Yorke Lee | 2644d94 | 2013-10-28 11:05:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 com.android.contacts.common.util; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.text.format.DateFormat; |
Yorke Lee | 2644d94 | 2013-10-28 11:05:43 -0700 | [diff] [blame] | 21 | |
| 22 | import java.text.ParsePosition; |
| 23 | import java.text.SimpleDateFormat; |
| 24 | import java.util.Calendar; |
| 25 | import java.util.Date; |
| 26 | import java.util.GregorianCalendar; |
| 27 | import java.util.Locale; |
| 28 | import java.util.TimeZone; |
| 29 | |
| 30 | /** |
| 31 | * Utility methods for processing dates. |
| 32 | */ |
| 33 | public class DateUtils { |
| 34 | public static final TimeZone UTC_TIMEZONE = TimeZone.getTimeZone("UTC"); |
| 35 | |
| 36 | /** |
| 37 | * When parsing a date without a year, the system assumes 1970, which wasn't a leap-year. |
| 38 | * Let's add a one-off hack for that day of the year |
| 39 | */ |
| 40 | public static final String NO_YEAR_DATE_FEB29TH = "--02-29"; |
| 41 | |
| 42 | // Variations of ISO 8601 date format. Do not change the order - it does affect the |
| 43 | // result in ambiguous cases. |
| 44 | private static final SimpleDateFormat[] DATE_FORMATS = { |
| 45 | CommonDateUtils.FULL_DATE_FORMAT, |
| 46 | CommonDateUtils.DATE_AND_TIME_FORMAT, |
| 47 | new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'", Locale.US), |
| 48 | new SimpleDateFormat("yyyyMMdd", Locale.US), |
| 49 | new SimpleDateFormat("yyyyMMdd'T'HHmmssSSS'Z'", Locale.US), |
| 50 | new SimpleDateFormat("yyyyMMdd'T'HHmmss'Z'", Locale.US), |
| 51 | new SimpleDateFormat("yyyyMMdd'T'HHmm'Z'", Locale.US), |
| 52 | }; |
| 53 | |
| 54 | static { |
| 55 | for (SimpleDateFormat format : DATE_FORMATS) { |
| 56 | format.setLenient(true); |
| 57 | format.setTimeZone(UTC_TIMEZONE); |
| 58 | } |
| 59 | CommonDateUtils.NO_YEAR_DATE_FORMAT.setTimeZone(UTC_TIMEZONE); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Parses the supplied string to see if it looks like a date. |
| 64 | * |
| 65 | * @param string The string representation of the provided date |
| 66 | * @param mustContainYear If true, the string is parsed as a date containing a year. If false, |
| 67 | * the string is parsed into a valid date even if the year field is missing. |
| 68 | * @return A Calendar object corresponding to the date if the string is successfully parsed. |
| 69 | * If not, null is returned. |
| 70 | */ |
| 71 | public static Calendar parseDate(String string, boolean mustContainYear) { |
| 72 | ParsePosition parsePosition = new ParsePosition(0); |
| 73 | Date date; |
| 74 | if (!mustContainYear) { |
| 75 | final boolean noYearParsed; |
| 76 | // Unfortunately, we can't parse Feb 29th correctly, so let's handle this day seperately |
| 77 | if (NO_YEAR_DATE_FEB29TH.equals(string)) { |
| 78 | return getUtcDate(0, Calendar.FEBRUARY, 29); |
| 79 | } else { |
| 80 | synchronized (CommonDateUtils.NO_YEAR_DATE_FORMAT) { |
| 81 | date = CommonDateUtils.NO_YEAR_DATE_FORMAT.parse(string, parsePosition); |
| 82 | } |
| 83 | noYearParsed = parsePosition.getIndex() == string.length(); |
| 84 | } |
| 85 | |
| 86 | if (noYearParsed) { |
| 87 | return getUtcDate(date, true); |
| 88 | } |
| 89 | } |
| 90 | for (int i = 0; i < DATE_FORMATS.length; i++) { |
| 91 | SimpleDateFormat f = DATE_FORMATS[i]; |
| 92 | synchronized (f) { |
| 93 | parsePosition.setIndex(0); |
| 94 | date = f.parse(string, parsePosition); |
| 95 | if (parsePosition.getIndex() == string.length()) { |
| 96 | return getUtcDate(date, false); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | return null; |
| 101 | } |
| 102 | |
| 103 | private static final Calendar getUtcDate(Date date, boolean noYear) { |
| 104 | final Calendar calendar = Calendar.getInstance(UTC_TIMEZONE, Locale.US); |
| 105 | calendar.setTime(date); |
| 106 | if (noYear) { |
| 107 | calendar.set(Calendar.YEAR, 0); |
| 108 | } |
| 109 | return calendar; |
| 110 | } |
| 111 | |
| 112 | private static final Calendar getUtcDate(int year, int month, int dayOfMonth) { |
| 113 | final Calendar calendar = Calendar.getInstance(UTC_TIMEZONE, Locale.US); |
| 114 | calendar.clear(); |
| 115 | calendar.set(Calendar.YEAR, year); |
| 116 | calendar.set(Calendar.MONTH, month); |
| 117 | calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth); |
| 118 | return calendar; |
| 119 | } |
| 120 | |
| 121 | public static boolean isYearSet(Calendar cal) { |
| 122 | // use the Calendar.YEAR field to track whether or not the year is set instead of |
| 123 | // Calendar.isSet() because doing Calendar.get() causes Calendar.isSet() to become |
| 124 | // true irregardless of what the previous value was |
| 125 | return cal.get(Calendar.YEAR) > 1; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Same as {@link #formatDate(Context context, String string, boolean longForm)}, with |
| 130 | * longForm set to {@code true} by default. |
| 131 | * |
| 132 | * @param context Valid context |
| 133 | * @param string String representation of a date to parse |
| 134 | * @return Returns the same date in a cleaned up format. If the supplied string does not look |
| 135 | * like a date, return it unchanged. |
| 136 | */ |
| 137 | |
| 138 | public static String formatDate(Context context, String string) { |
| 139 | return formatDate(context, string, true); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Parses the supplied string to see if it looks like a date. |
| 144 | * |
| 145 | * @param context Valid context |
| 146 | * @param string String representation of a date to parse |
| 147 | * @param longForm If true, return the date formatted into its long string representation. |
| 148 | * If false, return the date formatted using its short form representation (i.e. 12/11/2012) |
| 149 | * @return Returns the same date in a cleaned up format. If the supplied string does not look |
| 150 | * like a date, return it unchanged. |
| 151 | */ |
| 152 | public static String formatDate(Context context, String string, boolean longForm) { |
| 153 | if (string == null) { |
| 154 | return null; |
| 155 | } |
| 156 | |
| 157 | string = string.trim(); |
| 158 | if (string.length() == 0) { |
| 159 | return string; |
| 160 | } |
| 161 | final Calendar cal = parseDate(string, false); |
| 162 | |
| 163 | // we weren't able to parse the string successfully so just return it unchanged |
| 164 | if (cal == null) { |
| 165 | return string; |
| 166 | } |
| 167 | |
| 168 | final boolean isYearSet = isYearSet(cal); |
| 169 | final java.text.DateFormat outFormat; |
| 170 | if (!isYearSet) { |
| 171 | outFormat = getLocalizedDateFormatWithoutYear(context); |
| 172 | } else { |
| 173 | outFormat = |
| 174 | longForm ? DateFormat.getLongDateFormat(context) : |
| 175 | DateFormat.getDateFormat(context); |
| 176 | } |
| 177 | synchronized (outFormat) { |
| 178 | outFormat.setTimeZone(UTC_TIMEZONE); |
| 179 | return outFormat.format(cal.getTime()); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | public static boolean isMonthBeforeDay(Context context) { |
| 184 | char[] dateFormatOrder = DateFormat.getDateFormatOrder(context); |
| 185 | for (int i = 0; i < dateFormatOrder.length; i++) { |
Brian Attwell | 971b758 | 2014-12-17 19:40:43 -0800 | [diff] [blame] | 186 | if (dateFormatOrder[i] == 'd') { |
Yorke Lee | 2644d94 | 2013-10-28 11:05:43 -0700 | [diff] [blame] | 187 | return false; |
| 188 | } |
Brian Attwell | 971b758 | 2014-12-17 19:40:43 -0800 | [diff] [blame] | 189 | if (dateFormatOrder[i] == 'M') { |
Yorke Lee | 2644d94 | 2013-10-28 11:05:43 -0700 | [diff] [blame] | 190 | return true; |
| 191 | } |
| 192 | } |
| 193 | return false; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Returns a SimpleDateFormat object without the year fields by using a regular expression |
| 198 | * to eliminate the year in the string pattern. In the rare occurence that the resulting |
| 199 | * pattern cannot be reconverted into a SimpleDateFormat, it uses the provided context to |
| 200 | * determine whether the month field should be displayed before the day field, and returns |
| 201 | * either "MMMM dd" or "dd MMMM" converted into a SimpleDateFormat. |
| 202 | */ |
| 203 | public static java.text.DateFormat getLocalizedDateFormatWithoutYear(Context context) { |
| 204 | final String pattern = ((SimpleDateFormat) SimpleDateFormat.getDateInstance( |
| 205 | java.text.DateFormat.LONG)).toPattern(); |
| 206 | // Determine the correct regex pattern for year. |
| 207 | // Special case handling for Spanish locale by checking for "de" |
| 208 | final String yearPattern = pattern.contains( |
| 209 | "de") ? "[^Mm]*[Yy]+[^Mm]*" : "[^DdMm]*[Yy]+[^DdMm]*"; |
| 210 | try { |
| 211 | // Eliminate the substring in pattern that matches the format for that of year |
| 212 | return new SimpleDateFormat(pattern.replaceAll(yearPattern, "")); |
| 213 | } catch (IllegalArgumentException e) { |
| 214 | return new SimpleDateFormat( |
| 215 | DateUtils.isMonthBeforeDay(context) ? "MMMM dd" : "dd MMMM"); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Given a calendar (possibly containing only a day of the year), returns the earliest possible |
| 221 | * anniversary of the date that is equal to or after the current point in time if the date |
| 222 | * does not contain a year, or the date converted to the local time zone (if the date contains |
| 223 | * a year. |
| 224 | * |
| 225 | * @param target The date we wish to convert(in the UTC time zone). |
| 226 | * @return If date does not contain a year (year < 1900), returns the next earliest anniversary |
| 227 | * that is after the current point in time (in the local time zone). Otherwise, returns the |
| 228 | * adjusted Date in the local time zone. |
| 229 | */ |
| 230 | public static Date getNextAnnualDate(Calendar target) { |
| 231 | final Calendar today = Calendar.getInstance(); |
| 232 | today.setTime(new Date()); |
| 233 | |
| 234 | // Round the current time to the exact start of today so that when we compare |
| 235 | // today against the target date, both dates are set to exactly 0000H. |
| 236 | today.set(Calendar.HOUR_OF_DAY, 0); |
| 237 | today.set(Calendar.MINUTE, 0); |
| 238 | today.set(Calendar.SECOND, 0); |
| 239 | today.set(Calendar.MILLISECOND, 0); |
| 240 | |
| 241 | final boolean isYearSet = isYearSet(target); |
| 242 | final int targetYear = target.get(Calendar.YEAR); |
| 243 | final int targetMonth = target.get(Calendar.MONTH); |
| 244 | final int targetDay = target.get(Calendar.DAY_OF_MONTH); |
| 245 | final boolean isFeb29 = (targetMonth == Calendar.FEBRUARY && targetDay == 29); |
| 246 | final GregorianCalendar anniversary = new GregorianCalendar(); |
| 247 | // Convert from the UTC date to the local date. Set the year to today's year if the |
| 248 | // there is no provided year (targetYear < 1900) |
| 249 | anniversary.set(!isYearSet ? today.get(Calendar.YEAR) : targetYear, |
| 250 | targetMonth, targetDay); |
| 251 | // If the anniversary's date is before the start of today and there is no year set, |
| 252 | // increment the year by 1 so that the returned date is always equal to or greater than |
| 253 | // today. If the day is a leap year, keep going until we get the next leap year anniversary |
| 254 | // Otherwise if there is already a year set, simply return the exact date. |
| 255 | if (!isYearSet) { |
| 256 | int anniversaryYear = today.get(Calendar.YEAR); |
| 257 | if (anniversary.before(today) || |
| 258 | (isFeb29 && !anniversary.isLeapYear(anniversaryYear))) { |
| 259 | // If the target date is not Feb 29, then set the anniversary to the next year. |
| 260 | // Otherwise, keep going until we find the next leap year (this is not guaranteed |
| 261 | // to be in 4 years time). |
| 262 | do { |
| 263 | anniversaryYear +=1; |
| 264 | } while (isFeb29 && !anniversary.isLeapYear(anniversaryYear)); |
| 265 | anniversary.set(anniversaryYear, targetMonth, targetDay); |
| 266 | } |
| 267 | } |
| 268 | return anniversary.getTime(); |
| 269 | } |
Yorke Lee | 2644d94 | 2013-10-28 11:05:43 -0700 | [diff] [blame] | 270 | } |