bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/LinkedIndexRoots.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.db.layer0.request;
  13
  14 import java.util.HashSet;
  15 import java.util.Set;
  16
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.common.request.ObjectsWithType;
  20 import org.simantics.db.common.request.ResourceRead;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.layer0.Layer0;
  23
  24 public class LinkedIndexRoots extends ResourceRead<Set<Resource>> {
  25
  26     public LinkedIndexRoots(Resource indexRoot) {
  27         super(indexRoot);
  28     }
  29
  30     @Override
  31     public Set<Resource> perform(ReadGraph graph) throws DatabaseException {
  32
  33         Layer0 L0 = Layer0.getInstance(graph);
  34
  35         HashSet<Resource> result = new HashSet<Resource>();
  36         result.add(resource);
  37         for(Resource link : graph.sync(new ObjectsWithType(resource, L0.IsLinkedTo, L0.IndexRoot))) {
  38                 result.addAll(graph.sync(new LinkedIndexRoots(link)));
  39         }
  40         return result;
  41
  42     }
  43
  44 }