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