bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/LinkedIndexRoots.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 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  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.db.layer0.request;\r
  13 \r
  14 import java.util.HashSet;\r
  15 import java.util.Set;\r
  16 \r
  17 import org.simantics.db.ReadGraph;\r
  18 import org.simantics.db.Resource;\r
  19 import org.simantics.db.common.request.ObjectsWithType;\r
  20 import org.simantics.db.common.request.ResourceRead;\r
  21 import org.simantics.db.exception.DatabaseException;\r
  22 import org.simantics.layer0.Layer0;\r
  23 \r
  24 public class LinkedIndexRoots extends ResourceRead<Set<Resource>> {\r
  25 \r
  26     public LinkedIndexRoots(Resource indexRoot) {\r
  27         super(indexRoot);\r
  28     }\r
  29 \r
  30     @Override\r
  31     public Set<Resource> perform(ReadGraph graph) throws DatabaseException {\r
  32 \r
  33         Layer0 L0 = Layer0.getInstance(graph);\r
  34 \r
  35         HashSet<Resource> result = new HashSet<Resource>();\r
  36         result.add(resource);\r
  37         for(Resource link : graph.sync(new ObjectsWithType(resource, L0.IsLinkedTo, L0.IndexRoot))) {\r
  38                 result.addAll(graph.sync(new LinkedIndexRoots(link)));\r
  39         }\r
  40         return result;\r
  41 \r
  42     }\r
  43 \r
  44 }\r