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[simantics/platform.git] / bundles / org.simantics.spreadsheet.graph / src / org / simantics / spreadsheet / graph / parser / ast / AstNothing.java
1 /*******************************************************************************\r
2  *  Copyright (c) 2010 Association for Decentralized Information Management in\r
3  *  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.parser.ast;\r
13 \r
14 import java.io.Serializable;\r
15 \r
16 public class AstNothing implements AstValue {
17         \r
18         private static final long serialVersionUID = 4968570232015650370L;\r
19         \r
20         public static final AstNothing INSTANCE = new AstNothing();\r
21         public static final Serializable NOTHING = new Serializable() {\r
22                 private static final long serialVersionUID = -3704142714710129215L;\r
23         };\r
24         
25         @Override
26         public <T> T accept(AstValueVisitor<T> v) {
27                 return v.visit(this);
28         }
29 }