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