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Java > Open Source Codes > org > apache > commons > lang > enum > NestReferenced


1 /*
2  * Copyright 2002-2005 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.lang.enum;
17
18 import java.util.Iterator;
19 import java.util.List;
20 import java.util.Map;
21
22 /**
23  * Color enumeration which demonstrates how to provide a view of the constants
24  * in a different class to the Enum. This technique is the safest, however it
25  * is obviously inconvenient as it involves defining two sets of constants.
26  * See NestedLinked for an alternative.
27  *
28  * @author Stephen Colebourne
29  * @version $Id: NestReferenced.java 161244 2005-04-14 06:16:36Z ggregory $
30  */
31
32 public final class NestReferenced {
33     
34     public static final ColorEnum RED = ColorEnum.RED;
35     public static final ColorEnum GREEN = ColorEnum.GREEN;
36     public static final ColorEnum BLUE = ColorEnum.BLUE;
37     
38     public NestReferenced() {
39         super();
40     }
41     
42     public static final class ColorEnum extends Enum {
43
44         // must be defined here, not just in outer class
45 private static final ColorEnum RED = new ColorEnum("Red");
46         private static final ColorEnum GREEN = new ColorEnum("Green");
47         private static final ColorEnum BLUE = new ColorEnum("Blue");
48         
49         private ColorEnum(String color) {
50             super(color);
51         }
52
53         public static ColorEnum getEnum(String color) {
54             return (ColorEnum) getEnum(ColorEnum.class, color);
55         }
56
57         public static Map getEnumMap() {
58             return getEnumMap(ColorEnum.class);
59         }
60
61         public static List getEnumList() {
62             return getEnumList(ColorEnum.class);
63         }
64
65         public static Iterator iterator() {
66             return iterator(ColorEnum.class);
67         }
68     }
69 }
70
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