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[simantics/platform.git] / bundles / org.simantics.databoard / src / org / simantics / databoard / type / VariantType.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.databoard.type;
13
14 import java.util.Set;\r
15 \r
16 import org.simantics.databoard.accessor.error.ReferenceException;\r
17 import org.simantics.databoard.accessor.reference.ChildReference;\r
18 import org.simantics.databoard.util.IdentityPair;\r
19
20 public class VariantType extends Datatype {
21         
22         public VariantType() {          
23         }
24         \r
25     @Override\r
26     public int getComponentCount() {\r
27         return 0;\r
28     }\r
29     \r
30     @Override\r
31     public Datatype getComponentType(int index) {\r
32         throw new IllegalArgumentException();\r
33     }\r
34     \r
35     @Override\r
36     public Datatype getComponentType(ChildReference path) {\r
37         if (path==null) return this;\r
38         throw new IllegalArgumentException();\r
39     }\r
40         
41         @Override
42         protected boolean deepEquals(Object obj, Set<IdentityPair<Datatype, Datatype>> compareHistory) {
43                 if (this==obj) return true;\r
44                 if ( !hasEqualMetadata(obj) ) return false;\r
45                 return obj instanceof VariantType;              
46         }       
47         
48         @Override
49         public int hashCode() {
50                 return 192837465 + super.hashCode();
51         }
52                 
53     @Override
54     public <T> T accept(Visitor<T> v) {         
55         return v.visit(this);
56     }
57     
58     @Override
59     public void accept(Visitor1 v, Object obj) {
60             v.visit(this, obj);        
61     }
62     
63         @SuppressWarnings("unchecked")\r
64         @Override\r
65         public <T extends Datatype> T getChildType(ChildReference reference) throws ReferenceException {\r
66                 if (reference==null) return (T) this;           \r
67                 throw new ReferenceException("Cannot get variant type without instance");\r
68         }\r
69     
70
71 }
72