bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/RelationUtils.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.util;
  13
  14 import org.simantics.db.Resource;
  15 import org.simantics.db.WriteGraph;
  16 import org.simantics.db.exception.DatabaseException;
  17 import org.simantics.layer0.Layer0;
  18
  19 /**
  20  * TODO: is this useful? Doesn't seem to be used.
  21  */
  22 public class RelationUtils {
  23
  24         public static Resource[] createRelation(WriteGraph g, String name, String inverseName, Resource baseRelation) throws DatabaseException {
  25                 Layer0 b = Layer0.getInstance(g);
  26                 Resource newRelation = g.newResource();
  27                 g.claim(newRelation, b.SubrelationOf, baseRelation);
  28                 if(name != null)
  29                         g.claimLiteral(newRelation,b.HasName, name);
  30                 Resource newInverse = g.newResource();
  31                 g.claim(newInverse, b.SubrelationOf, g.getInverse(baseRelation));
  32                 g.claim(newRelation, b.InverseOf, newInverse);
  33                 if (inverseName != null)
  34                         g.claimLiteral(newInverse, b.HasName,inverseName);
  35
  36                 return new Resource[] {newRelation, newInverse};
  37         }
  38
  39 }