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

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