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 
17 package libcore.icu;
18 
19 import android.icu.text.DateFormat;
20 import android.icu.text.DateTimePatternGenerator;
21 import android.icu.text.DisplayContext;
22 import android.icu.text.SimpleDateFormat;
23 import android.icu.util.Calendar;
24 import android.icu.util.ULocale;
25 
26 import libcore.util.BasicLruCache;
27 
28 /**
29  * A formatter that outputs a single date/time.
30  */
31 public class DateTimeFormat {
32   private static final FormatterCache CACHED_FORMATTERS = new FormatterCache();
33 
34   static class FormatterCache extends BasicLruCache<String, DateFormat> {
FormatterCache()35     FormatterCache() {
36       super(8);
37     }
38   }
39 
DateTimeFormat()40   private DateTimeFormat() {
41   }
42 
format(ULocale icuLocale, Calendar time, int flags, DisplayContext displayContext)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