bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/Layer0Utils.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Association for Decentralized Information Management in
   3  * Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.db.layer0.util;
  13
  14 import java.io.IOException;
  15 import java.util.ArrayList;
  16 import java.util.Collection;
  17 import java.util.Collections;
  18 import java.util.Comparator;
  19 import java.util.HashSet;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.Set;
  23 import java.util.TreeSet;
  24
  25 import org.eclipse.core.runtime.IProgressMonitor;
  26 import org.eclipse.core.runtime.NullProgressMonitor;
  27 import org.eclipse.core.runtime.SubMonitor;
  28 import org.simantics.databoard.Bindings;
  29 import org.simantics.databoard.Datatypes;
  30 import org.simantics.databoard.adapter.AdaptException;
  31 import org.simantics.databoard.adapter.Adapter;
  32 import org.simantics.databoard.adapter.AdapterConstructionException;
  33 import org.simantics.databoard.binding.Binding;
  34 import org.simantics.databoard.binding.NumberBinding;
  35 import org.simantics.databoard.binding.StringBinding;
  36 import org.simantics.databoard.binding.error.BindingException;
  37 import org.simantics.databoard.binding.mutable.MutableStringBinding;
  38 import org.simantics.databoard.parser.repository.DataTypeSyntaxError;
  39 import org.simantics.databoard.parser.repository.DataValueRepository;
  40 import org.simantics.databoard.primitives.MutableString;
  41 import org.simantics.databoard.type.ArrayType;
  42 import org.simantics.databoard.type.BooleanType;
  43 import org.simantics.databoard.type.ByteType;
  44 import org.simantics.databoard.type.Datatype;
  45 import org.simantics.databoard.type.DoubleType;
  46 import org.simantics.databoard.type.FloatType;
  47 import org.simantics.databoard.type.IntegerType;
  48 import org.simantics.databoard.type.LongType;
  49 import org.simantics.databoard.type.MapType;
  50 import org.simantics.databoard.type.NumberType;
  51 import org.simantics.databoard.type.OptionalType;
  52 import org.simantics.databoard.type.RecordType;
  53 import org.simantics.databoard.type.StringType;
  54 import org.simantics.databoard.type.UnionType;
  55 import org.simantics.databoard.type.VariantType;
  56 import org.simantics.databoard.util.ObjectUtils;
  57 import org.simantics.datatypes.literal.GUID;
  58 import org.simantics.db.ChangeSetIdentifier;
  59 import org.simantics.db.Operation;
  60 import org.simantics.db.ReadGraph;
  61 import org.simantics.db.RelationContext;
  62 import org.simantics.db.Resource;
  63 import org.simantics.db.Session;
  64 import org.simantics.db.Statement;
  65 import org.simantics.db.WriteGraph;
  66 import org.simantics.db.WriteOnlyGraph;
  67 import org.simantics.db.common.CommentMetadata;
  68 import org.simantics.db.common.Indexing;
  69 import org.simantics.db.common.StandardStatement;
  70 import org.simantics.db.common.primitiverequest.PossibleRelatedValue;
  71 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
  72 import org.simantics.db.common.request.DelayedWriteRequest;
  73 import org.simantics.db.common.request.ObjectsWithType;
  74 import org.simantics.db.common.request.PossibleChild;
  75 import org.simantics.db.common.request.PossibleIndexRoot;
  76 import org.simantics.db.common.utils.NameUtils;
  77 import org.simantics.db.event.ChangeListener;
  78 import org.simantics.db.exception.CancelTransactionException;
  79 import org.simantics.db.exception.DatabaseException;
  80 import org.simantics.db.exception.ServiceException;
  81 import org.simantics.db.layer0.adapter.CopyHandler;
  82 import org.simantics.db.layer0.adapter.CopyHandler2;
  83 import org.simantics.db.layer0.adapter.GenericRelationIndex;
  84 import org.simantics.db.layer0.adapter.PasteHandler;
  85 import org.simantics.db.layer0.adapter.impl.DefaultPasteHandler;
  86 import org.simantics.db.layer0.adapter.impl.TGRemover;
  87 import org.simantics.db.layer0.genericrelation.IndexedRelations;
  88 import org.simantics.db.layer0.internal.SimanticsInternal;
  89 import org.simantics.db.layer0.migration.OntologiesFromLibrary;
  90 import org.simantics.db.layer0.property.OrderedResource;
  91 import org.simantics.db.layer0.request.GlobalOntologies;
  92 import org.simantics.db.layer0.request.PossibleVariableIndexRoot;
  93 import org.simantics.db.layer0.request.PropertyInfo;
  94 import org.simantics.db.layer0.request.PropertyInfoRequest;
  95 import org.simantics.db.layer0.util.SimanticsClipboard.Representation;
  96 import org.simantics.db.layer0.variable.StandardGraphPropertyVariable;
  97 import org.simantics.db.layer0.variable.Variable;
  98 import org.simantics.db.service.ClusterCollectorPolicy;
  99 import org.simantics.db.service.ClusterControl;
 100 import org.simantics.db.service.ClusteringSupport;
 101 import org.simantics.db.service.CollectionSupport;
 102 import org.simantics.db.service.DebugSupport;
 103 import org.simantics.db.service.GraphChangeListenerSupport;
 104 import org.simantics.db.service.ManagementSupport;
 105 import org.simantics.db.service.UndoRedoSupport;
 106 import org.simantics.db.service.XSupport;
 107 import org.simantics.graph.db.TransferableGraphSource;
 108 import org.simantics.graph.db.TransferableGraphs;
 109 import org.simantics.graph.diff.Diff;
 110 import org.simantics.graph.diff.TransferableGraphDelta1;
 111 import org.simantics.graph.refactoring.GraphRefactoringUtils;
 112 import org.simantics.graph.representation.PrettyPrintTG;
 113 import org.simantics.graph.representation.TransferableGraph1;
 114 import org.simantics.layer0.Layer0;
 115 import org.simantics.operation.Layer0X;
 116 import org.simantics.scl.compiler.environment.Environments;
 117 import org.simantics.scl.compiler.runtime.RuntimeEnvironment;
 118 import org.simantics.scl.compiler.top.SCLExpressionCompilationException;
 119 import org.simantics.scl.compiler.types.Type;
 120 import org.simantics.scl.osgi.SCLOsgi;
 121 import org.simantics.scl.runtime.function.Function;
 122 import org.simantics.scl.runtime.function.Function1;
 123 import org.simantics.scl.runtime.function.FunctionImpl1;
 124
 125 public class Layer0Utils {
 126
 127         @SuppressWarnings("rawtypes")
 128         public static final ThreadLocal SCL_GRAPH = new ThreadLocal();
 129
 130         final public static Binding datatype_binging = Bindings.getBindingUnchecked(Datatype.class);
 131
 132         public static Resource literal(WriteGraph g, String value) throws DatabaseException {
 133                 Layer0 L0 = Layer0.getInstance(g);
 134                 Resource r = g.newResource();
 135                 g.claimValue(r, value, Bindings.STRING);
 136                 g.claim(r, L0.InstanceOf, L0.String);
 137                 return r;
 138         }
 139
 140         public static Resource literal(WriteGraph g, double value) throws DatabaseException {
 141                 Layer0 L0 = Layer0.getInstance(g);
 142                 Resource r = g.newResource();
 143                 g.claimValue(r, value, Bindings.DOUBLE);
 144                 g.claim(r, L0.InstanceOf, L0.Double);
 145                 return r;
 146         }
 147
 148         public static Resource literal(WriteGraph g, int value) throws DatabaseException {
 149                 Layer0 L0 = Layer0.getInstance(g);
 150                 Resource r = g.newResource();
 151                 g.claimValue(r, value, Bindings.INTEGER);
 152                 g.claim(r, L0.InstanceOf, L0.Integer);
 153                 return r;
 154         }
 155
 156         public static void assert_(WriteGraph g, Resource type, Resource predicate, Resource object) throws DatabaseException {
 157                 Layer0 L0 = Layer0.getInstance(g);
 158                 Resource assertion = g.newResource();
 159                 g.claim(type, L0.Asserts, assertion);
 160                 g.claim(assertion, L0.InstanceOf, L0.Assertion);
 161                 g.claim(assertion, L0.HasPredicate, predicate);
 162                 g.claim(assertion, L0.HasObject, object);
 163         }
 164
 165         public static Resource relation(WriteGraph g, Resource parent, String name, Resource superrelation) throws DatabaseException {
 166                 Layer0 L0 = Layer0.getInstance(g);
 167                 Resource relation = g.newResource();
 168                 g.claim(relation, L0.SubrelationOf, superrelation);
 169                 g.claim(relation, L0.HasName, literal(g, name));
 170                 g.claim(parent, L0.ConsistsOf, relation);
 171
 172                 Resource superrelationInverse = g.getInverse(superrelation);
 173                 if(superrelationInverse != null) {
 174                         Resource inverse = g.newResource();
 175                         g.claim(inverse, L0.SubrelationOf, superrelationInverse);
 176                         g.claim(relation, L0.ConsistsOf, inverse);
 177                         g.claim(inverse, L0.HasName, literal(g, "Inverse"));
 178                 }
 179                 return relation;
 180         }
 181
 182         private static Resource getLiteralType(ReadGraph graph, Datatype type) throws DatabaseException {
 183                 Layer0 L0 = Layer0.getInstance(graph);
 184                 if(type instanceof DoubleType) return L0.Double;
 185                 else if(type instanceof StringType) return L0.String;
 186                 else if(type instanceof IntegerType) return L0.Integer;
 187                 else if(type instanceof LongType) return L0.Long;
 188                 else if(type instanceof FloatType) return L0.Float;
 189                 else if(type instanceof ByteType) return L0.Byte;
 190                 else if(type instanceof BooleanType) return L0.Boolean;
 191                 else if(type instanceof ArrayType) {
 192                         ArrayType at = (ArrayType)type;
 193                         if(at.componentType instanceof DoubleType) return L0.DoubleArray;
 194                         else if(at.componentType instanceof StringType) return L0.StringArray;
 195                         else if(at.componentType instanceof IntegerType) return L0.IntegerArray;
 196                         else if(at.componentType instanceof LongType) return L0.LongArray;
 197                         else if(at.componentType instanceof FloatType) return L0.FloatArray;
 198                         else if(at.componentType instanceof ByteType) return L0.ByteArray;
 199                         else if(at.componentType instanceof BooleanType) return L0.BooleanArray;
 200                         else if(at.componentType instanceof VariantType) return L0.VariantArray;
 201                 }
 202                 throw new DatabaseException("Unidentified literal type for datatype " + type);
 203         }
 204
 205         private static Resource getPossibleLiteralType(ReadGraph graph, String type) throws DatabaseException {
 206
 207                 Layer0 L0 = Layer0.getInstance(graph);
 208                 if("Double".equals(type)) return L0.Double;
 209                 else if("String".equals(type)) return L0.String;
 210                 else if("Integer".equals(type)) return L0.Integer;
 211                 else if("Long".equals(type)) return L0.Long;
 212                 else if("Float".equals(type)) return L0.Float;
 213                 else if("Byte".equals(type)) return L0.Byte;
 214                 else if("Boolean".equals(type)) return L0.Boolean;
 215                 else if("[Double]".equals(type)) return L0.DoubleArray;
 216                 else if("[String]".equals(type)) return L0.StringArray;
 217                 else if("[Integer]".equals(type)) return L0.IntegerArray;
 218                 else if("[Long]".equals(type)) return L0.LongArray;
 219                 else if("[Float]".equals(type)) return L0.FloatArray;
 220                 else if("[Byte]".equals(type)) return L0.ByteArray;
 221                 else if("[Boolean]".equals(type)) return L0.BooleanArray;
 222                 else if("[Variant]".equals(type)) return L0.VariantArray;
 223                 else if("Array Double".equals(type)) return L0.DoubleArray;
 224                 else if("Array String".equals(type)) return L0.StringArray;
 225                 else if("Array Integer".equals(type)) return L0.IntegerArray;
 226                 else if("Array Long".equals(type)) return L0.LongArray;
 227                 else if("Array Float".equals(type)) return L0.FloatArray;
 228                 else if("Array Byte".equals(type)) return L0.ByteArray;
 229                 else if("Array Boolean".equals(type)) return L0.BooleanArray;
 230                 else if("Array Variant".equals(type)) return L0.VariantArray;
 231                 else if("Vector Double".equals(type)) return L0.DoubleArray;
 232                 else if("Vector String".equals(type)) return L0.StringArray;
 233                 else if("Vector Integer".equals(type)) return L0.IntegerArray;
 234                 else if("Vector Long".equals(type)) return L0.LongArray;
 235                 else if("Vector Float".equals(type)) return L0.FloatArray;
 236                 else if("Vector Byte".equals(type)) return L0.ByteArray;
 237                 else if("Vector Boolean".equals(type)) return L0.BooleanArray;
 238                 else if("Vector Variant".equals(type)) return L0.VariantArray;
 239                 else if("Datatype".equals(type)) return L0.DataType;
 240                 else if("Variant".equals(type)) return L0.Variant;
 241                 else return null;
 242         }
 243
 244         public static Resource getPossibleLiteralType(ReadGraph graph, Variable variable) throws DatabaseException {
 245                 Resource predicate = variable.getPossiblePredicateResource(graph);
 246                 if(predicate == null) return null;
 247                 return getPossibleLiteralType(graph, predicate);
 248         }
 249
 250         public static Resource getLiteralType(ReadGraph graph, Variable variable) throws DatabaseException {
 251                 Resource result = getPossibleLiteralType(graph, variable);
 252                 if(result == null) throw new DatabaseException("Unidentified literal type for variable " + variable.getURI(graph));
 253                 return result;
 254         }
 255
 256         public static Resource getLiteralType(ReadGraph graph, Resource property) throws DatabaseException {
 257                 Resource result = getPossibleLiteralType(graph, property);
 258                 if(result == null) throw new DatabaseException("Unidentified literal type for property " + graph.getURI(property));
 259                 return result;
 260         }
 261
 262         public static Resource getPossibleLiteralType(ReadGraph graph, Resource property) throws DatabaseException {
 263
 264                 Layer0 L0 = Layer0.getInstance(graph);
 265                 Layer0X L0X = Layer0X.getInstance(graph);
 266
 267                 Resource defaultLiteralType = graph.getPossibleObject(property, L0.HasDefaultLiteralType);
 268                 if(defaultLiteralType != null) return defaultLiteralType;
 269
 270                 Resource range = graph.getPossibleObject(property, L0.HasRange);
 271                 if(range != null && !L0.Value.equals(range)) return range;
 272
 273                 Datatype requiredDataType = graph.getPossibleRelatedValue(property, L0X.RequiresDataType, datatype_binging);
 274                 if(requiredDataType != null) return getLiteralType(graph, requiredDataType);
 275
 276                 String requiredValueType = graph.getPossibleRelatedValue(property, L0.RequiresValueType, Bindings.STRING);
 277                 if(requiredValueType == null) return null;
 278
 279                 return getPossibleLiteralType(graph, requiredValueType);
 280
 281         }
 282
 283         /**
 284          * @param type any data type definition
 285          * @return SCL type that matches the specified data type on a basic level.
 286          *         Data type metadata is/cannot be converted into SCL types.
 287          * @throws IllegalArgumentException
 288          *             if the input datatype can't be converted into an SCL type
 289          */
 290         public static String getSCLType(Datatype type) throws IllegalArgumentException {
 291                 return buildSCLType(type, null).toString();
 292         }
 293
 294         /**
 295          * Only used internally by {@link #buildSCLType(Datatype, StringBuilder)}
 296          * @param s
 297          * @param toBuilder
 298          * @return
 299          * @see #buildSCLType(Datatype, StringBuilder)
 300          */
 301         private static StringBuilder append(StringBuilder toBuilder, String s) {
 302                 return toBuilder != null ? toBuilder.append(s) : new StringBuilder(s);
 303         }
 304
 305         private static CharSequence append(CharSequence to, String s) {
 306                 if (to instanceof StringBuilder)
 307                         return ((StringBuilder) to).append(s);
 308                 return new StringBuilder(to.length() + s.length()).append(to).append(s);
 309         }
 310
 311         private static CharSequence stringOrBuilder(StringBuilder toBuilder, String s) {
 312                 return toBuilder != null ? toBuilder.append(s) : s;
 313         }
 314
 315         /**
 316          * @param type any data type definition
 317          * @return SCL type that matches the specified data type on a basic level.
 318          *         Data type metadata is/cannot be converted into SCL types.
 319          * @throws IllegalArgumentException
 320          *             if the input datatype can't be converted into an SCL type
 321          */
 322         private static CharSequence buildSCLType(Datatype type, StringBuilder result) throws IllegalArgumentException {
 323                 if(type instanceof DoubleType) return stringOrBuilder(result, "Double");
 324                 else if(type instanceof StringType) return stringOrBuilder(result, "String");
 325                 else if(type instanceof IntegerType) return stringOrBuilder(result, "Integer");
 326                 else if(type instanceof FloatType) return stringOrBuilder(result, "Float");
 327                 else if(type instanceof BooleanType) return stringOrBuilder(result, "Boolean");
 328                 else if(type instanceof ByteType) return stringOrBuilder(result, "Byte");
 329                 else if(type instanceof LongType) return stringOrBuilder(result, "Long");
 330                 else if(type instanceof VariantType) return stringOrBuilder(result, "Variant");
 331                 else if(type instanceof ArrayType) {
 332                         ArrayType at = (ArrayType) type;
 333                         // Optimization to prevent allocations in the most basic array cases
 334                         if(at.componentType instanceof DoubleType) return stringOrBuilder(result, "Vector Double");
 335                         else if(at.componentType instanceof StringType) return stringOrBuilder(result, "Vector String");
 336                         else if(at.componentType instanceof IntegerType) return stringOrBuilder(result, "Vector Integer");
 337                         else if(at.componentType instanceof FloatType) return stringOrBuilder(result, "Vector Float");
 338                         else if(at.componentType instanceof BooleanType) return stringOrBuilder(result, "Vector Boolean");
 339                         else if(at.componentType instanceof ByteType) return stringOrBuilder(result, "Vector Byte");
 340                         else if(at.componentType instanceof LongType) return stringOrBuilder(result, "Vector Long");
 341                         else if(at.componentType instanceof VariantType) return stringOrBuilder(result, "Vector Variant");
 342                         else return buildSCLType(at.componentType, append(result, "Vector "));
 343                 } else if(type instanceof OptionalType) {
 344                         OptionalType ot = (OptionalType) type;
 345                         return append(buildSCLType(ot.componentType, append(result, "Maybe (")), ")");
 346                 } else if (type instanceof RecordType) {
 347                         throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 348                 } else if (type instanceof MapType) {
 349                         throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 350                 } else if (type instanceof UnionType) {
 351                         throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 352                 }
 353                 throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 354         }
 355
 356
 357         public static Type getSCLType(ReadGraph graph, RuntimeEnvironment runtimeEnvironment, String typeText) throws DatabaseException {
 358         try {
 359                         return Environments.getType(runtimeEnvironment.getEnvironment(), typeText);
 360                 } catch (SCLExpressionCompilationException e) {
 361                         throw new DatabaseException(e);
 362                 }
 363         }
 364
 365         public static Type getSCLType(ReadGraph graph, Variable property) throws DatabaseException {
 366
 367                 RuntimeEnvironment runtimeEnvironment = graph.syncRequest(new RuntimeEnvironmentRequest(property.getIndexRoot(graph)));
 368                 return getSCLType(graph, runtimeEnvironment, getSCLTypeString(graph, property));
 369
 370         }
 371
 372
 373         public static String getSCLTypeString(ReadGraph graph, Variable context) throws DatabaseException {
 374                 return getSCLTypeString(graph, context.getPossiblePredicateResource(graph), context.getRepresents(graph));
 375         }
 376
 377
 378         public static String getSCLTypeString(ReadGraph graph, Resource predicate, Resource value) throws DatabaseException {
 379
 380                 if(predicate != null) {
 381                     String requiredValueTypes = graph.getPossibleRelatedValue(predicate, Layer0.getInstance(graph).RequiresValueType, Bindings.STRING);
 382                     if(requiredValueTypes != null)
 383                         return requiredValueTypes;
 384                 }
 385
 386                 Layer0 L0 = Layer0.getInstance(graph);
 387                 Layer0X L0X = Layer0X.getInstance(graph);
 388
 389                 Datatype literalDatatype = graph.getPossibleRelatedValue(value, L0.HasDataType, datatype_binging);
 390                 if(literalDatatype != null) return getSCLType(literalDatatype);
 391
 392                 String literalValueType = graph.getPossibleRelatedValue(value, L0.HasValueType, Bindings.STRING);
 393                 if(literalValueType != null) return literalValueType;
 394
 395                 if(predicate != null) {
 396
 397                         Datatype requiredDataType = graph.getPossibleRelatedValue(predicate, L0X.RequiresDataType, datatype_binging);
 398                         if(requiredDataType != null) return getSCLType(requiredDataType);
 399
 400                         throw new DatabaseException("Unidentified literal data type for property " + NameUtils.getURIOrSafeNameInternal(graph, predicate));
 401
 402                 }
 403
 404                 throw new DatabaseException("Unidentified literal data type");
 405
 406         }
 407
 408         public static Datatype getDatatype(ReadGraph graph, Variable variable) throws DatabaseException {
 409                 Datatype result = getPossibleDatatype(graph, variable);
 410                 if(result != null) return result;
 411                 throw new DatabaseException("Unidentified literal data type for property " + variable.getURI(graph));
 412         }
 413
 414         public static Datatype getPossibleDatatype(ReadGraph graph, Variable variable) throws DatabaseException {
 415
 416                 Layer0 L0 = Layer0.getInstance(graph);
 417                 Layer0X L0X = Layer0X.getInstance(graph);
 418
 419                 Resource property = variable.getPossiblePredicateResource(graph);
 420                 if(property != null) {
 421 //                      Datatype requiredDataType = graph.getPossibleRelatedValue(property, L0X.RequiresDataType, datatype_binging);
 422                         Datatype requiredDataType = graph.syncRequest(new PossibleRelatedValue<Datatype>(property, L0X.RequiresDataType, datatype_binging));
 423                         if(requiredDataType != null) return requiredDataType;
 424                 }
 425
 426                 Resource literal = variable.getPossibleRepresents(graph);
 427                 if(literal != null) {
 428                     Datatype literalDatatype = graph.getPossibleRelatedValue2(literal, L0.HasDataType, new StandardGraphPropertyVariable(graph, variable, null, literal, L0.HasDataType), datatype_binging);
 429                     if(literalDatatype != null) return literalDatatype;
 430                 }
 431
 432                 if(property != null) {
 433
 434                         String requiredValueType = graph.getPossibleRelatedValue(property, L0.RequiresValueType, Bindings.STRING);
 435                         if(requiredValueType != null) {
 436                                 Datatype datatype = getPossibleDatatypeForValueType(requiredValueType);
 437                                 if(datatype != null) return datatype;
 438                         }
 439
 440                         Resource subject = variable.getParent(graph).getPossibleRepresents(graph);
 441                         if(subject != null) {
 442                                 Set<Resource> asses = new HashSet<Resource>();
 443                                 for(Resource type : graph.getTypes(subject)) {
 444                                         asses.addAll(graph.getAssertedObjects(type, property));
 445                                 }
 446                                 if(asses.size() == 1) {
 447                                         Resource ass = asses.iterator().next();
 448                                         Datatype dt = graph.getPossibleRelatedValue(ass, L0.HasDataType, Bindings.getBindingUnchecked(Datatype.class));
 449                                         if(dt != null) return dt;
 450                                 }
 451                         }
 452
 453                 }
 454
 455                 return null;
 456
 457         }
 458
 459         private static Datatype getPossibleDatatypeForValueType(String requiredValueType) throws DatabaseException {
 460
 461                 String[] split = requiredValueType.split(" ");
 462                 String arrayType = null;
 463                 if(split.length == 2 && "Array".equals(split[0])) {
 464                         arrayType = split[1];
 465                 } else if(requiredValueType.startsWith("[") && requiredValueType.endsWith("]")) {
 466                         arrayType = requiredValueType.substring(1, requiredValueType.length()-1);
 467                 }
 468
 469                 if(arrayType != null) {
 470                         Datatype arrayDataType = getArrayDataTypeForType(arrayType);
 471                         if(arrayDataType != null)
 472                                 return arrayDataType;
 473                 }
 474
 475                 Datatype dt = Datatypes.getDatatype(requiredValueType);
 476                 if(dt != null) return dt;
 477
 478                 try {
 479                         return Datatypes.translate(requiredValueType);
 480                 } catch (DataTypeSyntaxError e) {
 481                         return null;
 482                 }
 483
 484
 485         }
 486
 487         private static Datatype getArrayDataTypeForType(String type) {
 488                 if("Double".equals(type)) return Datatypes.DOUBLE_ARRAY;
 489                 else if("String".equals(type)) return Datatypes.STRING_ARRAY;
 490                 else if("Integer".equals(type)) return Datatypes.INTEGER_ARRAY;
 491                 else if("Long".equals(type)) return Datatypes.LONG_ARRAY;
 492                 else if("Float".equals(type)) return Datatypes.FLOAT_ARRAY;
 493                 else if("Byte".equals(type)) return Datatypes.BYTE_ARRAY;
 494                 else if("Boolean".equals(type)) return Datatypes.BOOLEAN_ARRAY;
 495                 else if("Variant".equals(type)) return Datatypes.VARIANT_ARRAY;
 496                 return null;
 497         }
 498
 499         public static Binding getDefaultBinding(ReadGraph graph, Variable variable) throws DatabaseException {
 500
 501                 Resource property = variable.getPossiblePredicateResource(graph);
 502                 if(property != null) {
 503                         PropertyInfo info = graph.syncRequest(new PropertyInfoRequest(property), TransientCacheAsyncListener.<PropertyInfo>instance());
 504                         if(info.defaultBinding != null) return info.defaultBinding;
 505                 }
 506
 507                 Datatype type = getDatatype(graph, variable);
 508                 if (type == null)
 509                         throw new DatabaseException("No datatype available for variable " + variable.getURI(graph));
 510                 return Bindings.getBinding(type);
 511
 512         }
 513
 514         public static Binding getPossibleDefaultBinding(ReadGraph graph, Variable variable) throws DatabaseException {
 515
 516                 Resource property = variable.getPossiblePredicateResource(graph);
 517                 if(property != null) {
 518                         PropertyInfo info = graph.syncRequest(new PropertyInfoRequest(property), TransientCacheAsyncListener.<PropertyInfo>instance());
 519                         if(info.defaultBinding != null) return info.defaultBinding;
 520                 }
 521
 522                 Datatype type = getPossibleDatatype(graph, variable);
 523                 if (type == null) return null;
 524
 525                 return Bindings.getBinding(type);
 526
 527         }
 528
 529         public static String getPossibleUnit(Datatype dt) {
 530                 if (dt == null)
 531                         return null;
 532                 else if (dt instanceof NumberType) {
 533                         return ((NumberType) dt).getUnit();
 534                 } else if (dt instanceof ArrayType) {
 535                         ArrayType at = (ArrayType) dt;
 536                         Datatype cdt = at.componentType();
 537                         if (cdt instanceof NumberType) {
 538                                 return ((NumberType) cdt).getUnit();
 539                         }
 540                 }
 541                 return null;
 542
 543         }
 544
 545         public static String getUnit(ReadGraph graph, Variable variable) throws DatabaseException {
 546
 547                 Layer0 L0 = Layer0.getInstance(graph);
 548                 Layer0X L0X = Layer0X.getInstance(graph);
 549
 550                 Resource literal = variable.getPossibleRepresents(graph);
 551                 if(literal == null)
 552                     return "";
 553
 554                 Datatype literalDatatype = graph.getPossibleRelatedValue2(literal, L0.HasDataType, new StandardGraphPropertyVariable(graph, variable, null, literal, L0.HasDataType), datatype_binging);
 555                 if(literalDatatype != null) {
 556                         String unit = getPossibleUnit(literalDatatype);
 557                         if(unit != null) return unit;
 558                 }
 559
 560                 Resource property = variable.getPossiblePredicateResource(graph);
 561                 if(property != null) {
 562
 563                         Datatype requiredDataType = graph.getPossibleRelatedValue(property, L0X.RequiresDataType, datatype_binging);
 564                         if(requiredDataType != null) {
 565                                 String unit = getPossibleUnit(requiredDataType);
 566                                 if(unit != null) return unit;
 567                         }
 568
 569                 }
 570
 571                 return "";
 572
 573         }
 574
 575         public static void claimAdaptedValue(WriteGraph graph, Resource objectResource, Object value, Binding binding, Datatype targetDatatype) throws DatabaseException {
 576
 577                 try {
 578
 579                         Datatype sourceDatatype = binding.type();
 580                         if(sourceDatatype.equals(targetDatatype)) {
 581                                 graph.claimValue(objectResource, value, binding);
 582                         } else {
 583                                 Binding target = Bindings.getBinding(targetDatatype);
 584                                 Adapter adapter = Bindings.getTypeAdapter(binding, target);
 585                                 graph.claimValue(objectResource, adapter.adapt(value), target);
 586                         }
 587
 588                 } catch (AdapterConstructionException e) {
 589                         throw new DatabaseException(e);
 590                 } catch (AdaptException e) {
 591                         throw new DatabaseException(e);
 592                 }
 593
 594         }
 595
 596         public static String toString(Object value, Binding binding) throws DatabaseException {
 597                 try {
 598                         if(value instanceof String) return (String)value;
 599                         StringBuilder sb = new StringBuilder();
 600                         DataValueRepository rep = new DataValueRepository();
 601                         binding.printValue(value, sb, rep, false);
 602                         return sb.toString();
 603                 } catch (BindingException e) {
 604                         throw new DatabaseException(e);
 605                 } catch (IOException e) {
 606                         throw new DatabaseException(e);
 607                 }
 608         }
 609
 610         public static Object parseValue(String text, Binding binding) throws DatabaseException {
 611                 try {
 612                         if(binding.isInstance(text)) return text;
 613                         DataValueRepository rep = new DataValueRepository();
 614                         return binding.parseValue(text, rep);
 615                 } catch (BindingException e) {
 616                         throw new DatabaseException(e);
 617                 } catch (DataTypeSyntaxError e) {
 618                         throw new DatabaseException(e);
 619                 }
 620         }
 621
 622         @SuppressWarnings("unchecked")
 623         public static <T> T getValueAdaptedToBinding(ReadGraph graph, Resource literal, Binding targetBinding) throws DatabaseException {
 624                 Datatype sourceDatatype = graph.getDataType(literal);
 625                 Datatype targetDatatype = targetBinding.type();
 626                 if (sourceDatatype.equals(targetDatatype))
 627                         return graph.getValue(literal, targetBinding);
 628
 629                 Binding sourceBinding = Bindings.getBinding(sourceDatatype);
 630                 try {
 631                         Adapter adapter = Bindings.adapterFactory.getAdapter(Bindings.getBinding(sourceDatatype), targetBinding, true, false);
 632                         Object value = graph.getValue(literal, sourceBinding);
 633                         return (T) adapter.adaptUnchecked(value);
 634                 } catch (AdapterConstructionException e) {
 635                         throw new DatabaseException(e);
 636                 }
 637         }
 638
 639         public static Statement getStatementInLocal(Resource subject, Statement statement) {
 640                 if(statement.isAsserted(subject)) return new StandardStatement(subject, statement.getPredicate(), statement.getObject());
 641                 else return statement;
 642         }
 643
 644         public static Resource browsePossible(ReadGraph graph, Resource root, String suffix) throws DatabaseException {
 645                 return graph.getPossibleResource(graph.getURI(root) + suffix);
 646         }
 647
 648         public static Resource getPossibleChild(ReadGraph graph, Resource resource, String name) throws DatabaseException {
 649                 return graph.sync(new PossibleChild(resource, name));
 650         }
 651
 652         public static Resource getPossibleChild(ReadGraph graph, Resource resource, Resource type, String name) throws DatabaseException {
 653                 Resource child = graph.sync(new PossibleChild(resource, name));
 654                 if(child == null) return null;
 655                 if(!graph.isInstanceOf(child, type)) return null;
 656                 return child;
 657         }
 658
 659         public static RelationContext relationContext(ReadGraph graph, Resource subject, Resource predicate) throws DatabaseException {
 660                 Statement stm = graph.getSingleStatement(subject, predicate);
 661                 return new RelationContextImpl(subject, stm);
 662         }
 663
 664         public static RelationContext relationContext(Statement stm) throws DatabaseException {
 665                 return new RelationContextImpl(stm.getSubject(), stm);
 666         }
 667
 668         public static <T> T valueInRelationContext(ReadGraph graph, Resource subject, Statement stm) throws DatabaseException {
 669                 return graph.getValue2(subject, Layer0Utils.relationContext(stm));
 670         }
 671
 672         public static <T> T valueInRelationContext(ReadGraph graph, Resource subject, Statement stm, Binding binding) throws DatabaseException {
 673                 return graph.getValue2(subject, Layer0Utils.relationContext(stm), binding);
 674         }
 675
 676         public static <T> T relatedValueInRelationContext(ReadGraph graph, Resource subject, Resource relation) throws DatabaseException {
 677                 Statement stm = getStatementInLocal(subject, graph.getSingleStatement(subject, relation));
 678                 return valueInRelationContext(graph, stm.getObject(), stm);
 679         }
 680
 681         public static <T> T relatedValueInRelationContext(ReadGraph graph, Resource subject, Resource relation, Binding binding) throws DatabaseException {
 682                 Statement stm = getStatementInLocal(subject, graph.getSingleStatement(subject, relation));
 683                 return valueInRelationContext(graph, stm.getObject(), stm, binding);
 684         }
 685
 686         public static Statement possibleObtainedStatementInternal(ReadGraph graph, Resource subject, Resource relation) throws DatabaseException {
 687
 688                 Layer0X L0X = Layer0X.getInstance(graph);
 689
 690                 for(Resource ob : graph.getObjects(subject, L0X.DefinesObtainedStatement)) {
 691                         Resource pred = graph.getSingleObject(ob, L0X.ObtainedStatement_predicate);
 692                         if(graph.isSubrelationOf(pred, relation)) {
 693                                 Resource object = graph.getSingleObject(ob, L0X.ObtainedStatement_object);
 694                                 return new StandardStatement(subject, pred, object);
 695                         }
 696                 }
 697
 698                 ArrayList<OrderedResource> order = new ArrayList<OrderedResource>();
 699                 for(Statement stm : graph.getStatements(subject, L0X.ObtainsProperty)) {
 700                         Integer position = graph.getRelatedValue(stm.getPredicate(), L0X.NaturalNumberOrderRelation, Bindings.INTEGER);
 701                         order.add(new OrderedResource(position, stm.getObject()));
 702                 }
 703
 704                 for(OrderedResource or : order) {
 705                         Statement stm = possibleObtainedStatementInternal(graph, or.r, relation);
 706                         if(stm != null) return stm;
 707                 }
 708
 709                 return null;
 710
 711         }
 712
 713         public static <T> T possibleObtainedValue(ReadGraph graph, RelationContext ctx, Binding binding) throws DatabaseException {
 714
 715                 Statement stm = ctx.getStatement();
 716                 Statement obj = Layer0Utils.possibleObtainedStatementInternal(graph, stm.getSubject(), stm.getPredicate());
 717
 718                 if(obj != null) {
 719                         return Layer0Utils.valueInRelationContext(graph, obj.getObject(), obj, binding);
 720                 } else {
 721                         return null;
 722                 }
 723
 724         }
 725
 726         public static void addObtainedStatement(WriteGraph graph, Resource subject, Resource predicate, Resource object) throws DatabaseException {
 727                 Layer0 L0 = Layer0.getInstance(graph);
 728                 Layer0X L0X = Layer0X.getInstance(graph);
 729                 Resource ob = graph.newResource();
 730                 graph.claim(ob, L0.InstanceOf, null, L0X.ObtainedStatement);
 731                 graph.claim(ob, L0X.ObtainedStatement_predicate, null, predicate);
 732                 graph.claim(ob, L0X.ObtainedStatement_object, null, object);
 733                 graph.claim(subject, L0X.DefinesObtainedStatement, null, ob);
 734         }
 735
 736         public static void addObtainedValue(WriteGraph graph, Resource subject, Resource predicate, Resource type, Object value, Binding binding) throws DatabaseException {
 737                 Layer0 L0 = Layer0.getInstance(graph);
 738                 Resource object = graph.newResource();
 739                 graph.claim(object, L0.InstanceOf, type);
 740                 graph.claimValue(object, value, binding);
 741                 Layer0Utils.addObtainedStatement(graph, subject, predicate, object);
 742         }
 743
 744         //-------------------------------------------------------------------------
 745         // Indexing state query utilities idle handling utilities
 746         //-------------------------------------------------------------------------
 747
 748         /**
 749          * This method waits until the indexing engine becomes idle.
 750          * @since 1.8
 751          */
 752         public static void waitIndexPending() {
 753                 Indexing.waitIndexPending();
 754         }
 755
 756         /**
 757          * @param graph an active database write handle to prove one is in a write
 758          *        transaction and wants to disable dependencies indexing for this
 759          *        transaction only.
 760          * @return previous value
 761          * @since 1.8
 762          */
 763         public static boolean setDependenciesIndexingDisabled(WriteOnlyGraph graph, boolean disabled) {
 764                 return Indexing.setDependenciesIndexingDisabled(graph, disabled);
 765         }
 766
 767         public static String undo() throws DatabaseException {
 768
 769             Session session = SimanticsInternal.getSession();
 770
 771         UndoRedoSupport support = session.getService(UndoRedoSupport.class);
 772
 773         List<Operation> ops = support.undoAndReturnOperations(session, 1);
 774         if(ops.isEmpty())
 775             return "Undo history is empty.";
 776
 777         Operation mainOperation = ops.get(0);
 778
 779         long csId = mainOperation.getCSId();
 780
 781         ManagementSupport management = session.getService(ManagementSupport.class);
 782         Collection<ChangeSetIdentifier> ids = management.getChangeSetIdentifiers(csId, csId);
 783
 784         return "Undo reverted " + ids.size() + " change sets.";
 785
 786         }
 787
 788         public static String undoOperations(int amountOfOperations) throws DatabaseException {
 789
 790             Session session = SimanticsInternal.getSession();
 791
 792         UndoRedoSupport support = session.getService(UndoRedoSupport.class);
 793
 794         List<Operation> ops = support.undoAndReturnOperations(session, amountOfOperations);
 795         if(ops.isEmpty())
 796             return "Undo history is empty.";
 797
 798         Operation mainOperation = ops.get(0);
 799
 800         long csId = mainOperation.getCSId();
 801
 802         ManagementSupport management = session.getService(ManagementSupport.class);
 803         Collection<ChangeSetIdentifier> ids = management.getChangeSetIdentifiers(csId, csId);
 804
 805         return "Undo reverted " + ids.size() + " change sets.";
 806
 807         }
 808
 809         public static String redo() throws DatabaseException {
 810
 811             Session session = SimanticsInternal.getSession();
 812
 813         UndoRedoSupport support = session.getService(UndoRedoSupport.class);
 814
 815         List<Operation> ops = support.redo(session, 1);
 816         if(ops.isEmpty())
 817             return "Redo history is empty.";
 818
 819         Operation mainOperation = ops.get(0);
 820
 821         long csId = mainOperation.getCSId();
 822
 823         ManagementSupport management = session.getService(ManagementSupport.class);
 824         Collection<ChangeSetIdentifier> ids = management.getChangeSetIdentifiers(csId, csId);
 825
 826         return "Redo redid " + ids.size() + " change sets.";
 827
 828         }
 829
 830         public static String getComment(Session session, ChangeSetIdentifier id) {
 831             byte[] data = id.getMetadata().get(CommentMetadata.class.getName());
 832             if(data == null)
 833                 return "Undescribed operation.";
 834             String comment = CommentMetadata.deserialise(session, data).toString().trim();
 835             if(comment.isEmpty())
 836                 return "Undescribed operation.";
 837             return comment;
 838         }
 839
 840     /**
 841      * This method adds CommentMetadata for write transaction. CommentMetadata is used e.g. in Undo view.
 842      * @param graph
 843      *    graph handle
 844      * @param string
 845      *    comment
 846      * @throws ServiceException
 847      */
 848     public static void addCommentMetadata(WriteOnlyGraph graph, String string) throws ServiceException {
 849         // Add a comment to metadata.
 850         CommentMetadata cm = graph.getMetadata(CommentMetadata.class);
 851         graph.addMetadata(cm.add(ObjectUtils.toString(string)));
 852     }
 853
 854         //-------------------------------------------------------------------------
 855
 856         /**
 857          * Copy the specified source resource into the specified container using the
 858          * specified write transaction handle.
 859          *
 860          * @param graph write transaction handle
 861          * @param targetContainer target container resource of the created copy. The
 862          *        exact logic of how the copy will be contained by the target
 863          *        container is up to the PasteHandler to decide
 864          * @param source the source resource to copy
 865          * @throws DatabaseException
 866          * @since 1.8
 867          */
 868         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, Resource source) throws DatabaseException {
 869                 return copyTo(graph, targetContainer, source, null, null, null);
 870         }
 871
 872         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, Resource source, PasteEventHandler handler) throws DatabaseException {
 873                 return copyTo(graph, targetContainer, source, handler, null, null);
 874         }
 875
 876         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, Resource source, PasteEventHandler handler, CopyHandler copyHandler, PasteHandler pasteHandler) throws DatabaseException {
 877                 if(copyHandler == null) copyHandler = graph.adapt(source, CopyHandler.class);
 878                 return copyTo(graph, targetContainer, handler, copyHandler, pasteHandler);
 879         }
 880
 881         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, PasteEventHandler handler, CopyHandler copyHandler, PasteHandler pasteHandler) throws DatabaseException {
 882                 SimanticsClipboardImpl clipboard = new SimanticsClipboardImpl();
 883                 copyHandler.copyToClipboard(graph, clipboard);
 884                 if(targetContainer != null) {
 885                         if(pasteHandler == null) pasteHandler = graph.adapt(targetContainer, PasteHandler.class);
 886                         return pasteHandler.pasteFromClipboard(graph, clipboard, handler);
 887                 } else {
 888                         DefaultPasteHandler ph = new DefaultPasteHandler(null);
 889                         return ph.pasteFromClipboard(graph, clipboard, handler);
 890                 }
 891         }
 892
 893         public static CopyHandler2 getPossibleCopyHandler(ReadGraph graph, Collection<Resource> rs) throws DatabaseException {
 894         CopyHandler2 ch = null;
 895         for(Resource r : rs) {
 896             if(ch == null) {
 897                 CopyHandler ch2_ = graph.adapt(r, CopyHandler.class);
 898                 if(ch2_ instanceof CopyHandler2) {
 899                     ch = (CopyHandler2)ch2_;
 900                 }
 901             } else {
 902                 CopyHandler ch2_ = graph.adapt(r, CopyHandler.class);
 903                 if(ch2_ instanceof CopyHandler2) {
 904                     CopyHandler2 ch2 = (CopyHandler2)ch2_;
 905                     ch = ch.combine(ch2);
 906                 }
 907             }
 908         }
 909         return ch;
 910         }
 911
 912         public static ClusterCollectorPolicy setClusterCollectorPolicy(ClusterCollectorPolicy policy) {
 913                 Session session = SimanticsInternal.getSession();
 914                 ClusterControl cc = session.getService(ClusterControl.class);
 915                 return cc.setPolicy(policy);
 916         }
 917
 918         private static String decodeType(ReadGraph graph, Variable variable) throws DatabaseException {
 919                 Datatype dt = getDatatype(graph, variable);
 920                 return dt.toSingleLineString();
 921         }
 922
 923         private static boolean isAsserted(ReadGraph graph, Resource subject, Resource predicate) throws DatabaseException {
 924                 Statement stm = graph.getPossibleStatement(subject, predicate);
 925                 return stm != null && stm.isAsserted(subject);
 926         }
 927
 928         public static void setExpression(WriteGraph graph, Variable context, String text, Resource expressionValueType) throws DatabaseException {
 929
 930                 Resource value = context.getRepresents(graph);
 931                 Resource predicateResource = context.getPredicateResource(graph);
 932                 Variable parent = context.getParent(graph);
 933                 Resource parentResource = parent.getRepresents(graph);
 934                 setExpression(graph, parentResource, predicateResource, value, text, expressionValueType);
 935
 936         }
 937
 938         public static void setExpression(WriteGraph graph, Resource parentResource, Resource predicateResource, Resource value, String text, Resource expressionValueType) throws DatabaseException {
 939
 940                 Layer0 L0 = Layer0.getInstance(graph);
 941                 boolean hasExpression = graph.isInstanceOf(value, expressionValueType);
 942                 String t = getSCLTypeString(graph, predicateResource, value);
 943                 String expression = text.substring(1).trim();
 944                 if(isAsserted(graph, parentResource, predicateResource)) {
 945                         Resource newValue = graph.newResource();
 946                         graph.claim(newValue, L0.InstanceOf, expressionValueType);
 947                         graph.claimLiteral(newValue, L0.HasValueType, t, Bindings.STRING);
 948                         graph.claimLiteral(newValue, L0.SCLValue_expression, expression, Bindings.STRING);
 949                         graph.claim(parentResource, predicateResource, newValue);
 950                 } else {
 951                         if(hasExpression) {
 952                                 graph.claimLiteral(value, L0.SCLValue_expression, expression, Bindings.STRING);
 953                         } else {
 954                                 Resource newValue = graph.newResource();
 955                                 graph.claim(newValue, L0.InstanceOf, expressionValueType);
 956                                 graph.claimLiteral(newValue, L0.HasValueType, t, Bindings.STRING);
 957                                 graph.claimLiteral(newValue, L0.SCLValue_expression, expression, Bindings.STRING);
 958                                 graph.deny(parentResource, predicateResource);
 959                                 graph.claim(parentResource, predicateResource, newValue);
 960                         }
 961                 }
 962
 963         }
 964
 965         public static void clearExpression(WriteGraph graph, Variable property, Resource expressionValueType) throws DatabaseException {
 966
 967                 Resource object = property.getPossibleRepresents(graph);
 968                 if(object != null) {
 969                         boolean hasExpression = graph.isInstanceOf(object, expressionValueType);
 970                         if(hasExpression) {
 971                                 // There was an expression and now we go back to a value
 972                                 Resource subject = property.getParent(graph).getPossibleRepresents(graph);
 973                                 if(subject != null) {
 974                                         Resource predicate = property.getPossiblePredicateResource(graph);
 975                                         if(predicate != null) {
 976                                                 graph.deny(subject, predicate, object);
 977                                                 RemoverUtil.remove(graph, object);
 978                                         }
 979                                 }
 980                         }
 981                 }
 982
 983         }
 984
 985         public static boolean setOrClearExpression(WriteGraph graph, Variable property, String text, Resource expressionValueType) throws DatabaseException {
 986
 987                 if(text.startsWith("=")) {
 988                         setExpression(graph, property, text, expressionValueType);
 989                         return true;
 990                 }
 991
 992                 clearExpression(graph, property, expressionValueType);
 993
 994                 return false;
 995
 996         }
 997
 998         public static void setValueAsString(WriteGraph graph, Variable property, String text, Resource expressionValueType) throws DatabaseException {
 999
1000                 try {
1001
1002                         if (setOrClearExpression(graph, property, text, expressionValueType))
1003                                 return;
1004
1005                         Object value = text;
1006                         Datatype type = property.getPossibleDatatype(graph);
1007                         if (type != null) {
1008
1009                                 Binding binding = Bindings.getBinding(type);
1010
1011                                 if (binding instanceof StringBinding) {
1012
1013                                         if (binding instanceof MutableStringBinding)
1014                                                 value = new MutableString(text);
1015                                         else
1016                                                 value = text;
1017
1018                                 } else {
1019
1020                                         if (binding instanceof NumberBinding) {
1021                                                 text = text.replace(",", ".");
1022                                         }
1023
1024                                         value = binding.parseValue(text, new DataValueRepository());
1025
1026                                 }
1027
1028                                 property.setValue(graph, value, binding);
1029
1030                         } else {
1031
1032                                 property.setValue(graph, value);
1033
1034                         }
1035
1036                         // Add a comment to metadata.
1037                         CommentMetadata cm = graph.getMetadata(CommentMetadata.class);
1038                         graph.addMetadata(cm.add("Set value " + ObjectUtils.toString(value)));
1039
1040                 } catch (DataTypeSyntaxError e) {
1041                         throw new DatabaseException(e);
1042                 } catch (BindingException e) {
1043                         throw new DatabaseException(e);
1044                 }
1045
1046         }
1047
1048
1049     public static String queryDebugSupport(String query) {
1050         Session session = SimanticsInternal.getSession();
1051         DebugSupport ds = session.getService(DebugSupport.class);
1052         return ds.query(session, "exec " + query);
1053     }
1054
1055     public static String queryListSupport (String query) {
1056         Session session = SimanticsInternal.getSession();
1057         DebugSupport ds = session.getService(DebugSupport.class);
1058         return ds.query(session, "list " + query);
1059     }
1060
1061     final public static Function1<Resource,Resource> resourceCluster = new FunctionImpl1<Resource, Resource>() {
1062                 @Override
1063                 public Resource apply(Resource p0) {
1064                         return p0;
1065                 }
1066         };
1067
1068         public static void sort(ReadGraph graph, List<Resource> collection) {
1069         CollectionSupport cos = graph.getService(CollectionSupport.class);
1070         cos.sort(collection);
1071         }
1072
1073         public static List<Resource> sortByCluster(ReadGraph graph, Collection<Resource> collection) {
1074         CollectionSupport cos = graph.getService(CollectionSupport.class);
1075         return cos.asSortedList(collection);
1076         }
1077
1078         public static List<Object> sortByCluster(final ReadGraph graph, List<Object> list, final Function1<Object,Resource> fn) {
1079         final ClusteringSupport cs = graph.getService(ClusteringSupport.class);
1080         ArrayList<Object> result = new ArrayList<Object>(list);
1081         Collections.sort(result, new Comparator<Object>() {
1082
1083                         @Override
1084                         public int compare(Object o1, Object o2) {
1085                                 Resource r1 = fn.apply(o1);
1086                                 Resource r2 = fn.apply(o2);
1087                                 long l1 = cs.getCluster(r1);
1088                                 long l2 = cs.getCluster(r2);
1089                                 if(l1 < l2) return -1;
1090                                 else if (l1 > l2) return 1;
1091                                 else return 0;
1092                         }
1093
1094         });
1095         return result;
1096     }
1097
1098     public static <T> List<T> sortByClusterT(final ReadGraph graph, Collection<T> list, final Function1<T,Resource> fn) {
1099         final ClusteringSupport cs = graph.getService(ClusteringSupport.class);
1100         ArrayList<T> result = new ArrayList<T>(list);
1101         Collections.sort(result, new Comparator<Object>() {
1102
1103             @Override
1104             public int compare(Object o1, Object o2) {
1105                 Resource r1 = fn.apply((T)o1);
1106                 Resource r2 = fn.apply((T)o2);
1107                 long l1 = cs.getCluster(r1);
1108                 long l2 = cs.getCluster(r2);
1109                 if(l1 < l2) return -1;
1110                 else if (l1 > l2) return 1;
1111                 else return 0;
1112             }
1113
1114         });
1115         return result;
1116     }
1117
1118     public static void makeSynchronous(ReadGraph graph, boolean value) throws DatabaseException {
1119         graph.setSynchronous(value);
1120     }
1121
1122     public static Set<Resource> listIndexRoots(ReadGraph graph) throws DatabaseException {
1123
1124         Layer0 L0 = Layer0.getInstance(graph);
1125
1126                 Set<Resource> indexRoots = new TreeSet<Resource>();
1127                 indexRoots.addAll(Layer0Utils.listOntologies(graph));
1128                 indexRoots.addAll(graph.syncRequest(new ObjectsWithType(SimanticsInternal.getProject(), L0.ConsistsOf, L0.IndexRoot)));
1129                 return indexRoots;
1130
1131     }
1132
1133     public static List<Resource> listOntologies(ReadGraph graph) throws DatabaseException {
1134         return graph.syncRequest(new OntologiesFromLibrary(graph.getRootLibrary()));
1135     }
1136
1137     public static List<Resource> listGlobalOntologies(ReadGraph graph) throws DatabaseException {
1138         return graph.syncRequest(new GlobalOntologies(graph.getRootLibrary()));
1139     }
1140
1141     public static <T> T applySCL(String module, String function, ReadGraph graph, Object ... args) throws DatabaseException {
1142
1143                 try {
1144                         SCL_GRAPH.set(graph);
1145                         T t = (T)((Function)SCLOsgi.MODULE_REPOSITORY.getValue(module + "/" + function)).applyArray(args);
1146                         SCL_GRAPH.set(null);
1147                         return t;
1148                 } catch (Throwable t) {
1149                         throw new DatabaseException(t);
1150                 }
1151
1152     }
1153
1154     public static boolean isContainerPublished(ReadGraph graph, Variable variable) throws DatabaseException {
1155
1156         Resource indexRoot = graph.syncRequest(new PossibleVariableIndexRoot(variable));
1157         if(indexRoot == null) return false;
1158         if(variable.equals(indexRoot)) return false;
1159         return isPublished(graph, indexRoot);
1160
1161     }
1162
1163     public static boolean isContainerPublished(ReadGraph graph, Resource resource) throws DatabaseException {
1164
1165         Resource indexRoot = graph.syncRequest(new PossibleIndexRoot(resource));
1166         if(indexRoot == null) return false;
1167         if(resource.equals(indexRoot)) return false;
1168         return isPublished(graph, indexRoot);
1169
1170     }
1171
1172     public static boolean isPublished(ReadGraph graph, Resource resource) throws DatabaseException {
1173
1174         Layer0 L0 = Layer0.getInstance(graph);
1175         Boolean value = graph.getPossibleRelatedValue(resource, L0.Entity_published, Bindings.BOOLEAN);
1176         if(value != null && value) return true;
1177
1178         // This is safety - root should not be published it child is not
1179         Resource root = graph.syncRequest(new PossibleIndexRoot(resource));
1180         if(root != null) {
1181                 value = graph.getPossibleRelatedValue(root, L0.Entity_published, Bindings.BOOLEAN);
1182                 if(value != null && value) return true;
1183         }
1184
1185         return false;
1186
1187     }
1188
1189     private static TransferableGraph1 makeTG(ReadGraph graph, Resource r) throws DatabaseException {
1190
1191         SimanticsClipboardImpl cp = new SimanticsClipboardImpl();
1192         CopyHandler c1 = graph.adapt(r, CopyHandler.class);
1193         c1.copyToClipboard(graph, cp);
1194         Collection<Set<Representation>> reps = cp.getContents();
1195         if(reps.size() != 1) return null;
1196         return ClipboardUtils.accept(graph, reps.iterator().next(), SimanticsKeys.KEY_TRANSFERABLE_GRAPH);
1197
1198     }
1199
1200     public static TransferableGraphSource makeTGSource(ReadGraph graph, Resource r) throws DatabaseException {
1201
1202         SimanticsClipboardImpl cp = new SimanticsClipboardImpl();
1203         CopyHandler c1 = graph.adapt(r, CopyHandler.class);
1204         c1.copyToClipboard(graph, cp);
1205         Collection<Set<Representation>> reps = cp.getContents();
1206         if(reps.size() != 1) return null;
1207         return ClipboardUtils.accept(graph, reps.iterator().next(), SimanticsKeys.KEY_TRANSFERABLE_GRAPH_SOURCE);
1208
1209     }
1210
1211     /*
1212      * Modifies target to resemble source.
1213      */
1214     public static boolean merge(WriteGraph graph, Resource source, Resource target) throws DatabaseException {
1215
1216         TransferableGraphSource tgs1 = makeTGSource(graph, target);
1217         TransferableGraph1 tg1 = TransferableGraphs.create(graph, tgs1);
1218         TransferableGraph1 tg2 = makeTG(graph, source);
1219
1220         GraphRefactoringUtils.fixIncorrectRoot(tg1.identities);
1221         GraphRefactoringUtils.fixIncorrectRoot(tg2.identities);
1222
1223         ModelTransferableGraphSource mtgs = (ModelTransferableGraphSource)tgs1;
1224
1225                 Diff diff = new Diff(tg1, tg2);
1226                 TransferableGraphDelta1 delta = diff.diff();
1227
1228                 long[] oldResources = mtgs.getResourceArray(graph);
1229                 if(TransferableGraphs.hasChanges(graph, oldResources, delta)) {
1230                         TransferableGraphs.applyDelta(graph, mtgs.getResourceArray(graph), delta);
1231                         return true;
1232                 } else {
1233                         return false;
1234                 }
1235
1236     }
1237
1238     public static Resource inferLiteralTypeFromString(ReadGraph graph, String text) {
1239         return Layer0.getInstance(graph).String;
1240     }
1241
1242     public static void emptyTrashBin() throws ServiceException {
1243         emptyTrashBin(new NullProgressMonitor());
1244     }
1245
1246     public static void emptyTrashBin(IProgressMonitor monitor) throws ServiceException {
1247         emptyTrashBin(monitor, SimanticsInternal.getSession(), SimanticsInternal.getProject());
1248     }
1249
1250     public static void emptyTrashBin(final IProgressMonitor monitor, Session session, final Resource project) throws ServiceException {
1251         final SubMonitor mon = SubMonitor.convert(monitor, "Emptying Trash Bin...", 10000);
1252         try {
1253             session.syncRequest(new DelayedWriteRequest() {
1254                 @Override
1255                 public void perform(WriteGraph graph) throws DatabaseException {
1256                     Layer0Utils.setDependenciesIndexingDisabled(graph, true);
1257                     Layer0 L0 = Layer0.getInstance(graph);
1258                     Layer0X L0X = Layer0X.getInstance(graph);
1259                     Resource parent = graph.getSingleObject(project, L0.PartOf);
1260                     Resource trashBin = Layer0Utils.getPossibleChild(graph, parent, "TrashBin");
1261                     Collection<Resource> trashes = trashBin != null
1262                             ? graph.getObjects(trashBin, L0.ConsistsOf)
1263                             : Collections.<Resource>emptyList();
1264                     if (trashes.isEmpty())
1265                         throw new CancelTransactionException();
1266                     mon.setWorkRemaining((2 + trashes.size()) * 1000);
1267                     for(Resource trash : trashes) {
1268                         if (mon.isCanceled())
1269                             throw new CancelTransactionException();
1270                         mon.subTask(NameUtils.getSafeName(graph, trash));
1271                         TGRemover remo = new TGRemover(mon.newChild(1000, SubMonitor.SUPPRESS_ALL_LABELS), trash);
1272                         remo.remove(graph);
1273                         if(graph.isInstanceOf(trash, L0.IndexRoot)) {
1274                                 // TODO: this should be an utility
1275                                         GenericRelationIndex index = graph.adapt(L0X.DependenciesRelation, GenericRelationIndex.class);
1276                                         IndexedRelations ir = graph.getService(IndexedRelations.class);
1277                                         // Deletes index files
1278                                         ir.reset(null, graph, L0X.DependenciesRelation, trash);
1279                                         // Notifies DB listeners
1280                                         index.reset(graph, trash);
1281                         }
1282                     }
1283                     if (mon.isCanceled())
1284                         throw new CancelTransactionException();
1285                     mon.subTask("Committing Changes");
1286                     mon.newChild(1000);
1287                 }
1288             });
1289             if (mon.isCanceled())
1290                 return;
1291             mon.subTask("Purging Database");
1292             mon.newChild(1000);
1293             purgeDatabase(monitor, session);
1294         } catch (CancelTransactionException e) {
1295             // Ignore.
1296         } catch (DatabaseException e) {
1297             throw new ServiceException(e);
1298         }
1299     }
1300
1301     public static void purgeDatabase() throws ServiceException {
1302         purgeDatabase(new NullProgressMonitor());
1303     }
1304
1305     public static void purgeDatabase(final IProgressMonitor monitor) throws ServiceException {
1306         purgeDatabase(monitor, SimanticsInternal.getSession());
1307     }
1308
1309     public static void purgeDatabase(final IProgressMonitor monitor, Session session) throws ServiceException {
1310         try {
1311                 XSupport xs = session.getService(XSupport.class);
1312                 xs.purge();
1313         } catch (DatabaseException e) {
1314                 throw new ServiceException(e);
1315         }
1316     }
1317
1318     public static Resource getSingleDomainOf(ReadGraph graph, Resource type, Resource target) throws DatabaseException {
1319         Resource result = null;
1320         for(Resource candidate : getDomainOf(graph, type).values()) {
1321                 if(graph.isInstanceOf(candidate, target)) {
1322                         if(result != null) throw new DatabaseException("Multiple relations found for target " + graph.getURI(target) + " in type " + graph.getURI(type));
1323                         else result = candidate;
1324                 }
1325         }
1326         if(result == null) throw new DatabaseException("Multiple relations found for target " + graph.getURI(target) + " in type " + graph.getURI(type));
1327         return result;
1328     }
1329
1330     public static Map<String, Resource> getDomainOf(ReadGraph graph, Resource type) throws DatabaseException {
1331         CollectionSupport cs = graph.getService(CollectionSupport.class);
1332         Map<String, Resource> result = cs.createObjectResourceMap(String.class);
1333         Layer0 L0 = Layer0.getInstance(graph);
1334         for(Resource r : graph.getObjects(type, L0.DomainOf)) {
1335                 String name = graph.getPossibleRelatedValue(r, L0.HasName, Bindings.STRING);
1336                 if(name != null) result.put(name, r);
1337         }
1338         for(Resource t : graph.getSupertypes(type)) {
1339                 for(Resource r : graph.getObjects(t, L0.DomainOf)) {
1340                         String name = graph.getPossibleRelatedValue(r, L0.HasName, Bindings.STRING);
1341                         if(name != null) result.put(name, r);
1342                 }
1343         }
1344         return result;
1345     }
1346
1347     public static Resource getPossiblePredicateByNameFromType(ReadGraph graph, Resource type, String name) throws DatabaseException {
1348         Map<String,Resource> domain = getDomainOf(graph, type);
1349         return domain.get(name);
1350     }
1351
1352     public static Resource getPossiblePredicateByName(ReadGraph graph, Resource instance, String predicateName) throws DatabaseException {
1353         for(Resource type : graph.getPrincipalTypes(instance)) {
1354                 Map<String, Resource> domainOf = getDomainOf(graph, type);
1355                 Resource predicate = domainOf.get(predicateName);
1356                 if(predicate != null) return predicate;
1357         }
1358         return null;
1359     }
1360
1361     public static Resource getPossiblePredicateByLabel(ReadGraph graph, Resource instance, String predicateName) throws DatabaseException {
1362         Layer0 L0 = Layer0.getInstance(graph);
1363         for(Resource type : graph.getPrincipalTypes(instance)) {
1364                 Map<String, Resource> domainOf = getDomainOf(graph, type);
1365                 for(Resource r : domainOf.values()) {
1366                         String label = graph.getPossibleRelatedValue(r, L0.HasLabel, Bindings.STRING);
1367                         if(predicateName.equals(label))
1368                                 return r;
1369                 }
1370         }
1371         return null;
1372     }
1373
1374     public static void claimLiteralDataboard(WriteGraph graph, Resource container, Resource property, String valueText) throws DatabaseException {
1375
1376         try {
1377                 PropertyInfo pi = graph.syncRequest(new PropertyInfoRequest(property));
1378                 if(pi.literalRange == null) throw new DatabaseException("No suitable literal type defined as range for property.");
1379                 if(pi.defaultBinding == null) throw new DatabaseException("No suitable default binding for property.");
1380                         Object value = pi.defaultBinding.parseValue(valueText, new DataValueRepository());
1381                         graph.claimLiteral(container, property, pi.literalRange, value, pi.defaultBinding);
1382                 } catch (DataTypeSyntaxError e) {
1383                         throw new DatabaseException(e);
1384                 } catch (BindingException e) {
1385                         throw new DatabaseException(e);
1386                 }
1387
1388     }
1389
1390     public static String prettyPrintResource(ReadGraph graph, Resource resource, boolean ignoreIdentifiers) throws Exception {
1391         TransferableGraphSource source = makeTGSource(graph, resource);
1392         TransferableGraph1 tg = TransferableGraphs.create(graph, source);
1393         GraphRefactoringUtils.fixOntologyExport(tg);
1394         System.out.println("Printing resoure " + graph.getURI(resource));
1395         return PrettyPrintTG.print(tg, ignoreIdentifiers);
1396     }
1397
1398     /**
1399      * Adds a random {@link GUID} as a value for <code>L0.identifier</code>
1400      *
1401      * @param graph
1402      * @param component
1403      *            for which the identifier is added
1404      * @param add
1405      *            <code>true</code> to invoke addLiteral, <code>false</code> to
1406      *            invoke claimLiteral
1407      * @throws DatabaseException
1408      */
1409     public static void claimNewIdentifier(WriteGraph graph, Resource component, boolean add) throws DatabaseException {
1410         Layer0 L0 = Layer0.getInstance(graph);
1411         GUID guid = GUID.random();
1412         if (add)
1413             graph.addLiteral(component, L0.identifier, L0.identifier_Inverse, L0.GUID, guid, GUID.BINDING);
1414         else
1415             graph.claimLiteral(component, L0.identifier, L0.identifier_Inverse, L0.GUID, guid, GUID.BINDING);
1416     }
1417
1418     /**
1419      * Sets a new random unique identifier for the specified entity if it already
1420      * has an identifier. If the entity does not have a previous identifier, nothing
1421      * is done.
1422      *
1423      * @param graph
1424      * @param entity
1425      *            for which the identifier is added
1426      * @return <code>true</code> if the identifier was renewed, <code>false</code>
1427      *         otherwise
1428      * @throws DatabaseException
1429      * @see {@link #claimNewIdentifier(WriteGraph, Resource, boolean)}
1430      */
1431     public static boolean renewIdentifier(WriteGraph graph, Resource entity) throws DatabaseException {
1432         Layer0 L0 = Layer0.getInstance(graph);
1433         Statement stm = graph.getPossibleStatement(entity, L0.identifier);
1434         if (stm != null) {
1435             graph.claimValue(stm.getObject(), GUID.random(), GUID.BINDING);
1436             return true;
1437         }
1438         return false;
1439     }
1440
1441     public static void addMetadataListener(ChangeListener listener) {
1442         SimanticsInternal.getSession().getService(GraphChangeListenerSupport.class).addMetadataListener(listener);
1443     }
1444
1445     public static void removeMetadataListener(ChangeListener listener) {
1446         SimanticsInternal.getSession().getService(GraphChangeListenerSupport.class).removeMetadataListener(listener);
1447     }
1448
1449 }