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.Indexing;
   7 import org.simantics.db.common.changeset.GenericChangeListener;
   8 import org.simantics.db.event.ChangeListener;
   9 import org.simantics.db.exception.DatabaseException;
  10 import org.simantics.db.layer0.genericrelation.DependenciesRelation.DependencyChangesRequest;
  11 import org.simantics.db.layer0.genericrelation.DependencyChanges;
  12 import org.simantics.scl.runtime.function.Function;
  13 import org.simantics.scl.runtime.function.Function1;
  14 import org.simantics.scl.runtime.tuple.Tuple0;
  15
  16 public class SCLDependencyChangeListener extends GenericChangeListener<DependencyChangesRequest, DependencyChanges> {
  17
  18     private Function1<Tuple0, Boolean> preEventRequest;
  19     private Function onEvent;
  20
  21     public SCLDependencyChangeListener(Function1<Tuple0, Boolean> preEventRequest, Function onEvent) {
  22         this.preEventRequest = preEventRequest;
  23         this.onEvent = onEvent;
  24     }
  25
  26     @Override
  27     public boolean preEventRequest() {
  28         if(Indexing.isDependenciesIndexingDisabled()) return false;
  29         return preEventRequest.apply(Tuple0.INSTANCE);
  30     }
  31
  32     @SuppressWarnings("unchecked")
  33     @Override
  34     public void onEvent(ReadGraph graph, MetadataI metadata, DependencyChanges event) throws DatabaseException {
  35         Simantics.applySCLRead(graph, onEvent, metadata, event);
  36     }
  37
  38     public static ChangeListener create(Function1<Tuple0, Boolean> preEventRequest, Function onEvent) {
  39         return new SCLDependencyChangeListener(preEventRequest, onEvent);
  40     }
  41
  42 }