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