bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/PossibleActiveModel.java

   1 package org.simantics.db.layer0.request;
   2
   3 import java.util.Collection;
   4
   5 import org.simantics.db.ReadGraph;
   6 import org.simantics.db.Resource;
   7 import org.simantics.db.common.request.ResourceRead;
   8 import org.simantics.db.exception.DatabaseException;
   9
  10 /**
  11  * Returns the active model or null if no single active model is available.
  12  */
  13 public class PossibleActiveModel extends ResourceRead<Resource> {
  14
  15     public PossibleActiveModel(Resource project) {
  16         super(project);
  17     }
  18
  19     @Override
  20     public Resource perform(ReadGraph graph) throws DatabaseException {
  21         Collection<Resource> actives = graph.syncRequest(new ActiveModels(resource));
  22         if (actives.size() == 1)
  23             return actives.iterator().next();
  24         else
  25             return null;
  26     }
  27
  28 }