1 /*
2 * Copyright (c) 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.locale.provider;
27
28 import java.text.spi.BreakIteratorProvider;
29 import java.text.spi.CollatorProvider;
30 import java.text.spi.DateFormatProvider;
31 import java.text.spi.DateFormatSymbolsProvider;
32 import java.text.spi.DecimalFormatSymbolsProvider;
33 import java.text.spi.NumberFormatProvider;
34 import java.util.Arrays;
35 import java.util.HashSet;
36 import java.util.Locale;
37 import java.util.Set;
38 import java.util.concurrent.ConcurrentHashMap;
39 import java.util.concurrent.ConcurrentMap;
40 import java.util.spi.CalendarDataProvider;
41 import java.util.spi.CalendarNameProvider;
42 import java.util.spi.CurrencyNameProvider;
43 import java.util.spi.LocaleNameProvider;
44 import java.util.spi.LocaleServiceProvider;
45 import java.util.spi.TimeZoneNameProvider;
46 import sun.util.resources.LocaleData;
47
48 /**
49 * An abstract parent class for the
50 * HostLocaleProviderAdapter/SPILocaleProviderAdapter.
51 *
52 * @author Naoto Sato
53 * @author Masayoshi Okutsu
54 */
55 public abstract class AuxLocaleProviderAdapter extends LocaleProviderAdapter {
56 /**
57 * SPI implementations map
58 */
59 private ConcurrentMap<Class<? extends LocaleServiceProvider>, LocaleServiceProvider> providersMap =
60 new ConcurrentHashMap<>();
61
62 /**
63 * Getter method for Locale Service Providers
64 */
65 @Override
66 public <P extends LocaleServiceProvider> P getLocaleServiceProvider(Class<P> c) {
67 @SuppressWarnings("unchecked")
68 P lsp = (P) providersMap.get(c);
69 if (lsp == null) {
70 lsp = findInstalledProvider(c);
71 providersMap.putIfAbsent(c, lsp == null ? NULL_PROVIDER : lsp);
72 }
73
74 return lsp;
75 }
76
77 /**
78 * Real body to find an implementation for each SPI.
79 *
80 * @param <P>
81 * @param c
82 * @return
83 */
84 protected abstract <P extends LocaleServiceProvider> P findInstalledProvider(final Class<P> c);
85
86 @Override
87 public BreakIteratorProvider getBreakIteratorProvider() {
88 return getLocaleServiceProvider(BreakIteratorProvider.class);
89 }
90
91 @Override
92 public CollatorProvider getCollatorProvider() {
93 return getLocaleServiceProvider(CollatorProvider.class);
94 }
95
96 @Override
97 public DateFormatProvider getDateFormatProvider() {
98 return getLocaleServiceProvider(DateFormatProvider.class);
99 }
100
101 @Override
102 public DateFormatSymbolsProvider getDateFormatSymbolsProvider() {
103 return getLocaleServiceProvider(DateFormatSymbolsProvider.class);
104 }
105
106 @Override
107 public DecimalFormatSymbolsProvider getDecimalFormatSymbolsProvider() {
108 return getLocaleServiceProvider(DecimalFormatSymbolsProvider.class);
109 }
110
111 @Override
112 public NumberFormatProvider getNumberFormatProvider() {
113 return getLocaleServiceProvider(NumberFormatProvider.class);
114 }
115
116 /**
117 * Getter methods for java.util.spi.* providers
118 */
119 @Override
120 public CurrencyNameProvider getCurrencyNameProvider() {
121 return getLocaleServiceProvider(CurrencyNameProvider.class);
122 }
123
124 @Override
125 public LocaleNameProvider getLocaleNameProvider() {
126 return getLocaleServiceProvider(LocaleNameProvider.class);
127 }
128
129 @Override
130 public TimeZoneNameProvider getTimeZoneNameProvider() {
131 return getLocaleServiceProvider(TimeZoneNameProvider.class);
132 }
133
134 @Override
135 public CalendarDataProvider getCalendarDataProvider() {
136 return getLocaleServiceProvider(CalendarDataProvider.class);
137 }
138
139 @Override
140 public CalendarNameProvider getCalendarNameProvider() {
141 return getLocaleServiceProvider(CalendarNameProvider.class);
142 }
143
144 @Override
145 public LocaleResources getLocaleResources(Locale locale) {
146 return null;
147 }
148
149 @Override
150 public LocaleData getLocaleData() {
151 return null;
152 }
153
154 private static Locale[] availableLocales = null;
155
156 @Override
157 public Locale[] getAvailableLocales() {
158 if (availableLocales == null) {
159 Set<Locale> avail = new HashSet<>();
160 for (Class<? extends LocaleServiceProvider> c :
161 LocaleServiceProviderPool.spiClasses) {
162 LocaleServiceProvider lsp = getLocaleServiceProvider(c);
163 if (lsp != null) {
164 avail.addAll(Arrays.asList(lsp.getAvailableLocales()));
165 }
166 }
167 availableLocales = avail.toArray(new Locale[0]);
168 }
169
170 // assuming caller won't mutate the array.
171 return availableLocales;
172 }
173
174 /**
175 * A dummy locale service provider that indicates there is no
176 * provider available
177 */
178 private static NullProvider NULL_PROVIDER = new NullProvider();
179 private static class NullProvider extends LocaleServiceProvider {
180 @Override
181 public Locale[] getAvailableLocales() {
182 return new Locale[0];
183 }
184 }
185 }