bundles/org.simantics.spreadsheet.graph/src/org/simantics/spreadsheet/graph/SheetLines.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.spreadsheet.graph;
  13
  14 import java.util.Collection;
  15 import java.util.Collections;
  16
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.exception.DatabaseException;
  19 import org.simantics.db.layer0.request.VariableRead;
  20 import org.simantics.db.layer0.variable.Variable;
  21
  22 public class SheetLines extends VariableRead<Collection<Variable>> {
  23
  24     public SheetLines(Variable variable) {
  25         super(variable);
  26     }
  27
  28     @Override
  29     public Collection<Variable> perform(ReadGraph graph) throws DatabaseException {
  30         Variable lines = variable.getPossibleChild(graph, "Lines");
  31         if(lines == null) return Collections.emptyList();
  32
  33         return graph.syncRequest(new Lines(lines));
  34     }
  35
  36 }