1 /*
2 * Copyright (c) 2012, 2015, 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.security.AccessController;
29 import java.security.PrivilegedAction;
30 import java.text.spi.BreakIteratorProvider;
31 import java.text.spi.CollatorProvider;
32 import java.text.spi.DateFormatProvider;
33 import java.text.spi.DateFormatSymbolsProvider;
34 import java.text.spi.DecimalFormatSymbolsProvider;
35 import java.text.spi.NumberFormatProvider;
36 import java.util.ArrayList;
37 import java.util.Arrays;
38 import java.util.List;
39 import java.util.Locale;
40 import java.util.concurrent.ConcurrentHashMap;
41 import java.util.concurrent.ConcurrentMap;
42 import java.util.spi.CalendarDataProvider;
43 import java.util.spi.CalendarNameProvider;
44 import java.util.spi.CurrencyNameProvider;
45 import java.util.spi.LocaleNameProvider;
46 import java.util.spi.LocaleServiceProvider;
47 import java.util.spi.TimeZoneNameProvider;
48 import sun.util.spi.CalendarProvider;
49
50 /**
51 * An abstract parent class for the
52 * HostLocaleProviderAdapter/SPILocaleProviderAdapter.
53 *
54 * @author Naoto Sato
55 * @author Masayoshi Okutsu
56 */
57 public abstract class AuxLocaleProviderAdapter extends LocaleProviderAdapter {
58 /**
59 * SPI implementations map
60 */
61 private final ConcurrentMap<Class<? extends LocaleServiceProvider>, LocaleServiceProvider> providersMap =
62 new ConcurrentHashMap<>();
63
64 /**
65 * Getter method for Locale Service Providers
66 */
67 @Override
68 public <P extends LocaleServiceProvider> P getLocaleServiceProvider(Class<P> c) {
69 @SuppressWarnings("unchecked")
70 P lsp = (P) providersMap.get(c);
71 if (lsp == null) {
72 lsp = findInstalledProvider(c);
73 providersMap.putIfAbsent(c, lsp == null ? NULL_PROVIDER : lsp);
74 }
75
76 return lsp;
77 }
78
79 /**
80 * Real body to find an implementation for each SPI.
81 *
82 * @param <P>
83 * @param c
84 * @return
85 */
86 protected abstract <P extends LocaleServiceProvider> P findInstalledProvider(final Class<P> c);
87
88 @Override
89 public BreakIteratorProvider getBreakIteratorProvider() {
90 return getLocaleServiceProvider(BreakIteratorProvider.class);
91 }
92
93 @Override
94 public CollatorProvider getCollatorProvider() {
95 return getLocaleServiceProvider(CollatorProvider.class);
96 }
97
98 @Override
99 public DateFormatProvider getDateFormatProvider() {
100 return getLocaleServiceProvider(DateFormatProvider.class);
101 }
102
103 @Override
104 public DateFormatSymbolsProvider getDateFormatSymbolsProvider() {
105 return getLocaleServiceProvider(DateFormatSymbolsProvider.class);
106 }
107
108 @Override
109 public DecimalFormatSymbolsProvider getDecimalFormatSymbolsProvider() {
110 return getLocaleServiceProvider(DecimalFormatSymbolsProvider.class);
111 }
112
113 @Override
114 public NumberFormatProvider getNumberFormatProvider() {
115 return getLocaleServiceProvider(NumberFormatProvider.class);
116 }
117
118 /**
119 * Getter methods for java.util.spi.* providers
120 */
121 @Override
122 public CurrencyNameProvider getCurrencyNameProvider() {
123 return getLocaleServiceProvider(CurrencyNameProvider.class);
124 }
125
126 @Override
127 public LocaleNameProvider getLocaleNameProvider() {
128 return getLocaleServiceProvider(LocaleNameProvider.class);
129 }
130
131 @Override
132 public TimeZoneNameProvider getTimeZoneNameProvider() {
133 return getLocaleServiceProvider(TimeZoneNameProvider.class);
134 }
135
136 @Override
137 public CalendarDataProvider getCalendarDataProvider() {
138 return getLocaleServiceProvider(CalendarDataProvider.class);
139 }
140
141 @Override
142 public CalendarNameProvider getCalendarNameProvider() {
143 return getLocaleServiceProvider(CalendarNameProvider.class);
144 }
145
146 /**
147 * Getter methods for sun.util.spi.* providers
148 */
149 @Override
150 public CalendarProvider getCalendarProvider() {
151 return getLocaleServiceProvider(CalendarProvider.class);
152 }
153
154 @Override
155 public LocaleResources getLocaleResources(Locale locale) {
156 return null;
157 }
158
159 private static Locale[] availableLocales = null;
160
161 @Override
162 public Locale[] getAvailableLocales() {
163 if (availableLocales == null) {
164 List<Locale> avail = new ArrayList<>();
165 for (Class<? extends LocaleServiceProvider> c :
166 LocaleServiceProviderPool.spiClasses) {
167 LocaleServiceProvider lsp = getLocaleServiceProvider(c);
168 if (lsp != null) {
169 avail.addAll(Arrays.asList(lsp.getAvailableLocales()));
170 }
171 }
172 availableLocales = avail.toArray(new Locale[0]);
173 }
174
175 // assuming caller won't mutate the array.
176 return availableLocales;
177 }
178
179 /**
180 * A dummy locale service provider that indicates there is no
181 * provider available
182 */
183 private static final NullProvider NULL_PROVIDER = AccessController.doPrivileged(
184 (PrivilegedAction<NullProvider>) () -> new NullProvider());
185
186 private static class NullProvider extends LocaleServiceProvider {
187 @Override
188 public Locale[] getAvailableLocales() {
189 return new Locale[0];
190 }
191 }
192 }