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.RouteLine;
  39 import org.simantics.diagram.connection.RouteNode;
  40 import org.simantics.diagram.connection.RouteTerminal;
  41 import org.simantics.diagram.connection.RouteTerminalPosition;
  42 import org.simantics.diagram.connection.rendering.BasicConnectionStyle;
  43 import org.simantics.diagram.connection.rendering.ConnectionStyle;
  44 import org.simantics.diagram.connection.rendering.ExampleConnectionStyle;
  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.RouteGraphConnectionClass;
  69 import org.simantics.g2d.elementclass.FlagClass.Type;
  70 import org.simantics.layer0.Layer0;
  71 import org.simantics.scenegraph.g2d.nodes.connection.RouteGraphChangeEvent;
  72 import org.simantics.scenegraph.utils.GeometryUtils;
  73 import org.simantics.structural.stubs.StructuralResource2;
  74 import org.simantics.structural2.modelingRules.CPTerminal;
  75 import org.simantics.structural2.modelingRules.IAttachmentRelationMap;
  76 import org.simantics.structural2.modelingRules.IModelingRules;
  77 import org.simantics.utils.threads.CurrentThread;
  78 import org.slf4j.Logger;
  79 import org.slf4j.LoggerFactory;
  80
  81 import gnu.trove.map.hash.THashMap;
  82 import gnu.trove.set.hash.THashSet;
  83
  84 public class RouteGraphUtils {
  85
  86     private static final Logger LOGGER = LoggerFactory.getLogger(RouteGraph.class);
  87     public static boolean DEBUG = false;
  88
  89     public static final ILineEndStyle HEAD  = new ArrowLineEndStyle("fill 2 1 0");
  90     public static final ILineEndStyle TAIL  = PlainLineEndStyle.INSTANCE;
  91
  92     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection) throws DatabaseException {
  93         ICanvasContext canvas = new CanvasContext(CurrentThread.getThreadAccess());
  94         IDiagram diagram = new ElementDiagram(canvas);
  95         return load(graph, diagramRuntime, connection, canvas, diagram);
  96     }
  97
  98     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection, ICanvasContext canvas, IDiagram diagram) throws DatabaseException {
  99         Layer0 L0 = Layer0.getInstance(graph);
 100         Resource diagramResource = graph.getPossibleObject(connection, L0.PartOf);
 101         IModelingRules modelingRules = graph.syncRequest(DiagramRequests.getModelingRules(diagramResource, null), TransientCacheListener.<IModelingRules>instance());
 102         return load(graph, diagramRuntime, connection, canvas, diagram, null, modelingRules, null);
 103     }
 104
 105     public static RouteGraph load(ReadGraph graph, Resource diagramRuntime, Resource connection, ICanvasContext canvas, IDiagram diagram, IElement element, IModelingRules modelingRules, Set<BackendConnection> backendConnections) throws DatabaseException {
 106
 107         DiagramResource DIA = DiagramResource.getInstance(graph);
 108         StructuralResource2 STR = StructuralResource2.getInstance(graph);
 109
 110         RouteGraph rg = new RouteGraph();
 111
 112         // Default capacity should be enough for common cases.
 113         Set<EdgeResource> links = new THashSet<>();
 114         Map<Object, RouteNode> nodeByData = new THashMap<>();
 115
 116         // Load all route graph interior RouteNodes: route lines and points
 117         for (Resource interiorNode : graph.getObjects(connection, DIA.HasInteriorRouteNode)) {
 118             if (graph.isInstanceOf(interiorNode, DIA.RouteLine)) {
 119                 Collection<Resource> areConnected = graph.getObjects(interiorNode, DIA.AreConnected);
 120                 if (areConnected.size() < 2) {
 121                     // Degenerated route line encountered, most likely due to a bug somewhere else.
 122                     // Ignoring them because adding them to the RouteGraph structure would cause
 123                     // problems during rendering.
 124                     LOGGER.warn("Stray RouteLine found: " + NameUtils.getSafeName(graph, interiorNode));
 125                     continue;
 126                 }
 127
 128                 Boolean isHorizontal = graph.getRelatedValue(interiorNode, DIA.IsHorizontal, Bindings.BOOLEAN);
 129                 Double position = graph.getRelatedValue(interiorNode, DIA.HasPosition, Bindings.DOUBLE);
 130                 RouteLine line = rg.addLine(isHorizontal, position);
 131                 line.setData( RouteGraphConnection.serialize(graph, interiorNode) );
 132
 133                 nodeByData.put( interiorNode, line );
 134
 135                 for (Resource connectedTo : areConnected) {
 136                     links.add( new EdgeResource(interiorNode, connectedTo) );
 137                 }
 138             } else if (graph.isInstanceOf(interiorNode, DIA.RoutePoint)) {
 139                 // Not supported yet. Ignore.
 140             }
 141         }
 142
 143         Rectangle2D bounds = new Rectangle2D.Double();
 144         Map<Resource, Resource> connectorToModeledAttachment = null;
 145
 146         // Primarily the loader will believe what modeling rules say about
 147         // connector attachment relations.
 148         //
 149         // If modeling rules decide nothing, then we simply believe what the
 150         // the attachment relations in the graph say.
 151         //
 152         // Special case 1: connection with two (2) terminals
 153         // If the attachment of one of two terminals is decided by modeling
 154         // rules, the other attachment shall be the opposite of the decided
 155         // attachment (see forcedAttachmentRelation below).
 156         //
 157         // Special case 2: connected to a flag
 158         // If the attached element is a flag and modeling rules say nothing
 159         // about it, believe the direction stated by the flag type.
 160
 161         Collection<Statement> toConnectorStatements = graph.getStatements(connection, DIA.HasConnector);
 162         int terminalCount = 0;
 163
 164         // See if modeling rules judge any of the connection terminal attachments.
 165         if (modelingRules != null) {
 166             for (Statement toConnector : toConnectorStatements) {
 167                 Resource connector = toConnector.getObject();
 168
 169                 Statement terminalStm = findTerminalStatement(graph, connection, connector, STR);
 170                 if (terminalStm == null)
 171                     // Ignore broken connector: attached to the connection but not to any terminal.
 172                     continue;
 173
 174                 Resource terminalElement = terminalStm.getObject();
 175                 Resource connectionRelation = graph.getPossibleInverse(terminalStm.getPredicate());
 176                 if (connectionRelation == null)
 177                     continue;
 178
 179                 ++terminalCount;
 180
 181                 IAttachmentRelationMap map = modelingRules.getAttachmentRelations(graph, connection);
 182                 Resource attachment = map.get(graph, new CPTerminal(terminalElement, connectionRelation));
 183                 if (attachment != null) {
 184                     // Primary: believe modeling rules
 185                     if (connectorToModeledAttachment == null)
 186                         connectorToModeledAttachment = new THashMap<Resource, Resource>(toConnectorStatements.size());
 187                     connectorToModeledAttachment.put(connector, attachment);
 188                     if (DEBUG)
 189                         LOGGER.debug("modeling rules decided attachment: " + NameUtils.getSafeName(graph, attachment, true) + " for (" + NameUtils.toString(graph, toConnector, true) + ") & (" + NameUtils.toString(graph, terminalStm, true) + ")");
 190                 } else if (graph.isInstanceOf(terminalElement, DIA.Flag)) {
 191                     // Secondary: believe flag type
 192                     attachment = resolveFlagAttachment(graph, connection, terminalElement, modelingRules, DIA);
 193                     if (attachment != null) {
 194                         if (connectorToModeledAttachment == null)
 195                             connectorToModeledAttachment = new THashMap<Resource, Resource>(toConnectorStatements.size());
 196                         connectorToModeledAttachment.put(connector, attachment);
 197                         if (DEBUG)
 198                             LOGGER.debug("flag type decided attachment: " + NameUtils.getSafeName(graph, attachment, true) + " for (" + NameUtils.toString(graph, toConnector, true) + ") & (" + NameUtils.toString(graph, terminalStm, true) + ")");
 199                     }
 200                 }
 201             }
 202         }
 203
 204         if (connectorToModeledAttachment == null)
 205             connectorToModeledAttachment = Collections.emptyMap();
 206
 207         Resource forcedAttachmentRelation = null;
 208         if (terminalCount == 2 && connectorToModeledAttachment.size() == 1) {
 209             forcedAttachmentRelation = getInverseAttachment(graph, connectorToModeledAttachment.values().iterator().next(), DIA);
 210             if (DEBUG)
 211                 LOGGER.debug("set forced attachment: " + NameUtils.getSafeLabel(graph, forcedAttachmentRelation));
 212         }
 213
 214         Resource connectionType = graph.getPossibleObject(connection, STR.HasConnectionType);
 215         DataElementMap diagramDataElementMap = diagram.getDiagramClass().getSingleItem(DataElementMap.class);
 216
 217         // Load all node terminal connections as RouteTerminals
 218         for (Statement toConnector : toConnectorStatements) {
 219             Resource connector = toConnector.getObject();
 220             Resource attachmentRelation = toConnector.getPredicate();
 221             if (DEBUG)
 222                 LOGGER.debug("original attachment relation: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 223
 224             Statement terminalStm = findTerminalStatement(graph, connection, connector, STR);
 225             if (terminalStm == null)
 226                 // Ignore broken connector: attached to the connection but not to any terminal.
 227                 continue;
 228
 229             Resource terminalElement = terminalStm.getObject();
 230             Resource terminalElementType = graph.getPossibleType(terminalElement, DIA.Element);
 231             if (terminalElementType == null)
 232                 // Ignore non-element terminal elements
 233                 continue;
 234
 235             Resource connectionRelation = graph.getPossibleInverse(terminalStm.getPredicate());
 236             if (connectionRelation == null)
 237                 continue;
 238
 239             // Discover node and terminal this connector is connected to.
 240             TerminalMap terminals = graph.syncRequest(DiagramRequests.elementTypeTerminals(terminalElementType),
 241                     TransientCacheListener.<TerminalMap>instance());
 242             Resource terminal = terminals.getTerminal(connectionRelation);
 243             if (terminal == null) {
 244                 System.err.println(
 245                         "RouteGraphUtils: Could not find terminal for connection point "
 246                         + NameUtils.getSafeName(graph, connectionRelation, true)
 247                         + " in element "
 248                         + NameUtils.getSafeName(graph, terminalElement, true));
 249                 continue;
 250             }
 251
 252             double[] position = graph.getRelatedValue(connector, DIA.HasRelativeLocation, Bindings.DOUBLE_ARRAY);
 253             if (position.length != 2)
 254                 position = new double[] { 0, 0 };
 255
 256             AffineTransform terminalTr = DiagramGraphUtil.getDynamicWorldTransform(graph, diagramRuntime, terminalElement);
 257             final AffineTransform terminalElementTransform = new AffineTransform(terminalTr);
 258
 259             if (DEBUG) {
 260                 LOGGER.debug("terminalStm: " + NameUtils.toString(graph, terminalStm));
 261                 LOGGER.debug("terminal: " + NameUtils.getURIOrSafeNameInternal(graph, terminalStm.getPredicate()));
 262                 LOGGER.debug("terminalElement: " + NameUtils.getURIOrSafeNameInternal(graph, terminalElement) + " : " + NameUtils.getURIOrSafeNameInternal(graph, terminalElementType));
 263                 LOGGER.debug("terminalElementTr: " + terminalTr);
 264             }
 265
 266             double x = terminalTr.getTranslateX();
 267             double y = terminalTr.getTranslateY();
 268             double minx = x-1, miny = y-1, maxx = x+1, maxy = y+1;
 269             int direction = 0x0;
 270
 271             // Use modelingRules to ascertain the proper attachmentRelation
 272             // for this terminal connection, if available.
 273             Resource att = connectorToModeledAttachment.get(connector);
 274             if (att != null) {
 275                 attachmentRelation = att;
 276                 if (DEBUG)
 277                     LOGGER.debug("modeling rules attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 278             } else if (forcedAttachmentRelation != null) {
 279                 attachmentRelation = forcedAttachmentRelation;
 280                 if (DEBUG)
 281                     LOGGER.debug("forced rules attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 282             }
 283             if (DEBUG)
 284                 LOGGER.debug("decided attachment: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 285
 286             // Get element bounds to decide allowed terminal direction(s)
 287             IElement te = graph.syncRequest(DiagramRequests.getElement(canvas, diagram, terminalElement, null));
 288             ElementUtils.getElementBounds(te, bounds);
 289             {
 290                 Shape shp = org.simantics.g2d.utils.GeometryUtils.transformShape(bounds, terminalTr);
 291                 bounds.setFrame(shp.getBounds2D());
 292             }
 293
 294             // Expand bounds by 2mm to make the connections enter the terminals
 295             // at a straight angle and from a distance instead of coming in
 296             // "horizontally".
 297             GeometryUtils.expandRectangle(bounds, 2);
 298             minx = bounds.getMinX();
 299             miny = bounds.getMinY();
 300             maxx = bounds.getMaxX();
 301             maxy = bounds.getMaxY();
 302
 303             final ResourceTerminal rt = new ResourceTerminal(terminal);
 304             final TerminalLayout tl = te.getElementClass().getSingleItem(TerminalLayout.class);
 305             AffineTransform terminalPos = tl.getTerminalPosition(te, rt);
 306
 307             if (terminalPos != null) {
 308                 terminalTr.concatenate(terminalPos);
 309                 x = terminalTr.getTranslateX();
 310                 y = terminalTr.getTranslateY();
 311                 if (DEBUG)
 312                     LOGGER.debug("terminalPos/Tr: " + terminalPos + ", " + terminalTr);
 313             }
 314
 315             Integer allowedDirections = graph.getPossibleRelatedValue(terminal, DIA.Terminal_AllowedDirections, Bindings.INTEGER);
 316             if (allowedDirections != null) {
 317                 direction |= allowedDirections;
 318                 direction = rotateDirection(direction, terminalTr);
 319             } else {
 320                 direction |= RouteGraphConnectionClass.shortestDirectionOutOfBounds(x, y, bounds);
 321             }
 322             //LOGGER.debug("DIR(" + x + ", " + y + ", " + bounds + "): " + Integer.toHexString(direction));
 323
 324             if (backendConnections != null) {
 325                 backendConnections.add(
 326                         new BackendConnection(
 327                                 toEdgeEnd(graph, attachmentRelation, EdgeEnd.Begin, DIA),
 328                                 terminalElement,
 329                                 terminal)
 330                         );
 331             }
 332
 333             if (direction == 0)
 334                 // Accept any horizontal/vertical direction if nothing is defined
 335                 direction = 0xf;
 336
 337             if (graph.<Boolean>getRelatedValue(connector, DIA.Connector_straight, Bindings.BOOLEAN))
 338                 direction |= RouteTerminal.DIR_DIRECT;
 339             // FIXME: routegraph crashes if this is done for all terminals regardless of the amount of terminals.
 340
 341             if (DEBUG)
 342                 LOGGER.debug("load line style: " + NameUtils.getSafeLabel(graph, attachmentRelation));
 343             ILineEndStyle endStyle = loadLineEndStyle(graph, attachmentRelation, connectionType, TAIL);
 344
 345             RouteTerminal routeTerminal = rg.addTerminal(x, y, minx, miny, maxx, maxy, direction, endStyle,
 346                     new RouteTerminalPositionImpl(diagram, diagramDataElementMap, terminalElement, terminalElementTransform, tl, rt));
 347             routeTerminal.setData( RouteGraphConnection.serialize(graph, connector) );
 348
 349             nodeByData.put( connector, routeTerminal );
 350
 351             for (Resource connectedTo : graph.getObjects(connector, DIA.AreConnected)) {
 352                 links.add( new EdgeResource(connectedTo, connector) );
 353             }
 354         }
 355
 356         // Finish route graph loading by Linking route nodes together
 357         for (EdgeResource link : links) {
 358             RouteNode n1 = nodeByData.get(link.first());
 359             RouteNode n2 = nodeByData.get(link.second());
 360             if (n1 == null || n2 == null) {
 361                 LOGGER.warn("Stray connection link found: " + link.toString(graph));
 362                 continue;
 363             }
 364             rg.link(n1, n2);
 365         }
 366
 367         return rg;
 368
 369     }
 370
 371     public static EdgeEnd toEdgeEnd(ReadGraph graph, Resource attachmentRelation, EdgeEnd defaultValue, DiagramResource DIA)
 372             throws DatabaseException {
 373         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 374             return EdgeEnd.Begin;
 375         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 376             return EdgeEnd.End;
 377         return defaultValue;
 378     }
 379
 380     public static Resource resolveFlagAttachment(ReadGraph graph, Resource connection, Resource flag, IModelingRules modelingRules, DiagramResource DIA) throws DatabaseException {
 381         Type type = resolveFlagType(graph, connection, flag, modelingRules, DIA);
 382         if (type != null) {
 383             switch (type) {
 384                 case In: return DIA.HasPlainConnector;
 385                 case Out: return DIA.HasArrowConnector;
 386             }
 387         }
 388         return null;
 389     }
 390
 391     private static Type resolveFlagType(ReadGraph graph, Resource connection, Resource flag, IModelingRules modelingRules, DiagramResource DIA) throws DatabaseException {
 392         return readFlagType(graph, flag, DIA);
 393     }
 394
 395     private static Type readFlagType(ReadGraph graph, Resource flag, DiagramResource DIA) throws DatabaseException {
 396         Resource flagType = graph.getPossibleObject(flag, DIA.HasFlagType);
 397         Type type = DiagramGraphUtil.toFlagType(DIA, flagType);
 398         return type;
 399     }
 400
 401     public static Statement findTerminalStatement(ReadGraph graph, Resource connection, Resource connector, StructuralResource2 STR)
 402             throws DatabaseException {
 403         for (Statement stm : graph.getStatements(connector, STR.Connects)) {
 404             if (connection.equals(stm.getObject()))
 405                 continue;
 406             return stm;
 407         }
 408         return null;
 409     }
 410
 411     public static Resource getInverseAttachment(ReadGraph graph, Resource attachmentRelation, DiagramResource DIA)
 412             throws DatabaseException {
 413         Resource inverse = graph.getPossibleObject(attachmentRelation, DIA.HasInverseAttachment);
 414         if (inverse != null)
 415             return inverse;
 416         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 417             return DIA.HasPlainConnector;
 418         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 419             return DIA.HasArrowConnector;
 420         return null;
 421     }
 422
 423     public static ILineEndStyle loadLineEndStyle(ReadGraph graph, Resource attachmentRelation, ILineEndStyle defaultValue)
 424             throws DatabaseException {
 425         ILineEndStyle style = graph.syncRequest(new LineEndStyle(attachmentRelation),
 426                 TransientCacheListener.<ILineEndStyle>instance());
 427         return style != null ? style : defaultValue;
 428     }
 429
 430     public static ILineEndStyle loadLineEndStyle(ReadGraph graph, Resource attachmentRelation, Resource connectionType, ILineEndStyle defaultValue)
 431             throws DatabaseException {
 432         if(connectionType != null) {
 433             ILineEndStyle style = graph.syncRequest(new LineEndStyleWithType(attachmentRelation, connectionType),
 434                     TransientCacheListener.<ILineEndStyle>instance());
 435             return style != null ? style : defaultValue;
 436         } else {
 437             ILineEndStyle style = graph.syncRequest(new LineEndStyle(attachmentRelation),
 438                     TransientCacheListener.<ILineEndStyle>instance());
 439             return style != null ? style : defaultValue;
 440         }
 441     }
 442
 443     /**
 444      * A request for caching ILineEndStyle results.
 445      */
 446     public static class LineEndStyle extends UnaryRead<Resource, ILineEndStyle> {
 447         public LineEndStyle(Resource attachmentRelation) {
 448             super(attachmentRelation);
 449         }
 450         @Override
 451         public ILineEndStyle perform(ReadGraph graph) throws DatabaseException {
 452             return loadLineEndStyle0(graph, parameter);
 453         }
 454     }
 455
 456     public static class LineEndStyleWithType extends ResourceRead2<ILineEndStyle> {
 457         public LineEndStyleWithType(Resource attachmentRelation, Resource connectionType) {
 458             super(attachmentRelation, connectionType);
 459         }
 460         @Override
 461         public ILineEndStyle perform(ReadGraph graph) throws DatabaseException {
 462             return loadLineEndStyle0(graph, resource, resource2);
 463         }
 464     }
 465
 466     private static ILineEndStyle loadLineEndStyle0(ReadGraph graph, Resource attachmentRelation)
 467             throws DatabaseException {
 468         ILineEndStyle style = graph.getPossibleAdapter(attachmentRelation, ILineEndStyle.class);
 469         if (style != null)
 470             return style;
 471         DiagramResource DIA = DiagramResource.getInstance(graph);
 472         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector))
 473             return HEAD;
 474         if (graph.isSubrelationOf(attachmentRelation, DIA.HasTailConnector))
 475             return TAIL;
 476         return null;
 477     }
 478
 479     private static ILineEndStyle loadLineEndStyle0(ReadGraph graph, Resource attachmentRelation, Resource connectionType)
 480             throws DatabaseException {
 481         DiagramResource DIA = DiagramResource.getInstance(graph);
 482         if (graph.isSubrelationOf(attachmentRelation, DIA.HasHeadConnector)) {
 483             if(connectionType != null) {
 484                 G2DResource G2D = G2DResource.getInstance(graph);
 485                 Resource end = graph.getPossibleObject(connectionType, G2D.HasEndArrow);
 486                 if(end != null) {
 487                     Double size = graph.getPossibleRelatedValue(end, G2D.HasSize, Bindings.DOUBLE);
 488                     if(size == null) size = 0.0;
 489                     Double widthRatio = graph.getPossibleRelatedValue(end, G2D.HasWidthRatio, Bindings.DOUBLE);
 490                     if(widthRatio == null) widthRatio = 1.0;
 491                     Double space = graph.getPossibleRelatedValue(end, G2D.HasSpace, Bindings.DOUBLE);
 492                     if(space == null) space = 0.0;
 493
 494                     Resource c = graph.getPossibleObject(end, G2D.HasColor);
 495                     Color color = null;
 496                     if (c != null) {
 497                         float[] col = graph.getPossibleValue(c, Bindings.FLOAT_ARRAY);
 498                         if (col != null && col.length >= 3) {
 499                             color = new Color(col[0], col[1], col[2]);
 500                         }
 501                     }
 502
 503                     return new ArrowLineEndStyle(size, widthRatio*size, space, color);
 504                 }
 505             }
 506         }
 507         return loadLineEndStyle0(graph, attachmentRelation);
 508     }
 509
 510     /**
 511      * @param graph
 512      * @param canvas
 513      * @param style
 514      * @return
 515      * @throws DatabaseException
 516      */
 517     public static StyledRouteGraphRenderer getRenderer(ReadGraph graph, ConnectionStyle style)
 518             throws DatabaseException {
 519         return graph.syncRequest(new Renderer(style),
 520                 TransientCacheListener.<StyledRouteGraphRenderer>instance());
 521     }
 522
 523     /**
 524      * A request for caching StyledRouteGraphRenderer results.
 525      */
 526     public static class Renderer extends UnaryRead<ConnectionStyle, StyledRouteGraphRenderer> {
 527         public Renderer(ConnectionStyle style) {
 528             super(style);
 529         }
 530         @Override
 531         public StyledRouteGraphRenderer perform(ReadGraph graph) throws DatabaseException {
 532             return new StyledRouteGraphRenderer(parameter);
 533         }
 534     }
 535
 536     private static final ConnectionStyle DEFAULT_CONNECTION_STYLE = new BasicConnectionStyle(Color.BLACK, Color.BLACK, 3, ExampleConnectionStyle.SOLID, ExampleConnectionStyle.SOLID, 8);
 537
 538     /**
 539      * @param graph
 540      * @param canvas
 541      * @param modelingRules
 542      * @param connection
 543      * @return
 544      * @throws DatabaseException
 545      */
 546     protected static ConnectionStyle readConnectionStyle(ReadGraph graph, IModelingRules modelingRules, Resource connection, StructuralResource2 STR) throws DatabaseException {
 547         Resource connectionType = null;
 548         if (modelingRules != null)
 549             connectionType = modelingRules.getConnectionType(graph, connection);
 550         if (connectionType == null)
 551             connectionType = graph.getPossibleObject(connection, STR.HasConnectionType);
 552         return connectionType != null ? readConnectionStyleFromConnectionType(graph, connectionType) : DEFAULT_CONNECTION_STYLE;
 553     }
 554
 555     protected static ConnectionStyle readConnectionStyleFromConnectionType(ReadGraph graph, Resource connectionType) throws DatabaseException {
 556         return graph.syncRequest(new ReadConnectionStyleFromConnectionType(connectionType),
 557                 TransientCacheListener.<ConnectionStyle>instance());
 558     }
 559
 560     /**
 561      * A request for caching ConnectionStyle results.
 562      */
 563     public static class ReadConnectionStyleFromConnectionType extends UnaryRead<Resource, ConnectionStyle> {
 564         public ReadConnectionStyleFromConnectionType(Resource connectionType) {
 565             super(connectionType);
 566         }
 567         @Override
 568         public ConnectionStyle perform(ReadGraph graph) throws DatabaseException {
 569             return readConnectionStyleFromConnectionType0(graph, parameter);
 570         }
 571     }
 572
 573     protected static ConnectionStyle readConnectionStyleFromConnectionType0(ReadGraph graph, Resource connectionType) throws DatabaseException {
 574         ConnectionVisuals cv = null;
 575         if (connectionType != null)
 576             cv = graph.syncRequest(DiagramRequests.getConnectionVisuals(connectionType),
 577                     TransientCacheListener.<ConnectionVisuals>instance());
 578
 579         // Fixed style settings
 580         Color branchPointColor = Color.BLACK;
 581         double branchPointRadius = cv != null && cv.branchPointRadius != null ? cv.branchPointRadius : 0.5;
 582         double degenerateLineLength = 0.8;
 583
 584         Color lineColor = cv != null ? cv.toColor() : null;
 585         if (lineColor == null)
 586             lineColor = Color.DARK_GRAY;
 587         Stroke lineStroke = cv != null ? cv.stroke : null;
 588         if (lineStroke == null)
 589             lineStroke = new BasicStroke(0.1f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 10, null, 0);
 590         Stroke routeLineStroke = GeometryUtils.scaleStrokeWidth(lineStroke, 2);
 591         double rounding = cv.rounding == null ? 0.0 : cv.rounding;
 592
 593         return new BasicConnectionStyle(
 594                 lineColor,
 595                 branchPointColor,
 596                 branchPointRadius,
 597                 lineStroke,
 598                 routeLineStroke,
 599                 degenerateLineLength,
 600                 rounding);
 601     }
 602
 603     public static void scheduleSynchronize(Session session, Resource connection, RouteGraphChangeEvent event) {
 604         session.asyncRequest(RouteGraphConnection.synchronizer(connection, event));
 605     }
 606
 607     // ------------------------------------------------------------------------
 608     // RouteGraph RouteTerminal allowed direction rotation support
 609     // ------------------------------------------------------------------------
 610
 611     public static int rotateDirection(int direction, AffineTransform at) {
 612         // When direct routing is enabled, no point in wasting time rotating.
 613         if ((direction & RouteTerminal.DIR_DIRECT) != 0)
 614             return direction;
 615
 616         final int mask = (AffineTransform.TYPE_MASK_ROTATION | AffineTransform.TYPE_FLIP);
 617         boolean rotatedOrFlipped = (at.getType() & mask) != 0;
 618         if (rotatedOrFlipped) {
 619             double xAxisAngle = Math.atan2( at.getShearY(), at.getScaleX() );
 620             double yAxisAngle = Math.atan2( at.getScaleY(), at.getShearX() );
 621
 622             int xQuadrant = mainQuadrant(xAxisAngle);
 623             int yQuadrant = mainQuadrant(yAxisAngle);
 624
 625             int xDirMask = direction & (RouteTerminal.DIR_LEFT | RouteTerminal.DIR_RIGHT);
 626             int yDirMask = direction & (RouteTerminal.DIR_DOWN | RouteTerminal.DIR_UP);
 627
 628             int xDirMaskRotated = rotl4(xDirMask, xQuadrant);
 629             int yDirMaskRotated = rotl4(yDirMask, yQuadrant-1);
 630
 631             direction = xDirMaskRotated | yDirMaskRotated;
 632         }
 633
 634         return direction;
 635     }
 636
 637     /**
 638      * 4-bit rotate left without carry operation.
 639      * Operates on the 4 least sensitive bits of the integer
 640      * and leaves the higher bits untouched.
 641      * @param x the bits to rotate
 642      * @param n the amount of rotation [0..3]
 643      * @return
 644      */
 645     private static int rotl4(int x, int n) {
 646         n &= 3;
 647         if (n == 0)
 648             return x;
 649         int hx = x & 0xfffffff0;
 650         int lx = x & 0xf;
 651         int xh = (lx << n) & 0xf;
 652         int xl = (lx >>> (4-n));
 653         return xh | xl | hx;
 654     }
 655
 656         /**
 657      * <pre>
 658      *  33
 659      * 2\/0
 660      * 2/\0
 661      *  11
 662      * </pre>
 663      *
 664      * @param theta angle in radians
 665      * @return the quadrant based on the ASCII art above
 666      */
 667     private static int mainQuadrant(double theta) {
 668         if (theta > -DEG_45 && theta <= DEG_45) {
 669             return 0;
 670         } else if ((theta > DEG_45 && theta <= DEG_135)) {
 671             return 1;
 672         } else if (theta >= -DEG_135 && theta < -DEG_45) {
 673             return 3;
 674         }
 675         return 2;
 676     }
 677
 678     private static final double DEG_45 = Math.PI/4.;
 679     private static final double DEG_135 = Math.PI*3./4.;
 680
 681     public static class BackendConnection {
 682         public final Resource node;
 683         public final Resource terminal;
 684         public final EdgeEnd  end;
 685         public final int hash;
 686         public BackendConnection(EdgeEnd end, Resource node, Resource terminal) {
 687             assert end != null;
 688             assert node != null;
 689             assert terminal != null;
 690             this.end = end;
 691             this.node = node;
 692             this.terminal = terminal;
 693             this.hash = makeHash();
 694         }
 695         @Override
 696         public boolean equals(Object obj) {
 697             if (this == obj)
 698                 return true;
 699             if (!(obj instanceof Connection))
 700                 return false;
 701             Connection other = (Connection) obj;
 702             return other.terminal == terminal
 703                     && other.node == node
 704                     && other.end == end;
 705         }
 706         private int makeHash() {
 707             final int prime = 31;
 708             int result = 1;
 709             result = prime * result + end.hashCode();
 710             result = prime * result + ((node == null) ? 0 : node.hashCode());
 711             result = prime * result + ((terminal == null) ? 0 : terminal.hashCode());
 712             return result;
 713         }
 714         @Override
 715         public int hashCode() {
 716             return hash;
 717         }
 718         @Override
 719         public String toString() {
 720             return "BackendConnection[node=" + node + ", terminal=" + terminal + ", end=" + end + "]";
 721         }
 722     }
 723
 724     private static class RouteTerminalPositionImpl implements RouteTerminalPosition {
 725
 726         private IDiagram diagram;
 727         private DataElementMap dataElementMap;
 728         private Resource element;
 729         private AffineTransform elementTransform;
 730         private TerminalLayout terminalLayout;
 731         private Terminal elementTerminal;
 732
 733         private transient AffineTransform lastTerminalTr;
 734         private transient AffineTransform transform;
 735
 736         public RouteTerminalPositionImpl(IDiagram diagram, DataElementMap dem, Resource element, AffineTransform elementTransform, TerminalLayout terminalLayout, Terminal terminal) {
 737             this.diagram = diagram;
 738             this.dataElementMap = dem;
 739             this.element = element;
 740             this.elementTransform = elementTransform;
 741             this.terminalLayout = terminalLayout;
 742             this.elementTerminal = terminal;
 743         }
 744
 745         @Override
 746         public AffineTransform getTransform() {
 747             IElement actualElement = dataElementMap.getElement(diagram, element);
 748             AffineTransform terminalTr = actualElement != null ? terminalLayout.getTerminalPosition(actualElement, elementTerminal) : null;
 749             if (terminalTr == null)
 750                 return elementTransform;
 751
 752             // Return cached transform if terminal transform has not changed.
 753             AffineTransform result = this.transform;
 754             AffineTransform lastTerminalTr = this.lastTerminalTr;
 755             if (lastTerminalTr != null) {
 756                 if (terminalTr.equals(lastTerminalTr))
 757                     return result;
 758                 lastTerminalTr.setTransform(terminalTr);
 759             } else {
 760                 lastTerminalTr = this.lastTerminalTr = new AffineTransform(terminalTr);
 761                 result = this.transform = new AffineTransform();
 762             }
 763
 764             result.setTransform(elementTransform);
 765             result.concatenate(terminalTr);
 766             return result;
 767         }
 768
 769     }
 770 }