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

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