bundles/org.simantics.modeling.template2d.ui/src/org/simantics/modeling/template2d/ui/actions/FixLinkedList.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012 Association for Decentralized Information Management in
   3  * 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.modeling.template2d.ui.actions;
  13
  14 import java.util.Collection;
  15 import java.util.HashSet;
  16 import java.util.List;
  17 import java.util.Set;
  18
  19 import org.simantics.Simantics;
  20 import org.simantics.db.Resource;
  21 import org.simantics.db.WriteGraph;
  22 import org.simantics.db.common.request.ObjectsWithType;
  23 import org.simantics.db.common.request.WriteRequest;
  24 import org.simantics.db.common.utils.ListUtils;
  25 import org.simantics.db.exception.DatabaseException;
  26 import org.simantics.db.layer0.adapter.ActionFactory;
  27 import org.simantics.db.layer0.util.RemoverUtil;
  28 import org.simantics.layer0.Layer0;
  29 import org.simantics.scenegraph.ontology.ScenegraphResources;
  30
  31 public class FixLinkedList implements ActionFactory {
  32
  33     @Override
  34     public Runnable create(Object target) {
  35         if(!(target instanceof Resource))
  36             return null;
  37         final Resource parent = (Resource)target;
  38
  39         return new Runnable() {
  40             @Override
  41             public void run() {
  42                 Simantics.getSession().asyncRequest(new WriteRequest() {
  43                     @Override
  44                     public void perform(WriteGraph g) throws DatabaseException {
  45                         g.markUndoPoint();
  46                         Layer0 L0 = Layer0.getInstance(g);
  47                         ScenegraphResources SG = ScenegraphResources.getInstance(g);
  48
  49                         Collection<Resource> consist = g.syncRequest(new ObjectsWithType(parent, L0.ConsistsOf, SG.Node));
  50
  51                         Resource list = g.getPossibleObject(parent, SG.Node_children);
  52                         if (list != null) {
  53                             try {
  54                                 List<Resource> children = ListUtils.toList(g, list);
  55                                 Set<Resource> childSet = new HashSet<Resource>(children);
  56                                 Set<Resource> consistSet = new HashSet<Resource>(consist);
  57                                 if (childSet.equals(consistSet)) {
  58                                     return;
  59                                 }
  60                             } catch (DatabaseException e) {
  61                             }
  62
  63                             // List is invalid, recreate it.
  64                             RemoverUtil.remove(g, list);
  65                             g.deny(parent, SG.Node_children);
  66                             list = ListUtils.create(g, consist);
  67                             g.claim(parent, SG.Node_children, list);
  68
  69                         } else {
  70                             // No list at all - create one from children.
  71                             list = ListUtils.create(g, consist);
  72                             g.claim(parent, SG.Node_children, list);
  73                         }
  74                     }
  75                 });
  76             }
  77         };
  78     }
  79 }