1 /*
   2  * Copyright (c) 1999, 2014, 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.locale.provider;
  27 
  28 import java.text.DateFormat;
  29 import java.text.SimpleDateFormat;
  30 import java.text.spi.DateFormatProvider;
  31 import java.util.Calendar;
  32 import java.util.Locale;
  33 import java.util.MissingResourceException;
  34 import java.util.Set;
  35 
  36 /**
  37  * Concrete implementation of the  {@link java.text.spi.DateFormatProvider
  38  * DateFormatProvider} class for the JRE LocaleProviderAdapter.
  39  *
  40  * @author Naoto Sato
  41  * @author Masayoshi Okutsu
  42  */
  43 public class DateFormatProviderImpl extends DateFormatProvider implements AvailableLanguageTags {
  44     private final LocaleProviderAdapter.Type type;
  45     private static Set<String> langtags;
  46 
  47     public DateFormatProviderImpl(LocaleProviderAdapter.Type type) {
  48         this.type = type;
  49     }
  50 
  51     /**
  52      * Returns an array of all locales for which this locale service provider
  53      * can provide localized objects or names.
  54      *
  55      * @return An array of all locales for which this locale service provider
  56      * can provide localized objects or names.
  57      */
  58     @Override
  59     public Locale[] getAvailableLocales() {
  60         return LocaleProviderAdapter.toLocaleArray(getLangTags(type));
  61     }
  62 
  63     @Override
  64     public boolean isSupportedLocale(Locale locale) {
  65         return LocaleProviderAdapter.isSupportedLocale(locale, type, getLangTags(type));
  66     }
  67 
  68     /**
  69      * Returns a new <code>DateFormat</code> instance which formats time
  70      * with the given formatting style for the specified locale.
  71      * @param style the given formatting style.  Either one of
  72      *     {@link java.text.DateFormat#SHORT DateFormat.SHORT},
  73      *     {@link java.text.DateFormat#MEDIUM DateFormat.MEDIUM},
  74      *     {@link java.text.DateFormat#LONG DateFormat.LONG}, or
  75      *     {@link java.text.DateFormat#FULL DateFormat.FULL}.
  76      * @param locale the desired locale.
  77      * @exception IllegalArgumentException if <code>style</code> is invalid,
  78      *     or if <code>locale</code> isn't
  79      *     one of the locales returned from
  80      *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
  81      *     getAvailableLocales()}.
  82      * @exception NullPointerException if <code>locale</code> is null
  83      * @return a time formatter.
  84      * @see java.text.DateFormat#getTimeInstance(int, java.util.Locale)
  85      */
  86     @Override
  87     public DateFormat getTimeInstance(int style, Locale locale) {
  88         return getInstance(-1, style, locale);
  89     }
  90 
  91     /**
  92      * Returns a new <code>DateFormat</code> instance which formats date
  93      * with the given formatting style for the specified locale.
  94      * @param style the given formatting style.  Either one of
  95      *     {@link java.text.DateFormat#SHORT DateFormat.SHORT},
  96      *     {@link java.text.DateFormat#MEDIUM DateFormat.MEDIUM},
  97      *     {@link java.text.DateFormat#LONG DateFormat.LONG}, or
  98      *     {@link java.text.DateFormat#FULL DateFormat.FULL}.
  99      * @param locale the desired locale.
 100      * @exception IllegalArgumentException if <code>style</code> is invalid,
 101      *     or if <code>locale</code> isn't
 102      *     one of the locales returned from
 103      *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
 104      *     getAvailableLocales()}.
 105      * @exception NullPointerException if <code>locale</code> is null
 106      * @return a date formatter.
 107      * @see java.text.DateFormat#getDateInstance(int, java.util.Locale)
 108      */
 109     @Override
 110     public DateFormat getDateInstance(int style, Locale locale) {
 111         return getInstance(style, -1, locale);
 112     }
 113 
 114     /**
 115      * Returns a new <code>DateFormat</code> instance which formats date and time
 116      * with the given formatting style for the specified locale.
 117      * @param dateStyle the given date formatting style.  Either one of
 118      *     {@link java.text.DateFormat#SHORT DateFormat.SHORT},
 119      *     {@link java.text.DateFormat#MEDIUM DateFormat.MEDIUM},
 120      *     {@link java.text.DateFormat#LONG DateFormat.LONG}, or
 121      *     {@link java.text.DateFormat#FULL DateFormat.FULL}.
 122      * @param timeStyle the given time formatting style.  Either one of
 123      *     {@link java.text.DateFormat#SHORT DateFormat.SHORT},
 124      *     {@link java.text.DateFormat#MEDIUM DateFormat.MEDIUM},
 125      *     {@link java.text.DateFormat#LONG DateFormat.LONG}, or
 126      *     {@link java.text.DateFormat#FULL DateFormat.FULL}.
 127      * @param locale the desired locale.
 128      * @exception IllegalArgumentException if <code>dateStyle</code> or
 129      *     <code>timeStyle</code> is invalid,
 130      *     or if <code>locale</code> isn't
 131      *     one of the locales returned from
 132      *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
 133      *     getAvailableLocales()}.
 134      * @exception NullPointerException if <code>locale</code> is null
 135      * @return a date/time formatter.
 136      * @see java.text.DateFormat#getDateTimeInstance(int, int, java.util.Locale)
 137      */
 138     @Override
 139     public DateFormat getDateTimeInstance(int dateStyle, int timeStyle,
 140                                           Locale locale) {
 141         return getInstance(dateStyle, timeStyle, locale);
 142     }
 143 
 144     private DateFormat getInstance(int dateStyle, int timeStyle, Locale locale) {
 145         if (locale == null) {
 146             throw new NullPointerException();
 147         }
 148 
 149         SimpleDateFormat sdf = new SimpleDateFormat("", locale);
 150         Calendar cal = sdf.getCalendar();
 151         try {
 152             String pattern = LocaleProviderAdapter.forType(type)
 153                 .getLocaleResources(locale).getDateTimePattern(timeStyle, dateStyle,
 154                                                                cal);
 155             sdf.applyPattern(pattern);
 156         } catch (MissingResourceException mre) {
 157             // Specify the fallback pattern
 158             sdf.applyPattern("M/d/yy h:mm a");
 159         }
 160 
 161         return sdf;
 162     }
 163 
 164     @Override
 165     public Set<String> getAvailableLanguageTags() {
 166         return getLangTags(type);
 167     }
 168 
 169     /**
 170      * Available language tags for FormatData resources. Shared with other "format"
 171      * provider implementations.
 172      * */
 173     static Set<String> getLangTags(LocaleProviderAdapter.Type t) {
 174         if (langtags == null) {
 175             langtags = ((JRELocaleProviderAdapter)LocaleProviderAdapter.forType(t)).getLanguageTagSet("FormatData");
 176         }
 177         return langtags;
 178     }
 179 }