bundles/org.simantics.db.common/src/org/simantics/db/common/request/PossibleStatementWithNamedPredicate.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.common.request;
  13
  14 import org.simantics.db.ReadGraph;
  15 import org.simantics.db.Resource;
  16 import org.simantics.db.Statement;
  17 import org.simantics.db.exception.DatabaseException;
  18 import org.simantics.layer0.Layer0;
  19
  20 final public class PossibleStatementWithNamedPredicate extends TernaryRead<Resource, Resource, String, Statement> {
  21
  22     public PossibleStatementWithNamedPredicate(Resource resource, Resource predicate, String name) {
  23         super(resource, predicate, name);
  24     }
  25
  26     @Override
  27     public Statement perform(ReadGraph graph) throws DatabaseException {
  28         Layer0 b = Layer0.getInstance(graph);
  29         Statement result = null;
  30         for(Resource predicate : graph.getPredicates(parameter)) {
  31                 if(graph.isSubrelationOf(predicate, parameter2)) {
  32                 String name = graph.getPossibleRelatedValue(predicate, b.HasName);
  33                 if(parameter3.equals(name)) {
  34                     if(result != null) return null;
  35                     result = graph.getPossibleStatement(parameter, predicate);
  36                 }
  37                 }
  38         }
  39         return result;
  40     }
  41
  42 }