bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/queries/IsNodeContextRemovable.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2015 Association for Decentralized Information Management\r
   3  * in 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  *     Semantum Oy - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.browsing.ui.model.queries;\r
  13 \r
  14 import java.util.Collections;\r
  15 \r
  16 import org.simantics.browsing.ui.BuiltinKeys;\r
  17 import org.simantics.browsing.ui.NodeContext;\r
  18 import org.simantics.browsing.ui.model.actions.ActionBrowseContext;\r
  19 import org.simantics.browsing.ui.model.browsecontexts.ActionBrowseContextRequest;\r
  20 import org.simantics.db.ReadGraph;\r
  21 import org.simantics.db.Resource;\r
  22 import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;\r
  23 import org.simantics.db.common.request.Queries;\r
  24 import org.simantics.db.common.request.UnaryRead;\r
  25 import org.simantics.db.exception.DatabaseException;\r
  26 import org.simantics.db.layer0.adapter.Remover;\r
  27 import org.simantics.project.ontology.ProjectResource;\r
  28 \r
  29 /**\r
  30  * @author Tuukka Lehtonen\r
  31  * @since 1.18.1\r
  32  */\r
  33 public class IsNodeContextRemovable extends UnaryRead<NodeContext, Boolean> {\r
  34 \r
  35     public IsNodeContextRemovable(NodeContext context) {\r
  36         super(context);\r
  37     }\r
  38 \r
  39     @Override\r
  40     public Boolean perform(ReadGraph graph) throws DatabaseException {\r
  41         boolean result = false;\r
  42         try {\r
  43             ActionBrowseContext defaultContext = graph.syncRequest(\r
  44                     new ActionBrowseContextRequest(Collections.singleton(ProjectResource.getInstance(graph).ProjectActionContext)),\r
  45                     TransientCacheAsyncListener.<ActionBrowseContext>instance());\r
  46             ActionBrowseContext browseContext = ActionBrowseContext.get(graph, parameter, defaultContext);\r
  47             if (browseContext != null && !browseContext.canRemove(graph, parameter))\r
  48                 return false;\r
  49             result = true;\r
  50         } catch (DatabaseException e) {\r
  51             return false;\r
  52         }\r
  53 \r
  54         Object input = parameter.getConstant(BuiltinKeys.INPUT);\r
  55         if (result && input instanceof Resource) {\r
  56             Remover remover = graph.syncRequest(Queries.adapt((Resource) input, Remover.class, true));\r
  57             if (remover != null)\r
  58                 return remover.canRemove(graph, null) == null;\r
  59         }\r
  60         return result;\r
  61     }\r
  62 \r
  63 }\r