DateTimeFormat.java revision a40d2447b6f516116135ee7f126579771ba98a2c 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package libcore.icu;
18
19import com.ibm.icu.text.DateFormat;
20import com.ibm.icu.text.DateTimePatternGenerator;
21import com.ibm.icu.text.DisplayContext;
22import com.ibm.icu.text.SimpleDateFormat;
23import com.ibm.icu.util.Calendar;
24import com.ibm.icu.util.ULocale;
25
26import libcore.util.BasicLruCache;
27
28/**
29 * A formatter that outputs a single date/time.
30 */
31public class DateTimeFormat {
32  private static final FormatterCache CACHED_FORMATTERS = new FormatterCache();
33
34  static class FormatterCache extends BasicLruCache<String, DateFormat> {
35    FormatterCache() {
36      super(8);
37    }
38  }
39
40  private DateTimeFormat() {
41  }
42
43  public static String format(ULocale icuLocale, Calendar time, int flags,
44      DisplayContext displayContext) {
45    String skeleton = DateUtilsBridge.toSkeleton(time, flags);
46    String key = skeleton + "\t" + icuLocale + "\t" + time.getTimeZone();
47    synchronized(CACHED_FORMATTERS) {
48      DateFormat formatter = CACHED_FORMATTERS.get(key);
49      if (formatter == null) {
50        DateTimePatternGenerator generator = DateTimePatternGenerator.getInstance(icuLocale);
51        formatter = new SimpleDateFormat(generator.getBestPattern(skeleton), icuLocale);
52        CACHED_FORMATTERS.put(key, formatter);
53      }
54      formatter.setContext(displayContext);
55      return formatter.format(time);
56    }
57  }
58}
59