bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/ConnectionRequest2.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.adapter;
  13
  14 import org.simantics.db.AsyncReadGraph;
  15 import org.simantics.db.Resource;
  16 import org.simantics.db.common.primitiverequest.Adapter;
  17 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
  18 import org.simantics.db.procedure.AsyncProcedure;
  19 import org.simantics.diagram.synchronization.ErrorHandler;
  20 import org.simantics.g2d.canvas.ICanvasContext;
  21 import org.simantics.g2d.diagram.IDiagram;
  22 import org.simantics.g2d.element.ElementClass;
  23 import org.simantics.g2d.element.IElement;
  24 import org.simantics.scl.runtime.tuple.Tuple3;
  25
  26 /**
  27  * @author Antti Villberg
  28  */
  29 public class ConnectionRequest2 extends BaseRequest2<Resource, Tuple3> {
  30
  31     final IDiagram diagram;
  32     final ErrorHandler errorHandler;
  33
  34     public ConnectionRequest2(ICanvasContext canvas, IDiagram diagram, Resource resource, ErrorHandler errorHandler) {
  35         super(canvas, resource);
  36         this.diagram = diagram;
  37         this.errorHandler = errorHandler;
  38     }
  39
  40     @Override
  41     public void perform(AsyncReadGraph graph, final AsyncProcedure<Tuple3> procedure) {
  42
  43         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {
  44
  45             @Override
  46             public void exception(AsyncReadGraph graph, Throwable throwable) {
  47                 procedure.exception(graph, throwable);
  48             }
  49
  50             @Override
  51             public void execute(AsyncReadGraph graph, Boolean result) {
  52
  53                 if (!result) {
  54                     procedure.execute(graph, null);
  55                     return;
  56                 }
  57
  58                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {
  59
  60                     @Override
  61                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  62                         errorHandler.error("Unexpected ElementFactory adaption failure", throwable);
  63                         procedure.execute(graph, null);
  64                     }
  65
  66                     @Override
  67                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {
  68
  69                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {
  70
  71                             @Override
  72                             public void exception(AsyncReadGraph graph, Throwable throwable) {
  73                                 errorHandler.error("Unexpected ElementClass creation failure", throwable);
  74                                 procedure.execute(graph, null);
  75                             }
  76
  77                             @Override
  78                             public void execute(AsyncReadGraph graph, final ElementClass ec) {
  79
  80                                 graph.asyncRequest(new SpawnRequest(canvas, ec, data), new TransientCacheAsyncListener<IElement>() {
  81
  82                                     @Override
  83                                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  84                                         errorHandler.error("Unexpected SpawnRequest failure", throwable);
  85                                         procedure.execute(graph, null);
  86                                     }
  87
  88                                     @Override
  89                                     public void execute(AsyncReadGraph graph, IElement element) {
  90                                         procedure.execute(graph, new Tuple3(element, ec, factory));
  91                                     }
  92                                 });
  93                             }
  94                         });
  95                     }
  96                 });
  97             }
  98         });
  99     }
 100
 101 }