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