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.PossibleIndexRoot;
  75 import org.simantics.db.common.request.WriteRequest;
  76 import org.simantics.db.common.utils.CommonDBUtils;
  77 import org.simantics.db.common.utils.NameUtils;
  78 import org.simantics.db.event.ChangeListener;
  79 import org.simantics.db.exception.CancelTransactionException;
  80 import org.simantics.db.exception.DatabaseException;
  81 import org.simantics.db.exception.ServiceException;
  82 import org.simantics.db.layer0.adapter.CopyHandler;
  83 import org.simantics.db.layer0.adapter.CopyHandler2;
  84 import org.simantics.db.layer0.adapter.GenericRelationIndex;
  85 import org.simantics.db.layer0.adapter.PasteHandler;
  86 import org.simantics.db.layer0.adapter.impl.DefaultPasteHandler;
  87 import org.simantics.db.layer0.adapter.impl.EntityRemover;
  88 import org.simantics.db.layer0.adapter.impl.TGRemover;
  89 import org.simantics.db.layer0.genericrelation.IndexedRelations;
  90 import org.simantics.db.layer0.internal.SimanticsInternal;
  91 import org.simantics.db.layer0.migration.OntologiesFromLibrary;
  92 import org.simantics.db.layer0.property.OrderedResource;
  93 import org.simantics.db.layer0.request.GlobalOntologies;
  94 import org.simantics.db.layer0.request.PossibleVariableIndexRoot;
  95 import org.simantics.db.layer0.request.PropertyInfo;
  96 import org.simantics.db.layer0.request.PropertyInfoRequest;
  97 import org.simantics.db.layer0.util.SimanticsClipboard.Representation;
  98 import org.simantics.db.layer0.variable.StandardGraphPropertyVariable;
  99 import org.simantics.db.layer0.variable.Variable;
 100 import org.simantics.db.service.ClusterCollectorPolicy;
 101 import org.simantics.db.service.ClusterControl;
 102 import org.simantics.db.service.ClusteringSupport;
 103 import org.simantics.db.service.CollectionSupport;
 104 import org.simantics.db.service.DebugSupport;
 105 import org.simantics.db.service.GraphChangeListenerSupport;
 106 import org.simantics.db.service.ManagementSupport;
 107 import org.simantics.db.service.UndoRedoSupport;
 108 import org.simantics.db.service.XSupport;
 109 import org.simantics.graph.db.TransferableGraphSource;
 110 import org.simantics.graph.db.TransferableGraphs;
 111 import org.simantics.graph.diff.Diff;
 112 import org.simantics.graph.diff.TransferableGraphDelta1;
 113 import org.simantics.graph.refactoring.GraphRefactoringUtils;
 114 import org.simantics.graph.representation.PrettyPrintTG;
 115 import org.simantics.graph.representation.TransferableGraph1;
 116 import org.simantics.layer0.Layer0;
 117 import org.simantics.operation.Layer0X;
 118 import org.simantics.scl.compiler.runtime.RuntimeEnvironment;
 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         public static Resource literal(WriteGraph g, String value) throws DatabaseException {
 131                 Layer0 L0 = Layer0.getInstance(g);
 132                 Resource r = g.newResource();
 133                 g.claimValue(r, value, Bindings.STRING);
 134                 g.claim(r, L0.InstanceOf, L0.String);
 135                 return r;
 136         }
 137
 138         public static Resource literal(WriteGraph g, double value) throws DatabaseException {
 139                 Layer0 L0 = Layer0.getInstance(g);
 140                 Resource r = g.newResource();
 141                 g.claimValue(r, value, Bindings.DOUBLE);
 142                 g.claim(r, L0.InstanceOf, L0.Double);
 143                 return r;
 144         }
 145
 146         public static Resource literal(WriteGraph g, int value) throws DatabaseException {
 147                 Layer0 L0 = Layer0.getInstance(g);
 148                 Resource r = g.newResource();
 149                 g.claimValue(r, value, Bindings.INTEGER);
 150                 g.claim(r, L0.InstanceOf, L0.Integer);
 151                 return r;
 152         }
 153
 154         public static void assert_(WriteGraph g, Resource type, Resource predicate, Resource object) throws DatabaseException {
 155                 Layer0 L0 = Layer0.getInstance(g);
 156                 Resource assertion = g.newResource();
 157                 g.claim(type, L0.Asserts, assertion);
 158                 g.claim(assertion, L0.InstanceOf, L0.Assertion);
 159                 g.claim(assertion, L0.HasPredicate, predicate);
 160                 g.claim(assertion, L0.HasObject, object);
 161         }
 162
 163         public static Resource relation(WriteGraph g, Resource parent, String name, Resource superrelation) throws DatabaseException {
 164                 Layer0 L0 = Layer0.getInstance(g);
 165                 Resource relation = g.newResource();
 166                 g.claim(relation, L0.SubrelationOf, superrelation);
 167                 g.claim(relation, L0.HasName, literal(g, name));
 168                 g.claim(parent, L0.ConsistsOf, relation);
 169
 170                 Resource superrelationInverse = g.getInverse(superrelation);
 171                 if(superrelationInverse != null) {
 172                         Resource inverse = g.newResource();
 173                         g.claim(inverse, L0.SubrelationOf, superrelationInverse);
 174                         g.claim(relation, L0.ConsistsOf, inverse);
 175                         g.claim(inverse, L0.HasName, literal(g, "Inverse"));
 176                 }
 177                 return relation;
 178         }
 179
 180         private static Resource getLiteralType(ReadGraph graph, Datatype type) throws DatabaseException {
 181                 Layer0 L0 = Layer0.getInstance(graph);
 182                 if(type instanceof DoubleType) return L0.Double;
 183                 else if(type instanceof StringType) return L0.String;
 184                 else if(type instanceof IntegerType) return L0.Integer;
 185                 else if(type instanceof LongType) return L0.Long;
 186                 else if(type instanceof FloatType) return L0.Float;
 187                 else if(type instanceof ByteType) return L0.Byte;
 188                 else if(type instanceof BooleanType) return L0.Boolean;
 189                 else if(type instanceof ArrayType) {
 190                         ArrayType at = (ArrayType)type;
 191                         if(at.componentType instanceof DoubleType) return L0.DoubleArray;
 192                         else if(at.componentType instanceof StringType) return L0.StringArray;
 193                         else if(at.componentType instanceof IntegerType) return L0.IntegerArray;
 194                         else if(at.componentType instanceof LongType) return L0.LongArray;
 195                         else if(at.componentType instanceof FloatType) return L0.FloatArray;
 196                         else if(at.componentType instanceof ByteType) return L0.ByteArray;
 197                         else if(at.componentType instanceof BooleanType) return L0.BooleanArray;
 198                         else if(at.componentType instanceof VariantType) return L0.VariantArray;
 199                 }
 200                 throw new DatabaseException("Unidentified literal type for datatype " + type);
 201         }
 202
 203         private static Resource getPossibleLiteralType(ReadGraph graph, String type) throws DatabaseException {
 204
 205                 Layer0 L0 = Layer0.getInstance(graph);
 206                 if("Double".equals(type)) return L0.Double;
 207                 else if("String".equals(type)) return L0.String;
 208                 else if("Integer".equals(type)) return L0.Integer;
 209                 else if("Long".equals(type)) return L0.Long;
 210                 else if("Float".equals(type)) return L0.Float;
 211                 else if("Byte".equals(type)) return L0.Byte;
 212                 else if("Boolean".equals(type)) return L0.Boolean;
 213                 else if("[Double]".equals(type)) return L0.DoubleArray;
 214                 else if("[String]".equals(type)) return L0.StringArray;
 215                 else if("[Integer]".equals(type)) return L0.IntegerArray;
 216                 else if("[Long]".equals(type)) return L0.LongArray;
 217                 else if("[Float]".equals(type)) return L0.FloatArray;
 218                 else if("[Byte]".equals(type)) return L0.ByteArray;
 219                 else if("[Boolean]".equals(type)) return L0.BooleanArray;
 220                 else if("[Variant]".equals(type)) return L0.VariantArray;
 221                 else if("Array Double".equals(type)) return L0.DoubleArray;
 222                 else if("Array String".equals(type)) return L0.StringArray;
 223                 else if("Array Integer".equals(type)) return L0.IntegerArray;
 224                 else if("Array Long".equals(type)) return L0.LongArray;
 225                 else if("Array Float".equals(type)) return L0.FloatArray;
 226                 else if("Array Byte".equals(type)) return L0.ByteArray;
 227                 else if("Array Boolean".equals(type)) return L0.BooleanArray;
 228                 else if("Array Variant".equals(type)) return L0.VariantArray;
 229                 else if("Vector Double".equals(type)) return L0.DoubleArray;
 230                 else if("Vector String".equals(type)) return L0.StringArray;
 231                 else if("Vector Integer".equals(type)) return L0.IntegerArray;
 232                 else if("Vector Long".equals(type)) return L0.LongArray;
 233                 else if("Vector Float".equals(type)) return L0.FloatArray;
 234                 else if("Vector Byte".equals(type)) return L0.ByteArray;
 235                 else if("Vector Boolean".equals(type)) return L0.BooleanArray;
 236                 else if("Vector Variant".equals(type)) return L0.VariantArray;
 237                 else if("Datatype".equals(type)) return L0.DataType;
 238                 else if("Variant".equals(type)) return L0.Variant;
 239                 else return null;
 240         }
 241
 242         public static Resource getPossibleLiteralType(ReadGraph graph, Variable variable) throws DatabaseException {
 243                 Resource predicate = variable.getPossiblePredicateResource(graph);
 244                 if(predicate == null) return null;
 245                 return getPossibleLiteralType(graph, predicate);
 246         }
 247
 248         public static Resource getLiteralType(ReadGraph graph, Variable variable) throws DatabaseException {
 249                 Resource result = getPossibleLiteralType(graph, variable);
 250                 if(result == null) throw new DatabaseException("Unidentified literal type for variable " + variable.getURI(graph));
 251                 return result;
 252         }
 253
 254         public static Resource getLiteralType(ReadGraph graph, Resource property) throws DatabaseException {
 255                 Resource result = getPossibleLiteralType(graph, property);
 256                 if(result == null) throw new DatabaseException("Unidentified literal type for property " + graph.getURI(property));
 257                 return result;
 258         }
 259
 260         public static Resource getPossibleLiteralType(ReadGraph graph, Resource property) throws DatabaseException {
 261
 262                 Layer0 L0 = Layer0.getInstance(graph);
 263                 Layer0X L0X = Layer0X.getInstance(graph);
 264
 265                 Resource defaultLiteralType = graph.getPossibleObject(property, L0.HasDefaultLiteralType);
 266                 if(defaultLiteralType != null) return defaultLiteralType;
 267
 268                 Resource range = graph.getPossibleObject(property, L0.HasRange);
 269                 if(range != null && !L0.Value.equals(range)) return range;
 270
 271                 Datatype requiredDataType = graph.getPossibleRelatedValue(property, L0X.RequiresDataType, Bindings.DATATYPE);
 272                 if(requiredDataType != null) return getLiteralType(graph, requiredDataType);
 273
 274                 String requiredValueType = graph.getPossibleRelatedValue(property, L0.RequiresValueType, Bindings.STRING);
 275                 if(requiredValueType == null) return null;
 276
 277                 return getPossibleLiteralType(graph, requiredValueType);
 278
 279         }
 280
 281         /**
 282          * @param type any data type definition
 283          * @return SCL type that matches the specified data type on a basic level.
 284          *         Data type metadata is/cannot be converted into SCL types.
 285          * @throws IllegalArgumentException
 286          *             if the input datatype can't be converted into an SCL type
 287          */
 288         public static String getSCLType(Datatype type) throws IllegalArgumentException {
 289                 return buildSCLType(type, null).toString();
 290         }
 291
 292         /**
 293          * Only used internally by {@link #buildSCLType(Datatype, StringBuilder)}
 294          * @param s
 295          * @param toBuilder
 296          * @return
 297          * @see #buildSCLType(Datatype, StringBuilder)
 298          */
 299         private static StringBuilder append(StringBuilder toBuilder, String s) {
 300                 return toBuilder != null ? toBuilder.append(s) : new StringBuilder(s);
 301         }
 302
 303         private static CharSequence append(CharSequence to, String s) {
 304                 if (to instanceof StringBuilder)
 305                         return ((StringBuilder) to).append(s);
 306                 return new StringBuilder(to.length() + s.length()).append(to).append(s);
 307         }
 308
 309         private static CharSequence stringOrBuilder(StringBuilder toBuilder, String s) {
 310                 return toBuilder != null ? toBuilder.append(s) : s;
 311         }
 312
 313         /**
 314          * @param type any data type definition
 315          * @return SCL type that matches the specified data type on a basic level.
 316          *         Data type metadata is/cannot be converted into SCL types.
 317          * @throws IllegalArgumentException
 318          *             if the input datatype can't be converted into an SCL type
 319          */
 320         private static CharSequence buildSCLType(Datatype type, StringBuilder result) throws IllegalArgumentException {
 321                 if(type instanceof DoubleType) return stringOrBuilder(result, "Double");
 322                 else if(type instanceof StringType) return stringOrBuilder(result, "String");
 323                 else if(type instanceof IntegerType) return stringOrBuilder(result, "Integer");
 324                 else if(type instanceof FloatType) return stringOrBuilder(result, "Float");
 325                 else if(type instanceof BooleanType) return stringOrBuilder(result, "Boolean");
 326                 else if(type instanceof ByteType) return stringOrBuilder(result, "Byte");
 327                 else if(type instanceof LongType) return stringOrBuilder(result, "Long");
 328                 else if(type instanceof VariantType) return stringOrBuilder(result, "Variant");
 329                 else if(type instanceof ArrayType) {
 330                         ArrayType at = (ArrayType) type;
 331                         // Optimization to prevent allocations in the most basic array cases
 332                         if(at.componentType instanceof DoubleType) return stringOrBuilder(result, "Vector Double");
 333                         else if(at.componentType instanceof StringType) return stringOrBuilder(result, "Vector String");
 334                         else if(at.componentType instanceof IntegerType) return stringOrBuilder(result, "Vector Integer");
 335                         else if(at.componentType instanceof FloatType) return stringOrBuilder(result, "Vector Float");
 336                         else if(at.componentType instanceof BooleanType) return stringOrBuilder(result, "Vector Boolean");
 337                         else if(at.componentType instanceof ByteType) return stringOrBuilder(result, "Vector Byte");
 338                         else if(at.componentType instanceof LongType) return stringOrBuilder(result, "Vector Long");
 339                         else if(at.componentType instanceof VariantType) return stringOrBuilder(result, "Vector Variant");
 340                         else return buildSCLType(at.componentType, append(result, "Vector "));
 341                 } else if(type instanceof OptionalType) {
 342                         OptionalType ot = (OptionalType) type;
 343                         return append(buildSCLType(ot.componentType, append(result, "Maybe (")), ")");
 344                 } else if (type instanceof RecordType) {
 345                         throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 346                 } else if (type instanceof MapType) {
 347                         throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 348                 } else if (type instanceof UnionType) {
 349                         throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 350                 }
 351                 throw new IllegalArgumentException("Unable to convert datatype into SCL type: " + type);
 352         }
 353
 354         @Deprecated
 355         public static Type getSCLType(ReadGraph graph, RuntimeEnvironment runtimeEnvironment, String typeText) throws DatabaseException {
 356             return CommonDBUtils.getSCLType(graph, runtimeEnvironment, typeText);
 357         }
 358
 359         public static Type getSCLType(ReadGraph graph, Variable property) throws DatabaseException {
 360
 361                 RuntimeEnvironment runtimeEnvironment = graph.syncRequest(new RuntimeEnvironmentRequest(property.getIndexRoot(graph)));
 362                 return getSCLType(graph, runtimeEnvironment, getSCLTypeString(graph, property));
 363
 364         }
 365
 366
 367         public static String getSCLTypeString(ReadGraph graph, Variable context) throws DatabaseException {
 368                 return getSCLTypeString(graph, context.getPossiblePredicateResource(graph), context.getRepresents(graph));
 369         }
 370
 371
 372         public static String getSCLTypeString(ReadGraph graph, Resource predicate, Resource value) throws DatabaseException {
 373
 374                 if(predicate != null) {
 375                     String requiredValueTypes = graph.getPossibleRelatedValue(predicate, Layer0.getInstance(graph).RequiresValueType, Bindings.STRING);
 376                     if(requiredValueTypes != null)
 377                         return requiredValueTypes;
 378                 }
 379
 380                 Layer0 L0 = Layer0.getInstance(graph);
 381                 Layer0X L0X = Layer0X.getInstance(graph);
 382
 383                 Datatype literalDatatype = graph.getPossibleRelatedValue(value, L0.HasDataType, Bindings.DATATYPE);
 384                 if(literalDatatype != null) return getSCLType(literalDatatype);
 385
 386                 String literalValueType = graph.getPossibleRelatedValue(value, L0.HasValueType, Bindings.STRING);
 387                 if(literalValueType != null) return literalValueType;
 388
 389                 if(predicate != null) {
 390
 391                         Datatype requiredDataType = graph.getPossibleRelatedValue(predicate, L0X.RequiresDataType, Bindings.DATATYPE);
 392                         if(requiredDataType != null) return getSCLType(requiredDataType);
 393
 394                         throw new DatabaseException("Unidentified literal data type for property " + NameUtils.getURIOrSafeNameInternal(graph, predicate));
 395
 396                 }
 397
 398                 throw new DatabaseException("Unidentified literal data type");
 399
 400         }
 401
 402         public static Datatype getDatatype(ReadGraph graph, Variable variable) throws DatabaseException {
 403                 Datatype result = getPossibleDatatype(graph, variable);
 404                 if(result != null) return result;
 405                 throw new DatabaseException("Unidentified literal data type for property " + variable.getURI(graph));
 406         }
 407
 408         public static Datatype getPossibleDatatype(ReadGraph graph, Variable variable) throws DatabaseException {
 409                 return getPossibleDatatype(graph, variable, null, true);
 410         }
 411
 412         private static Datatype getPossibleDatatype(ReadGraph graph, Variable variable, PropertyInfo info, boolean checkPropertyDatatype) throws DatabaseException {
 413                 Layer0 L0 = Layer0.getInstance(graph);
 414                 Layer0X L0X = Layer0X.getInstance(graph);
 415
 416                 Resource property = variable.getPossiblePredicateResource(graph);
 417                 if(checkPropertyDatatype && property != null) {
 418                         Datatype requiredDataType = graph.syncRequest(new PossibleRelatedValue<Datatype>(property, L0X.RequiresDataType, Bindings.DATATYPE));
 419                         if(requiredDataType != null) return requiredDataType;
 420                 }
 421
 422                 Resource literal = variable.getPossibleRepresents(graph);
 423                 if(literal != null) {
 424                         Datatype literalDatatype = graph.getPossibleRelatedValue2(literal, L0.HasDataType, new StandardGraphPropertyVariable(graph, variable, null, literal, L0.HasDataType), Bindings.DATATYPE);
 425                         if(literalDatatype != null) return literalDatatype;
 426                 }
 427
 428                 if(property != null) {
 429
 430                         String requiredValueType = info != null
 431                                         ? info.requiredValueType
 432                                         : graph.getPossibleRelatedValue(property, L0.RequiresValueType, Bindings.STRING);
 433                         if(requiredValueType != null) {
 434                                 Datatype datatype = getPossibleDatatypeForValueType(requiredValueType);
 435                                 if(datatype != null) return datatype;
 436                         }
 437
 438                         Resource subject = variable.getParent(graph).getPossibleRepresents(graph);
 439                         if(subject != null) {
 440                                 Set<Resource> asses = new HashSet<Resource>();
 441                                 for(Resource type : graph.getTypes(subject)) {
 442                                         asses.addAll(graph.getAssertedObjects(type, property));
 443                                 }
 444                                 if(asses.size() == 1) {
 445                                         Resource ass = asses.iterator().next();
 446                                         Datatype dt = graph.getPossibleRelatedValue(ass, L0.HasDataType, Bindings.getBindingUnchecked(Datatype.class));
 447                                         if(dt != null) return dt;
 448                                 }
 449                         }
 450
 451                 }
 452
 453                 return null;
 454         }
 455
 456         private static Datatype getPossibleDatatypeForValueType(String requiredValueType) throws DatabaseException {
 457
 458                 String[] split = requiredValueType.split(" ");
 459                 String arrayType = null;
 460                 if(split.length == 2 && "Array".equals(split[0])) {
 461                         arrayType = split[1];
 462                 } else if(requiredValueType.startsWith("[") && requiredValueType.endsWith("]")) {
 463                         arrayType = requiredValueType.substring(1, requiredValueType.length()-1);
 464                 }
 465
 466                 Datatype arrayDataType = getDatatypeForType(arrayType != null ? arrayType : requiredValueType, arrayType != null);
 467                 if(arrayDataType != null)
 468                         return arrayDataType;
 469
 470                 Datatype dt = Datatypes.getDatatype(requiredValueType);
 471                 if(dt != null) return dt;
 472
 473                 try {
 474                         return Datatypes.translate(requiredValueType);
 475                 } catch (DataTypeSyntaxError e) {
 476                         return null;
 477                 }
 478
 479         }
 480
 481         private static Datatype getDatatypeForType(String type, boolean isArray) {
 482                 switch (type) {
 483                         case "Double":  return isArray ? Datatypes.DOUBLE_ARRAY  : Datatypes.DOUBLE;
 484                         case "String":  return isArray ? Datatypes.STRING_ARRAY  : Datatypes.STRING;
 485                         case "Integer": return isArray ? Datatypes.INTEGER_ARRAY : Datatypes.INTEGER;
 486                         case "Long":    return isArray ? Datatypes.LONG_ARRAY    : Datatypes.LONG;
 487                         case "Float":   return isArray ? Datatypes.FLOAT_ARRAY   : Datatypes.FLOAT;
 488                         case "Byte":    return isArray ? Datatypes.BYTE_ARRAY    : Datatypes.BYTE;
 489                         case "Boolean": return isArray ? Datatypes.BOOLEAN_ARRAY : Datatypes.BOOLEAN;
 490                         case "Variant": return isArray ? Datatypes.VARIANT_ARRAY : Datatypes.VARIANT;
 491                 }
 492                 return null;
 493         }
 494
 495         public static Binding getDefaultBinding(ReadGraph graph, Variable variable) throws DatabaseException {
 496
 497                 Resource property = variable.getPossiblePredicateResource(graph);
 498                 if(property != null) {
 499                         PropertyInfo info = graph.syncRequest(new PropertyInfoRequest(property), TransientCacheAsyncListener.<PropertyInfo>instance());
 500                         if(info.defaultBinding != null) return info.defaultBinding;
 501                 }
 502
 503                 Datatype type = getDatatype(graph, variable);
 504                 return Bindings.getBinding(type);
 505
 506         }
 507
 508         public static Binding getPossibleDefaultBinding(ReadGraph graph, Variable variable) throws DatabaseException {
 509
 510                 Resource property = variable.getPossiblePredicateResource(graph);
 511                 PropertyInfo info = null;
 512                 if(property != null) {
 513                         info = graph.syncRequest(new PropertyInfoRequest(property), TransientCacheAsyncListener.<PropertyInfo>instance());
 514                         if(info.defaultBinding != null) return info.defaultBinding;
 515                 }
 516
 517                 Datatype type = getPossibleDatatype(graph, variable, info, false);
 518                 if (type == null) return null;
 519
 520                 return Bindings.getBinding(type);
 521
 522         }
 523
 524         public static String getPossibleUnit(Datatype dt) {
 525                 if (dt == null)
 526                         return null;
 527                 else if (dt instanceof NumberType) {
 528                         return ((NumberType) dt).getUnit();
 529                 } else if (dt instanceof ArrayType) {
 530                         ArrayType at = (ArrayType) dt;
 531                         Datatype cdt = at.componentType();
 532                         if (cdt instanceof NumberType) {
 533                                 return ((NumberType) cdt).getUnit();
 534                         }
 535                 }
 536                 return null;
 537
 538         }
 539
 540         public static String getUnit(ReadGraph graph, Variable variable) throws DatabaseException {
 541
 542                 Layer0 L0 = Layer0.getInstance(graph);
 543                 Layer0X L0X = Layer0X.getInstance(graph);
 544
 545                 Resource literal = variable.getPossibleRepresents(graph);
 546                 if(literal == null)
 547                     return "";
 548
 549                 Datatype literalDatatype = graph.getPossibleRelatedValue2(literal, L0.HasDataType, new StandardGraphPropertyVariable(graph, variable, null, literal, L0.HasDataType), Bindings.DATATYPE);
 550                 if(literalDatatype != null) {
 551                         String unit = getPossibleUnit(literalDatatype);
 552                         if(unit != null) return unit;
 553                 }
 554
 555                 Resource property = variable.getPossiblePredicateResource(graph);
 556                 if(property != null) {
 557
 558                         Datatype requiredDataType = graph.getPossibleRelatedValue(property, L0X.RequiresDataType, Bindings.DATATYPE);
 559                         if(requiredDataType != null) {
 560                                 String unit = getPossibleUnit(requiredDataType);
 561                                 if(unit != null) return unit;
 562                         }
 563
 564                 }
 565
 566                 return "";
 567
 568         }
 569
 570         public static void claimAdaptedValue(WriteGraph graph, Resource objectResource, Object value, Binding binding, Datatype targetDatatype) throws DatabaseException {
 571
 572                 try {
 573
 574                         Datatype sourceDatatype = binding.type();
 575                         if(sourceDatatype.equals(targetDatatype)) {
 576                                 graph.claimValue(objectResource, value, binding);
 577                         } else {
 578                                 Binding target = Bindings.getBinding(targetDatatype);
 579                                 Adapter adapter = Bindings.getTypeAdapter(binding, target);
 580                                 graph.claimValue(objectResource, adapter.adapt(value), target);
 581                         }
 582
 583                 } catch (AdapterConstructionException e) {
 584                         throw new DatabaseException(e);
 585                 } catch (AdaptException e) {
 586                         throw new DatabaseException(e);
 587                 }
 588
 589         }
 590
 591         public static String toString(Object value, Binding binding) throws DatabaseException {
 592                 try {
 593                         if(value instanceof String) return (String)value;
 594                         StringBuilder sb = new StringBuilder();
 595                         DataValueRepository rep = new DataValueRepository();
 596                         binding.printValue(value, sb, rep, false);
 597                         return sb.toString();
 598                 } catch (BindingException e) {
 599                         throw new DatabaseException(e);
 600                 } catch (IOException e) {
 601                         throw new DatabaseException(e);
 602                 }
 603         }
 604
 605         public static Object parseValue(String text, Binding binding) throws DatabaseException {
 606                 try {
 607                         if(binding.isInstance(text)) return text;
 608                         DataValueRepository rep = new DataValueRepository();
 609                         return binding.parseValue(text, rep);
 610                 } catch (BindingException e) {
 611                         throw new DatabaseException(e);
 612                 } catch (DataTypeSyntaxError e) {
 613                         throw new DatabaseException(e);
 614                 }
 615         }
 616
 617         @SuppressWarnings("unchecked")
 618         public static <T> T getValueAdaptedToBinding(ReadGraph graph, Resource literal, Binding targetBinding) throws DatabaseException {
 619                 Datatype sourceDatatype = graph.getDataType(literal);
 620                 Datatype targetDatatype = targetBinding.type();
 621                 if (sourceDatatype.equals(targetDatatype))
 622                         return graph.getValue(literal, targetBinding);
 623
 624                 Binding sourceBinding = Bindings.getBinding(sourceDatatype);
 625                 try {
 626                         Adapter adapter = Bindings.adapterFactory.getAdapter(Bindings.getBinding(sourceDatatype), targetBinding, true, false);
 627                         Object value = graph.getValue(literal, sourceBinding);
 628                         return (T) adapter.adaptUnchecked(value);
 629                 } catch (AdapterConstructionException e) {
 630                         throw new DatabaseException(e);
 631                 }
 632         }
 633
 634         public static Statement getStatementInLocal(Resource subject, Statement statement) {
 635                 if(statement.isAsserted(subject)) return new StandardStatement(subject, statement.getPredicate(), statement.getObject());
 636                 else return statement;
 637         }
 638
 639         public static Resource browsePossible(ReadGraph graph, Resource root, String suffix) throws DatabaseException {
 640                 return graph.getPossibleResource(graph.getURI(root) + suffix);
 641         }
 642
 643         @Deprecated
 644         public static Resource getPossibleChild(ReadGraph graph, Resource resource, String name) throws DatabaseException {
 645                 return CommonDBUtils.getPossibleChild(graph, resource, name);
 646         }
 647
 648         @Deprecated
 649         public static Resource getPossibleChild(ReadGraph graph, Resource resource, Resource type, String name) throws DatabaseException {
 650                 return CommonDBUtils.getPossibleChild(graph, resource, type, name);
 651         }
 652
 653         public static RelationContext relationContext(ReadGraph graph, Resource subject, Resource predicate) throws DatabaseException {
 654                 Statement stm = graph.getSingleStatement(subject, predicate);
 655                 return new RelationContextImpl(subject, stm);
 656         }
 657
 658         public static RelationContext relationContext(Statement stm) throws DatabaseException {
 659                 return new RelationContextImpl(stm.getSubject(), stm);
 660         }
 661
 662         public static <T> T valueInRelationContext(ReadGraph graph, Resource subject, Statement stm) throws DatabaseException {
 663                 return graph.getValue2(subject, Layer0Utils.relationContext(stm));
 664         }
 665
 666         public static <T> T valueInRelationContext(ReadGraph graph, Resource subject, Statement stm, Binding binding) throws DatabaseException {
 667                 return graph.getValue2(subject, Layer0Utils.relationContext(stm), binding);
 668         }
 669
 670         public static <T> T relatedValueInRelationContext(ReadGraph graph, Resource subject, Resource relation) throws DatabaseException {
 671                 Statement stm = getStatementInLocal(subject, graph.getSingleStatement(subject, relation));
 672                 return valueInRelationContext(graph, stm.getObject(), stm);
 673         }
 674
 675         public static <T> T relatedValueInRelationContext(ReadGraph graph, Resource subject, Resource relation, Binding binding) throws DatabaseException {
 676                 Statement stm = getStatementInLocal(subject, graph.getSingleStatement(subject, relation));
 677                 return valueInRelationContext(graph, stm.getObject(), stm, binding);
 678         }
 679
 680         public static Statement possibleObtainedStatementInternal(ReadGraph graph, Resource subject, Resource relation) throws DatabaseException {
 681
 682                 Layer0X L0X = Layer0X.getInstance(graph);
 683
 684                 for(Resource ob : graph.getObjects(subject, L0X.DefinesObtainedStatement)) {
 685                         Resource pred = graph.getSingleObject(ob, L0X.ObtainedStatement_predicate);
 686                         if(graph.isSubrelationOf(pred, relation)) {
 687                                 Resource object = graph.getSingleObject(ob, L0X.ObtainedStatement_object);
 688                                 return new StandardStatement(subject, pred, object);
 689                         }
 690                 }
 691
 692                 ArrayList<OrderedResource> order = new ArrayList<OrderedResource>();
 693                 for(Statement stm : graph.getStatements(subject, L0X.ObtainsProperty)) {
 694                         Integer position = graph.getRelatedValue(stm.getPredicate(), L0X.NaturalNumberOrderRelation, Bindings.INTEGER);
 695                         order.add(new OrderedResource(position, stm.getObject()));
 696                 }
 697
 698                 for(OrderedResource or : order) {
 699                         Statement stm = possibleObtainedStatementInternal(graph, or.r, relation);
 700                         if(stm != null) return stm;
 701                 }
 702
 703                 return null;
 704
 705         }
 706
 707         public static <T> T possibleObtainedValue(ReadGraph graph, RelationContext ctx, Binding binding) throws DatabaseException {
 708
 709                 Statement stm = ctx.getStatement();
 710                 Statement obj = Layer0Utils.possibleObtainedStatementInternal(graph, stm.getSubject(), stm.getPredicate());
 711
 712                 if(obj != null) {
 713                         return Layer0Utils.valueInRelationContext(graph, obj.getObject(), obj, binding);
 714                 } else {
 715                         return null;
 716                 }
 717
 718         }
 719
 720         public static void addObtainedStatement(WriteGraph graph, Resource subject, Resource predicate, Resource object) throws DatabaseException {
 721                 Layer0 L0 = Layer0.getInstance(graph);
 722                 Layer0X L0X = Layer0X.getInstance(graph);
 723                 Resource ob = graph.newResource();
 724                 graph.claim(ob, L0.InstanceOf, null, L0X.ObtainedStatement);
 725                 graph.claim(ob, L0X.ObtainedStatement_predicate, null, predicate);
 726                 graph.claim(ob, L0X.ObtainedStatement_object, null, object);
 727                 graph.claim(subject, L0X.DefinesObtainedStatement, null, ob);
 728         }
 729
 730         public static void addObtainedValue(WriteGraph graph, Resource subject, Resource predicate, Resource type, Object value, Binding binding) throws DatabaseException {
 731                 Layer0 L0 = Layer0.getInstance(graph);
 732                 Resource object = graph.newResource();
 733                 graph.claim(object, L0.InstanceOf, type);
 734                 graph.claimValue(object, value, binding);
 735                 Layer0Utils.addObtainedStatement(graph, subject, predicate, object);
 736         }
 737
 738         //-------------------------------------------------------------------------
 739         // Indexing state query utilities idle handling utilities
 740         //-------------------------------------------------------------------------
 741
 742         /**
 743          * This method waits until the indexing engine becomes idle.
 744          * @since 1.8
 745          */
 746         public static void waitIndexPending() {
 747                 Indexing.waitIndexPending();
 748         }
 749
 750         /**
 751          * @param graph an active database write handle to prove one is in a write
 752          *        transaction and wants to disable dependencies indexing for this
 753          *        transaction only.
 754          * @return previous value
 755          * @since 1.8
 756          */
 757         public static boolean setDependenciesIndexingDisabled(WriteOnlyGraph graph, boolean disabled) {
 758                 return Indexing.setDependenciesIndexingDisabled(graph, disabled);
 759         }
 760
 761         public static String undo() throws DatabaseException {
 762
 763             Session session = SimanticsInternal.getSession();
 764
 765         UndoRedoSupport support = session.getService(UndoRedoSupport.class);
 766
 767         List<Operation> ops = support.undoAndReturnOperations(session, 1);
 768         if(ops.isEmpty())
 769             return "Undo history is empty.";
 770
 771         Operation mainOperation = ops.get(0);
 772
 773         long csId = mainOperation.getCSId();
 774
 775         ManagementSupport management = session.getService(ManagementSupport.class);
 776         Collection<ChangeSetIdentifier> ids = management.getChangeSetIdentifiers(csId, csId);
 777
 778         return "Undo reverted " + ids.size() + " change sets.";
 779
 780         }
 781
 782         public static String undoOperations(int amountOfOperations) throws DatabaseException {
 783
 784             Session session = SimanticsInternal.getSession();
 785
 786         UndoRedoSupport support = session.getService(UndoRedoSupport.class);
 787
 788         List<Operation> ops = support.undoAndReturnOperations(session, amountOfOperations);
 789         if(ops.isEmpty())
 790             return "Undo history is empty.";
 791
 792         Operation mainOperation = ops.get(0);
 793
 794         long csId = mainOperation.getCSId();
 795
 796         ManagementSupport management = session.getService(ManagementSupport.class);
 797         Collection<ChangeSetIdentifier> ids = management.getChangeSetIdentifiers(csId, csId);
 798
 799         return "Undo reverted " + ids.size() + " change sets.";
 800
 801         }
 802
 803         public static String redo() throws DatabaseException {
 804
 805             Session session = SimanticsInternal.getSession();
 806
 807         UndoRedoSupport support = session.getService(UndoRedoSupport.class);
 808
 809         List<Operation> ops = support.redo(session, 1);
 810         if(ops.isEmpty())
 811             return "Redo history is empty.";
 812
 813         Operation mainOperation = ops.get(0);
 814
 815         long csId = mainOperation.getCSId();
 816
 817         ManagementSupport management = session.getService(ManagementSupport.class);
 818         Collection<ChangeSetIdentifier> ids = management.getChangeSetIdentifiers(csId, csId);
 819
 820         return "Redo redid " + ids.size() + " change sets.";
 821
 822         }
 823
 824         public static String getComment(Session session, ChangeSetIdentifier id) {
 825             byte[] data = id.getMetadata().get(CommentMetadata.class.getName());
 826             if(data == null)
 827                 return "Undescribed operation.";
 828             String comment = CommentMetadata.deserialise(session, data).toString().trim();
 829             if(comment.isEmpty())
 830                 return "Undescribed operation.";
 831             return comment;
 832         }
 833
 834     /**
 835      * This method adds CommentMetadata for write transaction. CommentMetadata is used e.g. in Undo view.
 836      * @param graph
 837      *    graph handle
 838      * @param string
 839      *    comment
 840      * @throws ServiceException
 841      */
 842     public static void addCommentMetadata(WriteOnlyGraph graph, String string) throws ServiceException {
 843         // Add a comment to metadata.
 844         CommentMetadata cm = graph.getMetadata(CommentMetadata.class);
 845         graph.addMetadata(cm.add(ObjectUtils.toString(string)));
 846     }
 847
 848         //-------------------------------------------------------------------------
 849
 850         /**
 851          * Copy the specified source resource into the specified container using the
 852          * specified write transaction handle.
 853          *
 854          * @param graph write transaction handle
 855          * @param targetContainer target container resource of the created copy. The
 856          *        exact logic of how the copy will be contained by the target
 857          *        container is up to the PasteHandler to decide
 858          * @param source the source resource to copy
 859          * @throws DatabaseException
 860          * @since 1.8
 861          */
 862         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, Resource source) throws DatabaseException {
 863                 return copyTo(graph, targetContainer, source, null, null, null);
 864         }
 865
 866         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, Resource source, PasteEventHandler handler) throws DatabaseException {
 867                 return copyTo(graph, targetContainer, source, handler, null, null);
 868         }
 869
 870         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, Resource source, PasteEventHandler handler, CopyHandler copyHandler, PasteHandler pasteHandler) throws DatabaseException {
 871                 if(copyHandler == null) copyHandler = graph.adapt(source, CopyHandler.class);
 872                 return copyTo(graph, targetContainer, handler, copyHandler, pasteHandler);
 873         }
 874
 875         public static Collection<Resource> copyTo(WriteGraph graph, Resource targetContainer, PasteEventHandler handler, CopyHandler copyHandler, PasteHandler pasteHandler) throws DatabaseException {
 876                 SimanticsClipboardImpl clipboard = new SimanticsClipboardImpl();
 877                 copyHandler.copyToClipboard(graph, clipboard, new NullProgressMonitor());
 878                 if(targetContainer != null) {
 879                         if(pasteHandler == null) pasteHandler = graph.adapt(targetContainer, PasteHandler.class);
 880                         return pasteHandler.pasteFromClipboard(graph, clipboard, handler);
 881                 } else {
 882                         DefaultPasteHandler ph = new DefaultPasteHandler(null);
 883                         return ph.pasteFromClipboard(graph, clipboard, handler);
 884                 }
 885         }
 886
 887         public static CopyHandler2 getPossibleCopyHandler(ReadGraph graph, Collection<Resource> rs) throws DatabaseException {
 888         CopyHandler2 ch = null;
 889         for(Resource r : rs) {
 890             if(ch == null) {
 891                 CopyHandler ch2_ = graph.adapt(r, CopyHandler.class);
 892                 if(ch2_ instanceof CopyHandler2) {
 893                     ch = (CopyHandler2)ch2_;
 894                 }
 895             } else {
 896                 CopyHandler ch2_ = graph.adapt(r, CopyHandler.class);
 897                 if(ch2_ instanceof CopyHandler2) {
 898                     CopyHandler2 ch2 = (CopyHandler2)ch2_;
 899                     ch = ch.combine(ch2);
 900                 }
 901             }
 902         }
 903         return ch;
 904         }
 905
 906         public static ClusterCollectorPolicy setClusterCollectorPolicy(ClusterCollectorPolicy policy) {
 907                 Session session = SimanticsInternal.getSession();
 908                 ClusterControl cc = session.getService(ClusterControl.class);
 909                 return cc.setPolicy(policy);
 910         }
 911
 912         private static String decodeType(ReadGraph graph, Variable variable) throws DatabaseException {
 913                 Datatype dt = getDatatype(graph, variable);
 914                 return dt.toSingleLineString();
 915         }
 916
 917         private static boolean isAsserted(ReadGraph graph, Resource subject, Resource predicate) throws DatabaseException {
 918                 Statement stm = graph.getPossibleStatement(subject, predicate);
 919                 return stm != null && stm.isAsserted(subject);
 920         }
 921
 922         /*
 923          * Works around problems in WriteGraph methods with similar signature.
 924          * Especially handles better some cases with existing literals.
 925          *
 926          */
 927         public static void claimLiteral(WriteGraph graph, Resource r, Resource p, Resource i, Resource t, Object value, Binding binding) throws DatabaseException {
 928             Statement stm = graph.getPossibleStatement(r, p);
 929             if(stm != null && !stm.isAsserted(r)) {
 930                 if(graph.isInstanceOf(stm.getObject(), t)) {
 931                     // Existing statement is compatible, reuse the literal
 932                     graph.claimValue(stm.getObject(), value, binding);
 933                     return;
 934                 } else {
 935                     // Existing statement is incompatible - remove it
 936                     graph.deny(stm);
 937                 }
 938             }
 939             // Create new statement
 940             graph.claimLiteral(r, p, i, t, value, binding);
 941         }
 942
 943         public static void setExpression(WriteGraph graph, Variable context, String text, Resource expressionValueType) throws DatabaseException {
 944
 945                 Resource value = context.getRepresents(graph);
 946                 Resource predicateResource = context.getPredicateResource(graph);
 947                 Variable parent = context.getParent(graph);
 948                 Resource parentResource = parent.getRepresents(graph);
 949                 setExpression(graph, parentResource, predicateResource, value, text, expressionValueType);
 950
 951         }
 952
 953         public static void setExpression(WriteGraph graph, Resource parentResource, Resource predicateResource, Resource value, String text, Resource expressionValueType) throws DatabaseException {
 954
 955                 Layer0 L0 = Layer0.getInstance(graph);
 956                 boolean hasExpression = graph.isInstanceOf(value, expressionValueType);
 957                 String t = getSCLTypeString(graph, predicateResource, value);
 958                 String expression = text.substring(1).trim();
 959                 if(isAsserted(graph, parentResource, predicateResource)) {
 960                         Resource newValue = graph.newResource();
 961                         graph.claim(newValue, L0.InstanceOf, expressionValueType);
 962                         graph.claimLiteral(newValue, L0.HasValueType, t, Bindings.STRING);
 963                         graph.claimLiteral(newValue, L0.SCLValue_expression, expression, Bindings.STRING);
 964                         graph.claim(parentResource, predicateResource, newValue);
 965                 } else {
 966                         if(hasExpression) {
 967                                 graph.claimLiteral(value, L0.SCLValue_expression, expression, Bindings.STRING);
 968                         } else {
 969                                 Resource newValue = graph.newResource();
 970                                 graph.claim(newValue, L0.InstanceOf, expressionValueType);
 971                                 graph.claimLiteral(newValue, L0.HasValueType, t, Bindings.STRING);
 972                                 graph.claimLiteral(newValue, L0.SCLValue_expression, expression, Bindings.STRING);
 973                                 graph.deny(parentResource, predicateResource);
 974                                 graph.claim(parentResource, predicateResource, newValue);
 975                         }
 976                 }
 977
 978         }
 979
 980         public static void clearExpression(WriteGraph graph, Variable property, Resource expressionValueType) throws DatabaseException {
 981
 982                 Resource object = property.getPossibleRepresents(graph);
 983                 if(object != null) {
 984                         boolean hasExpression = graph.isInstanceOf(object, expressionValueType);
 985                         if(hasExpression) {
 986                                 // There was an expression and now we go back to a value
 987                                 Resource subject = property.getParent(graph).getPossibleRepresents(graph);
 988                                 if(subject != null) {
 989                                         Resource predicate = property.getPossiblePredicateResource(graph);
 990                                         if(predicate != null) {
 991                                                 graph.deny(subject, predicate, object);
 992                                                 RemoverUtil.remove(graph, object);
 993                                         }
 994                                 }
 995                         }
 996                 }
 997
 998         }
 999
1000         public static boolean setOrClearExpression(WriteGraph graph, Variable property, String text, Resource expressionValueType) throws DatabaseException {
1001
1002                 if(text.startsWith("=")) {
1003                         setExpression(graph, property, text, expressionValueType);
1004                         return true;
1005                 }
1006
1007                 clearExpression(graph, property, expressionValueType);
1008
1009                 return false;
1010
1011         }
1012
1013         public static void setValueAsString(WriteGraph graph, Variable property, String text, Resource expressionValueType) throws DatabaseException {
1014
1015                 try {
1016
1017                         if (setOrClearExpression(graph, property, text, expressionValueType))
1018                                 return;
1019
1020                         Object value = text;
1021                         Datatype type = property.getPossibleDatatype(graph);
1022                         if (type != null) {
1023
1024                                 Binding binding = Bindings.getBinding(type);
1025
1026                                 if (binding instanceof StringBinding) {
1027
1028                                         if (binding instanceof MutableStringBinding)
1029                                                 value = new MutableString(text);
1030                                         else
1031                                                 value = text;
1032
1033                                 } else {
1034
1035                                         if (binding instanceof NumberBinding) {
1036                                                 text = text.replace(",", ".");
1037                                         }
1038
1039                                         value = binding.parseValue(text, new DataValueRepository());
1040
1041                                 }
1042
1043                                 property.setValue(graph, value, binding);
1044
1045                         } else {
1046
1047                                 property.setValue(graph, value);
1048
1049                         }
1050
1051                         // Add a comment to metadata.
1052                         CommentMetadata cm = graph.getMetadata(CommentMetadata.class);
1053                         graph.addMetadata(cm.add("Set value " + ObjectUtils.toString(value)));
1054
1055                 } catch (DataTypeSyntaxError e) {
1056                         throw new DatabaseException(e);
1057                 } catch (BindingException e) {
1058                         throw new DatabaseException(e);
1059                 }
1060
1061         }
1062
1063
1064     public static String queryDebugSupport(String query) {
1065         Session session = SimanticsInternal.getSession();
1066         DebugSupport ds = session.getService(DebugSupport.class);
1067         return ds.query(session, "exec " + query);
1068     }
1069
1070     public static String queryListSupport (String query) {
1071         Session session = SimanticsInternal.getSession();
1072         DebugSupport ds = session.getService(DebugSupport.class);
1073         return ds.query(session, "list " + query);
1074     }
1075
1076     final public static Function1<Resource,Resource> resourceCluster = new FunctionImpl1<Resource, Resource>() {
1077                 @Override
1078                 public Resource apply(Resource p0) {
1079                         return p0;
1080                 }
1081         };
1082
1083         public static void sort(ReadGraph graph, List<Resource> collection) {
1084         CollectionSupport cos = graph.getService(CollectionSupport.class);
1085         cos.sort(collection);
1086         }
1087
1088         public static List<Resource> sortByCluster(ReadGraph graph, Collection<Resource> collection) {
1089         CollectionSupport cos = graph.getService(CollectionSupport.class);
1090         return cos.asSortedList(collection);
1091         }
1092
1093         public static List<Object> sortByCluster(final ReadGraph graph, List<Object> list, final Function1<Object,Resource> fn) {
1094         final ClusteringSupport cs = graph.getService(ClusteringSupport.class);
1095         ArrayList<Object> result = new ArrayList<Object>(list);
1096         Collections.sort(result, new Comparator<Object>() {
1097
1098                         @Override
1099                         public int compare(Object o1, Object o2) {
1100                                 Resource r1 = fn.apply(o1);
1101                                 Resource r2 = fn.apply(o2);
1102                                 long l1 = cs.getCluster(r1);
1103                                 long l2 = cs.getCluster(r2);
1104                                 if(l1 < l2) return -1;
1105                                 else if (l1 > l2) return 1;
1106                                 else return 0;
1107                         }
1108
1109         });
1110         return result;
1111     }
1112
1113     public static <T> List<T> sortByClusterT(final ReadGraph graph, Collection<T> list, final Function1<T,Resource> fn) {
1114         final ClusteringSupport cs = graph.getService(ClusteringSupport.class);
1115         ArrayList<T> result = new ArrayList<T>(list);
1116         Collections.sort(result, new Comparator<Object>() {
1117
1118             @Override
1119             public int compare(Object o1, Object o2) {
1120                 Resource r1 = fn.apply((T)o1);
1121                 Resource r2 = fn.apply((T)o2);
1122                 long l1 = cs.getCluster(r1);
1123                 long l2 = cs.getCluster(r2);
1124                 if(l1 < l2) return -1;
1125                 else if (l1 > l2) return 1;
1126                 else return 0;
1127             }
1128
1129         });
1130         return result;
1131     }
1132
1133     public static void makeSynchronous(ReadGraph graph, boolean value) throws DatabaseException {
1134         graph.setSynchronous(value);
1135     }
1136
1137     public static Set<Resource> listIndexRoots(ReadGraph graph) throws DatabaseException {
1138
1139         Layer0 L0 = Layer0.getInstance(graph);
1140
1141                 Set<Resource> indexRoots = new TreeSet<Resource>();
1142                 indexRoots.addAll(Layer0Utils.listOntologies(graph));
1143                 indexRoots.addAll(graph.syncRequest(new ObjectsWithType(SimanticsInternal.getProject(), L0.ConsistsOf, L0.IndexRoot)));
1144                 return indexRoots;
1145
1146     }
1147
1148     public static List<Resource> listOntologies(ReadGraph graph) throws DatabaseException {
1149         return graph.syncRequest(new OntologiesFromLibrary(graph.getRootLibrary()));
1150     }
1151
1152     public static List<Resource> listGlobalOntologies(ReadGraph graph) throws DatabaseException {
1153         return graph.syncRequest(new GlobalOntologies(graph.getRootLibrary()));
1154     }
1155
1156     public static <T> T applySCL(String module, String function, ReadGraph graph, Object ... args) throws DatabaseException {
1157
1158                 try {
1159                         SCL_GRAPH.set(graph);
1160                         T t = (T)((Function)SCLOsgi.MODULE_REPOSITORY.getValue(module + "/" + function)).applyArray(args);
1161                         SCL_GRAPH.set(null);
1162                         return t;
1163                 } catch (Throwable t) {
1164                         throw new DatabaseException(t);
1165                 }
1166
1167     }
1168
1169     public static boolean isContainerPublished(ReadGraph graph, Variable variable) throws DatabaseException {
1170
1171         Resource indexRoot = graph.syncRequest(new PossibleVariableIndexRoot(variable));
1172         if(indexRoot == null) return false;
1173         Resource represents = variable.getPossibleRepresents(graph);
1174         if(represents != null && represents.equals(indexRoot)) return false;
1175         return isPublished(graph, indexRoot);
1176
1177     }
1178
1179     public static boolean isContainerPublished(ReadGraph graph, Resource resource) throws DatabaseException {
1180
1181         Resource indexRoot = graph.syncRequest(new PossibleIndexRoot(resource));
1182         if(indexRoot == null) return false;
1183         if(resource.equals(indexRoot)) return false;
1184         return isPublished(graph, indexRoot);
1185
1186     }
1187
1188     public static boolean isPublished(ReadGraph graph, Resource resource) throws DatabaseException {
1189
1190         Layer0 L0 = Layer0.getInstance(graph);
1191         Boolean value = graph.getPossibleRelatedValue(resource, L0.Entity_published, Bindings.BOOLEAN);
1192         if(value != null && value) return true;
1193
1194         // This is safety - root should not be published it child is not
1195         Resource root = graph.syncRequest(new PossibleIndexRoot(resource));
1196         if(root != null) {
1197                 value = graph.getPossibleRelatedValue(root, L0.Entity_published, Bindings.BOOLEAN);
1198                 if(value != null && value) return true;
1199         }
1200
1201         return false;
1202
1203     }
1204
1205     public static boolean isMarkedReadOnly(ReadGraph graph, Resource r) throws DatabaseException {
1206         return Boolean.TRUE.equals( graph.getPossibleRelatedValue(r, graph.<Layer0>l0().readOnly, Bindings.BOOLEAN) );
1207     }
1208
1209     private static TransferableGraph1 makeTG(ReadGraph graph, Resource r) throws DatabaseException {
1210
1211         SimanticsClipboardImpl cp = new SimanticsClipboardImpl();
1212         CopyHandler c1 = graph.adapt(r, CopyHandler.class);
1213         c1.copyToClipboard(graph, cp, null);
1214         Collection<Set<Representation>> reps = cp.getContents();
1215         if(reps.size() != 1) return null;
1216         return ClipboardUtils.accept(graph, reps.iterator().next(), SimanticsKeys.KEY_TRANSFERABLE_GRAPH);
1217
1218     }
1219
1220     public static TransferableGraphSource makeTGSource(ReadGraph graph, Resource r) throws DatabaseException {
1221
1222         SimanticsClipboardImpl cp = new SimanticsClipboardImpl();
1223         CopyHandler c1 = graph.adapt(r, CopyHandler.class);
1224         c1.copyToClipboard(graph, cp, null);
1225         Collection<Set<Representation>> reps = cp.getContents();
1226         if(reps.size() != 1) return null;
1227         return ClipboardUtils.accept(graph, reps.iterator().next(), SimanticsKeys.KEY_TRANSFERABLE_GRAPH_SOURCE);
1228
1229     }
1230
1231     /*
1232      * Modifies target to resemble source.
1233      */
1234     public static boolean merge(WriteGraph graph, Resource source, Resource target) throws DatabaseException {
1235
1236         TransferableGraphSource tgs1 = makeTGSource(graph, target);
1237         TransferableGraph1 tg1 = TransferableGraphs.create(graph, tgs1);
1238         TransferableGraph1 tg2 = makeTG(graph, source);
1239
1240         GraphRefactoringUtils.fixIncorrectRoot(tg1.identities);
1241         GraphRefactoringUtils.fixIncorrectRoot(tg2.identities);
1242
1243         ModelTransferableGraphSource mtgs = (ModelTransferableGraphSource)tgs1;
1244
1245                 Diff diff = new Diff(tg1, tg2);
1246                 TransferableGraphDelta1 delta = diff.diff();
1247
1248                 long[] oldResources = mtgs.getResourceArray(graph);
1249                 if(TransferableGraphs.hasChanges(graph, oldResources, delta)) {
1250                         TransferableGraphs.applyDelta(graph, mtgs.getResourceArray(graph), delta);
1251                         return true;
1252                 } else {
1253                         return false;
1254                 }
1255
1256     }
1257
1258     public static Resource inferLiteralTypeFromString(ReadGraph graph, String text) {
1259         return Layer0.getInstance(graph).String;
1260     }
1261
1262     public static void emptyTrashBin() throws ServiceException {
1263         emptyTrashBin(new NullProgressMonitor());
1264     }
1265
1266     public static void emptyTrashBin(IProgressMonitor monitor) throws ServiceException {
1267         emptyTrashBin(monitor, SimanticsInternal.getSession(), SimanticsInternal.getProject());
1268     }
1269
1270     public static void emptyTrashBin(final IProgressMonitor monitor, Session session, final Resource project)
1271             throws ServiceException {
1272         final SubMonitor mon = SubMonitor.convert(monitor, "Emptying Trash Bin...", 10000);
1273         try {
1274             ArrayList<Resource> unhandled = new ArrayList<Resource>();
1275             session.syncRequest(new DelayedWriteRequest() {
1276                 @Override
1277                 public void perform(WriteGraph graph) throws DatabaseException {
1278                     Layer0Utils.setDependenciesIndexingDisabled(graph, true);
1279                     Layer0 L0 = Layer0.getInstance(graph);
1280                     Layer0X L0X = Layer0X.getInstance(graph);
1281                     Resource parent = graph.getSingleObject(project, L0.PartOf);
1282                     Resource trashBin = Layer0Utils.getPossibleChild(graph, parent, "TrashBin");
1283                     Collection<Resource> trashes = trashBin != null ? graph.getObjects(trashBin, L0.ConsistsOf)
1284                             : Collections.<Resource> emptyList();
1285                     if (trashes.isEmpty())
1286                         throw new CancelTransactionException();
1287                     mon.setWorkRemaining((2 + trashes.size()) * 1000);
1288                     for (Resource trash : trashes) {
1289                         if (mon.isCanceled())
1290                             throw new CancelTransactionException();
1291                         mon.subTask(NameUtils.getSafeName(graph, trash));
1292                         boolean isIndexRoot = graph.isInstanceOf(trash, L0.IndexRoot);
1293                         TGRemover remo = new TGRemover(mon.newChild(1000, SubMonitor.SUPPRESS_ALL_LABELS), trash);
1294                         try {
1295                             remo.remove(graph);
1296                             unhandled.addAll(remo.getRoots());
1297                         } catch (DatabaseException e) {
1298                             // Something went wrong - try to remove this later
1299                             // with EntityRemover
1300                             unhandled.add(trash);
1301                         }
1302                         if (isIndexRoot) {
1303                             // TODO: this should be an utility
1304                             GenericRelationIndex index = graph.adapt(L0X.DependenciesRelation,
1305                                     GenericRelationIndex.class);
1306                             IndexedRelations ir = graph.getService(IndexedRelations.class);
1307                             // Deletes index files
1308                             ir.reset(null, graph, L0X.DependenciesRelation, trash);
1309                             // Notifies DB listeners
1310                             index.reset(graph, trash);
1311                         }
1312                     }
1313                     if (mon.isCanceled())
1314                         throw new CancelTransactionException();
1315                     mon.subTask("Committing Changes");
1316                     mon.newChild(1000);
1317                 }
1318             });
1319
1320             session.syncRequest(new WriteRequest() {
1321                 @Override
1322                 public void perform(WriteGraph graph) throws DatabaseException {
1323                     for (Resource r : unhandled)
1324                         EntityRemover.remove(graph, r);
1325                 }
1326             });
1327
1328             if (mon.isCanceled())
1329                 return;
1330             mon.subTask("Purging Database");
1331             mon.newChild(1000);
1332             purgeDatabase(monitor, session);
1333         } catch (CancelTransactionException e) {
1334             // Ignore.
1335         } catch (DatabaseException e) {
1336             throw new ServiceException(e);
1337         }
1338     }
1339
1340     public static void purgeDatabase() throws ServiceException {
1341         purgeDatabase(new NullProgressMonitor());
1342     }
1343
1344     public static void purgeDatabase(final IProgressMonitor monitor) throws ServiceException {
1345         purgeDatabase(monitor, SimanticsInternal.getSession());
1346     }
1347
1348     public static void purgeDatabase(final IProgressMonitor monitor, Session session) throws ServiceException {
1349         try {
1350                 XSupport xs = session.getService(XSupport.class);
1351                 xs.purge();
1352         } catch (DatabaseException e) {
1353                 throw new ServiceException(e);
1354         }
1355     }
1356
1357     public static Resource getSingleDomainOf(ReadGraph graph, Resource type, Resource target) throws DatabaseException {
1358         Resource result = null;
1359         for(Resource candidate : getDomainOf(graph, type).values()) {
1360                 if(graph.isInstanceOf(candidate, target)) {
1361                         if(result != null) throw new DatabaseException("Multiple relations found for target " + graph.getURI(target) + " in type " + graph.getURI(type));
1362                         else result = candidate;
1363                 }
1364         }
1365         if(result == null) throw new DatabaseException("Multiple relations found for target " + graph.getURI(target) + " in type " + graph.getURI(type));
1366         return result;
1367     }
1368
1369     public static Map<String, Resource> getDomainOf(ReadGraph graph, Resource type) throws DatabaseException {
1370         CollectionSupport cs = graph.getService(CollectionSupport.class);
1371         Map<String, Resource> result = cs.createObjectResourceMap(String.class);
1372         Layer0 L0 = Layer0.getInstance(graph);
1373         for(Resource r : graph.getObjects(type, L0.DomainOf)) {
1374                 String name = graph.getPossibleRelatedValue(r, L0.HasName, Bindings.STRING);
1375                 if(name != null) result.put(name, r);
1376         }
1377         for(Resource t : graph.getSupertypes(type)) {
1378                 for(Resource r : graph.getObjects(t, L0.DomainOf)) {
1379                         String name = graph.getPossibleRelatedValue(r, L0.HasName, Bindings.STRING);
1380                         if(name != null) result.put(name, r);
1381                 }
1382         }
1383         return result;
1384     }
1385
1386     public static Resource possibleObjectForType(ReadGraph graph, Resource type, Resource relation) throws DatabaseException {
1387         PropertyInfo pi = graph.syncRequest(new PropertyInfoRequest(relation));
1388         return possibleObjectForType(graph, type, relation, pi.isFunctional);
1389     }
1390
1391     public static Resource possibleObjectForType(ReadGraph graph, Resource type, Resource relation, boolean functional) throws DatabaseException {
1392         if(functional) {
1393             Layer0 L0 = Layer0.getInstance(graph);
1394             Resource result = graph.getPossibleObject(type, relation);
1395             if(result != null)
1396                 return result;
1397             for(Resource su : graph.getObjects(L0.Inherits, type)) {
1398                 Resource r = possibleObjectForType(graph, su, relation, functional);
1399                 if(r != null) {
1400                     if(result != null)
1401                         return null;
1402                     result = r;
1403                 }
1404             }
1405             return result;
1406         } else {
1407             Set<Resource> found = objectsForTypeNonFunctional(graph, type, relation, new HashSet<>());
1408             return found.size() == 1 ? found.iterator().next() : null;
1409         }
1410     }
1411
1412     private static Set<Resource> objectsForTypeNonFunctional(ReadGraph graph, Resource type, Resource relation, Set<Resource> found) throws DatabaseException {
1413         Layer0 L0 = Layer0.getInstance(graph);
1414         found.addAll(graph.getObjects(type, relation));
1415         for(Resource su : graph.getObjects(L0.Inherits, type)) {
1416             objectsForTypeNonFunctional(graph, su, relation, found);
1417         }
1418         return found;
1419     }
1420
1421     public static Resource getPossiblePredicateByNameFromType(ReadGraph graph, Resource type, String name) throws DatabaseException {
1422         Map<String,Resource> domain = getDomainOf(graph, type);
1423         return domain.get(name);
1424     }
1425
1426     public static Resource getPossiblePredicateByName(ReadGraph graph, Resource instance, String predicateName) throws DatabaseException {
1427         for(Resource type : graph.getPrincipalTypes(instance)) {
1428                 Map<String, Resource> domainOf = getDomainOf(graph, type);
1429                 Resource predicate = domainOf.get(predicateName);
1430                 if(predicate != null) return predicate;
1431         }
1432         return null;
1433     }
1434
1435     public static Resource getPossiblePredicateByLabel(ReadGraph graph, Resource instance, String predicateName) throws DatabaseException {
1436         Layer0 L0 = Layer0.getInstance(graph);
1437         for(Resource type : graph.getPrincipalTypes(instance)) {
1438                 Map<String, Resource> domainOf = getDomainOf(graph, type);
1439                 for(Resource r : domainOf.values()) {
1440                         String label = graph.getPossibleRelatedValue(r, L0.HasLabel, Bindings.STRING);
1441                         if(predicateName.equals(label))
1442                                 return r;
1443                 }
1444         }
1445         return null;
1446     }
1447
1448     public static void claimLiteralDataboard(WriteGraph graph, Resource container, Resource property, String valueText) throws DatabaseException {
1449
1450         try {
1451                 PropertyInfo pi = graph.syncRequest(new PropertyInfoRequest(property));
1452                 if(pi.literalRange == null) throw new DatabaseException("No suitable literal type defined as range for property.");
1453                 if(pi.defaultBinding == null) throw new DatabaseException("No suitable default binding for property.");
1454                         Object value = pi.defaultBinding.parseValue(valueText, new DataValueRepository());
1455                         graph.claimLiteral(container, property, pi.literalRange, value, pi.defaultBinding);
1456                 } catch (DataTypeSyntaxError e) {
1457                         throw new DatabaseException(e);
1458                 } catch (BindingException e) {
1459                         throw new DatabaseException(e);
1460                 }
1461
1462     }
1463
1464     public static String prettyPrintResource(ReadGraph graph, Resource resource, boolean ignoreIdentifiers) throws Exception {
1465         TransferableGraphSource source = makeTGSource(graph, resource);
1466         TransferableGraph1 tg = TransferableGraphs.create(graph, source);
1467         GraphRefactoringUtils.fixOntologyExport(tg);
1468         System.out.println("Printing resoure " + graph.getURI(resource));
1469         return PrettyPrintTG.print(tg, ignoreIdentifiers);
1470     }
1471
1472     /**
1473      * Adds a random {@link GUID} as a value for <code>L0.identifier</code>
1474      *
1475      * @param graph
1476      * @param component
1477      *            for which the identifier is added
1478      * @param add
1479      *            <code>true</code> to invoke addLiteral, <code>false</code> to
1480      *            invoke claimLiteral
1481      * @throws DatabaseException
1482      */
1483     public static void claimNewIdentifier(WriteGraph graph, Resource component, boolean add) throws DatabaseException {
1484         Layer0 L0 = Layer0.getInstance(graph);
1485         GUID guid = GUID.random();
1486         if (add)
1487             graph.addLiteral(component, L0.identifier, L0.identifier_Inverse, L0.GUID, guid, GUID.BINDING);
1488         else
1489             graph.claimLiteral(component, L0.identifier, L0.identifier_Inverse, L0.GUID, guid, GUID.BINDING);
1490     }
1491
1492     /**
1493      * Sets a new random unique identifier for the specified entity if it already
1494      * has an identifier. If the entity does not have a previous identifier, nothing
1495      * is done.
1496      *
1497      * @param graph
1498      * @param entity
1499      *            for which the identifier is added
1500      * @return <code>true</code> if the identifier was renewed, <code>false</code>
1501      *         otherwise
1502      * @throws DatabaseException
1503      * @see {@link #claimNewIdentifier(WriteGraph, Resource, boolean)}
1504      */
1505     public static boolean renewIdentifier(WriteGraph graph, Resource entity) throws DatabaseException {
1506         Layer0 L0 = Layer0.getInstance(graph);
1507         Statement stm = graph.getPossibleStatement(entity, L0.identifier);
1508         if (stm != null) {
1509             graph.claimValue(stm.getObject(), GUID.random(), GUID.BINDING);
1510             return true;
1511         }
1512         return false;
1513     }
1514
1515     public static void addMetadataListener(ChangeListener listener) {
1516         SimanticsInternal.getSession().getService(GraphChangeListenerSupport.class).addMetadataListener(listener);
1517     }
1518
1519     public static void removeMetadataListener(ChangeListener listener) {
1520         SimanticsInternal.getSession().getService(GraphChangeListenerSupport.class).removeMetadataListener(listener);
1521     }
1522
1523 }