1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.lang.enums;
18
19 import java.util.Iterator;
20 import java.util.List;
21 import java.util.Map;
22
23 /**
24 * Operator enumeration.
25 *
26 * @author Stephen Colebourne
27 * @version $Id: OperationEnum.java 437554 2006-08-28 06:21:41Z bayard $
28 */
29 public abstract class OperationEnum extends Enum {
30 // This syntax works for JDK 1.3 and upwards:
31 // public static final OperationEnum PLUS = new OperationEnum("Plus") {
32 // public int eval(int a, int b) {
33 // return (a + b);
34 // }
35 // };
36 // public static final OperationEnum MINUS = new OperationEnum("Minus") {
37 // public int eval(int a, int b) {
38 // return (a - b);
39 // }
40 // };
41 // This syntax works for JDK 1.2 and upwards:
42 public static final OperationEnum PLUS = new PlusOperation();
43 private static class PlusOperation extends OperationEnum {
44 private PlusOperation() {
45 super("Plus");
46 }
47 public int eval(int a, int b) {
48 return (a + b);
49 }
50 }
51 public static final OperationEnum MINUS = new MinusOperation();
52 private static class MinusOperation extends OperationEnum {
53 private MinusOperation() {
54 super("Minus");
55 }
56 public int eval(int a, int b) {
57 return (a - b);
58 }
59 }
60
61 private OperationEnum(String name) {
62 super(name);
63 }
64
65 public final Class getEnumClass() {
66 return OperationEnum.class;
67 }
68
69 public abstract int eval(int a, int b);
70
71 public static OperationEnum getEnum(String name) {
72 return (OperationEnum) getEnum(OperationEnum.class, name);
73 }
74
75 public static Map getEnumMap() {
76 return getEnumMap(OperationEnum.class);
77 }
78
79 public static List getEnumList() {
80 return getEnumList(OperationEnum.class);
81 }
82
83 public static Iterator iterator() {
84 return iterator(OperationEnum.class);
85 }
86 }