bundles/org.simantics.structural2/src/org/simantics/structural2/utils/StructuralMetadataUtils.java

   1 package org.simantics.structural2.utils;
   2
   3 import gnu.trove.set.hash.THashSet;
   4
   5 import org.simantics.db.ReadGraph;
   6 import org.simantics.db.Resource;
   7 import org.simantics.db.exception.DatabaseException;
   8 import org.simantics.db.layer0.changeset.ChangeVisitor;
   9 import org.simantics.db.layer0.changeset.MetadataUtils;
  10 import org.simantics.db.layer0.genericrelation.DependencyChanges;
  11 import org.simantics.db.layer0.genericrelation.DependencyChanges.Change;
  12 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentAddition;
  13 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentModification;
  14 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentRemoval;
  15 import org.simantics.db.layer0.request.ModelInstances;
  16 import org.simantics.layer0.Layer0;
  17 import org.simantics.structural.stubs.StructuralResource2;
  18
  19 public class StructuralMetadataUtils {
  20
  21         private static ChangeVisitor getChangeVisitor(final ReadGraph graph, final Resource model, final StructuralChangeVisitor visitor) throws DatabaseException {
  22
  23                 return new ChangeVisitor() {
  24
  25             Layer0 L0 = Layer0.getInstance(graph);
  26             StructuralResource2 STR = StructuralResource2.getInstance(graph);
  27             THashSet<Resource> visited = new THashSet<Resource>();
  28             Resource IsLiftedAs = graph.getResource("http://www.simantics.org/Diagram-2.2/IsLiftedAs");
  29
  30             @Override
  31             public void visit(ReadGraph graph, Change change, boolean inverted)
  32                     throws DatabaseException {
  33
  34                 switch(change.getType()) {
  35                 case COMPONENT_ADDITION: {
  36                     ComponentAddition addition = (ComponentAddition)change;
  37                     if(inverted)
  38                         visitor.visitComponentChange(graph, addition.parent, false);
  39                     else
  40                         visitor.visitComponentChange(graph, addition.component, true);
  41                 } break;
  42                 case COMPONENT_MODIFICATION: {
  43                     ComponentModification modification = (ComponentModification)change;
  44                     handleModification(graph, modification.component);
  45                 } break;
  46                 case COMPONENT_REMOVAL: {
  47                     ComponentRemoval removal = (ComponentRemoval)change;
  48                     if(inverted)
  49                         visitor.visitComponentChange(graph, removal.component, true);
  50                     else
  51                         visitor.visitComponentChange(graph, removal.parent, false);
  52                 } break;
  53                 case LINK_CHANGE:
  54                     // Link changes should not affect the structural configuration
  55                     break;
  56                 }
  57             }
  58
  59             void handleModification(ReadGraph graph, Resource resource) throws DatabaseException {
  60                 if(!visited.add(resource))
  61                     return;
  62                 if(!graph.hasStatement(resource))
  63                     return;
  64                 //System.out.println("handleModification: " + graph.getPossibleURI(resource));
  65                 if(graph.isInstanceOf(resource, STR.Component))
  66                     visitor.visitComponentChange(graph, resource, true);
  67                 else if(graph.isInstanceOf(resource, STR.Connection))
  68                     for(Resource connection : StructuralUtils.getRelatedConnections(graph, resource))
  69                         handleConnectionChange(graph, connection);
  70                 else if(graph.isInstanceOf(resource, STR.ConnectionJoin))
  71                     for(Resource connection : StructuralUtils.getRelatedConnectionsOfConnectionJoin(graph, resource))
  72                         handleConnectionChange(graph, connection);
  73                 else if(graph.isInstanceOf(resource, STR.ComponentType))
  74                     for(Resource instance : graph.syncRequest(new ModelInstances(model, resource)).values())
  75                         visitor.visitComponentChange(graph, instance, true);
  76                 else {
  77                     Resource connectionRelation = graph.getPossibleObject(resource, IsLiftedAs);
  78                     if(connectionRelation != null)
  79                         handleConnectionRelation(graph, connectionRelation);
  80                     else
  81                         for(Resource parent : graph.getObjects(resource, L0.IsDependencyOf))
  82                             handleModification(graph, parent);
  83                 }
  84             }
  85
  86             void handleConnectionChange(ReadGraph graph, Resource connection) throws DatabaseException {
  87                 for(Resource component : graph.getObjects(connection, STR.Connects))
  88                     visitor.visitComponentChange(graph, component, true);
  89                 for(Resource connectionRelation : graph.getObjects(connection, STR.Binds))
  90                     handleConnectionRelation(graph, connectionRelation);
  91             }
  92
  93             void handleConnectionRelation(ReadGraph graph, Resource connectionRelation) throws DatabaseException {
  94                 Resource componentType = graph.getPossibleObject(connectionRelation, L0.HasDomain);
  95                 if(componentType == null)
  96                     return;
  97                 for(Resource instance : graph.syncRequest(new ModelInstances(model, componentType)).values())
  98                     for(Resource connection2 : graph.getObjects(instance, connectionRelation))
  99                         handleConnectionChange(graph, connection2);
 100             }
 101
 102         };
 103         }
 104
 105     /**
 106      * Finds all structural changes made to the given {@code model} from the given revision and calls
 107      * the {@code visitor} for them.
 108      * The function processes raw metadata about modifications to resources and produces changes
 109      * to components. It implements the following rules:
 110      * <ul>
 111      *     <li>Component removal implies a change to the parent of the component</li>
 112      *     <li>Component addition implies a change to the added component.</li>
 113      *     <li>A modification in the connection or join implies a change to all reachable components of the connection</li>
 114      *     <li>A modification in a component type implies a change to all its instances</li>
 115      * </ul>
 116      */
 117     public static void visitStructuralChangesFrom(final ReadGraph graph, final Resource model, long fromRevision,
 118             final StructuralChangeVisitor visitor) throws DatabaseException {
 119         MetadataUtils.visitDependencyChangesFrom(graph, model, fromRevision, getChangeVisitor(graph, model, visitor));
 120     }
 121
 122     public static void visitStructuralChangesFrom(final ReadGraph graph, final Resource model, DependencyChanges.Change[] changes,
 123             final StructuralChangeVisitor visitor) throws DatabaseException {
 124         MetadataUtils.visitDependencyChangesFrom2(graph, model, changes, getChangeVisitor(graph, model, visitor));
 125     }
 126
 127 }