1 /*

     2  * Copyright (c) 2000, 2012, 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 package sun.util;

    27 

    28 import java.io.IOException;

    29 import java.io.ObjectInputStream;

    30 import java.util.GregorianCalendar;

    31 import java.util.Locale;

    32 import java.util.Map;

    33 import java.util.TimeZone;

    34 import sun.util.locale.provider.CalendarDataUtility;

    35 

    36 public class BuddhistCalendar extends GregorianCalendar {

    37 

    38 //////////////////

    39 // Class Variables

    40 //////////////////

    41 

    42     private static final long serialVersionUID = -8527488697350388578L;

    43 

    44     private static final int BUDDHIST_YEAR_OFFSET = 543;

    45 

    46 ///////////////

    47 // Constructors

    48 ///////////////

    49 

    50     /**

    51      * Constructs a default BuddhistCalendar using the current time

    52      * in the default time zone with the default locale.

    53      */

    54     public BuddhistCalendar() {

    55         super();

    56     }

    57 

    58     /**

    59      * Constructs a BuddhistCalendar based on the current time

    60      * in the given time zone with the default locale.

    61      * @param zone the given time zone.

    62      */

    63     public BuddhistCalendar(TimeZone zone) {

    64         super(zone);

    65     }

    66 

    67     /**

    68      * Constructs a BuddhistCalendar based on the current time

    69      * in the default time zone with the given locale.

    70      * @param aLocale the given locale.

    71      */

    72     public BuddhistCalendar(Locale aLocale) {

    73         super(aLocale);

    74     }

    75 

    76     /**

    77      * Constructs a BuddhistCalendar based on the current time

    78      * in the given time zone with the given locale.

    79      * @param zone the given time zone.

    80      * @param aLocale the given locale.

    81      */

    82     public BuddhistCalendar(TimeZone zone, Locale aLocale) {

    83         super(zone, aLocale);

    84     }

    85 

    86 /////////////////

    87 // Public methods

    88 /////////////////

    89 

    90     /**

    91      * Returns {@code "buddhist"} as the calendar type of this Calendar.

    92      */

    93     @Override

    94     public String getCalendarType() {

    95         return "buddhist";

    96     }

    97 

    98     /**

    99      * Compares this BuddhistCalendar to an object reference.

   100      * @param obj the object reference with which to compare

   101      * @return true if this object is equal to <code>obj</code>; false otherwise

   102      */

   103     @Override

   104     public boolean equals(Object obj) {

   105         return obj instanceof BuddhistCalendar

   106             && super.equals(obj);

   107     }

   108 

   109     /**

   110      * Override hashCode.

   111      * Generates the hash code for the BuddhistCalendar object

   112      */

   113     @Override

   114     public int hashCode() {

   115         return super.hashCode() ^ BUDDHIST_YEAR_OFFSET;

   116     }

   117 

   118     /**

   119      * Gets the value for a given time field.

   120      * @param field the given time field.

   121      * @return the value for the given time field.

   122      */

   123     @Override

   124     public int get(int field)

   125     {

   126         if (field == YEAR) {

   127             return super.get(field) + yearOffset;

   128         }

   129         return super.get(field);

   130     }

   131 

   132     /**

   133      * Sets the time field with the given value.

   134      * @param field the given time field.

   135      * @param value the value to be set for the given time field.

   136      */

   137     @Override

   138     public void set(int field, int value)

   139     {

   140         if (field == YEAR) {

   141             super.set(field, value - yearOffset);

   142         } else {

   143             super.set(field, value);

   144         }

   145     }

   146 

   147     /**

   148      * Adds the specified (signed) amount of time to the given time field.

   149      * @param field the time field.

   150      * @param amount the amount of date or time to be added to the field.

   151      */

   152     @Override

   153     public void add(int field, int amount)

   154     {

   155         int savedYearOffset = yearOffset;

   156         // To let the superclass calculate date-time values correctly,

   157         // temporarily make this GregorianCalendar.

   158         yearOffset = 0;

   159         try {

   160             super.add(field, amount);

   161         } finally {

   162             yearOffset = savedYearOffset;

   163         }

   164     }

   165 

   166     /**

   167      * Add to field a signed amount without changing larger fields.

   168      * A negative roll amount means to subtract from field without changing

   169      * larger fields.

   170      * @param field the time field.

   171      * @param amount the signed amount to add to <code>field</code>.

   172      */

   173     @Override

   174     public void roll(int field, int amount)

   175     {

   176         int savedYearOffset = yearOffset;

   177         // To let the superclass calculate date-time values correctly,

   178         // temporarily make this GregorianCalendar.

   179         yearOffset = 0;

   180         try {

   181             super.roll(field, amount);

   182         } finally {

   183             yearOffset = savedYearOffset;

   184         }

   185     }

   186 

   187     @Override

   188     public String getDisplayName(int field, int style, Locale locale) {

   189         if (field != ERA) {

   190             return super.getDisplayName(field, style, locale);

   191         }

   192 

   193         return CalendarDataUtility.retrieveFieldValueName("buddhist", field, get(field), style, locale);

   194     }

   195 

   196     @Override

   197     public Map<String,Integer> getDisplayNames(int field, int style, Locale locale) {

   198         if (field != ERA) {

   199             return super.getDisplayNames(field, style, locale);

   200         }

   201         return CalendarDataUtility.retrieveFieldValueNames("buddhist", field, style, locale);

   202     }

   203 

   204     /**

   205      * Returns the maximum value that this field could have, given the

   206      * current date.  For example, with the date "Feb 3, 2540" and the

   207      * <code>DAY_OF_MONTH</code> field, the actual maximum is 28; for

   208      * "Feb 3, 2539" it is 29.

   209      *

   210      * @param field the field to determine the maximum of

   211      * @return the maximum of the given field for the current date of this Calendar

   212      */

   213     @Override

   214     public int getActualMaximum(int field) {

   215         int savedYearOffset = yearOffset;

   216         // To let the superclass calculate date-time values correctly,

   217         // temporarily make this GregorianCalendar.

   218         yearOffset = 0;

   219         try {

   220             return super.getActualMaximum(field);

   221         } finally {

   222             yearOffset = savedYearOffset;

   223         }

   224     }

   225 

   226     @Override

   227     @SuppressWarnings("empty-statement")

   228     public String toString() {

   229         // The super class produces a String with the Gregorian year

   230         // value (or '?')

   231         String s = super.toString();

   232         // If the YEAR field is UNSET, then return the Gregorian string.

   233         if (!isSet(YEAR)) {

   234             return s;

   235         }

   236 

   237         final String yearField = "YEAR=";

   238         int p = s.indexOf(yearField);

   239         // If the string doesn't include the year value for some

   240         // reason, then return the Gregorian string.

   241         if (p == -1) {

   242             return s;

   243         }

   244         p += yearField.length();

   245         StringBuilder sb = new StringBuilder(s.length() + 10);

   246         sb.append(s, 0, p);

   247         // Skip the year number

   248         while (Character.isDigit(s.charAt(p++)))

   249             ;

   250         int year = internalGet(YEAR) + BUDDHIST_YEAR_OFFSET;

   251         sb.append(year).append(s, p - 1, s.length());

   252         return sb.toString();

   253     }

   254 

   255     private transient int yearOffset = BUDDHIST_YEAR_OFFSET;

   256 

   257     private void readObject(ObjectInputStream stream)

   258         throws IOException, ClassNotFoundException {

   259         stream.defaultReadObject();

   260         yearOffset = BUDDHIST_YEAR_OFFSET;

   261     }

   262 }