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      1 /*
      2  * Copyright (C) 2012 Google Inc.
      3  * Licensed to The Android Open Source Project.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 package com.android.mail;
     18 
     19 import android.content.Context;
     20 import android.content.res.Resources;
     21 import android.text.format.DateUtils;
     22 import android.text.format.Time;
     23 
     24 import java.util.Formatter;
     25 
     26 /**
     27  * Convenience class to efficiently make multiple short date strings. Instantiating and reusing
     28  * one of these builders is faster than repeatedly bringing up all the locale stuff.
     29  *
     30  */
     31 public class FormattedDateBuilder {
     32 
     33     private StringBuilder sb;
     34     private Formatter dateFormatter;
     35     private Context mContext;
     36 
     37     public FormattedDateBuilder(Context context) {
     38         mContext = context;
     39         sb = new StringBuilder();
     40         dateFormatter = new Formatter(sb);
     41     }
     42 
     43     public CharSequence formatShortDate(long when) {
     44         return DateUtils.getRelativeTimeSpanString(mContext, when);
     45     }
     46 
     47     public CharSequence formatLongDateTime(long when) {
     48         final Resources resources = mContext.getResources();
     49 
     50         if (DateUtils.isToday(when)) {
     51             return resources.getString(R.string.date_message_received_today, formatLongTime(when));
     52         } else if (isYesterday(when)) {
     53             return resources.getString(
     54                     R.string.date_message_received_yesterday, formatLongTime(when));
     55         } else {
     56             return resources.getString(R.string.date_message_received,
     57                     formatLongDayAndDate(when), formatLongTime(when));
     58         }
     59     }
     60 
     61     private CharSequence formatLongDayAndDate(long when) {
     62         sb.setLength(0);
     63         DateUtils.formatDateRange(mContext, dateFormatter, when, when,
     64                 DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY
     65                         | DateUtils.FORMAT_SHOW_YEAR | DateUtils.FORMAT_ABBREV_ALL);
     66         return sb.toString();
     67     }
     68 
     69     private CharSequence formatLongTime(long when) {
     70         sb.setLength(0);
     71         DateUtils.formatDateRange(mContext, dateFormatter, when, when,
     72                 DateUtils.FORMAT_SHOW_TIME);
     73         return sb.toString();
     74     }
     75 
     76     /**
     77      * @return true if the supplied when is today else false
     78      */
     79     private static boolean isYesterday(long when) {
     80         final Time time = new Time();
     81         time.set(when);
     82 
     83         final int thenYear = time.year;
     84         final int thenMonth = time.month;
     85         final int thenMonthDay = time.monthDay;
     86 
     87         time.set(System.currentTimeMillis());
     88         return (thenYear == time.year)
     89                 && (thenMonth == time.month)
     90                 && (thenMonthDay == (time.monthDay-1));
     91     }
     92 }
     93