811a5a4a |
1 | /* |
2 | * Copyright (C) 2011 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.support.v2.util; |
18 | |
19 | import java.io.PrintWriter; |
20 | |
21 | /** |
22 | * Useful time utilities that are not available on all versions of Android. |
23 | */ |
24 | public class TimeUtils { |
25 | /** @hide Field length that can hold 999 days of time */ |
26 | public static final int HUNDRED_DAY_FIELD_LEN = 19; |
27 | |
28 | private static final int SECONDS_PER_MINUTE = 60; |
29 | private static final int SECONDS_PER_HOUR = 60 * 60; |
30 | private static final int SECONDS_PER_DAY = 24 * 60 * 60; |
31 | |
32 | private static final Object sFormatSync = new Object(); |
33 | private static char[] sFormatStr = new char[HUNDRED_DAY_FIELD_LEN+5]; |
34 | |
35 | static private int accumField(int amt, int suffix, boolean always, int zeropad) { |
36 | if (amt > 99 || (always && zeropad >= 3)) { |
37 | return 3+suffix; |
38 | } |
39 | if (amt > 9 || (always && zeropad >= 2)) { |
40 | return 2+suffix; |
41 | } |
42 | if (always || amt > 0) { |
43 | return 1+suffix; |
44 | } |
45 | return 0; |
46 | } |
47 | |
48 | static private int printField(char[] formatStr, int amt, char suffix, int pos, |
49 | boolean always, int zeropad) { |
50 | if (always || amt > 0) { |
51 | final int startPos = pos; |
52 | if ((always && zeropad >= 3) || amt > 99) { |
53 | int dig = amt/100; |
54 | formatStr[pos] = (char)(dig + '0'); |
55 | pos++; |
56 | amt -= (dig*100); |
57 | } |
58 | if ((always && zeropad >= 2) || amt > 9 || startPos != pos) { |
59 | int dig = amt/10; |
60 | formatStr[pos] = (char)(dig + '0'); |
61 | pos++; |
62 | amt -= (dig*10); |
63 | } |
64 | formatStr[pos] = (char)(amt + '0'); |
65 | pos++; |
66 | formatStr[pos] = suffix; |
67 | pos++; |
68 | } |
69 | return pos; |
70 | } |
71 | |
72 | private static int formatDurationLocked(long duration, int fieldLen) { |
73 | if (sFormatStr.length < fieldLen) { |
74 | sFormatStr = new char[fieldLen]; |
75 | } |
76 | |
77 | char[] formatStr = sFormatStr; |
78 | |
79 | if (duration == 0) { |
80 | int pos = 0; |
81 | fieldLen -= 1; |
82 | while (pos < fieldLen) { |
83 | formatStr[pos] = ' '; |
84 | } |
85 | formatStr[pos] = '0'; |
86 | return pos+1; |
87 | } |
88 | |
89 | char prefix; |
90 | if (duration > 0) { |
91 | prefix = '+'; |
92 | } else { |
93 | prefix = '-'; |
94 | duration = -duration; |
95 | } |
96 | |
97 | int millis = (int)(duration%1000); |
98 | int seconds = (int) Math.floor(duration / 1000); |
99 | int days = 0, hours = 0, minutes = 0; |
100 | |
101 | if (seconds > SECONDS_PER_DAY) { |
102 | days = seconds / SECONDS_PER_DAY; |
103 | seconds -= days * SECONDS_PER_DAY; |
104 | } |
105 | if (seconds > SECONDS_PER_HOUR) { |
106 | hours = seconds / SECONDS_PER_HOUR; |
107 | seconds -= hours * SECONDS_PER_HOUR; |
108 | } |
109 | if (seconds > SECONDS_PER_MINUTE) { |
110 | minutes = seconds / SECONDS_PER_MINUTE; |
111 | seconds -= minutes * SECONDS_PER_MINUTE; |
112 | } |
113 | |
114 | int pos = 0; |
115 | |
116 | if (fieldLen != 0) { |
117 | int myLen = accumField(days, 1, false, 0); |
118 | myLen += accumField(hours, 1, myLen > 0, 2); |
119 | myLen += accumField(minutes, 1, myLen > 0, 2); |
120 | myLen += accumField(seconds, 1, myLen > 0, 2); |
121 | myLen += accumField(millis, 2, true, myLen > 0 ? 3 : 0) + 1; |
122 | while (myLen < fieldLen) { |
123 | formatStr[pos] = ' '; |
124 | pos++; |
125 | myLen++; |
126 | } |
127 | } |
128 | |
129 | formatStr[pos] = prefix; |
130 | pos++; |
131 | |
132 | int start = pos; |
133 | boolean zeropad = fieldLen != 0; |
134 | pos = printField(formatStr, days, 'd', pos, false, 0); |
135 | pos = printField(formatStr, hours, 'h', pos, pos != start, zeropad ? 2 : 0); |
136 | pos = printField(formatStr, minutes, 'm', pos, pos != start, zeropad ? 2 : 0); |
137 | pos = printField(formatStr, seconds, 's', pos, pos != start, zeropad ? 2 : 0); |
138 | pos = printField(formatStr, millis, 'm', pos, true, (zeropad && pos != start) ? 3 : 0); |
139 | formatStr[pos] = 's'; |
140 | return pos + 1; |
141 | } |
142 | |
143 | /** @hide Just for debugging; not internationalized. */ |
144 | public static void formatDuration(long duration, StringBuilder builder) { |
145 | synchronized (sFormatSync) { |
146 | int len = formatDurationLocked(duration, 0); |
147 | builder.append(sFormatStr, 0, len); |
148 | } |
149 | } |
150 | |
151 | /** @hide Just for debugging; not internationalized. */ |
152 | public static void formatDuration(long duration, PrintWriter pw, int fieldLen) { |
153 | synchronized (sFormatSync) { |
154 | int len = formatDurationLocked(duration, fieldLen); |
155 | pw.print(new String(sFormatStr, 0, len)); |
156 | } |
157 | } |
158 | |
159 | /** @hide Just for debugging; not internationalized. */ |
160 | public static void formatDuration(long duration, PrintWriter pw) { |
161 | formatDuration(duration, pw, 0); |
162 | } |
163 | |
164 | /** @hide Just for debugging; not internationalized. */ |
165 | public static void formatDuration(long time, long now, PrintWriter pw) { |
166 | if (time == 0) { |
167 | pw.print("--"); |
168 | return; |
169 | } |
170 | formatDuration(time-now, pw, 0); |
171 | } |
172 | } |