1 /*
   2  * Copyright (c) 2000, 2004, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  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()) {
  57             abbreviations.put(m.abbr, m);
  58         }
  59     }
  60 
  61     private Month(String abbr) {
  62         this.abbr = abbr;
  63     }
  64 
  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      */
  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      */
  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 }