]> gerrit.simantics Code Review - simantics/platform.git/blob - bundles/org.simantics.spreadsheet.graph/src/org/simantics/spreadsheet/graph/SheetLines.java
First step to enable reading of cache when not writing
[simantics/platform.git] / 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 }