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

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2014 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 org.simantics.db.ReadGraph;
  15 import org.simantics.db.Resource;
  16 import org.simantics.db.common.request.ResourceRead;
  17 import org.simantics.db.exception.DatabaseException;
  18 import org.simantics.db.layer0.variable.Variable;
  19 import org.simantics.db.layer0.variable.Variables;
  20
  21 public class PossibleActiveVariableFromResource extends ResourceRead<Variable> {
  22
  23     public PossibleActiveVariableFromResource(Resource configurationResource) {
  24         super(configurationResource);
  25     }
  26
  27     @Override
  28     public Variable perform(ReadGraph graph) throws DatabaseException {
  29         Variable v = Variables.getPossibleVariable(graph, resource);
  30         return v != null ? graph.sync(new PossibleActiveVariableFromVariable(v)) : null;
  31     }
  32
  33 }