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25 
26 import java.util.ArrayList;
27 import java.util.HashMap;
28 import java.util.List;
29 import java.util.Map;
30 
31 /**
32  * Month enum handles month related manipulation.
33  *
34  * @since 1.4
35  */
36 enum Month {
37     JANUARY("Jan"),
38     FEBRUARY("Feb"),
39     MARCH("Mar"),
40     APRIL("Apr"),
41     MAY("May"),
42     JUNE("Jun"),
43     JULY("Jul"),
44     AUGUST("Aug"),
45     SEPTEMBER("Sep"),
46     OCTOBER("Oct"),
47     NOVEMBER("Nov"),
48     DECEMBER("Dec");
49 
50     private final String abbr;
51 
52     private static final Map<String,Month> abbreviations
53                                 = new HashMap<String,Month>(12);
54 
55     static {
56         for (Month m : Month.values()) {
abbreviations.put(m.abbr, m)57             abbreviations.put(m.abbr, m);
58         }
59     }
60 
Month(String abbr)61     private Month(String abbr) {
62         this.abbr = abbr;
63     }
64 
value()65     int value() {
66         return ordinal() + 1;
67     }
68 
69     /**
70      * Parses the specified string as a month abbreviation.
71      * @param name the month abbreviation
72      * @return the Month value
73      */
parse(String name)74     static Month parse(String name) {
75         Month m = abbreviations.get(name);
76         if (m != null) {
77             return m;
78         }
79         return null;
80     }
81 
82     /**
83      * @param month the nunmth number (1-based)
84      * @return the month name in uppercase of the specified month
85      */
toString(int month)86     static String toString(int month) {
87         if (month >= JANUARY.value() && month <= DECEMBER.value()) {
88             return "Calendar." + Month.values()[month - 1];
89         }
90         throw new IllegalArgumentException("wrong month number: " + month);
91     }
92 }
93