1package im.conversations.android.xmpp;
 2
 3import java.text.ParseException;
 4import java.text.SimpleDateFormat;
 5import java.util.Date;
 6import java.util.Locale;
 7
 8public final class Timestamps {
 9
10    private Timestamps() {
11        throw new IllegalStateException("Do not instantiate me");
12    }
13
14    public static long parse(final String input) throws ParseException {
15        if (input == null) {
16            throw new IllegalArgumentException("timestamp should not be null");
17        }
18        final String timestamp = input.replace("Z", "+0000");
19        final SimpleDateFormat simpleDateFormat =
20                new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ", Locale.US);
21        final long milliseconds = getMilliseconds(timestamp);
22        final String formatted =
23                timestamp.substring(0, 19) + timestamp.substring(timestamp.length() - 5);
24        final Date date = simpleDateFormat.parse(formatted);
25        if (date == null) {
26            throw new IllegalArgumentException("Date was null");
27        }
28        return date.getTime() + milliseconds;
29    }
30
31    private static long getMilliseconds(final String timestamp) {
32        if (timestamp.length() >= 25 && timestamp.charAt(19) == '.') {
33            final String millis = timestamp.substring(19, timestamp.length() - 5);
34            try {
35                double fractions = Double.parseDouble("0" + millis);
36                return Math.round(1000 * fractions);
37            } catch (final NumberFormatException e) {
38                return 0;
39            }
40        } else {
41            return 0;
42        }
43    }
44}