1 /*
   2  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.util.ArrayList;
  25 import java.util.HashMap;
  26 import java.util.List;
  27 import java.util.Map;
  28 
  29 /**
  30  * Month enum handles month related manipulation.
  31  *
  32  * @since 1.4
  33  */
  34 enum Month {
  35     JANUARY("Jan"),
  36     FEBRUARY("Feb"),
  37     MARCH("Mar"),
  38     APRIL("Apr"),
  39     MAY("May"),
  40     JUNE("Jun"),
  41     JULY("Jul"),
  42     AUGUST("Aug"),
  43     SEPTEMBER("Sep"),
  44     OCTOBER("Oct"),
  45     NOVEMBER("Nov"),
  46     DECEMBER("Dec");
  47 
  48     private final String abbr;
  49 
  50     private static final Map<String,Month> abbreviations
  51                                 = new HashMap<String,Month>(12);
  52 
  53     static {
  54         for (Month m : Month.values()) {
  55             abbreviations.put(m.abbr, m);
  56         }
  57     }
  58 
  59     private Month(String abbr) {
  60         this.abbr = abbr;
  61     }
  62 
  63     int value() {
  64         return ordinal() + 1;
  65     }
  66 
  67     /**
  68      * Parses the specified string as a month abbreviation.
  69      * @param name the month abbreviation
  70      * @return the Month value
  71      */
  72     static Month parse(String name) {
  73         Month m = abbreviations.get(name);
  74         if (m != null) {
  75             return m;
  76         }
  77         return null;
  78     }
  79 
  80     /**
  81      * @param month the nunmth number (1-based)
  82      * @return the month name in uppercase of the specified month
  83      */
  84     static String toString(int month) {
  85         if (month >= JANUARY.value() && month <= DECEMBER.value()) {
  86             return "Calendar." + Month.values()[month - 1];
  87         }
  88         throw new IllegalArgumentException("wrong month number: " + month);
  89     }
  90 }