bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/NodeRequest.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.diagram.adapter;\r
  13 \r
  14 import org.simantics.db.AsyncReadGraph;\r
  15 import org.simantics.db.Resource;\r
  16 import org.simantics.db.common.primitiverequest.Adapter;\r
  17 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;\r
  18 import org.simantics.db.procedure.AsyncProcedure;\r
  19 import org.simantics.db.procedure.Listener;\r
  20 import org.simantics.diagram.synchronization.ErrorHandler;\r
  21 import org.simantics.g2d.canvas.ICanvasContext;\r
  22 import org.simantics.g2d.diagram.IDiagram;\r
  23 import org.simantics.g2d.element.ElementClass;\r
  24 import org.simantics.g2d.element.IElement;\r
  25 \r
  26 /**\r
  27  * @author Antti Villberg\r
  28  */\r
  29 public class NodeRequest extends BaseRequest2<Resource, IElement> {\r
  30 \r
  31     final IDiagram diagram;\r
  32     final Listener<IElement> loadListener;\r
  33 \r
  34     public NodeRequest(ICanvasContext canvas, IDiagram diagram, Resource resource, Listener<IElement> loadListener) {\r
  35         super(canvas, resource);\r
  36         this.diagram = diagram;\r
  37         this.loadListener = loadListener;\r
  38     }\r
  39 \r
  40     @Override\r
  41     public void perform(AsyncReadGraph graph, final AsyncProcedure<IElement> procedure) {\r
  42         // Keep this code from crashing the whole DB client by unexpected\r
  43         // throwing of NPE's somewhere in the following code that leads to\r
  44         // procedure not getting called properly.\r
  45         if (diagram == null) {\r
  46             procedure.exception(graph, new NullPointerException("null diagram specified for resource " + data));\r
  47             return;\r
  48         }\r
  49 \r
  50 //        System.out.println("NodeRequest2 " + data);\r
  51 //        graph.asyncRequest(new SafeName(data), new Procedure<String>() {\r
  52 //            @Override\r
  53 //            public void exception(Throwable t) {\r
  54 //            }\r
  55 //            @Override\r
  56 //            public void execute(String result) {\r
  57 //                System.out.println("NodeRequest2 "  + result);\r
  58 //            }\r
  59 //        });\r
  60 \r
  61         final ErrorHandler eh = ElementFactoryUtil.getErrorHandler(diagram);\r
  62 \r
  63         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {\r
  64 \r
  65             @Override\r
  66             public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  67                 eh.error("NodeRequest.forHasStatement failed", throwable);\r
  68                 procedure.execute(graph, null);\r
  69             }\r
  70 \r
  71             @Override\r
  72             public void execute(AsyncReadGraph graph, Boolean result) {\r
  73 \r
  74                 if(!result) {\r
  75                     procedure.execute(graph, null);\r
  76                     return;\r
  77                 }\r
  78 \r
  79                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {\r
  80 \r
  81                     @Override\r
  82                     public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  83                         eh.error("NodeRequest.asyncRequest(Adapter<ElementFactory>) failed", throwable);\r
  84                         procedure.execute(graph, null);\r
  85                     }\r
  86 \r
  87                     @Override\r
  88                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {\r
  89 \r
  90 //                        graph.asyncRequest(new ResourceToURI(data), new Procedure<String>() {\r
  91 //                            @Override\r
  92 //                            public void exception(Throwable t) {\r
  93 //                            }\r
  94 //                            @Override\r
  95 //                            public void execute(String result) {\r
  96 //                                System.out.println("NodeRequest2 factory for "  + result + " -> " + factory);\r
  97 //                            }\r
  98 //                        });\r
  99 \r
 100                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {\r
 101 \r
 102                             @Override\r
 103                             public void exception(AsyncReadGraph graph, Throwable throwable) {\r
 104                                 throwable.printStackTrace();\r
 105                                 procedure.execute(graph, null);\r
 106                             }\r
 107 \r
 108                             @Override\r
 109                             public void execute(AsyncReadGraph graph, final ElementClass clazz) {\r
 110 \r
 111                                 graph.asyncRequest(new SpawnRequest(canvas, clazz, data), new TransientCacheAsyncListener<IElement>() {\r
 112 \r
 113                                     @Override\r
 114                                     public void exception(AsyncReadGraph graph, Throwable throwable) {\r
 115                                         throwable.printStackTrace();\r
 116                                         procedure.execute(graph, null);\r
 117                                     }\r
 118 \r
 119                                     @Override\r
 120                                     public void execute(AsyncReadGraph graph, IElement element) {\r
 121                                         procedure.execute(graph, element);\r
 122 \r
 123                                         if (loadListener != null) {\r
 124                                             //System.out.println("LoadRequest[" + (loadCounter++) + "] for " + data + ": " + element);\r
 125                                             graph.asyncRequest(new LoadRequest(canvas, diagram, factory, clazz, data), loadListener);\r
 126                                         } else {\r
 127                                             //System.out.println("Spawn[" + (spawnCounter++) + "] for " + data + ": " + element);\r
 128                                             factory.load(graph, canvas, diagram, data, element, new AsyncProcedure<IElement>() {\r
 129                                                 @Override\r
 130                                                 public void exception(AsyncReadGraph graph, Throwable throwable) {\r
 131                                                     // TODO: proper logging\r
 132                                                     throwable.printStackTrace();\r
 133                                                 }\r
 134                                                 @Override\r
 135                                                 public void execute(AsyncReadGraph graph, IElement result) {\r
 136                                                     // Loading complete, don't care.\r
 137                                                 }\r
 138                                             });\r
 139                                         }\r
 140                                     }\r
 141 \r
 142                                 });\r
 143 \r
 144                             }\r
 145 \r
 146                         });\r
 147 \r
 148 //                        graph.asyncRequest(new SafeName(data), new Procedure<String>() {\r
 149 //                            @Override\r
 150 //                            public void exception(Throwable t) {\r
 151 //                            }\r
 152 //                            @Override\r
 153 //                            public void execute(String result) {\r
 154 //                                System.out.println("NodeRequest2 factory "  + result + " " + factory.getClass().getName());\r
 155 //                            }\r
 156 //                        });\r
 157 \r
 158                     }\r
 159 \r
 160                 });\r
 161 \r
 162             }\r
 163 \r
 164         });\r
 165 \r
 166     }\r
 167 \r
 168     static int loadCounter = 0;\r
 169     static int spawnCounter = 0;\r
 170 \r
 171 }\r