1 /*
2 * Copyright (c) 2012, 2013, 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 /*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos
33 *
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions are met:
38 *
39 * * Redistributions of source code must retain the above copyright notice,
40 * this list of conditions and the following disclaimer.
41 *
42 * * Redistributions in binary form must reproduce the above copyright notice,
43 * this list of conditions and the following disclaimer in the documentation
44 * and/or other materials provided with the distribution.
45 *
46 * * Neither the name of JSR-310 nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
54 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
55 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
56 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
59 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
60 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 package java.time.format;
63
64 import java.text.SimpleDateFormat;
65 import java.time.chrono.Chronology;
66 import java.util.Locale;
67 import java.util.concurrent.ConcurrentHashMap;
68 import java.util.concurrent.ConcurrentMap;
69 import sun.util.locale.provider.LocaleProviderAdapter;
70 import sun.util.locale.provider.LocaleResources;
71
72 /**
73 * A provider to obtain date-time formatters for a style.
74 * <p>
75 *
76 * <h3>Specification for implementors</h3>
77 * This implementation is based on extraction of data from a {@link SimpleDateFormat}.
78 * This class is immutable and thread-safe.
79 * This Implementations caches the returned formatters.
80 *
81 * @since 1.8
82 */
83 final class DateTimeFormatStyleProvider {
84 // TODO: Better implementation based on CLDR
85
86 /** Cache of formatters. */
87 private static final ConcurrentMap<String, Object> FORMATTER_CACHE = new ConcurrentHashMap<>(16, 0.75f, 2);
88
89 private DateTimeFormatStyleProvider() {}
90
91 /**
92 * Gets an Instance of the provider of format styles.
93 *
94 * @return the provider, not null
95 */
96 static DateTimeFormatStyleProvider getInstance() {
97 return new DateTimeFormatStyleProvider();
98 }
99
100 /**
101 * Gets a localized date, time or date-time formatter.
102 * <p>
103 * The formatter will be the most appropriate to use for the date and time style in the locale.
104 * For example, some locales will use the month name while others will use the number.
105 *
106 * @param dateStyle the date formatter style to obtain, null to obtain a time formatter
107 * @param timeStyle the time formatter style to obtain, null to obtain a date formatter
108 * @param chrono the chronology to use, not null
109 * @param locale the locale to use, not null
110 * @return the date-time formatter, not null
111 * @throws IllegalArgumentException if both format styles are null or if the locale is not recognized
112 */
113 public DateTimeFormatter getFormatter(
114 FormatStyle dateStyle, FormatStyle timeStyle, Chronology chrono, Locale locale) {
115 if (dateStyle == null && timeStyle == null) {
116 throw new IllegalArgumentException("Date and Time style must not both be null");
117 }
118 String key = chrono.getId() + '|' + locale.toString() + '|' + dateStyle + timeStyle;
119 Object cached = FORMATTER_CACHE.get(key);
120 if (cached != null) {
121 return (DateTimeFormatter) cached;
122 }
123
124 LocaleResources lr = LocaleProviderAdapter.getResourceBundleBased()
125 .getLocaleResources(locale);
126 String pattern = lr.getCldrDateTimePattern(convertStyle(timeStyle), convertStyle(dateStyle),
127 chrono.getCalendarType());
128 DateTimeFormatter formatter = new DateTimeFormatterBuilder().appendPattern(pattern).toFormatter(locale);
129 FORMATTER_CACHE.putIfAbsent(key, formatter);
130 return formatter;
131 }
132
133 /**
134 * Converts the enum style to the java.util.Calendar style. Standalone styles
135 * are not supported.
136 *
137 * @param style the enum style
138 * @return the int style, or -1 if style is null, indicating unrequired
139 */
140 private int convertStyle(FormatStyle style) {
141 if (style == null) {
142 return -1;
143 }
144 return style.ordinal(); // indices happen to align
145 }
146
147 }