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