bundles/org.simantics.diagram/src/org/simantics/diagram/query/ElementClassQuery.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.diagram.query;\r
  13 \r
  14 import org.simantics.db.AsyncReadGraph;\r
  15 import org.simantics.db.Resource;\r
  16 import org.simantics.db.common.request.ResourceAsyncRead;\r
  17 import org.simantics.db.procedure.AsyncProcedure;\r
  18 import org.simantics.diagram.adapter.ElementFactory;\r
  19 import org.simantics.g2d.canvas.impl.DisposedCanvasContext;\r
  20 import org.simantics.g2d.diagram.IDiagram;\r
  21 import org.simantics.g2d.element.ElementClass;\r
  22 import org.simantics.utils.datastructures.hints.IHintObservable;\r
  23 \r
  24 public class ElementClassQuery extends ResourceAsyncRead<ElementClass> {\r
  25 \r
  26     /**\r
  27      * External hints for loading an element class.\r
  28      */\r
  29     IHintObservable hints;\r
  30 \r
  31     public ElementClassQuery(Resource resource, IHintObservable hints) {\r
  32         super(resource);\r
  33         this.hints = hints;\r
  34     }\r
  35 \r
  36     @Override\r
  37     public void perform(AsyncReadGraph graph, AsyncProcedure<ElementClass> procedure) {\r
  38         graph.forAdapted(resource , ElementFactory.class, createElementClass(procedure));\r
  39     }\r
  40 \r
  41     private AsyncProcedure<ElementFactory> createElementClass(final AsyncProcedure<ElementClass> parent) {\r
  42         return new AsyncProcedure<ElementFactory>() {\r
  43             @Override\r
  44             public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  45                 parent.exception(graph, throwable);\r
  46             }\r
  47 \r
  48             @Override\r
  49             public void execute(AsyncReadGraph graph, ElementFactory factory) {\r
  50                 // TODO: remove (IDiagram) cast\r
  51                 factory.create(graph, DisposedCanvasContext.INSTANCE, (IDiagram) hints, resource, new AsyncProcedure<ElementClass>() {\r
  52                     @Override\r
  53                     public void execute(AsyncReadGraph graph, ElementClass result) {\r
  54                         parent.execute(graph, result);\r
  55                     }\r
  56                     @Override\r
  57                     public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  58                         parent.exception(graph, throwable);\r
  59                     }\r
  60                 });\r
  61             }\r
  62         };\r
  63     }\r
  64 \r
  65 }\r