bundles/org.simantics.color.ontology/src/org/simantics/color/ColorResource.java

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