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

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