| 1 | package org.amicofragile.time; |
| 2 | /** |
| 3 | * System time access abstraction class. |
| 4 | * @author Pietro Martinelli |
| 5 | * |
| 6 | */ |
| 7 | public final class SystemTime { |
| 8 | /** |
| 9 | * Default {@link TimeSource}: this {@link TimeSource} delegates to {@link System#currentTimeMillis()}. |
| 10 | */ |
| 11 | private static final TimeSource DEFAULT_TIME_SOURCE = new SystemTimeSource(); |
| 12 | /** |
| 13 | * Current {@link TimeSource} in use. |
| 14 | */ |
| 15 | private static TimeSource timeSource = DEFAULT_TIME_SOURCE; |
| 16 | /** |
| 17 | * Gets current time in milliseconds. |
| 18 | * @return current time in milliseconds |
| 19 | */ |
| 20 | public static long currentTimeInMillis() { |
| 21 | return timeSource.currentTimeInMillis(); |
| 22 | } |
| 23 | /** |
| 24 | * Sets {@linkplain TimeSource} provider to use. |
| 25 | * @param timeSource {@link TimeSource} provider to use |
| 26 | */ |
| 27 | public static void setTimeSource(final TimeSource timeSource) { |
| 28 | SystemTime.timeSource = timeSource; |
| 29 | } |
| 30 | /** |
| 31 | * Resets {@link TimeSource} provider to default. |
| 32 | */ |
| 33 | public static void reset() { |
| 34 | SystemTime.timeSource = DEFAULT_TIME_SOURCE; |
| 35 | } |
| 36 | /** |
| 37 | * This constructor throws InstantiationException at every invocation: this class is designed for static use only. |
| 38 | * @throws InstantiationException The class is designed for static use only |
| 39 | */ |
| 40 | protected SystemTime() throws InstantiationException { |
| 41 | throw new InstantiationException(); |
| 42 | } |
| 43 | } |