Java枚举类妙用

• 上代码：

1@Getter
2public enum NodeIdStatusRef {
3
4    /**
5     * reference
6     */
7    NI001_A001_AGREE(NodeIdEnum.NI001.getNodeId(), OrderStatus.A101.getCode(), OrderStatus.A101.getCode()),
8    NI001_A001_REJECT(NodeIdEnum.NI002.getNodeId(), OrderStatus.A102.getCode(), OrderStatus.A102.getCode()),
9    NI001_A002(NodeIdEnum.NI002.getNodeId(), OrderStatus.A102.getCode(), null),
10    ;
11
12    /**
13     * 节点ID
14     */
15    private String nodeId;
16    /**
17     * 审批通过对应的状态
18     */
19    private String agreeStatus;
20    /**
21     * 审批拒绝对应的状态
22     */
23    private String rejectStatus;
24
25    NodeIdStatusRef(String nodeId, String agreeStatus, String rejectStatus) {
26        this.nodeId = nodeId;
27        this.agreeStatus = agreeStatus;
28        this.rejectStatus = rejectStatus;
29    }
30
31    /**
32     * 操作类型
33     */
34    private String opType;
35
36    /**
37     * 根据nodeId和操作类型查对应状态
38     *
39     * @param nodeId 节点ID
40     * @param opType 操作类型
41     * @return 对应状态
42     */
43    public static String lookupStatusByOpType(String nodeId, String opType) {
44        String status = null;
45        for (NodeIdStatusRef item : NodeIdStatusRef.values()) {
46            if (nodeId.equals(item.getNodeId())) {
47                if (TopcarConstants.APPROVE_RESULT_CODE_AGREE.equals(opType)) {
48                    status = item.getAgreeStatus();
49                } else if (TopcarConstants.APPROVE_RESULT_CODE_REJECT.equals(opType)) {
50                    status = item.getRejectStatus();
51                }
52            }
53        }
54        return status;
55    }

这个类需要以下两个枚举类：用来做参照，上面这个枚举类的方法是做的参照，提供调用方法【lookupStatusByOpType（根据节点id和操作类型，返回对应状态）】，入参是操作类型和节点ID

1/**
2 * Notice: 节点ID枚举类
3 */
4@Getter
5@AllArgsConstructor
6public enum NodeIdEnum {
7    /**
8     * nodeId
9     */
10    NI001("TaskNode_d8lv3","资管公司初审"),
11    NI002("TaskNode_etu76","资管公司复审"),
12    NI003("TaskNode_hlmgj","国银初审"),
13    NI004("TaskNode_lftzv","国银复审"),
14    NI005("TaskNode_apqg5","资管公司请款初审"),
15    NI006("TaskNode_r2nxp","资管公司请款复审"),
16    NI007("TaskNode_bhbol","国银请款初审"),
17    NI008("TaskNode_s48j9","国银请款复审"),
18        ;
19    /**
20     * 节点ID
21     */
22    private String nodeId;
23    /**
24     * 描述
25     */
26    private String desc;
27}

1/**
2 * Notice: 订单状态
3 */
4@Getter
5@AllArgsConstructor
6public enum OrderStatus {
7	/**
8	 * 枚举定义
9	 */
10	A101("101", "等待风控报告"),
11	A102("102", "自动审批通过"),
12	A103("103", "自动审批拒绝"),
13	A104("104", "资管公司风控审批"),
14	A105("105", "国银风控审批"),
15	A106("106", "风控审批前取消"),
16	A107("107", "等待补充合同信息"),
17	A108("108", "风控审批后取消"),
18	A109("109", "等待客户签约"),
19	A110("110", "客户签约取消"),
20	A111("111", "等待渠道请款"),
21	A112("112", "资管公司请款审批"),
22	A113("113", "国银请款审批"),
23	A114("114", "请款取消"),
24	A115("115", "取消付款"),
25	A116("116", "风控前拒绝"),
26	A117("117", "风控后拒绝"),
27	;
28	private String code;
29	private String desc;
30}

枚举类转Map 参考[原文](http://fokman.iteye.com/blog/1568905)

1public enum IdeasCMD {  
2    RESERVED(0), PING(1), PING_ACK(2), KEY_EXCHANGE(3), KEY_EXCHANGE_ACK(4), CONNECT(5), CONNECT_ACK(6), DISCONNECT(7), KEEP_ALIVE(  
3            8), KEEP_ALIVE_ACK(9)   ;  
4  
5    private final int value;  
6  
7    /** 
8     * enum lookup map 
9     */  
10    private static final Map<Integer, IdeasCMD> lookup = new HashMap<Integer, IdeasCMD>();  
11  
12    static {  
13        for (IdeasCMD s : EnumSet.allOf(IdeasCMD.class)) {  
14            lookup.put(s.getValue(), s);  
15        }  
16    }  
17  
18    IdeasCMD(int value) {  
19        this.value = value;  
20    }  
21  
22    public int getValue() {  
23        return value;  
24    }  
25  
26    public static IdeasCMD lookup(int value) {  
27        return lookup.get(value);  
28    }  
29}