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 android.text.format; 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 import android.util.LruCache; 26 27 /** 28 * A formatter that outputs a single date/time. 29 * 30 * @hide 31 */ 32 @android.ravenwood.annotation.RavenwoodKeepWholeClass 33 class DateTimeFormat { 34 private static final FormatterCache CACHED_FORMATTERS = new FormatterCache(); 35 36 static class FormatterCache extends LruCache<String, DateFormat> { FormatterCache()37 FormatterCache() { 38 super(8); 39 } 40 } 41 DateTimeFormat()42 private DateTimeFormat() { 43 } 44 format(ULocale icuLocale, Calendar time, int flags, DisplayContext displayContext)45 public static String format(ULocale icuLocale, Calendar time, int flags, 46 DisplayContext displayContext) { 47 String skeleton = DateUtilsBridge.toSkeleton(time, flags); 48 String key = skeleton + "\t" + icuLocale + "\t" + time.getTimeZone(); 49 synchronized (CACHED_FORMATTERS) { 50 DateFormat formatter = CACHED_FORMATTERS.get(key); 51 if (formatter == null) { 52 DateTimePatternGenerator generator = DateTimePatternGenerator.getInstance( 53 icuLocale); 54 formatter = new SimpleDateFormat(generator.getBestPattern(skeleton), icuLocale); 55 CACHED_FORMATTERS.put(key, formatter); 56 } 57 formatter.setContext(displayContext); 58 return formatter.format(time); 59 } 60 } 61 } 62