bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/ConnectionRequest.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 ConnectionRequest extends BaseRequest2<Resource, IElement> {\r
  30 \r
  31     final IDiagram diagram;\r
  32     final Listener<IElement> loadListener;\r
  33     final ErrorHandler errorHandler;\r
  34 \r
  35     public ConnectionRequest(ICanvasContext canvas, IDiagram diagram, Resource resource, ErrorHandler errorHandler, Listener<IElement> loadListener) {\r
  36         super(canvas, resource);\r
  37         this.diagram = diagram;\r
  38         this.errorHandler = errorHandler;\r
  39         this.loadListener = loadListener;\r
  40     }\r
  41 \r
  42     @Override\r
  43     public void perform(AsyncReadGraph graph, final AsyncProcedure<IElement> procedure) {\r
  44 \r
  45         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {\r
  46 \r
  47             @Override\r
  48             public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  49                 procedure.exception(graph, throwable);\r
  50             }\r
  51 \r
  52             @Override\r
  53             public void execute(AsyncReadGraph graph, Boolean result) {\r
  54 \r
  55                 if (!result) {\r
  56                     procedure.execute(graph, null);\r
  57                     return;\r
  58                 }\r
  59 \r
  60                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {\r
  61 \r
  62                     @Override\r
  63                     public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  64                         errorHandler.error("Unexpected ElementFactory adaption failure", throwable);\r
  65                         procedure.execute(graph, null);\r
  66                     }\r
  67 \r
  68                     @Override\r
  69                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {\r
  70 \r
  71                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {\r
  72 \r
  73                             @Override\r
  74                             public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  75                                 errorHandler.error("Unexpected ElementClass creation failure", throwable);\r
  76                                 procedure.execute(graph, null);\r
  77                             }\r
  78 \r
  79                             @Override\r
  80                             public void execute(AsyncReadGraph graph, final ElementClass ec) {\r
  81 \r
  82                                 graph.asyncRequest(new SpawnRequest(canvas, ec, data), new TransientCacheAsyncListener<IElement>() {\r
  83 \r
  84                                     @Override\r
  85                                     public void exception(AsyncReadGraph graph, Throwable throwable) {\r
  86                                         errorHandler.error("Unexpected SpawnRequest failure", throwable);\r
  87                                         procedure.execute(graph, null);\r
  88                                     }\r
  89 \r
  90                                     @Override\r
  91                                     public void execute(AsyncReadGraph graph, IElement element) {\r
  92 \r
  93                                         procedure.execute(graph, element);\r
  94 \r
  95                                         if (loadListener != null) {\r
  96                                             //System.out.println("LoadRequest[" + (loadCounter++) + "] for " + data + ": " + element);\r
  97                                             graph.asyncRequest(new LoadRequest(canvas, diagram, factory, ec, data), loadListener);\r
  98                                         } else {\r
  99                                             //System.out.println("Spawn[" + (spawnCounter++) + "] for " + data + ": " + element);\r
 100                                             factory.load(graph, canvas, diagram, data, element, new AsyncProcedure<IElement>() {\r
 101                                                 @Override\r
 102                                                 public void exception(AsyncReadGraph graph, Throwable throwable) {\r
 103                                                     errorHandler.error("Unexpected ElementFactory.load failure", throwable);\r
 104                                                 }\r
 105                                                 @Override\r
 106                                                 public void execute(AsyncReadGraph graph, IElement result) {\r
 107                                                     // Loading complete, don't care.\r
 108                                                 }\r
 109                                             });\r
 110                                         }\r
 111                                     }\r
 112                                 });\r
 113                             }\r
 114                         });\r
 115                     }\r
 116                 });\r
 117             }\r
 118         });\r
 119     }\r
 120 \r
 121 }\r