bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/VariableFactoryRequest.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.layer0.request;\r
  13 \r
  14 import java.util.Collection;\r
  15 \r
  16 import org.simantics.db.ReadGraph;\r
  17 import org.simantics.db.common.request.BinaryRead;\r
  18 import org.simantics.db.exception.AssumptionException;\r
  19 import org.simantics.db.exception.DatabaseException;\r
  20 import org.simantics.db.layer0.variable.Variable;\r
  21 import org.simantics.db.layer0.variable.VariableFactory;\r
  22 \r
  23 public class VariableFactoryRequest extends BinaryRead<Variable, VariableFactory, Collection<Variable>> {\r
  24 \r
  25     public VariableFactoryRequest(Variable variable, VariableFactory factory) {\r
  26         super(variable, factory);\r
  27         assert(variable != null);\r
  28         assert(factory != null);\r
  29     }\r
  30 \r
  31     @Override\r
  32     public Collection<Variable> perform(ReadGraph graph) throws DatabaseException {\r
  33         Collection<Variable> result = parameter2.evaluate(graph, parameter);\r
  34         if(result == null) throw new AssumptionException("VariableFactory should not return null."); \r
  35         return result;\r
  36     }\r
  37 \r
  38 }\r