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