bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/NodeRequest2.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 java.util.List;
  15
  16 import org.simantics.db.AsyncReadGraph;
  17 import org.simantics.db.Resource;
  18 import org.simantics.db.common.primitiverequest.Adapter;
  19 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
  20 import org.simantics.db.procedure.AsyncProcedure;
  21 import org.simantics.db.procedure.Listener;
  22 import org.simantics.diagram.synchronization.ErrorHandler;
  23 import org.simantics.g2d.canvas.ICanvasContext;
  24 import org.simantics.g2d.diagram.IDiagram;
  25 import org.simantics.g2d.diagram.handler.SubstituteElementClass;
  26 import org.simantics.g2d.element.ElementClass;
  27 import org.simantics.g2d.element.IElement;
  28 import org.simantics.scl.runtime.tuple.Tuple3;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /**
  33  * @author Antti Villberg
  34  */
  35 public class NodeRequest2 extends BaseRequest2<Resource, Tuple3> {
  36
  37     private static final Logger LOGGER = LoggerFactory.getLogger(NodeRequest2.class);
  38
  39     final IDiagram diagram;
  40
  41     public NodeRequest2(ICanvasContext canvas, IDiagram diagram, Resource resource) {
  42         super(canvas, resource);
  43         this.diagram = diagram;
  44     }
  45
  46     @Override
  47     public void perform(AsyncReadGraph graph, final AsyncProcedure<Tuple3> procedure) {
  48         // Keep this code from crashing the whole DB client by unexpected
  49         // throwing of NPE's somewhere in the following code that leads to
  50         // procedure not getting called properly.
  51         if (diagram == null) {
  52             procedure.exception(graph, new NullPointerException("null diagram specified for resource " + data));
  53             return;
  54         }
  55
  56         final ErrorHandler eh = ElementFactoryUtil.getErrorHandler(diagram);
  57
  58         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {
  59
  60             @Override
  61             public void exception(AsyncReadGraph graph, Throwable throwable) {
  62                 eh.error("NodeRequest.forHasStatement failed", throwable);
  63                 procedure.execute(graph, null);
  64             }
  65
  66             @Override
  67             public void execute(AsyncReadGraph graph, Boolean result) {
  68
  69                 if(!result) {
  70                     procedure.execute(graph, null);
  71                     return;
  72                 }
  73
  74                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {
  75
  76                     @Override
  77                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  78                         eh.error("NodeRequest.asyncRequest(Adapter<ElementFactory>) failed", throwable);
  79                         procedure.execute(graph, null);
  80                     }
  81
  82                     @Override
  83                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {
  84
  85                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {
  86
  87                             @Override
  88                             public void exception(AsyncReadGraph graph, Throwable throwable) {
  89                                 LOGGER.error("Unexpected error in GetElementClassRequest", throwable);
  90                                 procedure.execute(graph, null);
  91                             }
  92
  93                             @Override
  94                             public void execute(AsyncReadGraph graph, ElementClass mutableClazz) {
  95                                 List<SubstituteElementClass> substitutes = diagram.getDiagramClass().getItemsByClass(SubstituteElementClass.class);
  96                                 for (SubstituteElementClass subs : substitutes) {
  97                                     mutableClazz = subs.substitute(diagram, mutableClazz);
  98                                 }
  99                                 final ElementClass clazz = mutableClazz;
 100                                 graph.asyncRequest(new SpawnRequest(canvas, clazz, data), new TransientCacheAsyncListener<IElement>() {
 101
 102                                     @Override
 103                                     public void exception(AsyncReadGraph graph, Throwable throwable) {
 104                                         LOGGER.error("Unexpected error in SpawnRequest", throwable);
 105                                         procedure.execute(graph, null);
 106                                     }
 107
 108                                     @Override
 109                                     public void execute(AsyncReadGraph graph, IElement element) {
 110                                         procedure.execute(graph, new Tuple3(element, clazz, factory));
 111                                     }
 112
 113                                 });
 114
 115                             }
 116
 117                         });
 118
 119                     }
 120
 121                 });
 122
 123             }
 124
 125         });
 126
 127     }
 128
 129 }