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      1 /*
      2 ** Copyright 2006, 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.calendarcommon2;
     18 
     19 import java.util.Calendar;
     20 
     21 /**
     22  * According to RFC2445, durations are like this:
     23  *       WEEKS
     24  *     | DAYS [ HOURS [ MINUTES [ SECONDS ] ] ]
     25  *     | HOURS [ MINUTES [ SECONDS ] ]
     26  * it doesn't specifically, say, but this sort of implies that you can't have
     27  * 70 seconds.
     28  */
     29 public class Duration
     30 {
     31     public int sign; // 1 or -1
     32     public int weeks;
     33     public int days;
     34     public int hours;
     35     public int minutes;
     36     public int seconds;
     37 
     38     public Duration()
     39     {
     40         sign = 1;
     41     }
     42 
     43     /**
     44      * Parse according to RFC2445 ss4.3.6.  (It's actually a little loose with
     45      * its parsing, for better or for worse)
     46      */
     47     public void parse(String str) throws DateException
     48     {
     49         sign = 1;
     50         weeks = 0;
     51         days = 0;
     52         hours = 0;
     53         minutes = 0;
     54         seconds = 0;
     55 
     56         int len = str.length();
     57         int index = 0;
     58         char c;
     59 
     60         if (len < 1) {
     61             return ;
     62         }
     63 
     64         c = str.charAt(0);
     65         if (c == '-') {
     66             sign = -1;
     67             index++;
     68         }
     69         else if (c == '+') {
     70             index++;
     71         }
     72 
     73         if (len < index) {
     74             return ;
     75         }
     76 
     77         c = str.charAt(index);
     78         if (c != 'P') {
     79             throw new DateException (
     80                     "Duration.parse(str='" + str + "') expected 'P' at index="
     81                     + index);
     82         }
     83         index++;
     84         c = str.charAt(index);
     85         if (c == 'T') {
     86             index++;
     87         }
     88 
     89         int n = 0;
     90         for (; index < len; index++) {
     91             c = str.charAt(index);
     92             if (c >= '0' && c <= '9') {
     93                 n *= 10;
     94                 n += ((int)(c-'0'));
     95             }
     96             else if (c == 'W') {
     97                 weeks = n;
     98                 n = 0;
     99             }
    100             else if (c == 'H') {
    101                 hours = n;
    102                 n = 0;
    103             }
    104             else if (c == 'M') {
    105                 minutes = n;
    106                 n = 0;
    107             }
    108             else if (c == 'S') {
    109                 seconds = n;
    110                 n = 0;
    111             }
    112             else if (c == 'D') {
    113                 days = n;
    114                 n = 0;
    115             }
    116             else if (c == 'T') {
    117             }
    118             else {
    119                 throw new DateException (
    120                         "Duration.parse(str='" + str + "') unexpected char '"
    121                         + c + "' at index=" + index);
    122             }
    123         }
    124     }
    125 
    126     /**
    127      * Add this to the calendar provided, in place, in the calendar.
    128      */
    129     public void addTo(Calendar cal)
    130     {
    131         cal.add(Calendar.DAY_OF_MONTH, sign*weeks*7);
    132         cal.add(Calendar.DAY_OF_MONTH, sign*days);
    133         cal.add(Calendar.HOUR, sign*hours);
    134         cal.add(Calendar.MINUTE, sign*minutes);
    135         cal.add(Calendar.SECOND, sign*seconds);
    136     }
    137 
    138     public long addTo(long dt) {
    139         return dt + getMillis();
    140     }
    141 
    142     public long getMillis() {
    143         long factor = 1000 * sign;
    144         return factor * ((7*24*60*60*weeks)
    145                 + (24*60*60*days)
    146                 + (60*60*hours)
    147                 + (60*minutes)
    148                 + seconds);
    149     }
    150 }
    151