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