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 java.util.List;
  15
  16 import org.simantics.db.AsyncReadGraph;
  17 import org.simantics.db.Resource;
  18 import org.simantics.db.common.primitiverequest.Adapter;
  19 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
  20 import org.simantics.db.procedure.AsyncProcedure;
  21 import org.simantics.db.procedure.Listener;
  22 import org.simantics.diagram.synchronization.ErrorHandler;
  23 import org.simantics.g2d.canvas.ICanvasContext;
  24 import org.simantics.g2d.diagram.IDiagram;
  25 import org.simantics.g2d.diagram.handler.SubstituteElementClass;
  26 import org.simantics.g2d.element.ElementClass;
  27 import org.simantics.g2d.element.IElement;
  28
  29 /**
  30  * @author Antti Villberg
  31  */
  32 public class ConnectionRequest extends BaseRequest2<Resource, IElement> {
  33
  34     final IDiagram diagram;
  35     final Listener<IElement> loadListener;
  36     final ErrorHandler errorHandler;
  37
  38     public ConnectionRequest(ICanvasContext canvas, IDiagram diagram, Resource resource, ErrorHandler errorHandler, Listener<IElement> loadListener) {
  39         super(canvas, resource);
  40         this.diagram = diagram;
  41         this.errorHandler = errorHandler;
  42         this.loadListener = loadListener;
  43     }
  44
  45     @Override
  46     public void perform(AsyncReadGraph graph, final AsyncProcedure<IElement> procedure) {
  47
  48         graph.forHasStatement(data, new AsyncProcedure<Boolean>() {
  49
  50             @Override
  51             public void exception(AsyncReadGraph graph, Throwable throwable) {
  52                 procedure.exception(graph, throwable);
  53             }
  54
  55             @Override
  56             public void execute(AsyncReadGraph graph, Boolean result) {
  57
  58                 if (!result) {
  59                     procedure.execute(graph, null);
  60                     return;
  61                 }
  62
  63                 graph.asyncRequest(new Adapter<ElementFactory>(data, ElementFactory.class), new TransientCacheAsyncListener<ElementFactory>() {
  64
  65                     @Override
  66                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  67                         errorHandler.error("Unexpected ElementFactory adaption failure", throwable);
  68                         procedure.execute(graph, null);
  69                     }
  70
  71                     @Override
  72                     public void execute(AsyncReadGraph graph, final ElementFactory factory) {
  73
  74                         graph.asyncRequest(new GetElementClassRequest(factory, data, canvas, diagram), new TransientCacheAsyncListener<ElementClass>() {
  75
  76                             @Override
  77                             public void exception(AsyncReadGraph graph, Throwable throwable) {
  78                                 errorHandler.error("Unexpected ElementClass creation failure", throwable);
  79                                 procedure.execute(graph, null);
  80                             }
  81
  82                             @Override
  83                             public void execute(AsyncReadGraph graph, ElementClass mutableClazz) {
  84
  85                                 List<SubstituteElementClass> substitutes = diagram.getDiagramClass().getItemsByClass(SubstituteElementClass.class);
  86                                 for (SubstituteElementClass subs : substitutes) {
  87                                     mutableClazz = subs.substitute(diagram, mutableClazz);
  88                                 }
  89                                 final ElementClass ec = mutableClazz;
  90
  91                                 graph.asyncRequest(new SpawnRequest(canvas, ec, data), new TransientCacheAsyncListener<IElement>() {
  92
  93                                     @Override
  94                                     public void exception(AsyncReadGraph graph, Throwable throwable) {
  95                                         errorHandler.error("Unexpected SpawnRequest failure", throwable);
  96                                         procedure.execute(graph, null);
  97                                     }
  98
  99                                     @Override
 100                                     public void execute(AsyncReadGraph graph, IElement element) {
 101
 102                                         procedure.execute(graph, element);
 103
 104                                         if (loadListener != null) {
 105                                             //System.out.println("LoadRequest[" + (loadCounter++) + "] for " + data + ": " + element);
 106                                             graph.asyncRequest(new LoadRequest(canvas, diagram, factory, ec, data), loadListener);
 107                                         } else {
 108                                             //System.out.println("Spawn[" + (spawnCounter++) + "] for " + data + ": " + element);
 109                                             factory.load(graph, canvas, diagram, data, element, new AsyncProcedure<IElement>() {
 110                                                 @Override
 111                                                 public void exception(AsyncReadGraph graph, Throwable throwable) {
 112                                                     errorHandler.error("Unexpected ElementFactory.load failure", throwable);
 113                                                 }
 114                                                 @Override
 115                                                 public void execute(AsyncReadGraph graph, IElement result) {
 116                                                     // Loading complete, don't care.
 117                                                 }
 118                                             });
 119                                         }
 120                                     }
 121                                 });
 122                             }
 123                         });
 124                     }
 125                 });
 126             }
 127         });
 128     }
 129
 130 }