org.simantics.district.network.ui/src/org/simantics/district/network/ui/function/Functions.java

   1 package org.simantics.district.network.ui.function;
   2
   3 import java.util.ArrayList;
   4 import java.util.Arrays;
   5 import java.util.Collection;
   6 import java.util.Collections;
   7 import java.util.HashMap;
   8 import java.util.HashSet;
   9 import java.util.List;
  10 import java.util.Map;
  11 import java.util.Set;
  12 import java.util.stream.Collectors;
  13
  14 import org.eclipse.jface.dialogs.Dialog;
  15 import org.eclipse.jface.layout.GridDataFactory;
  16 import org.eclipse.swt.SWT;
  17 import org.eclipse.swt.events.SelectionAdapter;
  18 import org.eclipse.swt.events.SelectionEvent;
  19 import org.eclipse.swt.layout.GridData;
  20 import org.eclipse.swt.layout.GridLayout;
  21 import org.eclipse.swt.widgets.Combo;
  22 import org.eclipse.swt.widgets.Composite;
  23 import org.eclipse.swt.widgets.Control;
  24 import org.eclipse.swt.widgets.Group;
  25 import org.eclipse.swt.widgets.Label;
  26 import org.eclipse.swt.widgets.Shell;
  27 import org.eclipse.ui.PlatformUI;
  28 import org.eclipse.ui.dialogs.SelectionStatusDialog;
  29 import org.simantics.NameLabelUtil;
  30 import org.simantics.Simantics;
  31 import org.simantics.browsing.ui.common.modifiers.EnumeratedValue;
  32 import org.simantics.browsing.ui.common.modifiers.Enumeration;
  33 import org.simantics.browsing.ui.graph.impl.GraphEnumerationModifier;
  34 import org.simantics.databoard.Bindings;
  35 import org.simantics.db.ReadGraph;
  36 import org.simantics.db.Resource;
  37 import org.simantics.db.Session;
  38 import org.simantics.db.WriteGraph;
  39 import org.simantics.db.common.request.IndexRoot;
  40 import org.simantics.db.common.request.ObjectsWithType;
  41 import org.simantics.db.common.request.ReadRequest;
  42 import org.simantics.db.common.request.WriteRequest;
  43 import org.simantics.db.exception.DatabaseException;
  44 import org.simantics.db.exception.RuntimeDatabaseException;
  45 import org.simantics.db.exception.ServiceException;
  46 import org.simantics.db.layer0.QueryIndexUtils;
  47 import org.simantics.db.layer0.util.Layer0Utils;
  48 import org.simantics.db.layer0.variable.Variable;
  49 import org.simantics.db.layer0.variable.Variables;
  50 import org.simantics.db.layer0.variable.Variables.Role;
  51 import org.simantics.db.procedure.Procedure;
  52 import org.simantics.district.network.ontology.DistrictNetworkResource;
  53 import org.simantics.layer0.Layer0;
  54 import org.simantics.modeling.ModelingResources;
  55 import org.simantics.modeling.adapters.NewCompositeActionFactory;
  56 import org.simantics.modeling.typicals.TypicalUtil;
  57 import org.simantics.operation.Layer0X;
  58 import org.simantics.scl.compiler.commands.CommandSession;
  59 import org.simantics.scl.compiler.commands.CommandSessionImportEntry;
  60 import org.simantics.scl.compiler.errors.CompilationError;
  61 import org.simantics.scl.osgi.SCLOsgi;
  62 import org.simantics.scl.reflection.annotations.SCLValue;
  63 import org.simantics.scl.runtime.SCLContext;
  64 import org.simantics.scl.runtime.function.Function1;
  65 import org.simantics.scl.runtime.function.FunctionImpl1;
  66 import org.simantics.scl.runtime.reporting.SCLReportingHandler;
  67 import org.simantics.ui.workbench.action.DefaultActions;
  68 import org.simantics.utils.ui.SWTUtils;
  69 import org.slf4j.Logger;
  70 import org.slf4j.LoggerFactory;
  71
  72 public class Functions {
  73
  74     private static final Logger LOGGER = LoggerFactory.getLogger(Functions.class);
  75
  76     private Functions() {
  77     }
  78
  79     private static class HasMappingEnumerationModifier extends GraphEnumerationModifier {
  80
  81         public HasMappingEnumerationModifier(Session session, Resource subject, Resource relation, Enumeration<Resource> enumeration, Resource value) {
  82             super(session, subject, relation, enumeration, value);
  83         }
  84
  85     }
  86
  87     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
  88     public static Object defaultEdgeMappingModifier(ReadGraph graph, Resource resource, final Variable context) throws DatabaseException {
  89         Resource diagram = resolveElement(graph, context);
  90         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
  91         return baseMappingModifier(graph, diagram, DN.EdgeDefaultMapping, DN.Mapping_EdgeMapping, context);
  92     }
  93
  94     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
  95     public static Object defaultVertexMappingModifier(ReadGraph graph, Resource resource, final Variable context) throws DatabaseException {
  96         System.out.println(graph.getURI(resource));
  97         System.out.println(context.getURI(graph));
  98
  99         Resource diagram = resolveElement(graph, context);
 100         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 101         return baseMappingModifier(graph, diagram, DN.VertexDefaultMapping, DN.Mapping_VertexMapping, context);
 102     }
 103
 104     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 105     public static Object mappingModifier(ReadGraph graph, Resource resource, final Variable context) throws DatabaseException {
 106
 107         Resource element = resolveElement(graph, context);
 108         Resource mappingType = resolveMappingType(graph, element);
 109         return baseMappingModifier(graph, element, DistrictNetworkResource.getInstance(graph).HasMapping, mappingType, context);
 110     }
 111
 112     public static Map<String, Resource> getVertexMappings(ReadGraph graph, Resource indexRoot) throws DatabaseException {
 113         Map<String, Resource> second = getNetworkMappingsByType(graph, indexRoot, DistrictNetworkResource.getInstance(graph).Mapping_VertexMapping);
 114         return second;
 115     }
 116
 117     public static Map<String, Resource> getEdgeMappings(ReadGraph graph, Resource indexRoot) throws DatabaseException {
 118         Map<String, Resource> second = getNetworkMappingsByType(graph, indexRoot, DistrictNetworkResource.getInstance(graph).Mapping_EdgeMapping);
 119         return second;
 120     }
 121
 122     public static Map<String, Resource> getCRSs(ReadGraph graph, Resource resource) throws DatabaseException {
 123         Map<String, Resource> result = getNetworkMappingsByType(graph, graph.sync(new IndexRoot(resource)), DistrictNetworkResource.getInstance(graph).SpatialRefSystem);
 124         return result;
 125
 126     }
 127
 128     public static Map<String, Resource> getNetworkMappingsByType(ReadGraph graph, Resource indexRoot, Resource mappingType) throws DatabaseException {
 129         List<Resource> mappings = QueryIndexUtils.searchByType(graph, indexRoot, mappingType);
 130         Map<String, Resource> result = new HashMap<>(mappings.size());
 131         Layer0 L0 = Layer0.getInstance(graph);
 132         mappings.forEach(mapping -> {
 133             try {
 134                 String name = graph.getRelatedValue2(mapping, L0.HasName);
 135                 Resource existing = result.put(name, mapping);
 136                 if (existing != null) {
 137                     LOGGER.warn("Duplicate mapping name! {} {} and existing is {}", name, mapping, existing);
 138                 }
 139             } catch (DatabaseException e) {
 140                 e.printStackTrace();
 141             }
 142         });
 143         return result;
 144     }
 145
 146     private static Object baseMappingModifier(ReadGraph graph, Resource element, Resource property, Resource mappingType, Variable context) throws DatabaseException {
 147         Resource indexRoot = graph.sync(new IndexRoot(element));
 148         List<Resource> mappings = QueryIndexUtils.searchByType(graph, indexRoot, mappingType);
 149         Enumeration<Resource> enums = Enumeration
 150                 .make(mappings.stream().map(m -> createEnumeratedValue(graph, m)).collect(Collectors.toList()));
 151
 152         Resource currentMapping = graph.getSingleObject(element, property);
 153
 154         return new HasMappingEnumerationModifier(Simantics.getSession(), element, property, enums, currentMapping);
 155     }
 156
 157     private static Resource resolveMappingType(ReadGraph graph, Resource element) throws DatabaseException {
 158         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 159         if (graph.isInstanceOf(element, DN.Edge))
 160             return DN.Mapping_EdgeMapping;
 161         else if (graph.isInstanceOf(element, DN.Vertex))
 162             return DN.Mapping_VertexMapping;
 163         throw new IllegalStateException("No mapping type found for element " + element + " : " + graph.getPossibleURI(element));
 164     }
 165
 166     private static Resource resolveElement(ReadGraph graph, Variable variable) throws DatabaseException {
 167         Role role = variable.getPossibleRole(graph);
 168         if (role.equals(Role.PROPERTY))
 169             return resolveElement(graph, variable.getParent(graph));
 170         else
 171             return variable.getRepresents(graph);
 172     }
 173
 174     private static EnumeratedValue<Resource> createEnumeratedValue(ReadGraph graph, Resource resource) {
 175         try {
 176             String label = NameLabelUtil.modalName(graph, resource);
 177             return new EnumeratedValue<Resource>(label, resource);
 178         } catch (DatabaseException e) {
 179             throw new RuntimeDatabaseException(e);
 180         }
 181     }
 182
 183     @SCLValue(type = "ReadGraph -> Resource -> a -> b")
 184     public static Object enumerationValues(ReadGraph graph, Resource resource, Object context) throws DatabaseException {
 185         Variable var = (Variable) context;
 186         System.out.println(graph.getURI(resource));
 187         System.out.println(var.getURI(graph));
 188         return Collections.emptyList();
 189     }
 190
 191     @SCLValue(type = "ReadGraph -> Resource -> a -> b")
 192     public static Object convertToValue(ReadGraph graph, Resource resource, Object context) throws DatabaseException {
 193         Layer0 L0 = Layer0.getInstance(graph);
 194         String label = graph.getPossibleRelatedValue2(resource, L0.HasLabel, Bindings.STRING);
 195         if (label == null)
 196             label = graph.getRelatedValue(resource, L0.HasName, Bindings.STRING);
 197         return label;
 198     }
 199
 200
 201     @SCLValue(type = "Resource -> String -> Resource -> Resource")
 202     public static Resource compositeInstantiator(final Resource compositeType, final String defaultName, final Resource target) throws DatabaseException {
 203
 204         return TypicalUtil.syncExec(procedure -> {
 205             if (!SWTUtils.asyncExec(PlatformUI.getWorkbench().getDisplay(), () -> {
 206                 try {
 207                     queryInitialValuesAndCreateComposite(compositeType, target, defaultName, procedure);
 208                 } catch (Throwable t) {
 209                     procedure.exception(t);
 210                 }
 211             })) {
 212                 procedure.execute(null);
 213             }
 214         });
 215     }
 216
 217     private static class DefaultMappingsDialog extends SelectionStatusDialog {
 218
 219         private Combo vertexMappingCombo;
 220         private Combo edgeMappingCombo;
 221         private Combo crsCombo;
 222         private Composite composite;
 223
 224         private Resource configuration;
 225         private Map<String, Resource> vertexMappings = new HashMap<>();
 226         private Map<String, Resource> edgeMappings = new HashMap<>();
 227         private Map<String, Resource> composites = new HashMap<>();
 228         private Map<String, Resource> crss = new HashMap<>();
 229
 230         private Resource defaultVertexMapping;
 231         private Resource defaultEdgeMapping;
 232         private Resource defaultCRS;
 233
 234         private Combo compositeMappingCombo;
 235         private Combo componentMappingCombo;
 236
 237         protected DefaultMappingsDialog(Shell parentShell, Resource configuration) {
 238             super(parentShell);
 239             this.configuration = configuration;
 240             setTitle("Select mappings for new DN diagram");
 241         }
 242
 243         public Resource getDefaultVertexMapping() {
 244             return defaultVertexMapping;
 245         }
 246
 247         public Resource getDefaultEdgeMapping() {
 248             return defaultEdgeMapping;
 249         }
 250
 251         @Override
 252         protected Control createDialogArea(Composite parent) {
 253             composite = (Composite) super.createDialogArea(parent);
 254
 255             createMappingsGroup(composite);
 256             createExistingCompositeGroup(composite);
 257             createCRSSettingsGroup(composite);
 258
 259             // compute default values
 260             Simantics.getSession().asyncRequest(new ReadRequest() {
 261
 262                 @Override
 263                 public void run(ReadGraph graph) throws DatabaseException {
 264                     Resource indexRoot = graph.sync(new IndexRoot(configuration));
 265                     vertexMappings = getVertexMappings(graph, indexRoot);
 266                     edgeMappings = getEdgeMappings(graph, indexRoot);
 267
 268                     composites = getComposites(graph, configuration);
 269
 270                     crss = getCRSs(graph, configuration);
 271
 272                     composite.getDisplay().asyncExec(() -> {
 273
 274                         vertexMappingCombo.setItems(vertexMappings.keySet().toArray(new String[vertexMappings.size()]));
 275                         edgeMappingCombo.setItems(edgeMappings.keySet().toArray(new String[edgeMappings.size()]));
 276
 277                         crsCombo.setItems(crss.keySet().toArray(new String[crss.size()]));
 278
 279                         compositeMappingCombo.setItems(composites.keySet().toArray(new String[composites.size()]));
 280                         vertexMappingCombo.select(0);
 281                         edgeMappingCombo.select(0);
 282
 283                         crsCombo.select(0);
 284
 285                         if (!composites.isEmpty())
 286                             compositeMappingCombo.select(0);
 287                     });
 288
 289                 }
 290             });
 291             return composite;
 292         }
 293
 294         protected Map<String, Resource> getComposites(ReadGraph graph, Resource element) throws DatabaseException {
 295             List<Resource> nonDistrictComposites = composites.values().stream().filter(comp -> {
 296                 try {
 297                     return !graph.isInstanceOf(comp, DistrictNetworkResource.getInstance(graph).Composite);
 298                 } catch (ServiceException e1) {
 299                     LOGGER.error("Could not check if composite " + comp + " is instanceOf DistrictNetwork.composite");
 300                     return false;
 301                 }
 302             }).collect(Collectors.toList());
 303             Map<String, Resource> result = new HashMap<>(nonDistrictComposites.size());
 304             Layer0 L0 = Layer0.getInstance(graph);
 305             nonDistrictComposites.forEach(mapping -> {
 306                 try {
 307                     String name = graph.getRelatedValue2(mapping, L0.HasName);
 308                     result.put(name, mapping);
 309                 } catch (DatabaseException e) {
 310                     LOGGER.error("Could not read name of " + mapping, e);
 311                 }
 312             });
 313             return result;
 314         }
 315
 316         private void createMappingsGroup(Composite parent) {
 317             Group group= new Group(parent, SWT.NONE);
 318             group.setFont(parent.getFont());
 319             group.setText("Default mappings");
 320             GridDataFactory.fillDefaults().grab(true, false).applyTo(group);
 321             group.setLayout(new GridLayout(1, false));
 322
 323             Composite cmposite = new Composite(group, SWT.NONE);
 324             cmposite.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
 325             cmposite.setLayout(new GridLayout(2, false));
 326
 327             Label vertexMappingLabel = new Label(cmposite, SWT.NONE);
 328             vertexMappingLabel.setText("Default vertex mapping");
 329
 330             vertexMappingCombo = new Combo(cmposite, SWT.READ_ONLY | SWT.BORDER);
 331             GridDataFactory.fillDefaults().grab(true, false).applyTo(vertexMappingCombo);
 332
 333             Label edgeMappingLabel = new Label(cmposite, SWT.NONE);
 334             edgeMappingLabel.setText("Default edge mapping");
 335
 336             edgeMappingCombo = new Combo(cmposite, SWT.READ_ONLY | SWT.BORDER);
 337             GridDataFactory.fillDefaults().grab(true, false).applyTo(edgeMappingCombo);
 338         }
 339
 340         private void createExistingCompositeGroup(Composite parent) {
 341             Group group= new Group(parent, SWT.NONE);
 342             group.setFont(parent.getFont());
 343             group.setText("Mapped composite");
 344             GridDataFactory.fillDefaults().grab(true, false).applyTo(group);
 345             group.setLayout(new GridLayout(1, false));
 346
 347             Composite cmposite = new Composite(group, SWT.NONE);
 348             cmposite.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
 349             cmposite.setLayout(new GridLayout(2, false));
 350
 351             Label compositeMappingLabel = new Label(cmposite, SWT.NONE);
 352             compositeMappingLabel.setText("Select composite");
 353
 354             compositeMappingCombo = new Combo(cmposite, SWT.READ_ONLY | SWT.BORDER);
 355             GridDataFactory.fillDefaults().grab(true, false).applyTo(compositeMappingCombo);
 356             compositeMappingCombo.addSelectionListener(new SelectionAdapter() {
 357
 358                 @Override
 359                 public void widgetSelected(SelectionEvent e) {
 360                     super.widgetSelected(e);
 361                     recalculateMappapleComponents();
 362                 }
 363             });
 364
 365             Label compojnentMappingLabel = new Label(cmposite, SWT.NONE);
 366             compojnentMappingLabel.setText("Select component");
 367
 368             componentMappingCombo = new Combo(cmposite, SWT.READ_ONLY | SWT.BORDER);
 369             GridDataFactory.fillDefaults().grab(true, false).applyTo(componentMappingCombo);
 370         }
 371
 372         protected void recalculateMappapleComponents() {
 373             Simantics.getSession().asyncRequest(new ReadRequest() {
 374
 375                 @Override
 376                 public void run(ReadGraph graph) throws DatabaseException {
 377
 378
 379                     composite.getDisplay().asyncExec(() -> {
 380
 381                     });
 382                 }
 383             });
 384         }
 385
 386         private void createCRSSettingsGroup(Composite parent) {
 387             Group group= new Group(parent, SWT.NONE);
 388             group.setFont(parent.getFont());
 389             group.setText("CRS settings");
 390             GridDataFactory.fillDefaults().grab(true, false).applyTo(group);
 391             group.setLayout(new GridLayout(1, false));
 392
 393             Composite cmposite = new Composite(group, SWT.NONE);
 394             cmposite.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
 395             cmposite.setLayout(new GridLayout(2, false));
 396
 397             Label vertexMappingLabel = new Label(cmposite, SWT.NONE);
 398             vertexMappingLabel.setText("Default CRS");
 399
 400             crsCombo = new Combo(cmposite, SWT.READ_ONLY | SWT.BORDER);
 401             GridData textData = new GridData(SWT.FILL, SWT.CENTER, true, false);
 402             crsCombo.setLayoutData(textData);
 403         }
 404
 405
 406         @Override
 407         protected void computeResult() {
 408             defaultVertexMapping = vertexMappings.get(vertexMappingCombo.getItem(vertexMappingCombo.getSelectionIndex()));
 409             defaultEdgeMapping = edgeMappings.get(edgeMappingCombo.getItem(edgeMappingCombo.getSelectionIndex()));
 410             defaultCRS = crss.get(crsCombo.getItem(crsCombo.getSelectionIndex()));
 411         }
 412
 413         public Resource getCRS() {
 414             return defaultCRS;
 415         }
 416
 417     }
 418
 419     private static void queryInitialValuesAndCreateComposite(final Resource compositeType, final Resource target,
 420             String defaultName, final Procedure<Resource> procedure) {
 421         DefaultMappingsDialog dialog = new DefaultMappingsDialog(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), target);
 422
 423         if (dialog.open() != Dialog.OK) {
 424             procedure.execute(null);
 425             return;
 426         }
 427         Simantics.getSession().asyncRequest(
 428                 NewCompositeActionFactory.createCompositeRequest(target, defaultName, compositeType),
 429                 new Procedure<Resource>() {
 430                     @Override
 431                     public void execute(Resource composite) {
 432                         Simantics.getSession().asyncRequest(new WriteRequest() {
 433
 434                             @Override
 435                             public void perform(WriteGraph graph) throws DatabaseException {
 436                                 DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 437                                 Resource diagram = graph.getSingleObject(composite, ModelingResources.getInstance(graph).CompositeToDiagram);
 438                                 graph.claim(diagram, DN.EdgeDefaultMapping, dialog.getDefaultEdgeMapping());
 439                                 graph.claim(diagram, DN.VertexDefaultMapping, dialog.getDefaultVertexMapping());
 440                                 graph.claim(diagram, DN.HasSpatialRefSystem, dialog.getCRS());
 441
 442                                 // Generated name prefix from composite name
 443                                 String compositeName = graph.getRelatedValue2(composite, Layer0.getInstance(graph).HasName, Bindings.STRING);
 444                                 graph.claimLiteral(diagram, Layer0X.getInstance(graph).HasGeneratedNamePrefix, "N" + compositeName.substring(compositeName.length() - 1, compositeName.length()));
 445                             }
 446                         });
 447                         DefaultActions.asyncPerformDefaultAction(Simantics.getSession(), composite, false, false, true);
 448                         procedure.execute(composite);
 449                     }
 450
 451                     @Override
 452                     public void exception(Throwable t) {
 453                         LOGGER.error("Failed to create composite, see exception for details.", t);
 454                         procedure.exception(t);
 455                     }
 456                 });
 457     }
 458
 459     public static Collection<Resource> getDistrictDiagrams(ReadGraph graph) throws DatabaseException {
 460         Layer0 L0 = Layer0.getInstance(graph);
 461         Collection<Resource> indexRoots = graph.sync(new ObjectsWithType(Simantics.getProjectResource(), L0.ConsistsOf, L0.IndexRoot));
 462         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 463         Set<Resource> results = new HashSet<>();
 464         for (Resource indexRoot : indexRoots) {
 465             Collection<Resource> diagrams = QueryIndexUtils.searchByType(graph, indexRoot, DN.Diagram);
 466             results.addAll(diagrams);
 467         }
 468         return results;
 469     }
 470
 471     private static List<String> listInstanceNames(ReadGraph graph, Variable context, Resource type) throws DatabaseException {
 472         Resource indexRoot = Variables.getIndexRoot(graph, context);
 473         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 474         List<Resource> properties = QueryIndexUtils.searchByType(graph, indexRoot, DN.Vertex_ScaleProperty);
 475         return properties.stream()
 476                 .map(m -> createEnumeratedValue(graph, m))
 477                 .map(EnumeratedValue::getName)
 478                 .collect(Collectors.toList());
 479     }
 480
 481     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 482     public static Object edgeThicknessPropertyEnumerationValues(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 483         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 484         return listInstanceNames(graph, context, DN.Edge_ThicknessProperty);
 485     }
 486
 487     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 488     public static Object arrowLengthPropertyEnumerationValues(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 489         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 490         return listInstanceNames(graph, context, DN.Edge_ArrowLengthProperty);
 491     }
 492
 493     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 494     public static Object nodeScalePropertyEnumerationValues(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 495         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 496         return listInstanceNames(graph, context, DN.Vertex_ScaleProperty);
 497     }
 498
 499     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 500     public static Object edgeThicknessPropertyModifier(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 501         Resource diagram = resolveElement(graph, context);
 502         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 503         return baseMappingModifier(graph, diagram, DN.Diagram_edgeThicknessProperty, DN.Edge_ThicknessProperty, context);
 504     }
 505
 506     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 507     public static Object arrowLengthPropertyModifier(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 508         Resource diagram = resolveElement(graph, context);
 509         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 510         return baseMappingModifier(graph, diagram, DN.Diagram_arrowLengthProperty, DN.Edge_ArrowLengthProperty, context);
 511     }
 512
 513     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 514     public static Object nodeScalePropertyModifier(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 515         Resource diagram = resolveElement(graph, context);
 516         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
 517         return baseMappingModifier(graph, diagram, DN.Diagram_nodeScaleProperty, DN.Vertex_ScaleProperty, context);
 518     }
 519
 520     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 521     public static Function1<Resource, Double> hasDiameterValue(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 522         return directPropertyValueFunction(DistrictNetworkResource.getInstance(graph).Edge_HasDiameter, 0);
 523     }
 524
 525     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 526     public static Function1<Resource, Double> hasNominalMassFlowValue(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 527         return directPropertyValueFunction(DistrictNetworkResource.getInstance(graph).Edge_HasNominalMassFlow, 0);
 528     }
 529
 530     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 531     public static Function1<Resource, Double> hasNominalSupplyPressure(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 532         return directPropertyValueFunction(DistrictNetworkResource.getInstance(graph).Vertex_HasSupplyPressure, 0);
 533     }
 534
 535     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 536     public static Function1<Resource, Double> hasElevation(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 537         return directPropertyValueFunction(DistrictNetworkResource.getInstance(graph).Vertex_HasElevation, 0);
 538     }
 539
 540     private static final Function1<Resource, Double> ONE = new FunctionImpl1<Resource, Double>() {
 541         private final Double ONE = 1.0;
 542         @Override
 543         public Double apply(Resource edge) {
 544             return ONE;
 545         }
 546         @Override
 547         public String toString() {
 548             return "1";
 549         }
 550     };
 551
 552     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 553     public static Function1<Resource, Double> constantOne(ReadGraph graph, Resource resource, Variable context) throws DatabaseException {
 554         return ONE;
 555     }
 556
 557     private static Function1<Resource, Double> directPropertyValueFunction(Resource property, double defaultValue) throws DatabaseException {
 558         Double def = defaultValue;
 559         return new FunctionImpl1<Resource, Double>() {
 560             @Override
 561             public Double apply(Resource edge) {
 562                 ReadGraph graph = (ReadGraph) SCLContext.getCurrent().get("graph");
 563                 try {
 564                     Double d = graph.getPossibleRelatedValue(edge, property, Bindings.DOUBLE);
 565                     return d != null ? d : def;
 566                 } catch (DatabaseException e) {
 567                     LOGGER.error("Failed to evaluate property value", e);
 568                     return def;
 569                 }
 570             }
 571         };
 572     }
 573
 574     private static class RangeValidator implements Function1<String, String> {
 575         private double min;
 576         private double max;
 577         public RangeValidator(double min, double max) {
 578             this.min = min;
 579             this.max = max;
 580         }
 581         @Override
 582         public String apply(String s) {
 583             try {
 584                 double d = Double.parseDouble(s);
 585                 if (d < min)
 586                     return "Value must be greater than or equal to " + min;
 587                 if (d > max)
 588                     return "Value must be less than or equal to " + max;
 589                 return null;
 590             } catch (NumberFormatException e) {
 591                 return "Specified value is not a number";
 592             }
 593         }
 594     }
 595
 596     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 597     public static Object hueValidator(ReadGraph graph, Resource r, Variable context) throws DatabaseException {
 598         return new RangeValidator(0, 360);
 599     }
 600
 601     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 602     public static Object saturationValidator(ReadGraph graph, Resource r, Variable context) throws DatabaseException {
 603         return new RangeValidator(0, 100);
 604     }
 605
 606     @SCLValue(type = "ReadGraph -> Resource -> Variable -> b")
 607     public static Object brightnessValidator(ReadGraph graph, Resource r, Variable context) throws DatabaseException {
 608         String importEntry = null;
 609         Resource root = Variables.getPossibleIndexRoot(graph, context);
 610         if (root != null) {
 611             Resource sclmain = Layer0Utils.getPossibleChild(graph, root, "SCLMain");
 612             if (sclmain != null) {
 613                 importEntry = graph.getPossibleURI(sclmain);
 614             }
 615         }
 616         SCLContext ctx = SCLContext.getCurrent();
 617         Object oldGraph = ctx.put("graph", graph);
 618         try {
 619             return new BrightnessExpressionValidator(
 620                     importEntry != null
 621                     ? Arrays.asList(importEntry)
 622                     : Collections.emptyList());
 623         } finally {
 624             ctx.put("graph", oldGraph);
 625         }
 626     }
 627
 628     private static class BrightnessExpressionValidator implements Function1<String, String> {
 629         private CommandSession session;
 630
 631         public BrightnessExpressionValidator(List<String> importEntries) {
 632             this.session = new CommandSession(SCLOsgi.MODULE_REPOSITORY, SCLReportingHandler.DEFAULT);
 633             this.session.setImportEntries(imports(importEntries));
 634         }
 635
 636         private ArrayList<CommandSessionImportEntry> imports(List<String> entries) {
 637             ArrayList<CommandSessionImportEntry> result = new ArrayList<>();
 638             entries.stream().map(CommandSessionImportEntry::new).forEach(result::add);
 639             if (entries.isEmpty())
 640                 result.add(new CommandSessionImportEntry("Simantics/District/SCLMain"));
 641             return result;
 642         }
 643
 644         @Override
 645         public String apply(String s) {
 646             s = s.trim();
 647             if (!s.startsWith("="))
 648                 return "Expression expected, must start with '='";
 649             CompilationError[] errors = session.validate(s.substring(1));
 650             if(errors.length == 0)
 651                 return null;
 652             return errors[0].description;
 653         }
 654     }
 655
 656 }