bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/RouteGraphUtils.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2016 Association for Decentralized Information Management
   3  * in 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  *     Semantum Oy - refactoring
  12  *******************************************************************************/
  13 package org.simantics.diagram.adapter;
  14
  15 import java.awt.BasicStroke;
  16 import java.awt.Color;
  17 import java.awt.Shape;
  18 import java.awt.Stroke;
  19 import java.awt.geom.AffineTransform;
  20 import java.awt.geom.Rectangle2D;
  21 import java.util.Collection;
  22 import java.util.Collections;
  23 import java.util.Map;
  24 import java.util.Set;
  25
  26 import org.simantics.databoard.Bindings;
  27 import org.simantics.db.ReadGraph;
  28 import org.simantics.db.Resource;
  29 import org.simantics.db.Session;
  30 import org.simantics.db.Statement;
  31 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
  32 import org.simantics.db.common.request.ResourceRead2;
  33 import org.simantics.db.common.request.UnaryRead;
  34 import org.simantics.db.common.utils.NameUtils;
  35 import org.simantics.db.exception.DatabaseException;
  36 import org.simantics.diagram.connection.ConnectionVisuals;
  37 import org.simantics.diagram.connection.RouteGraph;
  38 import org.simantics.diagram.connection.RouteGraphConnectionClass;
  39 import org.simantics.diagram.connection.RouteLine;
  40 import org.simantics.diagram.connection.RouteNode;
  41 import org.simantics.diagram.connection.RouteTerminal;
  42 import org.simantics.diagram.connection.RouteTerminalPosition;
  43 import org.simantics.diagram.connection.rendering.BasicConnectionStyle;
  44 import org.simantics.diagram.connection.rendering.ConnectionStyle;
  45 import org.simantics.diagram.connection.rendering.StyledRouteGraphRenderer;
  46 import org.simantics.diagram.connection.rendering.arrows.ArrowLineEndStyle;
  47 import org.simantics.diagram.connection.rendering.arrows.ILineEndStyle;
  48 import org.simantics.diagram.connection.rendering.arrows.PlainLineEndStyle;
  49 import org.simantics.diagram.content.EdgeResource;
  50 import org.simantics.diagram.content.ResourceTerminal;
  51 import org.simantics.diagram.content.TerminalMap;
  52 import org.simantics.diagram.query.DiagramRequests;
  53 import org.simantics.diagram.stubs.DiagramResource;
  54 import org.simantics.diagram.stubs.G2DResource;
  55 import org.simantics.diagram.synchronization.graph.DiagramGraphUtil;
  56 import org.simantics.diagram.synchronization.graph.RouteGraphConnection;
  57 import org.simantics.g2d.canvas.ICanvasContext;
  58 import org.simantics.g2d.canvas.impl.CanvasContext;
  59 import org.simantics.g2d.diagram.IDiagram;
  60 import org.simantics.g2d.diagram.handler.DataElementMap;
  61 import org.simantics.g2d.diagram.handler.Topology.Connection;
  62 import org.simantics.g2d.diagram.handler.Topology.Terminal;
  63 import org.simantics.g2d.diagram.impl.ElementDiagram;
  64 import org.simantics.g2d.element.ElementUtils;
  65 import org.simantics.g2d.element.IElement;
  66 import org.simantics.g2d.element.handler.EdgeVisuals.EdgeEnd;
  67 import org.simantics.g2d.element.handler.TerminalLayout;
  68 import org.simantics.g2d.elementclass.FlagClass.Type;
  69 import org.simantics.layer0.Layer0;
  70 import org.simantics.scenegraph.g2d.nodes.connection.RouteGraphChangeEvent;
  71 import org.simantics.scenegraph.utils.GeometryUtils;
  72 import org.simantics.structural.stubs.StructuralResource2;
  73 import org.simantics.structural2.modelingRules.CPTerminal;
  74 import org.simantics.structural2.modelingRules.IAttachmentRelationMap;
  75 import org.simantics.structural2.modelingRules.IModelingRules;
  76 import org.simantics.utils.threads.CurrentThread;
  77 import org.slf4j.Logger;
  78 import org.slf4j.LoggerFactory;
  79
  80 import gnu.trove.map.hash.THashMap;
  81 import gnu.trove.set.hash.THashSet;
  82
  83 public class RouteGraphUtils {
  84
  85     private static final Logger LOGGER = LoggerFactory.getLogger(RouteGraph.class);
  86     public static boolean DEBUG = false;
  87
  88     public static final ILineEndStyle HEAD  = new ArrowLineEndStyle("fill 2 1 0");
  89     public static final ILineEndStyle TAIL  = PlainLineEndStyle.INSTANCE;
  90
  91     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection) throws DatabaseException {
  92         ICanvasContext canvas = new CanvasContext(CurrentThread.getThreadAccess());
  93         IDiagram diagram = new ElementDiagram(canvas);
  94         return load(graph, diagramRuntime, connection, canvas, diagram);
  95     }
  96
  97     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection, ICanvasContext canvas, IDiagram diagram) throws DatabaseException {
  98         Layer0 L0 = Layer0.getInstance(graph);
  99         Resource diagramResource = graph.getPossibleObject(connection, L0.PartOf);
 100         IModelingRules modelingRules = graph.syncRequest(DiagramRequests.getModelingRules(diagramResource, null), TransientCacheListener.<IModelingRules>instance());
 101         return load(graph, diagramRuntime, connection, canvas, diagram, null, modelingRules, null);
 102     }
 103
 104     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection, ICanvasContext canvas, IDiagram diagram, IElement element, IModelingRules modelingRules, Set<BackendConnection> backendConnections) throws DatabaseException {
 105
 106         DiagramResource DIA = DiagramResource.getInstance(graph);
 107         StructuralResource2 STR = StructuralResource2.getInstance(graph);
 108
 109         RouteGraph rg = new RouteGraph();
 110
 111         // Default capacity should be enough for common cases.
 112         Set<EdgeResource> links = new THashSet<EdgeResource>();
 113         Map<Object, RouteNode> nodeByData = new THashMap<Object, RouteNode>();
 114
 115         // Load all route graph interior RouteNodes: route lines and points
 116         for (Resource interiorNode : graph.getObjects(connection, DIA.HasInteriorRouteNode)) {
 117             if (graph.isInstanceOf(interiorNode, DIA.RouteLine)) {
 118                 Boolean isHorizontal = graph.getRelatedValue(interiorNode, DIA.IsHorizontal, Bindings.BOOLEAN);
 119                 Double position = graph.getRelatedValue(interiorNode, DIA.HasPosition, Bindings.DOUBLE);
 120                 RouteLine line = rg.addLine(isHorizontal, position);
 121                 line.setData( RouteGraphConnection.serialize(graph, interiorNode) );
 122
 123                 nodeByData.put( interiorNode, line );
 124
 125                 for (Resource connectedTo : graph.getObjects(interiorNode, DIA.AreConnected)) {
 126                     links.add( new EdgeResource(interiorNode, connectedTo) );
 127                 }
 128             } else if (graph.isInstanceOf(interiorNode, DIA.RoutePoint)) {
 129                 // Not supported yet. Ignore.
 130             }
 131         }
 132
 133         Rectangle2D bounds = new Rectangle2D.Double();
 134         Map<Resource, Resource> connectorToModeledAttachment = null;
 135
 136         // Primarily the loader will believe what modeling rules say about
 137         // connector attachment relations.
 138         //
 139         // If modeling rules decide nothing, then we simply believe what the
 140         // the attachment relations in the graph say.
 141         //
 142         // Special case 1: connection with two (2) terminals
 143         // If the attachment of one of two terminals is decided by modeling
 144         // rules, the other attachment shall be the opposite of the decided
 145         // attachment (see forcedAttachmentRelation below).
 146         //
 147         // Special case 2: connected to a flag
 148         // If the attached element is a flag and modeling rules say nothing
 149         // about it, believe the direction stated by the flag type.
 150
 151         Collection<Statement> toConnectorStatements = graph.getStatements(connection, DIA.HasConnector);
 152         int terminalCount = 0;
 153
 154         // See if modeling rules judge any of the connection terminal attachments.
 155         if (modelingRules != null) {
 156             for (Statement toConnector : toConnectorStatements) {
 157                 Resource connector = toConnector.getObject();
 158
 159                 Statement terminalStm = findTerminalStatement(graph, connection, connector, STR);
 160                 if (terminalStm == null)
 161                     // Ignore broken connector: attached to the connection but not to any terminal.
 162                     continue;
 163
 164                 Resource terminalElement = terminalStm.getObject();
 165                 Resource connectionRelation = graph.getPossibleInverse(terminalStm.getPredicate());
 166                 if (connectionRelation == null)
 167                     continue;
 168
 169                 ++terminalCount;
 170
 171                 IAttachmentRelationMap map = modelingRules.getAttachmentRelations(graph, connection);
 172                 Resource attachment = map.get(graph, new CPTerminal(terminalElement, connectionRelation));
 173                 if (attachment != null) {
 174                     // Primary: believe modeling rules
 175                     if (connectorToModeledAttachment == null)
 176                         connectorToModeledAttachment = new THashMap<Resource, Resource>(toConnectorStatements.size());
 177                     connectorToModeledAttachment.put(connector, attachment);
 178                     if (DEBUG)
 179                         LOGGER.debug("modeling rules decided attachment: " + NameUtils.getSafeName(graph, attachment, true) + " for (" + NameUtils.toString(graph, toConnector, true) + ") & (" + NameUtils.toString(graph, terminalStm, true) + ")");
 180                 } else if (graph.isInstanceOf(terminalElement, DIA.Flag)) {
 181                     // Secondary: believe flag type
 182                     attachment = resolveFlagAttachment(graph, connection, terminalElement, modelingRules, DIA);
 183                     if (attachment != null) {
 184                         if (connectorToModeledAttachment == null)
 185                             connectorToModeledAttachment = new THashMap<Resource, Resource>(toConnectorStatements.size());
 186                         connectorToModeledAttachment.put(connector, attachment);
 187                         if (DEBUG)
 188                             LOGGER.debug("flag type decided attachment: " + NameUtils.getSafeName(graph, attachment, true) + " for (" + NameUtils.toString(graph, toConnector, true) + ") & (" + NameUtils.toString(graph, terminalStm, true) + ")");
 189                     }
 190                 }
 191             }
 192         }
 193
 194         if (connectorToModeledAttachment == null)
 195             connectorToModeledAttachment = Collections.emptyMap();
 196
 197         Resource forcedAttachmentRelation = null;
 198         if (terminalCount == 2 && connectorToModeledAttachment.size() == 1) {
 199             forcedAttachmentRelation = getInverseAttachment(graph, connectorToModeledAttachment.values().iterator().next(), DIA);
 200             if (DEBUG)
 201                 LOGGER.debug("set forced attachment: " + NameUtils.getSafeLabel(graph, forcedAttachmentRelation));
 202         }
 203
 204         Resource connectionType = graph.getPossibleObject(connection, STR.HasConnectionType);
 205         DataElementMap diagramDataElementMap = diagram.getDiagramClass().getSingleItem(DataElementMap.class);
 206
 207         // Load all node terminal connections as RouteTerminals
 208         for (Statement toConnector : toConnectorStatements) {
 209             Resource connector = toConnector.getObject();
 210             Resource attachmentRelation = toConnector.getPredicate();
 211             if (DEBUG)
 212                 LOGGER.debug("original attachment relation: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 213
 214             Statement terminalStm = findTerminalStatement(graph, connection, connector, STR);
 215             if (terminalStm == null)
 216                 // Ignore broken connector: attached to the connection but not to any terminal.
 217                 continue;
 218
 219             Resource terminalElement = terminalStm.getObject();
 220             Resource terminalElementType = graph.getPossibleType(terminalElement, DIA.Element);
 221             if (terminalElementType == null)
 222                 // Ignore non-element terminal elements
 223                 continue;
 224
 225             Resource connectionRelation = graph.getPossibleInverse(terminalStm.getPredicate());
 226             if (connectionRelation == null)
 227                 continue;
 228
 229             // Discover node and terminal this connector is connected to.
 230             TerminalMap terminals = graph.syncRequest(DiagramRequests.elementTypeTerminals(terminalElementType),
 231                     TransientCacheListener.<TerminalMap>instance());
 232             Resource terminal = terminals.getTerminal(connectionRelation);
 233             if (terminal == null) {
 234                 System.err.println(
 235                         "RouteGraphUtils: Could not find terminal for connection point "
 236                         + NameUtils.getSafeName(graph, connectionRelation, true)
 237                         + " in element "
 238                         + NameUtils.getSafeName(graph, terminalElement, true));
 239                 continue;
 240             }
 241
 242             double[] position = graph.getRelatedValue(connector, DIA.HasRelativeLocation, Bindings.DOUBLE_ARRAY);
 243             if (position.length != 2)
 244                 position = new double[] { 0, 0 };
 245
 246             AffineTransform terminalTr = DiagramGraphUtil.getDynamicWorldTransform(graph, diagramRuntime, terminalElement);
 247             final AffineTransform terminalElementTransform = new AffineTransform(terminalTr);
 248
 249             if (DEBUG) {
 250                 LOGGER.debug("terminalStm: " + NameUtils.toString(graph, terminalStm));
 251                 LOGGER.debug("terminal: " + NameUtils.getURIOrSafeNameInternal(graph, terminalStm.getPredicate()));
 252                 LOGGER.debug("terminalElement: " + NameUtils.getURIOrSafeNameInternal(graph, terminalElement) + " : " + NameUtils.getURIOrSafeNameInternal(graph, terminalElementType));
 253                 LOGGER.debug("terminalElementTr: " + terminalTr);
 254             }
 255
 256             double x = terminalTr.getTranslateX();
 257             double y = terminalTr.getTranslateY();
 258             double minx = x-1, miny = y-1, maxx = x+1, maxy = y+1;
 259             int direction = 0x0;
 260
 261             // Use modelingRules to ascertain the proper attachmentRelation
 262             // for this terminal connection, if available.
 263             Resource att = connectorToModeledAttachment.get(connector);
 264             if (att != null) {
 265                 attachmentRelation = att;
 266                 if (DEBUG)
 267                     LOGGER.debug("modeling rules attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 268             } else if (forcedAttachmentRelation != null) {
 269                 attachmentRelation = forcedAttachmentRelation;
 270                 if (DEBUG)
 271                     LOGGER.debug("forced rules attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 272             }
 273             if (DEBUG)
 274                 LOGGER.debug("decided attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 275
 276             // Get element bounds to decide allowed terminal direction(s)
 277             IElement te = graph.syncRequest(DiagramRequests.getElement(canvas, diagram, terminalElement, null));
 278             ElementUtils.getElementBounds(te, bounds);
 279             {
 280                 Shape shp = org.simantics.g2d.utils.GeometryUtils.transformShape(bounds, terminalTr);
 281                 bounds.setFrame(shp.getBounds2D());
 282             }
 283
 284             // Expand bounds by 2mm to make the connections enter the terminals
 285             // at a straight angle and from a distance instead of coming in
 286             // "horizontally".
 287             GeometryUtils.expandRectangle(bounds, 2);
 288             minx = bounds.getMinX();
 289             miny = bounds.getMinY();
 290             maxx = bounds.getMaxX();
 291             maxy = bounds.getMaxY();
 292
 293             final ResourceTerminal rt = new ResourceTerminal(terminal);
 294             final TerminalLayout tl = te.getElementClass().getSingleItem(TerminalLayout.class);
 295             AffineTransform terminalPos = tl.getTerminalPosition(element, rt);
 296
 297             if (terminalPos != null) {
 298                 terminalTr.concatenate(terminalPos);
 299                 x = terminalTr.getTranslateX();
 300                 y = terminalTr.getTranslateY();
 301                 if (DEBUG)
 302                     LOGGER.debug("terminalPos/Tr: " + terminalPos + ", " + terminalTr);
 303             }
 304
 305             Integer allowedDirections = graph.getPossibleRelatedValue(terminal, DIA.Terminal_AllowedDirections, Bindings.INTEGER);
 306             if (allowedDirections != null) {
 307                 direction |= allowedDirections;
 308                 direction = rotateDirection(direction, terminalTr);
 309             } else {
 310                 direction |= RouteGraphConnectionClass.shortestDirectionOutOfBounds(x, y, bounds);
 311             }
 312             //LOGGER.debug("DIR(" + x + ", " + y + ", " + bounds + "): " + Integer.toHexString(direction));
 313
 314             if (backendConnections != null) {
 315                 backendConnections.add(
 316                         new BackendConnection(
 317                                 toEdgeEnd(graph, attachmentRelation, EdgeEnd.Begin, DIA),
 318                                 terminalElement,
 319                                 terminal)
 320                         );
 321             }
 322
 323             if (direction == 0)
 324                 // Accept any horizontal/vertical direction if nothing is defined
 325                 direction = 0xf;
 326
 327             if (graph.<Boolean>getRelatedValue(connector, DIA.Connector_straight, Bindings.BOOLEAN))
 328                 direction |= RouteTerminal.DIR_DIRECT;
 329             // FIXME: routegraph crashes if this is done for all terminals regardless of the amount of terminals.
 330
 331             if (DEBUG)
 332                 LOGGER.debug("load line style: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 333             ILineEndStyle endStyle = loadLineEndStyle(graph, attachmentRelation, connectionType, TAIL);
 334
 335             RouteTerminal routeTerminal = rg.addTerminal(x, y, minx, miny, maxx, maxy, direction, endStyle,
 336                     new RouteTerminalPositionImpl(diagram, diagramDataElementMap, terminalElement, terminalElementTransform, tl, rt));
 337             routeTerminal.setData( RouteGraphConnection.serialize(graph, connector) );
 338
 339             nodeByData.put( connector, routeTerminal );
 340
 341             for (Resource connectedTo : graph.getObjects(connector, DIA.AreConnected)) {
 342                 links.add( new EdgeResource(connectedTo, connector) );
 343             }
 344         }
 345
 346         // Finish route graph loading by Linking route nodes together
 347         for (EdgeResource link : links) {
 348             RouteNode n1 = nodeByData.get(link.first());
 349             RouteNode n2 = nodeByData.get(link.second());
 350             if (n1 == null || n2 == null) {
 351                 LOGGER.warn("Stray connection link found: " + link.toString(graph));
 352                 continue;
 353             }
 354             rg.link(n1, n2);
 355         }
 356
 357         return rg;
 358
 359     }
 360
 361     public static EdgeEnd toEdgeEnd(ReadGraph graph, Resource attachmentRelation, EdgeEnd defaultValue, DiagramResource DIA)
 362             throws DatabaseException {
 363         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 364             return EdgeEnd.Begin;
 365         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 366             return EdgeEnd.End;
 367         return defaultValue;
 368     }
 369
 370     public static Resource resolveFlagAttachment(ReadGraph graph, Resource connection, Resource flag, IModelingRules modelingRules, DiagramResource DIA) throws DatabaseException {
 371         Type type = resolveFlagType(graph, connection, flag, modelingRules, DIA);
 372         if (type != null) {
 373             switch (type) {
 374                 case In: return DIA.HasPlainConnector;
 375                 case Out: return DIA.HasArrowConnector;
 376             }
 377         }
 378         return null;
 379     }
 380
 381     private static Type resolveFlagType(ReadGraph graph, Resource connection, Resource flag, IModelingRules modelingRules, DiagramResource DIA) throws DatabaseException {
 382         return readFlagType(graph, flag, DIA);
 383     }
 384
 385     private static Type readFlagType(ReadGraph graph, Resource flag, DiagramResource DIA) throws DatabaseException {
 386         Resource flagType = graph.getPossibleObject(flag, DIA.HasFlagType);
 387         Type type = DiagramGraphUtil.toFlagType(DIA, flagType);
 388         return type;
 389     }
 390
 391     public static Statement findTerminalStatement(ReadGraph graph, Resource connection, Resource connector, StructuralResource2 STR)
 392             throws DatabaseException {
 393         for (Statement stm : graph.getStatements(connector, STR.Connects)) {
 394             if (connection.equals(stm.getObject()))
 395                 continue;
 396             return stm;
 397         }
 398         return null;
 399     }
 400
 401     public static Resource getInverseAttachment(ReadGraph graph, Resource attachmentRelation, DiagramResource DIA)
 402             throws DatabaseException {
 403         Resource inverse = graph.getPossibleObject(attachmentRelation, DIA.HasInverseAttachment);
 404         if (inverse != null)
 405             return inverse;
 406         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 407             return DIA.HasPlainConnector;
 408         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 409             return DIA.HasArrowConnector;
 410         return null;
 411     }
 412
 413     public static ILineEndStyle loadLineEndStyle(ReadGraph graph, Resource attachmentRelation, ILineEndStyle defaultValue)
 414             throws DatabaseException {
 415         ILineEndStyle style = graph.syncRequest(new LineEndStyle(attachmentRelation),
 416                 TransientCacheListener.<ILineEndStyle>instance());
 417         return style != null ? style : defaultValue;
 418     }
 419
 420     public static ILineEndStyle loadLineEndStyle(ReadGraph graph, Resource attachmentRelation, Resource connectionType, ILineEndStyle defaultValue)
 421             throws DatabaseException {
 422         if(connectionType != null) {
 423             ILineEndStyle style = graph.syncRequest(new LineEndStyleWithType(attachmentRelation, connectionType),
 424                     TransientCacheListener.<ILineEndStyle>instance());
 425             return style != null ? style : defaultValue;
 426         } else {
 427             ILineEndStyle style = graph.syncRequest(new LineEndStyle(attachmentRelation),
 428                     TransientCacheListener.<ILineEndStyle>instance());
 429             return style != null ? style : defaultValue;
 430         }
 431     }
 432
 433     /**
 434      * A request for caching ILineEndStyle results.
 435      */
 436     public static class LineEndStyle extends UnaryRead<Resource, ILineEndStyle> {
 437         public LineEndStyle(Resource attachmentRelation) {
 438             super(attachmentRelation);
 439         }
 440         @Override
 441         public ILineEndStyle perform(ReadGraph graph) throws DatabaseException {
 442             return loadLineEndStyle0(graph, parameter);
 443         }
 444     }
 445
 446     public static class LineEndStyleWithType extends ResourceRead2<ILineEndStyle> {
 447         public LineEndStyleWithType(Resource attachmentRelation, Resource connectionType) {
 448             super(attachmentRelation, connectionType);
 449         }
 450         @Override
 451         public ILineEndStyle perform(ReadGraph graph) throws DatabaseException {
 452             return loadLineEndStyle0(graph, resource, resource2);
 453         }
 454     }
 455
 456     private static ILineEndStyle loadLineEndStyle0(ReadGraph graph, Resource attachmentRelation)
 457             throws DatabaseException {
 458         ILineEndStyle style = graph.getPossibleAdapter(attachmentRelation, ILineEndStyle.class);
 459         if (style != null)
 460             return style;
 461         DiagramResource DIA = DiagramResource.getInstance(graph);
 462         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 463             return HEAD;
 464         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 465             return TAIL;
 466         return null;
 467     }
 468
 469     private static ILineEndStyle loadLineEndStyle0(ReadGraph graph, Resource attachmentRelation, Resource connectionType)
 470             throws DatabaseException {
 471         DiagramResource DIA = DiagramResource.getInstance(graph);
 472         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector)) {
 473             if(connectionType != null) {
 474                 G2DResource G2D = G2DResource.getInstance(graph);
 475                 Resource end = graph.getPossibleObject(connectionType, G2D.HasEndArrow);
 476                 if(end != null) {
 477                     Double size = graph.getPossibleRelatedValue(end, G2D.HasSize, Bindings.DOUBLE);
 478                     if(size == null) size = 0.0;
 479                     Double widthRatio = graph.getPossibleRelatedValue(end, G2D.HasWidthRatio, Bindings.DOUBLE);
 480                     if(widthRatio == null) widthRatio = 1.0;
 481                     Double space = graph.getPossibleRelatedValue(end, G2D.HasSpace, Bindings.DOUBLE);
 482                     if(space == null) space = 0.0;
 483
 484                     Resource c = graph.getPossibleObject(end, G2D.HasColor);
 485                     Color color = null;
 486                     if (c != null) {
 487                         float[] col = graph.getPossibleValue(c, Bindings.FLOAT_ARRAY);
 488                         if (col != null && col.length >= 3) {
 489                             color = new Color(col[0], col[1], col[2]);
 490                         }
 491                     }
 492
 493                     return new ArrowLineEndStyle(size, widthRatio*size, space, color);
 494                 }
 495             }
 496         }
 497         return loadLineEndStyle0(graph, attachmentRelation);
 498     }
 499
 500     /**
 501      * @param graph
 502      * @param canvas
 503      * @param style
 504      * @return
 505      * @throws DatabaseException
 506      */
 507     public static StyledRouteGraphRenderer getRenderer(ReadGraph graph, ConnectionStyle style)
 508             throws DatabaseException {
 509         return graph.syncRequest(new Renderer(style),
 510                 TransientCacheListener.<StyledRouteGraphRenderer>instance());
 511     }
 512
 513     /**
 514      * A request for caching StyledRouteGraphRenderer results.
 515      */
 516     public static class Renderer extends UnaryRead<ConnectionStyle, StyledRouteGraphRenderer> {
 517         public Renderer(ConnectionStyle style) {
 518             super(style);
 519         }
 520         @Override
 521         public StyledRouteGraphRenderer perform(ReadGraph graph) throws DatabaseException {
 522             return new StyledRouteGraphRenderer(parameter);
 523         }
 524     }
 525
 526     /**
 527      * @param graph
 528      * @param canvas
 529      * @param modelingRules
 530      * @param connection
 531      * @return
 532      * @throws DatabaseException
 533      */
 534     protected static ConnectionStyle readConnectionStyle(ReadGraph graph, IModelingRules modelingRules, Resource connection, StructuralResource2 STR) throws DatabaseException {
 535         Resource connectionType = null;
 536         if (modelingRules != null)
 537             connectionType = modelingRules.getConnectionType(graph, connection);
 538         if (connectionType == null)
 539             connectionType = graph.getPossibleObject(connection, STR.HasConnectionType);
 540         return readConnectionStyleFromConnectionType(graph, connectionType);
 541     }
 542
 543     protected static ConnectionStyle readConnectionStyleFromConnectionType(ReadGraph graph, Resource connectionType) throws DatabaseException {
 544         return graph.syncRequest(new ReadConnectionStyleFromConnectionType(connectionType),
 545                 TransientCacheListener.<ConnectionStyle>instance());
 546     }
 547
 548     /**
 549      * A request for caching ConnectionStyle results.
 550      */
 551     public static class ReadConnectionStyleFromConnectionType extends UnaryRead<Resource, ConnectionStyle> {
 552         public ReadConnectionStyleFromConnectionType(Resource connectionType) {
 553             super(connectionType);
 554         }
 555         @Override
 556         public ConnectionStyle perform(ReadGraph graph) throws DatabaseException {
 557             return readConnectionStyleFromConnectionType0(graph, parameter);
 558         }
 559     }
 560
 561     protected static ConnectionStyle readConnectionStyleFromConnectionType0(ReadGraph graph, Resource connectionType) throws DatabaseException {
 562         ConnectionVisuals cv = null;
 563         if (connectionType != null)
 564             cv = graph.syncRequest(DiagramRequests.getConnectionVisuals(connectionType),
 565                     TransientCacheListener.<ConnectionVisuals>instance());
 566
 567         // Fixed style settings
 568         Color branchPointColor = Color.BLACK;
 569         double branchPointRadius = 0.5;
 570         double degenerateLineLength = 0.8;
 571
 572         Color lineColor = cv != null ? cv.toColor() : null;
 573         if (lineColor == null)
 574             lineColor = Color.DARK_GRAY;
 575         Stroke lineStroke = cv != null ? cv.stroke : null;
 576         if (lineStroke == null)
 577             lineStroke = new BasicStroke(0.1f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 10, null, 0);
 578         Stroke routeLineStroke = GeometryUtils.scaleStrokeWidth(lineStroke, 2);
 579         double rounding = cv.rounding == null ? 0.0 : cv.rounding;
 580
 581         return new BasicConnectionStyle(
 582                 lineColor,
 583                 branchPointColor,
 584                 branchPointRadius,
 585                 lineStroke,
 586                 routeLineStroke,
 587                 degenerateLineLength,
 588                 rounding);
 589     }
 590
 591     public static void scheduleSynchronize(Session session, Resource connection, RouteGraphChangeEvent event) {
 592         session.asyncRequest(RouteGraphConnection.synchronizer(connection, event));
 593     }
 594
 595     // ------------------------------------------------------------------------
 596     // RouteGraph RouteTerminal allowed direction rotation support
 597     // ------------------------------------------------------------------------
 598
 599     public static int rotateDirection(int direction, AffineTransform at) {
 600         // When direct routing is enabled, no point in wasting time rotating.
 601         if ((direction & RouteTerminal.DIR_DIRECT) != 0)
 602             return direction;
 603
 604         final int mask = (AffineTransform.TYPE_MASK_ROTATION | AffineTransform.TYPE_FLIP);
 605         boolean rotatedOrFlipped = (at.getType() & mask) != 0;
 606         if (rotatedOrFlipped) {
 607             double xAxisAngle = Math.atan2( at.getShearY(), at.getScaleX() );
 608             double yAxisAngle = Math.atan2( at.getScaleY(), at.getShearX() );
 609
 610             int xQuadrant = mainQuadrant(xAxisAngle);
 611             int yQuadrant = mainQuadrant(yAxisAngle);
 612
 613             int xDirMask = direction & (RouteTerminal.DIR_LEFT | RouteTerminal.DIR_RIGHT);
 614             int yDirMask = direction & (RouteTerminal.DIR_DOWN | RouteTerminal.DIR_UP);
 615
 616             int xDirMaskRotated = rotl4(xDirMask, xQuadrant);
 617             int yDirMaskRotated = rotl4(yDirMask, yQuadrant-1);
 618
 619             direction = xDirMaskRotated | yDirMaskRotated;
 620         }
 621
 622         return direction;
 623     }
 624
 625     /**
 626      * 4-bit rotate left without carry operation.
 627      * Operates on the 4 least sensitive bits of the integer
 628      * and leaves the higher bits untouched.
 629      * @param x the bits to rotate
 630      * @param n the amount of rotation [0..3]
 631      * @return
 632      */
 633     private static int rotl4(int x, int n) {
 634         n &= 3;
 635         if (n == 0)
 636             return x;
 637         int hx = x & 0xfffffff0;
 638         int lx = x & 0xf;
 639         int xh = (lx << n) & 0xf;
 640         int xl = (lx >>> (4-n));
 641         return xh | xl | hx;
 642     }
 643
 644         /**
 645      * <pre>
 646      *  33
 647      * 2\/0
 648      * 2/\0
 649      *  11
 650      * </pre>
 651      *
 652      * @param theta angle in radians
 653      * @return the quadrant based on the ASCII art above
 654      */
 655     private static int mainQuadrant(double theta) {
 656         if (theta > -DEG_45 && theta <= DEG_45) {
 657             return 0;
 658         } else if ((theta > DEG_45 && theta <= DEG_135)) {
 659             return 1;
 660         } else if (theta >= -DEG_135 && theta < -DEG_45) {
 661             return 3;
 662         }
 663         return 2;
 664     }
 665
 666     private static final double DEG_45 = Math.PI/4.;
 667     private static final double DEG_135 = Math.PI*3./4.;
 668
 669     public static class BackendConnection {
 670         public final Resource node;
 671         public final Resource terminal;
 672         public final EdgeEnd  end;
 673         public final int hash;
 674         public BackendConnection(EdgeEnd end, Resource node, Resource terminal) {
 675             assert end != null;
 676             assert node != null;
 677             assert terminal != null;
 678             this.end = end;
 679             this.node = node;
 680             this.terminal = terminal;
 681             this.hash = makeHash();
 682         }
 683         @Override
 684         public boolean equals(Object obj) {
 685             if (this == obj)
 686                 return true;
 687             if (!(obj instanceof Connection))
 688                 return false;
 689             Connection other = (Connection) obj;
 690             return other.terminal == terminal
 691                     && other.node == node
 692                     && other.end == end;
 693         }
 694         private int makeHash() {
 695             final int prime = 31;
 696             int result = 1;
 697             result = prime * result + end.hashCode();
 698             result = prime * result + ((node == null) ? 0 : node.hashCode());
 699             result = prime * result + ((terminal == null) ? 0 : terminal.hashCode());
 700             return result;
 701         }
 702         @Override
 703         public int hashCode() {
 704             return hash;
 705         }
 706         @Override
 707         public String toString() {
 708             return "BackendConnection[node=" + node + ", terminal=" + terminal + ", end=" + end + "]";
 709         }
 710     }
 711
 712     private static class RouteTerminalPositionImpl implements RouteTerminalPosition {
 713
 714         private IDiagram diagram;
 715         private DataElementMap dataElementMap;
 716         private Resource element;
 717         private AffineTransform elementTransform;
 718         private TerminalLayout terminalLayout;
 719         private Terminal elementTerminal;
 720
 721         private transient AffineTransform lastTerminalTr;
 722         private transient AffineTransform transform;
 723
 724         public RouteTerminalPositionImpl(IDiagram diagram, DataElementMap dem, Resource element, AffineTransform elementTransform, TerminalLayout terminalLayout, Terminal terminal) {
 725             this.diagram = diagram;
 726             this.dataElementMap = dem;
 727             this.element = element;
 728             this.elementTransform = elementTransform;
 729             this.terminalLayout = terminalLayout;
 730             this.elementTerminal = terminal;
 731         }
 732
 733         @Override
 734         public AffineTransform getTransform() {
 735             IElement actualElement = dataElementMap.getElement(diagram, element);
 736             AffineTransform terminalTr = actualElement != null ? terminalLayout.getTerminalPosition(actualElement, elementTerminal) : null;
 737             if (terminalTr == null)
 738                 return elementTransform;
 739
 740             // Return cached transform if terminal transform has not changed.
 741             AffineTransform result = this.transform;
 742             AffineTransform lastTerminalTr = this.lastTerminalTr;
 743             if (lastTerminalTr != null) {
 744                 if (terminalTr.equals(lastTerminalTr))
 745                     return result;
 746                 lastTerminalTr.setTransform(terminalTr);
 747             } else {
 748                 lastTerminalTr = this.lastTerminalTr = new AffineTransform(terminalTr);
 749                 result = this.transform = new AffineTransform();
 750             }
 751
 752             result.setTransform(elementTransform);
 753             result.concatenate(terminalTr);
 754             return result;
 755         }
 756
 757     }
 758 }