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