bundles/org.simantics.modeling/src/org/simantics/modeling/scl/SCLDependencyChangeListener.java

   1 package org.simantics.modeling.scl;
   2
   3 import org.simantics.Simantics;
   4 import org.simantics.db.MetadataI;
   5 import org.simantics.db.ReadGraph;
   6 import org.simantics.db.common.changeset.GenericChangeListener;
   7 import org.simantics.db.event.ChangeListener;
   8 import org.simantics.db.exception.DatabaseException;
   9 import org.simantics.db.layer0.genericrelation.DependenciesRelation.DependencyChangesRequest;
  10 import org.simantics.db.layer0.genericrelation.DependencyChanges;
  11 import org.simantics.scl.runtime.function.Function;
  12 import org.simantics.scl.runtime.function.Function1;
  13 import org.simantics.scl.runtime.tuple.Tuple0;
  14
  15 public class SCLDependencyChangeListener extends GenericChangeListener<DependencyChangesRequest, DependencyChanges> {
  16
  17     private Function1<Tuple0, Boolean> preEventRequest;
  18     private Function onEvent;
  19
  20     public SCLDependencyChangeListener(Function1<Tuple0, Boolean> preEventRequest, Function onEvent) {
  21         this.preEventRequest = preEventRequest;
  22         this.onEvent = onEvent;
  23     }
  24
  25     @Override
  26     public boolean preEventRequest() {
  27         return preEventRequest.apply(Tuple0.INSTANCE);
  28     }
  29
  30     @SuppressWarnings("unchecked")
  31     @Override
  32     public void onEvent(ReadGraph graph, MetadataI metadata, DependencyChanges event) throws DatabaseException {
  33         Simantics.applySCLRead(graph, onEvent, metadata, event);
  34     }
  35
  36     public static ChangeListener create(Function1<Tuple0, Boolean> preEventRequest, Function onEvent) {
  37         return new SCLDependencyChangeListener(preEventRequest, onEvent);
  38     }
  39
  40 }