224
 225         /**
 226          * Creates an input stream that delivers the given file, replacing edition
 227          * tokens in the file’s content, if necessary.
 228          *
 229          * @param filename
 230          *            The name of the file
 231          * @param fileOption
 232          *            The file options
 233          * @param edition
 234          *            The current edition
 235          * @param length
 236          *            An array containing a single long which is used to
 237          *            <em>return</em> the final length of the file, after all
 238          *            replacements
 239          * @return The input stream for the file
 240          * @throws IOException
 241          *             if an I/O error occurs
 242          */
 243         private InputStream createFileInputStream(String filename, FileOption fileOption, int edition, long[] length) throws IOException {
 244                 File file = new File(project.getLocalPath(), filename);
 245                 length[0] = file.length();
 246                 if (!fileOption.getReplaceEdition()) {
 247                         return new FileInputStream(file);
 248                 }
 249                 ByteArrayOutputStream filteredByteOutputStream = new ByteArrayOutputStream(Math.min(Integer.MAX_VALUE, (int) length[0]));
 250                 ReplacingOutputStream outputStream = new ReplacingOutputStream(filteredByteOutputStream);
 251                 FileInputStream fileInput = new FileInputStream(file);
 252                 try {
 253                         outputStream.addReplacement("$[EDITION]", String.valueOf(edition));
 254                         outputStream.addReplacement("$[URI]", project.getFinalRequestURI(0));
 255                         for (int index = 1; index <= fileOption.getEditionRange(); index++) {
 256                                 outputStream.addReplacement("$[URI+" + index + "]", project.getFinalRequestURI(index));
 257                                 outputStream.addReplacement("$[EDITION+" + index + "]", String.valueOf(edition + index));
 258                         }
 259                         StreamCopier.copy(fileInput, outputStream, length[0]);
 260                 } finally {
 261                         Closer.close(fileInput);
 262                         Closer.close(outputStream);
 263                         Closer.close(filteredByteOutputStream);
 264                 }
 265                 byte[] filteredBytes = filteredByteOutputStream.toByteArray();
 266                 length[0] = filteredBytes.length;
 267                 return new ByteArrayInputStream(filteredBytes);
 268         }
 269
 270         /**
 271          * Creates an input stream for a container.
 272          *
 273          * @param containerFiles
 274          *            All container definitions
 275          * @param containerName
 276          *            The name of the container to create
 277          * @param edition
 278          *            The current edition
 279          * @param containerLength
 280          *            An array containing a single long which is used to
 281          *            <em>return</em> the final length of the container stream,
 282          *            after all replacements
 283          * @return The input stream for the container
 284          * @throws IOException
 285          *             if an I/O error occurs
 286          */
 287         private InputStream createContainerInputStream(Map<String, List<String>> containerFiles, String containerName, int edition, long[] containerLength) throws IOException {
 288                 File tempFile = File.createTempFile("jsite", ".zip", (tempDirectory == null) ? null : new File(tempDirectory));
 289                 tempFile.deleteOnExit();
 290                 FileOutputStream fileOutputStream = new FileOutputStream(tempFile);
 291                 ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream);
 292                 try {
 293                         for (String filename : containerFiles.get(containerName)) {
 294                                 File dataFile = new File(project.getLocalPath(), filename);
 295                                 if (dataFile.exists()) {
 296                                         ZipEntry zipEntry = new ZipEntry(filename);
 297                                         long[] fileLength = new long[1];
 298                                         InputStream wrappedInputStream = createFileInputStream(filename, project.getFileOption(filename), edition, fileLength);
 299                                         try {
 300                                                 zipOutputStream.putNextEntry(zipEntry);
 301                                                 StreamCopier.copy(wrappedInputStream, zipOutputStream, fileLength[0]);
 302                                         } finally {
 303                                                 zipOutputStream.closeEntry();
 304                                                 wrappedInputStream.close();
 305                                         }
 306                                 }
 307                         }
 308                 } finally {
 309                         zipOutputStream.closeEntry();
 310                         Closer.close(zipOutputStream);
 311                         Closer.close(fileOutputStream);
 312                 }
 313
 314                 containerLength[0] = tempFile.length();
 315                 return new FileInputStream(tempFile);
 316         }
 317
 318         /**
 319          * Creates a file entry suitable for handing in to
 320          * {@link ClientPutComplexDir#addFileEntry(FileEntry)}.
 321          *
 322          * @param filename
 323          *            The name of the file to insert
 324          * @param edition
 325          *            The current edition
 326          * @param containerFiles
 327          *            The container definitions
 328          * @return A file entry for the given file
 329          */
 330         private FileEntry createFileEntry(String filename, int edition, Map<String, List<String>> containerFiles) {
 331                 FileEntry fileEntry = null;
 332                 FileOption fileOption = project.getFileOption(filename);
 333                 if (filename.startsWith("/container/:")) {
 334                         String containerName = filename.substring("/container/:".length());
 335                         try {
 336                                 long[] containerLength = new long[1];
 337                                 InputStream containerInputStream = createContainerInputStream(containerFiles, containerName, edition, containerLength);
 338                                 fileEntry = new DirectFileEntry(containerName + ".zip", "application/zip", containerInputStream, containerLength[0]);
 339                         } catch (IOException ioe1) {
 340                                 /* ignore, null is returned. */
 341                         }
 342                 } else {
 343                         if (fileOption.isInsert()) {
 344                                 try {
 345                                         long[] fileLength = new long[1];
 346                                         InputStream fileEntryInputStream = createFileInputStream(filename, fileOption, edition, fileLength);
 347                                         fileEntry = new DirectFileEntry(filename, project.getFileOption(filename).getMimeType(), fileEntryInputStream, fileLength[0]);
 348                                 } catch (IOException ioe1) {
 349                                         /* ignore, null is returned. */
 350                                 }
 351                         } else {
 352                                 if (fileOption.isInsertRedirect()) {
 353                                         fileEntry = new RedirectFileEntry(filename, fileOption.getMimeType(), fileOption.getCustomKey());
 354                                 }
 355                         }
 356                 }
 357                 return fileEntry;
 358         }
 359
 360         /**
 361          * Creates container definitions.
 362          *
 363          * @param files
 364          *            The list of all files
 365          * @param containers
 366          *            The list of all containers
 367          * @param containerFiles
 368          *            Empty map that will be filled with container definitions
 369          */
 370         private void createContainers(List<String> files, List<String> containers, Map<String, List<String>> containerFiles) {
 371                 for (String filename : new ArrayList<String>(files)) {
 372                         FileOption fileOption = project.getFileOption(filename);
 373                         String containerName = fileOption.getContainer();
 374                         if (!containerName.equals("")) {
 375                                 if (!containers.contains(containerName)) {
 376                                         containers.add(containerName);
 377                                         containerFiles.put(containerName, new ArrayList<String>());
 378                                         /* hmm. looks like a hack to me. */
 379                                         files.add("/container/:" + containerName);
 380                                 }
 381                                 containerFiles.get(containerName).add(filename);
 382                                 files.remove(filename);
 383                         }
 384                 }
 385         }
 386
 387         /**
 388          * Validates the given project. The project will be checked for any invalid
 389          * conditions, such as invalid insert or request keys, missing path names,
 390          * missing default file, and so on.
 391          *
 392          * @param project
 393          *            The project to check
 394          * @return The encountered warnings and errors
 395          */
 396         public static CheckReport validateProject(Project project) {
 397                 CheckReport checkReport = new CheckReport();
 398                 if ((project.getLocalPath() == null) || (project.getLocalPath().trim().length() == 0)) {
 399                         checkReport.addIssue("error.no-local-path", true);
 400                 }
 401                 if ((project.getPath() == null) || (project.getPath().trim().length() == 0)) {
 402                         checkReport.addIssue("error.no-path", true);
 403                 }
 404                 if ((project.getIndexFile() == null) || (project.getIndexFile().length() == 0)) {
 405                         checkReport.addIssue("warning.empty-index", false);
 406                 } else {
 407                         File indexFile = new File(project.getLocalPath(), project.getIndexFile());
 408                         if (!indexFile.exists()) {
 409                                 checkReport.addIssue("error.index-missing", true);
 410                         }
 411                 }
 412                 String indexFile = project.getIndexFile();
 413                 boolean hasIndexFile = (indexFile != null);
 414                 if (hasIndexFile && !project.getFileOption(indexFile).getContainer().equals("")) {
 415                         checkReport.addIssue("warning.container-index", false);
 416                 }
 417                 List<String> allowedIndexContentTypes = Arrays.asList("text/html", "application/xhtml+xml");
 418                 if (hasIndexFile && !allowedIndexContentTypes.contains(project.getFileOption(indexFile).getMimeType())) {
 419                         checkReport.addIssue("warning.index-not-html", false);
 420                 }
 421                 Map<String, FileOption> fileOptions = project.getFileOptions();
 422                 Set<Entry<String, FileOption>> fileOptionEntries = fileOptions.entrySet();
 423                 boolean insert = false;
 424                 for (Entry<String, FileOption> fileOptionEntry : fileOptionEntries) {
 425                         String fileName = fileOptionEntry.getKey();
 426                         FileOption fileOption = fileOptionEntry.getValue();
 427                         insert |= fileOption.isInsert() || fileOption.isInsertRedirect();
 428                         if (fileName.equals(project.getIndexFile()) && !fileOption.isInsert() && !fileOption.isInsertRedirect()) {
 429                                 checkReport.addIssue("error.index-not-inserted", true);
 430                         }
 431                         if (!fileOption.isInsert() && fileOption.isInsertRedirect() && ((fileOption.getCustomKey().length() == 0) || "CHK@".equals(fileOption.getCustomKey()))) {
 432                                 checkReport.addIssue("error.no-custom-key", true, fileName);
 433                         }
 434                 }
 435                 if (!insert) {
 436                         checkReport.addIssue("error.no-files-to-insert", true);
 437                 }
 438                 Set<String> fileNames = new HashSet<String>();
 439                 for (Entry<String, FileOption> fileOptionEntry : fileOptionEntries) {
 440                         FileOption fileOption = fileOptionEntry.getValue();
 441                         if (!fileOption.isInsert() && !fileOption.isInsertRedirect()) {
 442                                 logger.log(Level.FINEST, "Ignoring {0}.", fileOptionEntry.getKey());
 443                                 continue;
 444                         }
 445                         String fileName = fileOptionEntry.getKey();
 446                         if (fileOption.hasChangedName()) {
 447                                 fileName = fileOption.getChangedName();
 448                         }
 449                         logger.log(Level.FINEST, "Adding “{0}” for {1}.", new Object[] { fileName, fileOptionEntry.getKey() });
 450                         if (!fileNames.add(fileName)) {
 451                                 checkReport.addIssue("error.duplicate-file", true, fileName);
 452                         }
 453                 }
 454                 return checkReport;
 455         }
 456
 457         /**
 458          * {@inheritDoc}
 459          */
 460         public void run() {
 461                 fireProjectInsertStarted();
 462                 List<String> files = fileScanner.getFiles();
 463
 464                 /* create connection to node */
 465                 Connection connection = freenetInterface.getConnection("project-insert-" + random + counter++);
 466                 connection.setTempDirectory(tempDirectory);
 467                 boolean connected = false;
 468                 Throwable cause = null;
 469                 try {
 470                         connected = connection.connect();
 471                 } catch (IOException e1) {
 472                         cause = e1;
 473                 }
 474
 475                 if (!connected) {
 476                         fireProjectInsertFinished(false, cause);
 477                         return;
 478                 }
 479
 480                 Client client = new Client(connection);
 481
 482                 /* create containers */
 483                 final List<String> containers = new ArrayList<String>();
 484                 final Map<String, List<String>> containerFiles = new HashMap<String, List<String>>();
 485                 createContainers(files, containers, containerFiles);
 486
 487                 /* collect files */
 488                 int edition = project.getEdition();
 489                 String dirURI = "USK@" + project.getInsertURI() + "/" + project.getPath() + "/" + edition + "/";
 490                 ClientPutComplexDir putDir = new ClientPutComplexDir("dir-" + counter++, dirURI, tempDirectory);
 491                 if ((project.getIndexFile() != null) && (project.getIndexFile().length() > 0)) {
 492                         putDir.setDefaultName(project.getIndexFile());
 493                 }
 494                 putDir.setVerbosity(Verbosity.ALL);
 495                 putDir.setMaxRetries(-1);
 496                 putDir.setEarlyEncode(false);
 497                 for (String filename : files) {
 498                         FileEntry fileEntry = createFileEntry(filename, edition, containerFiles);
 499                         if (fileEntry != null) {
 500                                 try {
 501                                         putDir.addFileEntry(fileEntry);
 502                                 } catch (IOException ioe1) {
 503                                         fireProjectInsertFinished(false, ioe1);
 504                                         return;
 505                                 }
 506                         }
 507                 }
 508
 509                 /* start request */
 510                 try {
 511                         client.execute(putDir);
 512                 } catch (IOException ioe1) {
 513                         fireProjectInsertFinished(false, ioe1);
 514                         return;
 515                 }
 516
 517                 /* parse progress and success messages */
 518                 String finalURI = null;
 519                 boolean firstMessage = true;
 520                 boolean success = false;
 521                 boolean finished = false;
 522                 boolean disconnected = false;
 523                 while (!finished) {
 524                         Message message = client.readMessage();
 525                         finished = (message == null) || (disconnected = client.isDisconnected());
 526                         if (firstMessage) {
 527                                 fireProjectUploadFinished();
 528                                 firstMessage = false;
 529                         }
 530                         logger.log(Level.FINE, "Received message: " + message);
 531                         if (!finished) {
 532                                 @SuppressWarnings("null")
 533                                 String messageName = message.getName();
 534                                 if ("URIGenerated".equals(messageName)) {
 535                                         finalURI = message.get("URI");
 536                                         fireProjectURIGenerated(finalURI);
 537                                 }
 538                                 if ("SimpleProgress".equals(messageName)) {
 539                                         int total = Integer.parseInt(message.get("Total"));
 540                                         int succeeded = Integer.parseInt(message.get("Succeeded"));
 541                                         int fatal = Integer.parseInt(message.get("FatallyFailed"));
 542                                         int failed = Integer.parseInt(message.get("Failed"));
 543                                         boolean finalized = Boolean.parseBoolean(message.get("FinalizedTotal"));
 544                                         fireProjectInsertProgress(succeeded, failed, fatal, total, finalized);
 545                                 }
 546                                 success = "PutSuccessful".equals(messageName);
 547                                 finished = success || "PutFailed".equals(messageName) || messageName.endsWith("Error");
 548                         }
 549                 }
 550
 551                 /* post-insert work */
 552                 if (success) {
 553                         @SuppressWarnings("null")
 554                         String editionPart = finalURI.substring(finalURI.lastIndexOf('/') + 1);
 555                         int newEdition = Integer.parseInt(editionPart);
 556                         project.setEdition(newEdition);
 557                         project.setLastInsertionTime(System.currentTimeMillis());
 558                 }
 559                 fireProjectInsertFinished(success, disconnected ? new IOException("Connection terminated") : null);
 560         }
 561
 562         //
 563         // INTERFACE FileScannerListener
 564         //
 565
 566         /**
 567          * {@inheritDoc}
 568          */
 569         public void fileScannerFinished(FileScanner fileScanner) {
 570                 if (!fileScanner.isError()) {
 571                         new Thread(this).start();
 572                 } else {
 573                         fireProjectInsertFinished(false, null);
 574                 }
 575                 fileScanner.removeFileScannerListener(this);
 576         }
 577
 578         /**
 579          * Container class that collects all warnings and errors that occured during
 580          * {@link ProjectInserter#validateProject(Project) project validation}.
 581          *
 582          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 583          */
 584         public static class CheckReport implements Iterable<Issue> {
 585
 586                 /** The issures that occured. */
 587                 private final List<Issue> issues = new ArrayList<Issue>();
 588
 589                 /**
 590                  * Adds an issue.
 591                  *
 592                  * @param issue
 593                  *            The issue to add
 594                  */
 595                 public void addIssue(Issue issue) {
 596                         issues.add(issue);
 597                 }
 598
 599                 /**
 600                  * Creates an {@link Issue} from the given error key and fatality flag
 601                  * and {@link #addIssue(Issue) adds} it.
 602                  *
 603                  * @param errorKey
 604                  *            The error key
 605                  * @param fatal
 606                  *            {@code true} if the error is fatal, {@code false} if only
 607                  *            a warning should be generated
 608                  * @param parameters
 609                  *            Any additional parameters
 610                  */
 611                 public void addIssue(String errorKey, boolean fatal, String... parameters) {
 612                         addIssue(new Issue(errorKey, fatal, parameters));
 613                 }
 614
 615                 /**
 616                  * {@inheritDoc}
 617                  */
 618                 public Iterator<Issue> iterator() {
 619                         return issues.iterator();
 620                 }
 621
 622                 /**
 623                  * Returns whether this check report does not contain any errors.
 624                  *
 625                  * @return {@code true} if this check report does not contain any
 626                  *         errors, {@code false} if this check report does contain
 627                  *         errors
 628                  */
 629                 public boolean isEmpty() {
 630                         return issues.isEmpty();
 631                 }
 632
 633                 /**
 634                  * Returns the number of issues in this check report.
 635                  *
 636                  * @return The number of issues
 637                  */
 638                 public int size() {
 639                         return issues.size();
 640                 }
 641
 642         }
 643
 644         /**
 645          * Container class for a single issue. An issue contains an error key
 646          * that describes the error, and a fatality flag that determines whether
 647          * the insert has to be aborted (if the flag is {@code true}) or if it
 648          * can still be performed and only a warning should be generated (if the
 649          * flag is {@code false}).
 650          *
 651          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’
 652          *         Roden</a>
 653          */
 654         public static class Issue {
 655
 656                 /** The error key. */
 657                 private final String errorKey;
 658
 659                 /** The fatality flag. */
 660                 private final boolean fatal;
 661
 662                 /** Additional parameters. */
 663                 private String[] parameters;
 664
 665                 /**
 666                  * Creates a new issue.
 667                  *
 668                  * @param errorKey
 669                  *            The error key
 670                  * @param fatal
 671                  *            The fatality flag
 672                  * @param parameters
 673                  *            Any additional parameters
 674                  */
 675                 protected Issue(String errorKey, boolean fatal, String... parameters) {
 676                         this.errorKey = errorKey;
 677                         this.fatal = fatal;
 678                         this.parameters = parameters;
 679                 }
 680
 681                 /**
 682                  * Returns the key of the encountered error.
 683                  *
 684                  * @return The error key
 685                  */
 686                 public String getErrorKey() {
 687                         return errorKey;
 688                 }
 689
 690                 /**
 691                  * Returns whether the issue is fatal and the insert has to be
 692                  * aborted. Otherwise only a warning should be shown.
 693                  *
 694                  * @return {@code true} if the insert needs to be aborted, {@code
 695                  *         false} otherwise
 696                  */
 697                 public boolean isFatal() {
 698                         return fatal;
 699                 }
 700
 701                 /**
 702                  * Returns any additional parameters.
 703                  *
 704                  * @return The additional parameters
 705                  */
 706                 public String[] getParameters() {
 707                         return parameters;
 708                 }
 709
 710         }
 711
 712 }