bundles/org.simantics.action.ontology/src/org/simantics/action/ontology/ActionResource.java

   1 package org.simantics.action.ontology;
   2
   3 import org.simantics.db.RequestProcessor;
   4 import org.simantics.db.Resource;
   5 import org.simantics.db.ReadGraph;
   6 import org.simantics.db.request.Read;
   7 import org.simantics.db.Session;
   8 import org.simantics.db.exception.DatabaseException;
   9 import org.simantics.db.service.QueryControl;
  10
  11 public class ActionResource {
  12
  13     public final Resource Action;
  14     public final Resource DropAction;
  15
  16     public static class URIs {
  17         public static final String Action = "http://www.simantics.org/Action-1.1/Action";
  18         public static final String DropAction = "http://www.simantics.org/Action-1.1/DropAction";
  19     }
  20
  21     public static Resource getResourceOrNull(ReadGraph graph, String uri) {
  22         try {
  23             return graph.getResource(uri);
  24         } catch(DatabaseException e) {
  25             System.err.println(e.getMessage());
  26             return null;
  27         }
  28     }
  29
  30     public ActionResource(ReadGraph graph) {
  31         Action = getResourceOrNull(graph, URIs.Action);
  32         DropAction = getResourceOrNull(graph, URIs.DropAction);
  33     }
  34
  35     public static ActionResource getInstance(ReadGraph graph) {
  36         Session session = graph.getSession();
  37         ActionResource ret = session.peekService(ActionResource.class);
  38         if(ret == null) {
  39             QueryControl qc = graph.getService(QueryControl.class);
  40             ret = new ActionResource(qc.getIndependentGraph(graph));
  41             session.registerService(ActionResource.class, ret);
  42         }
  43         return ret;
  44     }
  45
  46     public static ActionResource getInstance(RequestProcessor session) throws DatabaseException {
  47         ActionResource ret = session.peekService(ActionResource.class);
  48         if(ret == null) {
  49             ret = session.syncRequest(new Read<ActionResource>() {
  50                 public ActionResource perform(ReadGraph graph) throws DatabaseException {
  51                     QueryControl qc = graph.getService(QueryControl.class);
  52                     return new ActionResource(qc.getIndependentGraph(graph));
  53                 }
  54             });
  55             session.registerService(ActionResource.class, ret);
  56         }
  57         return ret;
  58     }
  59
  60 }
  61