bundles/org.simantics.graph.db/src/org/simantics/graph/db/StreamingTransferableGraphImportProcess.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2012, 2016 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  *     Semantum Oy\r
  12  *******************************************************************************/\r
  13 package org.simantics.graph.db;\r
  14 \r
  15 import java.io.DataInput;\r
  16 import java.io.DataOutput;\r
  17 import java.io.DataOutputStream;\r
  18 import java.io.FileNotFoundException;\r
  19 import java.io.FileOutputStream;\r
  20 import java.io.IOException;\r
  21 import java.io.InputStream;\r
  22 import java.util.HashSet;\r
  23 import java.util.Map;\r
  24 import java.util.Set;\r
  25 import java.util.TreeMap;\r
  26 \r
  27 import org.simantics.databoard.Bindings;\r
  28 import org.simantics.databoard.adapter.AdaptException;\r
  29 import org.simantics.databoard.binding.Binding;\r
  30 import org.simantics.databoard.binding.mutable.Variant;\r
  31 import org.simantics.databoard.serialization.Serializer;\r
  32 import org.simantics.databoard.type.Datatype;\r
  33 import org.simantics.db.ReadGraph;\r
  34 import org.simantics.db.Resource;\r
  35 import org.simantics.db.Session;\r
  36 import org.simantics.db.VirtualGraph;\r
  37 import org.simantics.db.WriteOnlyGraph;\r
  38 import org.simantics.db.common.WriteBindings;\r
  39 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;\r
  40 import org.simantics.db.common.uri.UnescapedChildMapOfResource;\r
  41 import org.simantics.db.common.utils.Logger;\r
  42 import org.simantics.db.exception.DatabaseException;\r
  43 import org.simantics.db.service.ClusterBuilder2;\r
  44 import org.simantics.db.service.ClusterBuilderFactory;\r
  45 import org.simantics.db.service.ClusteringSupport;\r
  46 import org.simantics.db.service.SerialisationSupport;\r
  47 import org.simantics.graph.db.TransferableGraphSource.TransferableGraphSourceProcedure;\r
  48 import org.simantics.graph.db.TransferableGraphSource.TransferableGraphSourceValueProcedure;\r
  49 import org.simantics.graph.representation.Extensions;\r
  50 import org.simantics.graph.representation.External;\r
  51 import org.simantics.graph.representation.Identity;\r
  52 import org.simantics.graph.representation.IdentityDefinition;\r
  53 import org.simantics.graph.representation.Internal;\r
  54 import org.simantics.graph.representation.Optional;\r
  55 import org.simantics.graph.representation.Root;\r
  56 import org.simantics.graph.representation.TransferableGraphUtils;\r
  57 import org.simantics.graph.utils.TGResourceUtil;\r
  58 import org.simantics.graph.utils.TGResourceUtil.LongAdapter;\r
  59 \r
  60 public class StreamingTransferableGraphImportProcess implements TransferableGraphImporter {\r
  61         \r
  62         public static String LOG_FILE = "transferableGraphs.log";\r
  63         final static private boolean LOG = false;\r
  64         \r
  65         static DataOutput log;\r
  66 \r
  67         static {\r
  68 \r
  69                 if (LOG) {\r
  70                         \r
  71                         try {\r
  72                                 FileOutputStream stream = new FileOutputStream(LOG_FILE);\r
  73                                 log = new DataOutputStream(stream);\r
  74                         } catch (FileNotFoundException e) {\r
  75                                 e.printStackTrace();\r
  76                         }\r
  77                 }\r
  78 \r
  79         }\r
  80         \r
  81         private static void log(String line) {\r
  82                 if (LOG) {\r
  83                         try {\r
  84                                 log.writeUTF(line + "\n");\r
  85                         } catch (IOException e) {\r
  86                                 e.printStackTrace();\r
  87                         }\r
  88                 }\r
  89         }\r
  90 \r
  91         Resource indexRoot;\r
  92         TransferableGraphSource tg;\r
  93         VirtualGraph vg;\r
  94         IImportAdvisor2 advisor;\r
  95         ClusterBuilder2 builder;\r
  96         final TGResourceUtil resourceUtil = new TGResourceUtil();\r
  97         \r
  98         int[] handles;\r
  99         \r
 100         Set<String> missingExternals = new HashSet<String>(); \r
 101         \r
 102         int resourceCount;\r
 103         Identity[] identities;\r
 104         TreeMap<String, Variant> extensions;\r
 105         \r
 106         // Builtins\r
 107         Resource RootLibrary;\r
 108         Resource String;\r
 109         Resource Library;\r
 110         \r
 111         Resource InstanceOf;\r
 112         Resource ConsistsOf;\r
 113         Resource PartOf;\r
 114         Resource HasName;\r
 115         Resource NameOf;        \r
 116                                 \r
 117         public StreamingTransferableGraphImportProcess(Session session, VirtualGraph vg, TransferableGraphSource tg, IImportAdvisor2 advisor) {\r
 118                 this.tg = tg;\r
 119                 this.vg = vg;\r
 120                 this.advisor = advisor;\r
 121         }\r
 122         \r
 123         public void readIdentities(ReadGraph g) throws Exception {\r
 124                 extensions = tg.getExtensions();\r
 125                 resourceCount = tg.getResourceCount();\r
 126                 identities = new Identity[tg.getIdentityCount()];\r
 127                 tg.forIdentities(g, new TransferableGraphSourceProcedure<Identity>() {\r
 128                         \r
 129                         int counter = 0;\r
 130                         \r
 131                         @Override\r
 132                         public void execute(Identity value) throws Exception {\r
 133                                 identities[counter++] = value;\r
 134                         }\r
 135                 });\r
 136         }\r
 137         \r
 138         public void findBuiltins(WriteOnlyGraph g) throws DatabaseException {\r
 139                 RootLibrary = g.getBuiltin("http:/");\r
 140                 String = g.getBuiltin(CoreInitialization.LAYER0 + "String");\r
 141                 Library = g.getBuiltin(CoreInitialization.LAYER0 + "Library");\r
 142                 InstanceOf = g.getBuiltin(CoreInitialization.LAYER0 + "InstanceOf");\r
 143                 ConsistsOf = g.getBuiltin(CoreInitialization.LAYER0 + "ConsistsOf");\r
 144                 PartOf = g.getBuiltin(CoreInitialization.LAYER0 + "PartOf");\r
 145                 HasName = g.getBuiltin(CoreInitialization.LAYER0 + "HasName");\r
 146                 NameOf = g.getBuiltin(CoreInitialization.LAYER0 + "NameOf");\r
 147         }\r
 148         \r
 149         public void findBuiltins(ReadGraph g) throws DatabaseException {\r
 150                 RootLibrary = g.getBuiltin("http:/");\r
 151                 String = g.getBuiltin(CoreInitialization.LAYER0 + "String");\r
 152                 Library = g.getBuiltin(CoreInitialization.LAYER0 + "Library");\r
 153                 InstanceOf = g.getBuiltin(CoreInitialization.LAYER0 + "InstanceOf");\r
 154                 ConsistsOf = g.getBuiltin(CoreInitialization.LAYER0 + "ConsistsOf");\r
 155                 PartOf = g.getBuiltin(CoreInitialization.LAYER0 + "PartOf");\r
 156                 HasName = g.getBuiltin(CoreInitialization.LAYER0 + "HasName");\r
 157                 NameOf = g.getBuiltin(CoreInitialization.LAYER0 + "NameOf");\r
 158         }\r
 159 \r
 160 //      /* Preparation that is used when the core is empty. \r
 161 //       */\r
 162 //      void initialPrepare(WriteOnlyGraph graph) throws DatabaseException {\r
 163 //              findBuiltins(graph);\r
 164 //              \r
 165 //              resources = new Resource[tg.resourceCount];\r
 166 //              \r
 167 //              int Root = -1;\r
 168 //              int SimanticsDomain = -1;\r
 169 //              int Layer0 = -1;\r
 170 //              \r
 171 //              for(Identity identity : tg.identities) {\r
 172 //                      if(identity.definition instanceof Internal) {\r
 173 //                              Internal def = (Internal)identity.definition;\r
 174 //                              Resource res = null;\r
 175 //                              if(def.parent == Layer0) {\r
 176 //                                      try {\r
 177 //                                              res = graph.getBuiltin(CoreInitialization.LAYER0 + def.name);\r
 178 //                                      } catch(ResourceNotFoundException e) {                                                                          \r
 179 //                                      }\r
 180 //                              }\r
 181 //                              else if(def.parent == SimanticsDomain) {\r
 182 //                                      if(def.name.equals("Layer0-1.0"))\r
 183 //                                              Layer0 = identity.resource;\r
 184 //                              }\r
 185 //                              else if(def.parent == Root) {\r
 186 //                                      if(def.name.equals("www.simantics.org"))\r
 187 //                                              SimanticsDomain = identity.resource;\r
 188 //                              }\r
 189 //\r
 190 //                              if(res == null)\r
 191 //                                      res = createChild(graph, resources[def.parent], def.name);\r
 192 //                              else\r
 193 //                                      createChild(graph, res, resources[def.parent], def.name);\r
 194 //                              resources[identity.resource] = res;\r
 195 //                      }\r
 196 //                      else if(identity.definition instanceof Root) {\r
 197 //                              Root = identity.resource;\r
 198 //                              resources[identity.resource] = RootLibrary;                             \r
 199 //                      } \r
 200 //              }\r
 201 //      }\r
 202         \r
 203         void addMissing(String external) {\r
 204                 Set<String> removals = new HashSet<String>();\r
 205                 for(String ext : missingExternals) if(ext.startsWith(external)) return;\r
 206                 for(String ext : missingExternals) if(external.startsWith(ext)) removals.add(ext);\r
 207                 missingExternals.removeAll(removals);\r
 208                 missingExternals.add(external);\r
 209         }\r
 210         \r
 211         void prepare(ReadGraph graph) throws Exception {\r
 212 \r
 213 //              indexRoot = graph.syncRequest(new PossibleIndexRoot(((IImportAdvisor2)advisor).getTarget()));\r
 214                 \r
 215                 findBuiltins(graph);\r
 216                 readIdentities(graph);\r
 217                 \r
 218 //              System.err.println("ext: " + extensions);\r
 219 //              System.err.println("rc: " + resourceCount);\r
 220 //              System.err.println("ic: " + identities.length);\r
 221                 \r
 222                 ClusterBuilderFactory factory = graph.getService(ClusterBuilderFactory.class);\r
 223                 ClusterBuilder2 builder = factory.create(vg, false);\r
 224                 \r
 225         this.handles = new int[resourceCount];\r
 226                 \r
 227                 for(Identity identity : identities) {\r
 228                         IdentityDefinition definition = identity.definition;\r
 229                         if(definition instanceof External) {\r
 230                                 External def = (External)definition;\r
 231                                 if(def.parent == -1) {\r
 232                                     handles[identity.resource] = builder.handle(RootLibrary);\r
 233                                 } else {\r
 234                                         if("@inverse".equals(def.name)) {\r
 235                                                 int parent = handles[def.parent];\r
 236                                                 int child = builder.handle(graph.getInverse(builder.resource(parent)));\r
 237                                                 handles[identity.resource] = child;\r
 238                                         } else {\r
 239                                                 int handle = handles[def.parent];\r
 240                                                 Resource parent = handle != 0 ? builder.resource(handle) : null;\r
 241                                                 // TODO: escape should be removed when names become well-behaving\r
 242                                                 if(parent != null) {\r
 243                                                     Map<String,Resource> childMap = graph\r
 244                                             .syncRequest(new UnescapedChildMapOfResource(parent),\r
 245                                                     new TransientCacheAsyncListener<Map<String, Resource>>()); \r
 246                                                         Resource child = childMap.get(def.name); \r
 247                                                         if(child == null) {\r
 248                                                                 addMissing(graph.getURI(parent) + "/" + def.name);\r
 249                                                         } else {\r
 250                                                                 handles[identity.resource] = builder.handle(child);\r
 251                                                         }\r
 252                                                 } else {\r
 253                                                     addMissing(TransferableGraphUtils.getURI(resourceCount, identities, def.parent) + "/" + def.name);\r
 254                                                 }\r
 255                                         }\r
 256                                 }\r
 257                         }\r
 258                         else if(definition instanceof Internal) {\r
 259                                 // Do not do anything for now\r
 260                         }\r
 261                         else if(definition instanceof Root) {\r
 262                                 Root root = (Root)definition;\r
 263                                 if(root.name.equals(""))\r
 264                                     handles[identity.resource] = builder.handle(RootLibrary);\r
 265                                 else  {\r
 266                                         Resource existing = advisor.analyzeRoot(graph, root);\r
 267                                         if(existing != null)\r
 268                                             handles[identity.resource] = builder.handle(existing);\r
 269                                 }\r
 270                         }\r
 271                         else if(definition instanceof Optional) {\r
 272                                 External def = (External)definition;\r
 273                                 Resource parent = builder.resource(handles[def.parent]);\r
 274                                 if(parent != null)\r
 275                                         handles[identity.resource] = builder.handle(graph.syncRequest(new UnescapedChildMapOfResource(parent)).get(def.name));                          \r
 276                         }\r
 277                 }               \r
 278                 \r
 279                 if(!missingExternals.isEmpty()) throw new MissingDependencyException(this);\r
 280                 \r
 281         }\r
 282 \r
 283         @Override\r
 284         public Resource createChild(WriteOnlyGraph graph, Resource parent, Resource child, String name) throws DatabaseException {\r
 285             if(child == null) child = graph.newResource();\r
 286                 Resource nameResource = graph.newResource();\r
 287                 graph.claim(nameResource, InstanceOf, null, String);\r
 288                 graph.claimValue(nameResource, name, WriteBindings.STRING);\r
 289                 graph.claim(child, HasName, NameOf, nameResource);\r
 290                 return child;\r
 291         }\r
 292         \r
 293         int[] getClustering() {\r
 294                 Variant v = extensions.get(Extensions.CLUSTERING);\r
 295                 if(v == null) return null;\r
 296                 try {\r
 297                         return (int[])v.getValue(Bindings.INT_ARRAY);\r
 298                 } catch (AdaptException e) {\r
 299                         Logger.defaultLogError(e);\r
 300                         return null;\r
 301                 }\r
 302         }\r
 303 \r
 304         int[] getClusterSets() {\r
 305                 Variant v = extensions.get(Extensions.CLUSTER_SETS);\r
 306                 if(v == null) return null;\r
 307                 try {\r
 308                         return (int[])v.getValue(Bindings.INT_ARRAY);\r
 309                 } catch (AdaptException e) {\r
 310                         Logger.defaultLogError(e);\r
 311                         return null;\r
 312                 }\r
 313         }\r
 314 \r
 315         boolean needTranslation(Datatype type) {\r
 316             return resourceUtil.mayHaveResource(type);\r
 317         }\r
 318         \r
 319         void findClusterSet(WriteOnlyGraph graph, Resource rootLibrary, Resource indexRoot, int[] clustering, int[] clusterSets, long[] clusters, int id) throws DatabaseException {\r
 320                 ClusteringSupport support = graph.getService(ClusteringSupport.class);\r
 321                 if(id == Extensions.ROOT_LIBRARY_CLUSTER_SET || id == Extensions.INDEX_ROOT_CLUSTER_SET) return;\r
 322                 for(int pos=0,index=0;index<clustering.length;index++) {\r
 323                         pos += clustering[index];\r
 324                         if(id < pos) {\r
 325                                 int cs = clusterSets[index]; \r
 326                                 if(handles[id] == 0) {\r
 327                                         int csHandle = 0;\r
 328                                         if(cs == Extensions.ROOT_LIBRARY_CLUSTER_SET) csHandle = builder.handle(rootLibrary);\r
 329                                         else if(cs == Extensions.INDEX_ROOT_CLUSTER_SET) csHandle = builder.handle(indexRoot);\r
 330                                         else {\r
 331                                                 findClusterSet(graph, rootLibrary, indexRoot, clustering, clusterSets, clusters, cs);\r
 332                                                 csHandle = handles[cs];\r
 333                                         }\r
 334                                         \r
 335                                         if(clusters[index] != 0)\r
 336                                                 builder.selectCluster(clusters[index]);\r
 337                                         else if(cs >= 0)\r
 338                                                 builder.newCluster(csHandle);\r
 339                                         \r
 340                                         handles[id] = builder.newResource(csHandle);\r
 341                                         clusters[index] = support.getCluster(builder.resource(handles[id]));\r
 342                                                         \r
 343                                         builder.createClusterSet(handles[id]);\r
 344                                 }\r
 345                                 return;\r
 346                         }\r
 347                 }\r
 348         }\r
 349         \r
 350         void write(final WriteOnlyGraph graph) throws Exception {\r
 351         \r
 352         final SerialisationSupport ss = graph.getService(SerialisationSupport.class);\r
 353             \r
 354         ClusterBuilderFactory factory = graph.getService(ClusterBuilderFactory.class);\r
 355         if(advisor instanceof IImportAdvisor2) {\r
 356             boolean allowImmutable = ((IImportAdvisor2)advisor).allowImmutableModifications();\r
 357             builder = factory.create(vg, allowImmutable);\r
 358         } else {\r
 359             builder = factory.create(vg, false);\r
 360         }\r
 361         \r
 362                 final int[] handles = this.handles; \r
 363                 \r
 364                 int[] clustering = getClustering();\r
 365                 if(clustering != null) {\r
 366                         \r
 367                         int[] clusterSets = getClusterSets();\r
 368                         if(clusterSets != null) {\r
 369 \r
 370                                 assert(clustering.length == clusterSets.length);\r
 371 \r
 372                                 long[] clusters = new long[clustering.length];\r
 373                                 \r
 374                                 // Create clustering\r
 375                                 for(int i=0;i<clusterSets.length;i++) {\r
 376                                         findClusterSet(graph, graph.getRootLibrary(), indexRoot, clustering, clusterSets, clusters, clusterSets[i]);\r
 377                                 }\r
 378                                 \r
 379                                 // Then create all resources\r
 380                                 int i=0;\r
 381                             for(int j=0;j<clustering.length;j++) {\r
 382                                 int c = clustering[j];\r
 383                                 int s = clusterSets[j];\r
 384                                 int setHandle = 0;\r
 385                                         if(s == Extensions.ROOT_LIBRARY_CLUSTER_SET)\r
 386                                                 setHandle = builder.handle(graph.getRootLibrary());\r
 387                                         else if(s == Extensions.INDEX_ROOT_CLUSTER_SET)\r
 388                                                 setHandle = builder.handle(indexRoot);\r
 389                                         else setHandle = handles[s];\r
 390                                         // Preserve clustering only for internal resources\r
 391                                         if(clusters[j] != 0)\r
 392                                                 builder.selectCluster(clusters[j]);\r
 393                                         else if(s >= 0)\r
 394                                                 builder.newCluster(setHandle);\r
 395                                         for(int r=0;r<c;r++, i++)\r
 396                                                 if(handles[i] == 0) handles[i] = builder.newResource();\r
 397                                 }\r
 398 \r
 399                                 for(;i<handles.length;++i)\r
 400                                         if(handles[i] == 0) handles[i] = builder.newResource();\r
 401                                 \r
 402                         } else {\r
 403 \r
 404                         int i = 0;\r
 405                                 for(int c : clustering) {\r
 406                                         builder.newCluster();\r
 407                                         for(int r=0;r<c;r++, i++)\r
 408                                                 if(handles[i] == 0) handles[i] = builder.newResource();\r
 409                                 }\r
 410 \r
 411                                 for(;i<handles.length;++i)\r
 412                                         if(handles[i] == 0) handles[i] = builder.newResource();\r
 413                                 \r
 414                         }\r
 415                         \r
 416                 } else {\r
 417                 \r
 418                         // Create blank resources\r
 419                         for(int i=0;i<handles.length;++i)\r
 420                                 if(handles[i] == 0) handles[i] = builder.newResource();\r
 421 \r
 422                 }\r
 423                 \r
 424                 // Internal identities          \r
 425                 for(Identity identity : identities) {\r
 426                         IdentityDefinition definition = identity.definition;\r
 427 //                      if(handles[identity.resource] != 0)\r
 428 //                              continue;\r
 429                         if(definition instanceof External) {\r
 430                                 // Already done everything\r
 431                         }\r
 432                         else if(definition instanceof Internal) {\r
 433                                 Internal def = (Internal)definition;\r
 434                                 if(handles[identity.resource] != 0)\r
 435                                         handles[identity.resource] = builder.handle(advisor.createChild(graph, this, builder.resource(handles[def.parent]), builder.resource(handles[identity.resource]), def.name));\r
 436                                 else\r
 437                                         handles[identity.resource] = builder.handle(advisor.createChild(graph, this, builder.resource(handles[def.parent]), null, def.name));\r
 438                         }\r
 439                         else if(definition instanceof Root) {\r
 440                                 \r
 441                                 Root root = (Root)definition;\r
 442                                 if(handles[identity.resource] != 0)\r
 443                                         handles[identity.resource] = builder.handle(advisor.createRoot(graph, root, builder.resource(handles[identity.resource])));\r
 444                                 else\r
 445                                         handles[identity.resource] = builder.handle(advisor.createRoot(graph, root, null));\r
 446                         }\r
 447                         else if(definition instanceof Optional) {\r
 448                                 Optional def = (Optional)definition;\r
 449                                 if(handles[identity.resource] != 0) {\r
 450                                         Resource child = advisor.createChild(graph, this, builder.resource(handles[def.parent]), builder.resource(handles[identity.resource]), def.name);\r
 451                                         graph.claim(child, InstanceOf, null, Library); // ???\r
 452                                         handles[identity.resource] = builder.handle(child);\r
 453                                 } else {\r
 454                                         Resource child = advisor.createChild(graph, this, builder.resource(handles[def.parent]), null, def.name);\r
 455                                         graph.claim(child, InstanceOf, null, Library); // ???\r
 456                                         handles[identity.resource] = builder.handle(child);\r
 457                                 }\r
 458                         }\r
 459                 }               \r
 460                 \r
 461                 tg.getStatementCount();\r
 462                 tg.forStatements(null, new TransferableGraphSourceProcedure<int[]>() {\r
 463 \r
 464                         @Override\r
 465                         public void execute(int[] value) throws Exception {\r
 466                                 \r
 467                                 int sub = value[0];\r
 468                                 int pred = value[1];\r
 469                                 int inv = value[2];\r
 470                                 int obj = value[3];\r
 471 \r
 472                                 int subject = handles[sub];\r
 473                                 int predicate = handles[pred];\r
 474                                 int object = handles[obj];\r
 475 \r
 476                                 builder.addStatement(graph, subject, predicate, object);        \r
 477                                 if(inv >= 0) {\r
 478                                     int inverse = handles[inv];\r
 479                                     builder.addStatement(graph, object, inverse, subject);    \r
 480                                 }\r
 481                                 \r
 482                         }\r
 483                         \r
 484                 }); \r
 485                 \r
 486                 tg.getValueCount();\r
 487 \r
 488                 class ValueProcedure extends InputStream implements TransferableGraphSourceValueProcedure {\r
 489 \r
 490             private TGResourceUtil util = new TGResourceUtil();\r
 491                     private DataInput source;\r
 492 \r
 493             @Override\r
 494             public void execute(int _resource, Datatype type, DataInput stream) throws Exception {\r
 495 \r
 496                 source = stream;\r
 497 \r
 498                 //int file = _resource & 0x80000000;\r
 499                 int resource = _resource & 0x7FFFFFFF;\r
 500 \r
 501                 Binding binding = Bindings.getBinding(type);\r
 502                 Serializer s = Bindings.getSerializer(binding);\r
 503 \r
 504                 builder.beginValue(handles[resource]);\r
 505                 if(util.mayHaveResource(type)) {\r
 506                     Object value = s.deserialize(stream);\r
 507                     util.adaptValue( binding,  value, new LongAdapter() {\r
 508                                 @Override\r
 509                                 public long adapt(long in) {\r
 510                                     try {\r
 511                                         return ss.getRandomAccessId(handles[(int)in]);\r
 512                                     } catch (DatabaseException e) {\r
 513                                         throw new IllegalStateException(e);\r
 514                                     }\r
 515                                 }\r
 516                             });\r
 517                     byte[] bytes = s.serialize(value);\r
 518                     for(byte b : bytes) {\r
 519                         int val = b;\r
 520                         if(val < 0) val += 256;\r
 521                         builder.appendValue(val);\r
 522                     }\r
 523                 } else {\r
 524                     s.skip(this);\r
 525                 }\r
 526                 builder.endValue();\r
 527                 \r
 528             }\r
 529 \r
 530             @Override\r
 531             public int read() throws IOException {\r
 532                 int value = source.readUnsignedByte();\r
 533                 try {\r
 534                     builder.appendValue(value);\r
 535                 } catch (DatabaseException e) {\r
 536                     e.printStackTrace();\r
 537                 }\r
 538                 return value;\r
 539             }\r
 540 \r
 541             @Override\r
 542             public void rawCopy(int resource, int length, DataInput input) throws Exception {\r
 543                 builder.beginValue(handles[resource]);\r
 544                 for (int i = 0; i < length; ++i)\r
 545                     builder.appendValue(input.readUnsignedByte());\r
 546                 builder.endValue();\r
 547             }\r
 548 \r
 549                 };\r
 550                 \r
 551                 tg.forValues2(null, new ValueProcedure());\r
 552                 \r
 553         }\r
 554         \r
 555         @Override\r
 556         public long[] getResourceIds(SerialisationSupport serializer) throws DatabaseException {\r
 557                 final int count = handles.length;\r
 558                 long[] resourceIds = new long[count];\r
 559                 for(int i=0;i<count;++i)\r
 560                     resourceIds[i] = serializer.getRandomAccessId(handles[i]);\r
 561                 return resourceIds;\r
 562         }\r
 563 }