bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/NodeRequest.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.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * @author Antti Villberg
  33  */
  34 public class NodeRequest extends BaseRequest2<Resource, IElement> {
  35
  36     private static final Logger LOGGER = LoggerFactory.getLogger(NodeRequest.class);
  37
  38     final IDiagram diagram;
  39     final Listener<IElement> loadListener;
  40
  41     public NodeRequest(ICanvasContext canvas, IDiagram diagram, Resource resource, Listener<IElement> loadListener) {
  42         super(canvas, resource);
  43         this.diagram = diagram;
  44         this.loadListener = loadListener;
  45     }
  46
  47     @Override
  48     public void perform(AsyncReadGraph graph, final AsyncProcedure<IElement> procedure) {
  49         // Keep this code from crashing the whole DB client by unexpected
  50         // throwing of NPE's somewhere in the following code that leads to
  51         // procedure not getting called properly.
  52         if (diagram == null) {
  53             procedure.exception(graph, new NullPointerException("null diagram specified for resource " + data));
  54             return;
  55         }
  56
  57 //        System.out.println("NodeRequest2 " + data);
  58 //        graph.asyncRequest(new SafeName(data), new Procedure<String>() {
  59 //            @Override
  60 //            public void exception(Throwable t) {
  61 //            }
  62 //            @Override
  63 //            public void execute(String result) {
  64 //                System.out.println("NodeRequest2 "  + result);
  65 //            }
  66 //        });
  67
  68         final ErrorHandler eh = ElementFactoryUtil.getErrorHandler(diagram);
  69
  70         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {
  71
  72             @Override
  73             public void exception(AsyncReadGraph graph, Throwable throwable) {
  74                 eh.error("NodeRequest.forHasStatement failed", throwable);
  75                 procedure.execute(graph, null);
  76             }
  77
  78             @Override
  79             public void execute(AsyncReadGraph graph, Boolean result) {
  80
  81                 if(!result) {
  82                     procedure.execute(graph, null);
  83                     return;
  84                 }
  85
  86                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {
  87
  88                     @Override
  89                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  90                         eh.error("NodeRequest.asyncRequest(Adapter<ElementFactory>) failed", throwable);
  91                         procedure.execute(graph, null);
  92                     }
  93
  94                     @Override
  95                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {
  96
  97 //                        graph.asyncRequest(new ResourceToURI(data), new Procedure<String>() {
  98 //                            @Override
  99 //                            public void exception(Throwable t) {
 100 //                            }
 101 //                            @Override
 102 //                            public void execute(String result) {
 103 //                                System.out.println("NodeRequest2 factory for "  + result + " -> " + factory);
 104 //                            }
 105 //                        });
 106
 107                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {
 108
 109                             @Override
 110                             public void exception(AsyncReadGraph graph, Throwable throwable) {
 111                                 LOGGER.error("Unexpected error in GetElementClassRequest", throwable);
 112                                 procedure.execute(graph, null);
 113                             }
 114
 115                             @Override
 116                             public void execute(AsyncReadGraph graph, ElementClass mutableClazz) {
 117                                 List<SubstituteElementClass> substitutes = diagram.getDiagramClass().getItemsByClass(SubstituteElementClass.class);
 118                                 for (SubstituteElementClass subs : substitutes) {
 119                                     mutableClazz = subs.substitute(diagram, mutableClazz);
 120                                 }
 121                                 final ElementClass clazz = mutableClazz;
 122                                 graph.asyncRequest(new SpawnRequest(canvas, clazz, data), new TransientCacheAsyncListener<IElement>() {
 123
 124                                     @Override
 125                                     public void exception(AsyncReadGraph graph, Throwable throwable) {
 126                                         LOGGER.error("Unexpected error in SpawnRequest", throwable);
 127                                         procedure.execute(graph, null);
 128                                     }
 129
 130                                     @Override
 131                                     public void execute(AsyncReadGraph graph, IElement element) {
 132                                         procedure.execute(graph, element);
 133
 134                                         if (loadListener != null) {
 135                                             //System.out.println("LoadRequest[" + (loadCounter++) + "] for " + data + ": " + element);
 136                                             graph.asyncRequest(new LoadRequest(canvas, diagram, factory, clazz, data), loadListener);
 137                                         } else {
 138                                             //System.out.println("Spawn[" + (spawnCounter++) + "] for " + data + ": " + element);
 139                                             factory.load(graph, canvas, diagram, data, element, new AsyncProcedure<IElement>() {
 140                                                 @Override
 141                                                 public void exception(AsyncReadGraph graph, Throwable throwable) {
 142                                                     LOGGER.error("Unexpected error in ElementFactory.load (factory=" + factory + ")", throwable);
 143                                                 }
 144                                                 @Override
 145                                                 public void execute(AsyncReadGraph graph, IElement result) {
 146                                                     // Loading complete, don't care.
 147                                                 }
 148                                             });
 149                                         }
 150                                     }
 151
 152                                 });
 153
 154                             }
 155
 156                         });
 157
 158 //                        graph.asyncRequest(new SafeName(data), new Procedure<String>() {
 159 //                            @Override
 160 //                            public void exception(Throwable t) {
 161 //                            }
 162 //                            @Override
 163 //                            public void execute(String result) {
 164 //                                System.out.println("NodeRequest2 factory "  + result + " " + factory.getClass().getName());
 165 //                            }
 166 //                        });
 167
 168                     }
 169
 170                 });
 171
 172             }
 173
 174         });
 175
 176     }
 177
 178     static int loadCounter = 0;
 179     static int spawnCounter = 0;
 180
 181 }