bundles/org.simantics.graphfile/src/org/simantics/graphfile/util/GraphFileUtil.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2013 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.graphfile.util;\r
  13 \r
  14 import java.io.File;\r
  15 import java.io.FileInputStream;\r
  16 import java.io.FileOutputStream;\r
  17 import java.io.IOException;\r
  18 import java.nio.ByteBuffer;\r
  19 import java.nio.channels.FileChannel;\r
  20 import java.util.Collection;\r
  21 import java.util.HashMap;\r
  22 import java.util.Map;\r
  23 \r
  24 import org.simantics.Simantics;\r
  25 import org.simantics.databoard.Bindings;\r
  26 import org.simantics.databoard.util.binary.RandomAccessBinary;\r
  27 import org.simantics.db.ReadGraph;\r
  28 import org.simantics.db.Resource;\r
  29 import org.simantics.db.WriteGraph;\r
  30 import org.simantics.db.common.request.ReadRequest;\r
  31 import org.simantics.db.common.request.WriteRequest;\r
  32 import org.simantics.db.common.utils.LiteralFileUtil;\r
  33 import org.simantics.db.exception.DatabaseException;\r
  34 import org.simantics.db.exception.DoesNotContainValueException;\r
  35 import org.simantics.db.exception.ManyObjectsForFunctionalRelationException;\r
  36 import org.simantics.db.exception.NoSingleResultException;\r
  37 import org.simantics.db.exception.ServiceException;\r
  38 import org.simantics.db.request.Read;\r
  39 import org.simantics.db.service.ClusteringSupport;\r
  40 import org.simantics.graphfile.ontology.GraphFileResource;\r
  41 import org.simantics.layer0.Layer0;\r
  42 \r
  43 /**\r
  44  * @author Marko Luukkainen\r
  45  */\r
  46 public class GraphFileUtil {\r
  47         \r
  48         \r
  49         public static boolean USE_RANDOM_ACCESS_BINARY = true;\r
  50         /**\r
  51          * Creates a temp file of a graphFile.\r
  52          * @param res\r
  53          * @return\r
  54          * @throws DatabaseException\r
  55          */\r
  56         public static File toTempFile(final Resource res)throws DatabaseException {\r
  57                 return Simantics.getSession().syncRequest(new Read<File>() {\r
  58                         @Override\r
  59                         public File perform(ReadGraph graph) throws DatabaseException {\r
  60                                 return toTempFile(graph, res);\r
  61                         }\r
  62                 });\r
  63         }\r
  64 \r
  65         /**\r
  66          * Creates a temp file of a graphFile.\r
  67          * @param graph\r
  68          * @param res\r
  69          * @return\r
  70          * @throws DatabaseException\r
  71          */\r
  72         public static File toTempFile(ReadGraph graph, Resource res)throws DatabaseException {\r
  73 \r
  74                 GraphFileResource gf = GraphFileResource.getInstance(graph);\r
  75                 String filename = graph.getRelatedValue(res, gf.HasResourceName);\r
  76                 \r
  77                 int index = filename.lastIndexOf(".");\r
  78                 String name = "";\r
  79                 String ext = "";\r
  80                 if (index > 0) {\r
  81                         name = filename.substring(0,index);\r
  82                         ext = filename.substring(index+1);\r
  83                 } else {\r
  84                         name = filename;\r
  85                 }\r
  86                 if (name.length() < 3) {\r
  87                         for (int i = name.length(); i < 3; i++)\r
  88                                 name += "_";\r
  89                 }\r
  90                 try {\r
  91                         File file = File.createTempFile(name, "."+ ext);\r
  92                         writeDataToFile(graph, res, file);\r
  93                         return file;\r
  94                 } catch (Exception e) {\r
  95                         throw new DatabaseException(e);\r
  96                 }\r
  97         }\r
  98         \r
  99         public static void writeDataToFile(final Resource res, final File file) throws DatabaseException{\r
 100                 Simantics.getSession().syncRequest(new ReadRequest() {\r
 101                         \r
 102                         @Override\r
 103                         public void run(ReadGraph graph) throws DatabaseException {\r
 104                                 try {\r
 105                                         writeDataToFile(graph, res, file);\r
 106                                 } catch (IOException e) {\r
 107                                         throw new DatabaseException(e);\r
 108                                 }\r
 109                         }\r
 110                 });\r
 111         }\r
 112         \r
 113         /**\r
 114          * Writes contents of a graphFile to file.\r
 115          * @param graph\r
 116          * @param res\r
 117          * @param file\r
 118          * @throws DatabaseException\r
 119          * @throws IOException\r
 120          */\r
 121         public static void writeDataToFile(ReadGraph graph, Resource res, File file) throws DatabaseException, IOException {\r
 122                 \r
 123                 GraphFileResource gf = GraphFileResource.getInstance(graph);\r
 124                 if (USE_RANDOM_ACCESS_BINARY) {\r
 125                         Resource filedata = graph.getSingleObject(res, gf.HasFiledata);\r
 126                         LiteralFileUtil.copyRandomAccessBinaryToFile(graph, filedata, file);\r
 127                 } else {\r
 128                 \r
 129                         byte[] data = graph.getRelatedValue(res, gf.HasFiledata);\r
 130                         FileOutputStream fos = new FileOutputStream(file);\r
 131                         fos.write(data);\r
 132                         fos.flush();\r
 133                         fos.close();\r
 134                 \r
 135                 }\r
 136                 Long lastModified = graph.getPossibleRelatedValue(res, gf.LastModified);\r
 137                 if (lastModified != null)\r
 138                         file.setLastModified(lastModified);\r
 139         }\r
 140 \r
 141         /**\r
 142          * Updates contents of a graphFile, including the name.\r
 143          * @param filename\r
 144          * @param graphFile\r
 145          * @throws DatabaseException\r
 146          */\r
 147         public static void toGraph(final String filename, final Resource graphFile)throws DatabaseException {\r
 148                 Simantics.getSession().syncRequest(new WriteRequest() {\r
 149                         @Override\r
 150                         public void perform(WriteGraph graph) throws DatabaseException {\r
 151                                 try {\r
 152                                         toGraph(graph, filename,graphFile);\r
 153                                 } catch (IOException e) {\r
 154                                         throw new DatabaseException(e);\r
 155                                 }\r
 156                         }\r
 157                 });\r
 158         }\r
 159         \r
 160         /**\r
 161          * Updates contents of a graphFile, including the name.\r
 162          * @param graph\r
 163          * @param filename\r
 164          * @param graphFile\r
 165          * @throws DatabaseException\r
 166          * @throws IOException\r
 167          */\r
 168         public static void toGraph(WriteGraph graph, String filename, Resource graphFile) throws DatabaseException, IOException {\r
 169                 File file = new File(filename);\r
 170                 if (!file.exists())\r
 171                         throw new IOException("File " + filename + " not found.");\r
 172                 \r
 173                 toGraph(graph, file, graphFile);\r
 174         }\r
 175         \r
 176         /**\r
 177          * Updates contents of a graphFile, including the name.\r
 178          * @param graph\r
 179          * @param file\r
 180          * @param graphFile\r
 181          * @throws DatabaseException\r
 182          * @throws IOException\r
 183          */\r
 184         public static void toGraph(WriteGraph graph, File file, Resource graphFile) throws DatabaseException, IOException {\r
 185 \r
 186                 writeDataToGraph(graph, file, graphFile);\r
 187                 String name = file.getName();\r
 188                 GraphFileResource gf = GraphFileResource.getInstance(graph);\r
 189                 graph.claimLiteral(graphFile, gf.HasResourceName, name);\r
 190                 \r
 191         }\r
 192         \r
 193         /**\r
 194          * Writes contents of a file to a graphFile (data and time stamp).\r
 195          * @param graph\r
 196          * @param file\r
 197          * @param graphFile\r
 198          * @throws IOException\r
 199          * @throws ManyObjectsForFunctionalRelationException\r
 200          * @throws ServiceException\r
 201          */\r
 202         public static void writeDataToGraph(WriteGraph graph, File file, Resource graphFile) throws IOException, DatabaseException{\r
 203                 GraphFileResource gf = GraphFileResource.getInstance(graph);\r
 204                 if (USE_RANDOM_ACCESS_BINARY) {\r
 205                         \r
 206                         Resource fileData = graph.getPossibleObject(graphFile, gf.HasFiledata);\r
 207                         RandomAccessBinary rab = null;\r
 208                         if (fileData == null) {\r
 209                                 Layer0 l0 = Layer0.getInstance(graph);\r
 210                                 ClusteringSupport cs = graph.getService(ClusteringSupport.class);\r
 211                                 fileData = graph.newResource(cs.createCluster());\r
 212                                 graph.claim(fileData, l0.InstanceOf, l0.ByteArray);\r
 213                                 graph.claim(graphFile, gf.HasFiledata, fileData);\r
 214                                 rab = graph.createRandomAccessBinary(fileData, Bindings.BYTE_ARRAY.type(), null);\r
 215                         } else {\r
 216                                 rab = graph.getRandomAccessBinary(fileData);\r
 217                         }\r
 218                         LiteralFileUtil.copyRandomAccessBinaryFromFile(file, rab);\r
 219                 } else {\r
 220                         FileInputStream stream = new FileInputStream(file);\r
 221                         FileChannel chan = stream.getChannel();\r
 222                         long lsize = chan.size();\r
 223                         if (lsize > Integer.MAX_VALUE)\r
 224                                 throw new IOException("File is too big");\r
 225                         int size = (int)lsize;\r
 226                         final byte[] array = new byte[size];\r
 227                         ByteBuffer buf = ByteBuffer.wrap(array);\r
 228                         while (size > 0)\r
 229                                 size -= chan.read(buf);\r
 230                         \r
 231                         graph.claimLiteral(graphFile, gf.HasFiledata, array);\r
 232                         chan.close();\r
 233                         stream.close();\r
 234                 }\r
 235 \r
 236                 graph.claimLiteral(graphFile, gf.LastModified, file.lastModified());\r
 237                 \r
 238         }\r
 239         \r
 240         public static void writeDataToGraph(WriteGraph graph, byte data[], Resource graphFile) throws IOException, ManyObjectsForFunctionalRelationException, ServiceException {\r
 241                 \r
 242                 GraphFileResource gf = GraphFileResource.getInstance(graph);\r
 243                 graph.claimLiteral(graphFile, gf.HasFiledata, data);\r
 244                 graph.claimLiteral(graphFile, gf.LastModified, 0L);\r
 245         }\r
 246         \r
 247         /**\r
 248          * Writes contents of a file to a graphFile (data and time stamp).\r
 249          * @param file\r
 250          * @param graphFile\r
 251          * @throws DatabaseException\r
 252          */\r
 253         public static void writeDataToGraph(final File file, final Resource graphFile) throws DatabaseException {\r
 254                 Simantics.getSession().syncRequest(new WriteRequest() {\r
 255                         \r
 256                         @Override\r
 257                         public void perform(WriteGraph graph) throws DatabaseException {\r
 258                                 try {\r
 259                                         writeDataToGraph(graph, file, graphFile);\r
 260                                 } catch (IOException e) {\r
 261                                         throw new DatabaseException(e);\r
 262                                 }\r
 263                                 \r
 264                         }\r
 265                 });\r
 266         }\r
 267         \r
 268         public static void syncFolderToGraph(WriteGraph g, File folder, Resource folderRes) throws Exception {\r
 269                 File subFiles[] = folder.listFiles();\r
 270                 Layer0 l0 = Layer0.getInstance(g);\r
 271                 GraphFileResource gf = GraphFileResource.getInstance(g);\r
 272                 Collection<Resource> subFileResources = g.getObjects(folderRes, gf.HasFile);\r
 273                 Collection<Resource> subFolderResources = g.getObjects(folderRes, gf.HasFolder);\r
 274                                 \r
 275                 Map<Resource,File> matching = new HashMap<Resource, File>();\r
 276                 \r
 277                 for (File f : subFiles) {\r
 278                         String name = f.getName();\r
 279                         if (f.isDirectory()) {\r
 280                                 Resource matchingFolder = findWithName(g, subFolderResources, name);\r
 281 \r
 282                                 if (matchingFolder != null) {\r
 283                                         if (matching.containsKey(matchingFolder))\r
 284                                                 throw new Exception("Matching folder already in use" + f.getAbsolutePath() + " " + matchingFolder);\r
 285                                         \r
 286                                         matching.put(matchingFolder, f);\r
 287                                         syncFolderToGraph(g, f, matchingFolder);\r
 288                                 } else {\r
 289                                         matchingFolder = g.newResource();\r
 290                                         g.claim(matchingFolder, l0.InstanceOf, gf.Folder);\r
 291                                         g.claimLiteral(matchingFolder, gf.HasResourceName, name);\r
 292                                         g.claimLiteral(matchingFolder, l0.HasName, name);\r
 293                                         g.claim(folderRes, gf.HasFolder, matchingFolder);\r
 294                                         matching.put(matchingFolder, f);\r
 295                                         syncFolderToGraph(g, f, matchingFolder);\r
 296                                 }\r
 297                         } else { //file\r
 298                                 Resource fileRes = findWithName(g, subFileResources, name);\r
 299                                 if (fileRes != null) {\r
 300                                         if (matching.containsKey(fileRes))\r
 301                                                 throw new Exception("Matching file already in use" + f.getAbsolutePath() + " " + fileRes);\r
 302                                         matching.put(fileRes, f);\r
 303                                         toGraph(g, f, fileRes);\r
 304                                 } else {\r
 305                                         fileRes = g.newResource();\r
 306                                         g.claim(fileRes, l0.InstanceOf, gf.File);\r
 307                                         g.claimLiteral(fileRes, gf.HasResourceName, name);\r
 308                                         g.claimLiteral(fileRes, l0.HasName, name);\r
 309                                         g.claim(folderRes, gf.HasFile, fileRes);\r
 310                                         matching.put(fileRes, f);\r
 311                                         toGraph(g, f, fileRes);\r
 312                                 }\r
 313                         }\r
 314                 }\r
 315                 // delete resources, which have no matching file (or folder)\r
 316                 for (Resource subFolder : subFolderResources) {\r
 317                         if (!matching.containsKey(subFolder))\r
 318                                 g.deny(subFolder);\r
 319                 }\r
 320                 \r
 321                 for (Resource subFolder : subFileResources) {\r
 322                         if (!matching.containsKey(subFolder))\r
 323                                 g.deny(subFolder);\r
 324                 }\r
 325         }\r
 326         \r
 327         public static void writeFolderToDisk(ReadGraph g, Resource folderRes, File folder) throws DatabaseException, IOException{\r
 328 \r
 329                 GraphFileResource gf = GraphFileResource.getInstance(g);\r
 330                 for (Resource subFolder : g.getObjects(folderRes, gf.HasFolder)) {\r
 331                         String name = g.getRelatedValue(subFolder, gf.HasResourceName);\r
 332 \r
 333                         if (name.length() == 0)\r
 334                                 throw new DatabaseException("Empty folder name for " + subFolder);\r
 335                         \r
 336                         File newFolder = new File(folder.getAbsolutePath() + "/" + name);\r
 337                         if (!newFolder.mkdir()) {\r
 338                                 throw new DatabaseException("Could not create folder " + name + " for resource " + subFolder);\r
 339                         }\r
 340                         writeFolderToDisk(g, subFolder, newFolder);\r
 341                 }\r
 342                 for (Resource fileRes : g.getObjects(folderRes, gf.HasFile)) {\r
 343                         String name = g.getRelatedValue(fileRes, gf.HasResourceName);\r
 344                         File file = new File(folder.getAbsolutePath() + "/" + name);\r
 345                         writeDataToFile(g, fileRes, file);\r
 346                 }\r
 347         }\r
 348         \r
 349         public static void syncFolderToGraph(WriteGraph g, File folder, Resource folderRes, ToGraphHelper helper) throws Exception {\r
 350                 File subFiles[] = folder.listFiles();\r
 351                 GraphFileResource gf = GraphFileResource.getInstance(g);\r
 352                 Collection<Resource> subFileResources = g.getObjects(folderRes, gf.HasFile);\r
 353                 Collection<Resource> subFolderResources = g.getObjects(folderRes, gf.HasFolder);\r
 354                                 \r
 355                 Map<Resource,File> matching = new HashMap<Resource, File>();\r
 356                 \r
 357                 for (File f : subFiles) {\r
 358                         String name = f.getName();\r
 359                         if (f.isDirectory()) {\r
 360                                 Resource matchingFolder = helper.findFolder(g, subFolderResources, name);\r
 361 \r
 362                                 if (matchingFolder != null) {\r
 363                                         if (matching.containsKey(matchingFolder))\r
 364                                                 throw new Exception("Matching folder already in use" + f.getAbsolutePath() + " " + matchingFolder);\r
 365                                         \r
 366                                         matching.put(matchingFolder, f);\r
 367                                         syncFolderToGraph(g, f, matchingFolder,helper);\r
 368                                 } else {\r
 369                                         matchingFolder = helper.createFolder(g, name);\r
 370                                         g.claim(folderRes, gf.HasFolder, matchingFolder);\r
 371                                         matching.put(matchingFolder, f);\r
 372                                         syncFolderToGraph(g, f, matchingFolder,helper);\r
 373                                 }\r
 374                         } else { //file\r
 375                                 Resource fileRes = helper.findFile(g, subFileResources, name);\r
 376                                 if (fileRes != null) {\r
 377                                         if (matching.containsKey(fileRes))\r
 378                                                 throw new Exception("Matching file already in use" + f.getAbsolutePath() + " " + fileRes);\r
 379                                         matching.put(fileRes, f);\r
 380                                         toGraph(g, f, fileRes);\r
 381                                 } else {\r
 382                                         fileRes = helper.createFile(g, name);\r
 383                                         g.claim(folderRes, gf.HasFile, fileRes);\r
 384                                         matching.put(fileRes, f);\r
 385                                         toGraph(g, f, fileRes);\r
 386                                 }\r
 387                         }\r
 388                 }\r
 389                 // delete resources, which have no matching file (or folder)\r
 390                 for (Resource subFolder : subFolderResources) {\r
 391                         if (!matching.containsKey(subFolder))\r
 392                                 g.deny(subFolder);\r
 393                 }\r
 394                 \r
 395                 for (Resource subFolder : subFileResources) {\r
 396                         if (!matching.containsKey(subFolder))\r
 397                                 g.deny(subFolder);\r
 398                 }\r
 399         }\r
 400         \r
 401         public static interface ToGraphHelper {\r
 402                 public Resource findFolder(ReadGraph g, Collection<Resource> subFolderResources, String name) throws DatabaseException;\r
 403                 public Resource createFolder(WriteGraph g, String name) throws DatabaseException;\r
 404                 public Resource findFile(ReadGraph g, Collection<Resource> subFileResources, String name) throws DatabaseException;\r
 405                 public Resource createFile(WriteGraph g, String name) throws DatabaseException;\r
 406         }\r
 407         \r
 408         public static interface ToDiskHelper {\r
 409                 public String getName(ReadGraph g, Resource systemResource) throws DatabaseException;\r
 410         }\r
 411         \r
 412         public static void writeFolderToDisk(ReadGraph g, Resource folderRes, File folder, ToDiskHelper helper) throws DatabaseException, IOException{\r
 413                 GraphFileResource gf = GraphFileResource.getInstance(g);\r
 414                 for (Resource subFolder : g.getObjects(folderRes, gf.HasFolder)) {\r
 415                         String name = helper.getName(g, subFolder);\r
 416 \r
 417                         if (name.length() == 0)\r
 418                                 throw new DatabaseException("Empty folder name for " + subFolder);\r
 419                         \r
 420                         File newFolder = new File(folder.getAbsolutePath() + "/" + name);\r
 421                         if (!newFolder.mkdir()) {\r
 422                                 throw new DatabaseException("Could not create folder " + name + " for resource " + subFolder);\r
 423                         }\r
 424                         writeFolderToDisk(g, subFolder, newFolder, helper);\r
 425                 }\r
 426                 for (Resource fileRes : g.getObjects(folderRes, gf.HasFile)) {\r
 427                         String name = helper.getName(g, fileRes);\r
 428                         File file = new File(folder.getAbsolutePath() + "/" + name);\r
 429                         writeDataToFile(g, fileRes, file);\r
 430                 }\r
 431         }\r
 432         \r
 433         public static interface ToDiskHelper2 extends ToDiskHelper {\r
 434                 public Resource findFolder(ReadGraph g, Collection<Resource> subFolderResources, String name) throws DatabaseException;\r
 435                 public Resource findFile(ReadGraph g, Collection<Resource> subFileResources, String name) throws DatabaseException;\r
 436         }\r
 437         \r
 438         public static void syncFolderToDisk(ReadGraph g, Resource folderRes, File folder, ToDiskHelper2 helper) throws Exception {\r
 439                 File subFiles[] = folder.listFiles();\r
 440                 GraphFileResource gf = GraphFileResource.getInstance(g);\r
 441                 Collection<Resource> subFileResources = g.getObjects(folderRes, gf.HasFile);\r
 442                 Collection<Resource> subFolderResources = g.getObjects(folderRes, gf.HasFolder);\r
 443                                 \r
 444                 Map<Resource,File> matching = new HashMap<Resource, File>();\r
 445                 \r
 446                 for (File f : subFiles) {\r
 447                         String name = f.getName();\r
 448                         if (f.isDirectory()) {\r
 449                                 Resource matchingFolder = helper.findFolder(g, subFolderResources, name);\r
 450 \r
 451                                 if (matchingFolder != null) {\r
 452                                         if (matching.containsKey(matchingFolder))\r
 453                                                 throw new Exception("Matching folder already in use" + f.getAbsolutePath() + " " + matchingFolder);\r
 454                                         \r
 455                                         matching.put(matchingFolder, f);\r
 456                                         syncFolderToDisk(g, matchingFolder, f, helper);\r
 457                                 } else {\r
 458                                         deleteDirectoryStructure(f);\r
 459                                 }\r
 460                         } else { //file\r
 461                                 Resource fileRes = helper.findFile(g, subFileResources, name);\r
 462                                 if (fileRes != null) {\r
 463                                         if (matching.containsKey(fileRes))\r
 464                                                 throw new Exception("Matching file already in use" + f.getAbsolutePath() + " " + fileRes);\r
 465                                         matching.put(fileRes, f);\r
 466                                         writeDataToFile(g, fileRes, f);\r
 467                                 } else {\r
 468                                         if (!f.delete())\r
 469                                         throw new Exception("Cannot delete file " + f.getAbsolutePath());\r
 470                                 }\r
 471                         }\r
 472                 }\r
 473                 // create files and folders, which have no matching graphFile (or folder)\r
 474                 for (Resource subFolder : subFolderResources) {\r
 475                         if (!matching.containsKey(subFolder)) {\r
 476                                 String name = helper.getName(g, subFolder);\r
 477 \r
 478                                 if (name.length() == 0)\r
 479                                         throw new DatabaseException("Empty folder name for " + subFolder);\r
 480                                 \r
 481                                 File newFolder = new File(folder.getAbsolutePath() + "/" + name);\r
 482                                 if (!newFolder.mkdir()) {\r
 483                                         throw new DatabaseException("Could not create folder " + name + " for resource " + subFolder);\r
 484                                 }\r
 485                                 writeFolderToDisk(g, subFolder, newFolder, helper);\r
 486                         }\r
 487                 }\r
 488                 \r
 489                 for (Resource fileRes : subFileResources) {\r
 490                         if (!matching.containsKey(fileRes)) {\r
 491                                 String name = helper.getName(g, fileRes);\r
 492                                 File file = new File(folder.getAbsolutePath() + "/" + name);\r
 493                                 writeDataToFile(g, fileRes, file);\r
 494                         }\r
 495                 }\r
 496                 \r
 497         }\r
 498         \r
 499         \r
 500         \r
 501         public static Resource findWithName(ReadGraph g, Collection<Resource> resources, String name) throws ServiceException, NoSingleResultException, DoesNotContainValueException {\r
 502                 GraphFileResource gf = GraphFileResource.getInstance(g);\r
 503                 for (Resource r : resources)\r
 504                         if (name.equals(g.getRelatedValue(r, gf.HasResourceName)))\r
 505                                 return r;\r
 506                 return null;\r
 507         }\r
 508         \r
 509         /**\r
 510          * Deletes the directory and all it contents.\r
 511          * @param dir\r
 512          * @throws Exception\r
 513          */\r
 514         public static void deleteDirectoryStructure(File dir) throws Exception{\r
 515                 deleteDirectoryStructure(dir, true);\r
 516         }\r
 517         \r
 518         /**\r
 519          * Deletes the directory's contents, but does not delete the directory.\r
 520          * @param dir\r
 521          * @throws Exception\r
 522          */\r
 523         public static void clearDirectoryStructure(File dir) throws Exception{\r
 524                 deleteDirectoryStructure(dir, false);\r
 525         }\r
 526         \r
 527         private static void deleteDirectoryStructure(File dir, boolean deleteDir) throws Exception{\r
 528                 File subFiles[] = dir.listFiles();\r
 529                 for (File f : subFiles) {\r
 530                         if (f.isDirectory())\r
 531                                 deleteDirectoryStructure(f,true);\r
 532                         else\r
 533                                 if (!f.delete()) {\r
 534                                         throw new Exception("Cannot delete file " + f.getAbsolutePath());\r
 535                                 }\r
 536                 }\r
 537                 if (deleteDir) {\r
 538                         if (!dir.delete()) {\r
 539                                 throw new Exception("Cannot delete folder " + dir.getAbsolutePath());\r
 540                         }\r
 541                 }\r
 542         }\r
 543 }\r