1 /*******************************************************************************
2 * Copyright (c) 2010 Association for Decentralized Information Management in
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
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.databoard.binding.reflection;
14 import org.simantics.databoard.binding.Binding;
15 import org.simantics.databoard.binding.UnionBinding;
16 import org.simantics.databoard.binding.error.BindingException;
17 import org.simantics.databoard.type.UnionType;
20 * This class binds a java Enum-class with DataBoard's UnionType.
23 * @author Toni Kalajainen
25 public class EnumClassBinding extends UnionBinding {
30 public EnumClassBinding(UnionType type, Class<Enum<?>> clazz) {
32 this.tags = clazz.getEnumConstants();
35 componentBindings = new Binding[ tags.length ];
36 for (int i=0; i<tags.length; i++) {
37 componentBindings[i] = new ConstantBinding(type.components[i].type, tags[i]);
42 public Object create(int tag, Object value) {
47 public void setValue(Object union, int tag, Object value)
48 throws BindingException {
49 throw new BindingException("Cannot change enum instance value");
53 public int getTag(Object obj) throws BindingException {
54 for (int i=0; i<tags.length; i++)
55 if (obj==tags[i]) return i;
56 throw new BindingException(obj+" is not an element of "+clazz.getSimpleName());
60 public Object getValue(Object obj) {
65 public boolean isInstance(Object obj) {
66 return clazz.isInstance(obj);
70 public boolean isImmutable() {
75 protected boolean baseEquals(Object obj) {
76 EnumClassBinding o = (EnumClassBinding)obj;
77 return super.baseEquals(obj) && o.clazz.equals(clazz);
81 public int baseHashCode() {
82 return super.baseHashCode() + 13 * clazz.hashCode();