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 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.db.procedure.Listener;
  20 import org.simantics.diagram.synchronization.ErrorHandler;
  21 import org.simantics.g2d.canvas.ICanvasContext;
  22 import org.simantics.g2d.diagram.IDiagram;
  23 import org.simantics.g2d.element.ElementClass;
  24 import org.simantics.g2d.element.IElement;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 /**
  29  * @author Antti Villberg
  30  */
  31 public class NodeRequest extends BaseRequest2<Resource, IElement> {
  32
  33     private static final Logger LOGGER = LoggerFactory.getLogger(NodeRequest.class);
  34
  35     final IDiagram diagram;
  36     final Listener<IElement> loadListener;
  37
  38     public NodeRequest(ICanvasContext canvas, IDiagram diagram, Resource resource, Listener<IElement> loadListener) {
  39         super(canvas, resource);
  40         this.diagram = diagram;
  41         this.loadListener = loadListener;
  42     }
  43
  44     @Override
  45     public void perform(AsyncReadGraph graph, final AsyncProcedure<IElement> procedure) {
  46         // Keep this code from crashing the whole DB client by unexpected
  47         // throwing of NPE's somewhere in the following code that leads to
  48         // procedure not getting called properly.
  49         if (diagram == null) {
  50             procedure.exception(graph, new NullPointerException("null diagram specified for resource " + data));
  51             return;
  52         }
  53
  54 //        System.out.println("NodeRequest2 " + data);
  55 //        graph.asyncRequest(new SafeName(data), new Procedure<String>() {
  56 //            @Override
  57 //            public void exception(Throwable t) {
  58 //            }
  59 //            @Override
  60 //            public void execute(String result) {
  61 //                System.out.println("NodeRequest2 "  + result);
  62 //            }
  63 //        });
  64
  65         final ErrorHandler eh = ElementFactoryUtil.getErrorHandler(diagram);
  66
  67         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {
  68
  69             @Override
  70             public void exception(AsyncReadGraph graph, Throwable throwable) {
  71                 eh.error("NodeRequest.forHasStatement failed", throwable);
  72                 procedure.execute(graph, null);
  73             }
  74
  75             @Override
  76             public void execute(AsyncReadGraph graph, Boolean result) {
  77
  78                 if(!result) {
  79                     procedure.execute(graph, null);
  80                     return;
  81                 }
  82
  83                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {
  84
  85                     @Override
  86                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  87                         eh.error("NodeRequest.asyncRequest(Adapter<ElementFactory>) failed", throwable);
  88                         procedure.execute(graph, null);
  89                     }
  90
  91                     @Override
  92                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {
  93
  94 //                        graph.asyncRequest(new ResourceToURI(data), new Procedure<String>() {
  95 //                            @Override
  96 //                            public void exception(Throwable t) {
  97 //                            }
  98 //                            @Override
  99 //                            public void execute(String result) {
 100 //                                System.out.println("NodeRequest2 factory for "  + result + " -> " + factory);
 101 //                            }
 102 //                        });
 103
 104                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {
 105
 106                             @Override
 107                             public void exception(AsyncReadGraph graph, Throwable throwable) {
 108                                 LOGGER.error("Unexpected error in GetElementClassRequest", throwable);
 109                                 procedure.execute(graph, null);
 110                             }
 111
 112                             @Override
 113                             public void execute(AsyncReadGraph graph, final ElementClass clazz) {
 114
 115                                 graph.asyncRequest(new SpawnRequest(canvas, clazz, data), new TransientCacheAsyncListener<IElement>() {
 116
 117                                     @Override
 118                                     public void exception(AsyncReadGraph graph, Throwable throwable) {
 119                                         LOGGER.error("Unexpected error in SpawnRequest", throwable);
 120                                         procedure.execute(graph, null);
 121                                     }
 122
 123                                     @Override
 124                                     public void execute(AsyncReadGraph graph, IElement element) {
 125                                         procedure.execute(graph, element);
 126
 127                                         if (loadListener != null) {
 128                                             //System.out.println("LoadRequest[" + (loadCounter++) + "] for " + data + ": " + element);
 129                                             graph.asyncRequest(new LoadRequest(canvas, diagram, factory, clazz, data), loadListener);
 130                                         } else {
 131                                             //System.out.println("Spawn[" + (spawnCounter++) + "] for " + data + ": " + element);
 132                                             factory.load(graph, canvas, diagram, data, element, new AsyncProcedure<IElement>() {
 133                                                 @Override
 134                                                 public void exception(AsyncReadGraph graph, Throwable throwable) {
 135                                                     LOGGER.error("Unexpected error in ElementFactory.load (factory=" + factory + ")", throwable);
 136                                                 }
 137                                                 @Override
 138                                                 public void execute(AsyncReadGraph graph, IElement result) {
 139                                                     // Loading complete, don't care.
 140                                                 }
 141                                             });
 142                                         }
 143                                     }
 144
 145                                 });
 146
 147                             }
 148
 149                         });
 150
 151 //                        graph.asyncRequest(new SafeName(data), new Procedure<String>() {
 152 //                            @Override
 153 //                            public void exception(Throwable t) {
 154 //                            }
 155 //                            @Override
 156 //                            public void execute(String result) {
 157 //                                System.out.println("NodeRequest2 factory "  + result + " " + factory.getClass().getName());
 158 //                            }
 159 //                        });
 160
 161                     }
 162
 163                 });
 164
 165             }
 166
 167         });
 168
 169     }
 170
 171     static int loadCounter = 0;
 172     static int spawnCounter = 0;
 173
 174 }