util/concurrent/TimeUnit.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

package java.util.concurrent;

/**
 * A {@code TimeUnit} represents time durations at a given unit of
 * granularity and provides utility methods to convert across units,
 * and to perform timing and delay operations in these units.  A
 * {@code TimeUnit} does not maintain time information, but only
 * helps organize and use time representations that may be maintained
 * separately across various contexts.  A nanosecond is defined as one
 * thousandth of a microsecond, a microsecond as one thousandth of a
 * millisecond, a millisecond as one thousandth of a second, a minute
 * as sixty seconds, an hour as sixty minutes, and a day as twenty four
 * hours.
 *
 * <p>A {@code TimeUnit} is mainly used to inform time-based methods
 * how a given timing parameter should be interpreted. For example,
 * the following code will timeout in 50 milliseconds if the {@link
 * java.util.concurrent.locks.Lock lock} is not available:
 *
 *  <pre> {@code
 * Lock lock = ...;
 * if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre>
 *
 * while this code will timeout in 50 seconds:
 *  <pre> {@code
 * Lock lock = ...;
 * if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre>
 *
 * Note however, that there is no guarantee that a particular timeout
 * implementation will be able to notice the passage of time at the
 * same granularity as the given {@code TimeUnit}.
 *
 * @since 1.5
 * @author Doug Lea
 */
public enum TimeUnit {
    /**
     * Time unit representing one thousandth of a microsecond
     */
    NANOSECONDS {
        public long toNanos(long d)   { return d; }
        public long toMicros(long d)  { return d/(C1/C0); }
        public long toMillis(long d)  { return d/(C2/C0); }
        public long toSeconds(long d) { return d/(C3/C0); }
        public long toMinutes(long d) { return d/(C4/C0); }
        public long toHours(long d)   { return d/(C5/C0); }
        public long toDays(long d)    { return d/(C6/C0); }
        public long convert(long d, TimeUnit u) { return u.toNanos(d); }
        int excessNanos(long d, long m) { return (int)(d - (m*C2)); }
    },

    /**
     * Time unit representing one thousandth of a millisecond
     */
    MICROSECONDS {
        public long toNanos(long d)   { return x(d, C1/C0, MAX/(C1/C0)); }
        public long toMicros(long d)  { return d; }
        public long toMillis(long d)  { return d/(C2/C1); }
        public long toSeconds(long d) { return d/(C3/C1); }
        public long toMinutes(long d) { return d/(C4/C1); }
        public long toHours(long d)   { return d/(C5/C1); }
        public long toDays(long d)    { return d/(C6/C1); }
        public long convert(long d, TimeUnit u) { return u.toMicros(d); }
        int excessNanos(long d, long m) { return (int)((d*C1) - (m*C2)); }
    },

    /**
     * Time unit representing one thousandth of a second
     */
    MILLISECONDS {
        public long toNanos(long d)   { return x(d, C2/C0, MAX/(C2/C0)); }
        public long toMicros(long d)  { return x(d, C2/C1, MAX/(C2/C1)); }
        public long toMillis(long d)  { return d; }
        public long toSeconds(long d) { return d/(C3/C2); }
        public long toMinutes(long d) { return d/(C4/C2); }
        public long toHours(long d)   { return d/(C5/C2); }
        public long toDays(long d)    { return d/(C6/C2); }
        public long convert(long d, TimeUnit u) { return u.toMillis(d); }
        int excessNanos(long d, long m) { return 0; }
    },

    /**
     * Time unit representing one second
     */
    SECONDS {
        public long toNanos(long d)   { return x(d, C3/C0, MAX/(C3/C0)); }
        public long toMicros(long d)  { return x(d, C3/C1, MAX/(C3/C1)); }
        public long toMillis(long d)  { return x(d, C3/C2, MAX/(C3/C2)); }
        public long toSeconds(long d) { return d; }
        public long toMinutes(long d) { return d/(C4/C3); }
        public long toHours(long d)   { return d/(C5/C3); }
        public long toDays(long d)    { return d/(C6/C3); }
        public long convert(long d, TimeUnit u) { return u.toSeconds(d); }
        int excessNanos(long d, long m) { return 0; }
    },

    /**
     * Time unit representing sixty seconds
     * @since 1.6
     */
    MINUTES {
        public long toNanos(long d)   { return x(d, C4/C0, MAX/(C4/C0)); }
        public long toMicros(long d)  { return x(d, C4/C1, MAX/(C4/C1)); }
        public long toMillis(long d)  { return x(d, C4/C2, MAX/(C4/C2)); }
        public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
        public long toMinutes(long d) { return d; }
        public long toHours(long d)   { return d/(C5/C4); }
        public long toDays(long d)    { return d/(C6/C4); }
        public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
        int excessNanos(long d, long m) { return 0; }
    },

    /**
     * Time unit representing sixty minutes
     * @since 1.6
     */
    HOURS {
        public long toNanos(long d)   { return x(d, C5/C0, MAX/(C5/C0)); }
        public long toMicros(long d)  { return x(d, C5/C1, MAX/(C5/C1)); }
        public long toMillis(long d)  { return x(d, C5/C2, MAX/(C5/C2)); }
        public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
        public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
        public long toHours(long d)   { return d; }
        public long toDays(long d)    { return d/(C6/C5); }
        public long convert(long d, TimeUnit u) { return u.toHours(d); }
        int excessNanos(long d, long m) { return 0; }
    },

    /**
     * Time unit representing twenty four hours
     * @since 1.6
     */
    DAYS {
        public long toNanos(long d)   { return x(d, C6/C0, MAX/(C6/C0)); }
        public long toMicros(long d)  { return x(d, C6/C1, MAX/(C6/C1)); }
        public long toMillis(long d)  { return x(d, C6/C2, MAX/(C6/C2)); }
        public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
        public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
        public long toHours(long d)   { return x(d, C6/C5, MAX/(C6/C5)); }
        public long toDays(long d)    { return d; }
        public long convert(long d, TimeUnit u) { return u.toDays(d); }
        int excessNanos(long d, long m) { return 0; }
    };

    // Handy constants for conversion methods
    static final long C0 = 1L;
    static final long C1 = C0 * 1000L;
    static final long C2 = C1 * 1000L;
    static final long C3 = C2 * 1000L;
    static final long C4 = C3 * 60L;
    static final long C5 = C4 * 60L;
    static final long C6 = C5 * 24L;

    static final long MAX = Long.MAX_VALUE;

    /**
     * Scale d by m, checking for overflow.
     * This has a short name to make above code more readable.
     */
    static long x(long d, long m, long over) {
        if (d >  over) return Long.MAX_VALUE;
        if (d < -over) return Long.MIN_VALUE;
        return d * m;
    }

    // To maintain full signature compatibility with 1.5, and to improve the
    // clarity of the generated javadoc (see 6287639: Abstract methods in
    // enum classes should not be listed as abstract), method convert
    // etc. are not declared abstract but otherwise act as abstract methods.

    /**
     * Converts the given time duration in the given unit to this unit.
     * Conversions from finer to coarser granularities truncate, so
     * lose precision. For example, converting {@code 999} milliseconds
     * to seconds results in {@code 0}. Conversions from coarser to
     * finer granularities with arguments that would numerically
     * overflow saturate to {@code Long.MIN_VALUE} if negative or
     * {@code Long.MAX_VALUE} if positive.
     *
     * <p>For example, to convert 10 minutes to milliseconds, use:
     * {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
     *
     * @param sourceDuration the time duration in the given {@code sourceUnit}
     * @param sourceUnit the unit of the {@code sourceDuration} argument
     * @return the converted duration in this unit,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long convert(long sourceDuration, TimeUnit sourceUnit) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toNanos(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toMicros(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toMillis(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toSeconds(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     * @since 1.6
     */
    public long toMinutes(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     * @since 1.6
     */
    public long toHours(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration
     * @since 1.6
     */
    public long toDays(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Utility to compute the excess-nanosecond argument to wait,
     * sleep, join.
     * @param d the duration
     * @param m the number of milliseconds
     * @return the number of nanoseconds
     */
    abstract int excessNanos(long d, long m);

    /**
     * Performs a timed {@link Object#wait(long, int) Object.wait}
     * using this time unit.
     * This is a convenience method that converts timeout arguments
     * into the form required by the {@code Object.wait} method.
     *
     * <p>For example, you could implement a blocking {@code poll}
     * method (see {@link BlockingQueue#poll BlockingQueue.poll})
     * using:
     *
     *  <pre> {@code
     * public synchronized Object poll(long timeout, TimeUnit unit)
     *     throws InterruptedException {
     *   while (empty) {
     *     unit.timedWait(this, timeout);
     *     ...
     *   }
     * }}</pre>
     *
     * @param obj the object to wait on
     * @param timeout the maximum time to wait. If less than
     * or equal to zero, do not wait at all.
     * @throws InterruptedException if interrupted while waiting
     */
    public void timedWait(Object obj, long timeout)
            throws InterruptedException {
        if (timeout > 0) {
            long ms = toMillis(timeout);
            int ns = excessNanos(timeout, ms);
            obj.wait(ms, ns);
        }
    }

    /**
     * Performs a timed {@link Thread#join(long, int) Thread.join}
     * using this time unit.
     * This is a convenience method that converts time arguments into the
     * form required by the {@code Thread.join} method.
     *
     * @param thread the thread to wait for
     * @param timeout the maximum time to wait. If less than
     * or equal to zero, do not wait at all.
     * @throws InterruptedException if interrupted while waiting
     */
    public void timedJoin(Thread thread, long timeout)
            throws InterruptedException {
        if (timeout > 0) {
            long ms = toMillis(timeout);
            int ns = excessNanos(timeout, ms);
            thread.join(ms, ns);
        }
    }

    /**
     * Performs a {@link Thread#sleep(long, int) Thread.sleep} using
     * this time unit.
     * This is a convenience method that converts time arguments into the
     * form required by the {@code Thread.sleep} method.
     *
     * @param timeout the minimum time to sleep. If less than
     * or equal to zero, do not sleep at all.
     * @throws InterruptedException if interrupted while sleeping
     */
    public void sleep(long timeout) throws InterruptedException {
        if (timeout > 0) {
            long ms = toMillis(timeout);
            int ns = excessNanos(timeout, ms);
            Thread.sleep(ms, ns);
        }
    }

}
Revision:	1.4
Committed:	Wed Feb 4 09:04:24 2015 UTC (9 years, 3 months ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.3:	+3 -0 lines
Log Message:	add missing @since 1.6
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/publicdomain/zero/1.0/
5	*/
6
7	package java.util.concurrent;
8
9	/**
10	* A {@code TimeUnit} represents time durations at a given unit of
11	* granularity and provides utility methods to convert across units,
12	* and to perform timing and delay operations in these units. A
13	* {@code TimeUnit} does not maintain time information, but only
14	* helps organize and use time representations that may be maintained
15	* separately across various contexts. A nanosecond is defined as one
16	* thousandth of a microsecond, a microsecond as one thousandth of a
17	* millisecond, a millisecond as one thousandth of a second, a minute
18	* as sixty seconds, an hour as sixty minutes, and a day as twenty four
19	* hours.
20	*
21	* <p>A {@code TimeUnit} is mainly used to inform time-based methods
22	* how a given timing parameter should be interpreted. For example,
23	* the following code will timeout in 50 milliseconds if the {@link
24	* java.util.concurrent.locks.Lock lock} is not available:
25	*
26	* <pre> {@code
27	* Lock lock = ...;
28	* if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre>
29	*
30	* while this code will timeout in 50 seconds:
31	* <pre> {@code
32	* Lock lock = ...;
33	* if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre>
34	*
35	* Note however, that there is no guarantee that a particular timeout
36	* implementation will be able to notice the passage of time at the
37	* same granularity as the given {@code TimeUnit}.
38	*
39	* @since 1.5
40	* @author Doug Lea
41	*/
42	public enum TimeUnit {
43	/**
44	* Time unit representing one thousandth of a microsecond
45	*/
46	NANOSECONDS {
47	public long toNanos(long d) { return d; }
48	public long toMicros(long d) { return d/(C1/C0); }
49	public long toMillis(long d) { return d/(C2/C0); }
50	public long toSeconds(long d) { return d/(C3/C0); }
51	public long toMinutes(long d) { return d/(C4/C0); }
52	public long toHours(long d) { return d/(C5/C0); }
53	public long toDays(long d) { return d/(C6/C0); }
54	public long convert(long d, TimeUnit u) { return u.toNanos(d); }
55	int excessNanos(long d, long m) { return (int)(d - (m*C2)); }
56	},
57
58	/**
59	* Time unit representing one thousandth of a millisecond
60	*/
61	MICROSECONDS {
62	public long toNanos(long d) { return x(d, C1/C0, MAX/(C1/C0)); }
63	public long toMicros(long d) { return d; }
64	public long toMillis(long d) { return d/(C2/C1); }
65	public long toSeconds(long d) { return d/(C3/C1); }
66	public long toMinutes(long d) { return d/(C4/C1); }
67	public long toHours(long d) { return d/(C5/C1); }
68	public long toDays(long d) { return d/(C6/C1); }
69	public long convert(long d, TimeUnit u) { return u.toMicros(d); }
70	int excessNanos(long d, long m) { return (int)((dC1) - (mC2)); }
71	},
72
73	/**
74	* Time unit representing one thousandth of a second
75	*/
76	MILLISECONDS {
77	public long toNanos(long d) { return x(d, C2/C0, MAX/(C2/C0)); }
78	public long toMicros(long d) { return x(d, C2/C1, MAX/(C2/C1)); }
79	public long toMillis(long d) { return d; }
80	public long toSeconds(long d) { return d/(C3/C2); }
81	public long toMinutes(long d) { return d/(C4/C2); }
82	public long toHours(long d) { return d/(C5/C2); }
83	public long toDays(long d) { return d/(C6/C2); }
84	public long convert(long d, TimeUnit u) { return u.toMillis(d); }
85	int excessNanos(long d, long m) { return 0; }
86	},
87
88	/**
89	* Time unit representing one second
90	*/
91	SECONDS {
92	public long toNanos(long d) { return x(d, C3/C0, MAX/(C3/C0)); }
93	public long toMicros(long d) { return x(d, C3/C1, MAX/(C3/C1)); }
94	public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); }
95	public long toSeconds(long d) { return d; }
96	public long toMinutes(long d) { return d/(C4/C3); }
97	public long toHours(long d) { return d/(C5/C3); }
98	public long toDays(long d) { return d/(C6/C3); }
99	public long convert(long d, TimeUnit u) { return u.toSeconds(d); }
100	int excessNanos(long d, long m) { return 0; }
101	},
102
103	/**
104	* Time unit representing sixty seconds
105	* @since 1.6
106	*/
107	MINUTES {
108	public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
109	public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
110	public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
111	public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
112	public long toMinutes(long d) { return d; }
113	public long toHours(long d) { return d/(C5/C4); }
114	public long toDays(long d) { return d/(C6/C4); }
115	public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
116	int excessNanos(long d, long m) { return 0; }
117	},
118
119	/**
120	* Time unit representing sixty minutes
121	* @since 1.6
122	*/
123	HOURS {
124	public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); }
125	public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); }
126	public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); }
127	public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
128	public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
129	public long toHours(long d) { return d; }
130	public long toDays(long d) { return d/(C6/C5); }
131	public long convert(long d, TimeUnit u) { return u.toHours(d); }
132	int excessNanos(long d, long m) { return 0; }
133	},
134
135	/**
136	* Time unit representing twenty four hours
137	* @since 1.6
138	*/
139	DAYS {
140	public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); }
141	public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); }
142	public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); }
143	public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
144	public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
145	public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); }
146	public long toDays(long d) { return d; }
147	public long convert(long d, TimeUnit u) { return u.toDays(d); }
148	int excessNanos(long d, long m) { return 0; }
149	};
150
151	// Handy constants for conversion methods
152	static final long C0 = 1L;
153	static final long C1 = C0 * 1000L;
154	static final long C2 = C1 * 1000L;
155	static final long C3 = C2 * 1000L;
156	static final long C4 = C3 * 60L;
157	static final long C5 = C4 * 60L;
158	static final long C6 = C5 * 24L;
159
160	static final long MAX = Long.MAX_VALUE;
161
162	/**
163	* Scale d by m, checking for overflow.
164	* This has a short name to make above code more readable.
165	*/
166	static long x(long d, long m, long over) {
167	if (d > over) return Long.MAX_VALUE;
168	if (d < -over) return Long.MIN_VALUE;
169	return d * m;
170	}
171
172	// To maintain full signature compatibility with 1.5, and to improve the
173	// clarity of the generated javadoc (see 6287639: Abstract methods in
174	// enum classes should not be listed as abstract), method convert
175	// etc. are not declared abstract but otherwise act as abstract methods.
176
177	/**
178	* Converts the given time duration in the given unit to this unit.
179	* Conversions from finer to coarser granularities truncate, so
180	* lose precision. For example, converting {@code 999} milliseconds
181	* to seconds results in {@code 0}. Conversions from coarser to
182	* finer granularities with arguments that would numerically
183	* overflow saturate to {@code Long.MIN_VALUE} if negative or
184	* {@code Long.MAX_VALUE} if positive.
185	*
186	* <p>For example, to convert 10 minutes to milliseconds, use:
187	* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
188	*
189	* @param sourceDuration the time duration in the given {@code sourceUnit}
190	* @param sourceUnit the unit of the {@code sourceDuration} argument
191	* @return the converted duration in this unit,
192	* or {@code Long.MIN_VALUE} if conversion would negatively
193	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
194	*/
195	public long convert(long sourceDuration, TimeUnit sourceUnit) {
196	throw new AbstractMethodError();
197	}
198
199	/**
200	* Equivalent to
201	* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
202	* @param duration the duration
203	* @return the converted duration,
204	* or {@code Long.MIN_VALUE} if conversion would negatively
205	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
206	*/
207	public long toNanos(long duration) {
208	throw new AbstractMethodError();
209	}
210
211	/**
212	* Equivalent to
213	* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
214	* @param duration the duration
215	* @return the converted duration,
216	* or {@code Long.MIN_VALUE} if conversion would negatively
217	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
218	*/
219	public long toMicros(long duration) {
220	throw new AbstractMethodError();
221	}
222
223	/**
224	* Equivalent to
225	* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
226	* @param duration the duration
227	* @return the converted duration,
228	* or {@code Long.MIN_VALUE} if conversion would negatively
229	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
230	*/
231	public long toMillis(long duration) {
232	throw new AbstractMethodError();
233	}
234
235	/**
236	* Equivalent to
237	* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
238	* @param duration the duration
239	* @return the converted duration,
240	* or {@code Long.MIN_VALUE} if conversion would negatively
241	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
242	*/
243	public long toSeconds(long duration) {
244	throw new AbstractMethodError();
245	}
246
247	/**
248	* Equivalent to
249	* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
250	* @param duration the duration
251	* @return the converted duration,
252	* or {@code Long.MIN_VALUE} if conversion would negatively
253	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
254	* @since 1.6
255	*/
256	public long toMinutes(long duration) {
257	throw new AbstractMethodError();
258	}
259
260	/**
261	* Equivalent to
262	* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
263	* @param duration the duration
264	* @return the converted duration,
265	* or {@code Long.MIN_VALUE} if conversion would negatively
266	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
267	* @since 1.6
268	*/
269	public long toHours(long duration) {
270	throw new AbstractMethodError();
271	}
272
273	/**
274	* Equivalent to
275	* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
276	* @param duration the duration
277	* @return the converted duration
278	* @since 1.6
279	*/
280	public long toDays(long duration) {
281	throw new AbstractMethodError();
282	}
283
284	/**
285	* Utility to compute the excess-nanosecond argument to wait,
286	* sleep, join.
287	* @param d the duration
288	* @param m the number of milliseconds
289	* @return the number of nanoseconds
290	*/
291	abstract int excessNanos(long d, long m);
292
293	/**
294	* Performs a timed {@link Object#wait(long, int) Object.wait}
295	* using this time unit.
296	* This is a convenience method that converts timeout arguments
297	* into the form required by the {@code Object.wait} method.
298	*
299	* <p>For example, you could implement a blocking {@code poll}
300	* method (see {@link BlockingQueue#poll BlockingQueue.poll})
301	* using:
302	*
303	* <pre> {@code
304	* public synchronized Object poll(long timeout, TimeUnit unit)
305	* throws InterruptedException {
306	* while (empty) {
307	* unit.timedWait(this, timeout);
308	* ...
309	* }
310	* }}</pre>
311	*
312	* @param obj the object to wait on
313	* @param timeout the maximum time to wait. If less than
314	* or equal to zero, do not wait at all.
315	* @throws InterruptedException if interrupted while waiting
316	*/
317	public void timedWait(Object obj, long timeout)
318	throws InterruptedException {
319	if (timeout > 0) {
320	long ms = toMillis(timeout);
321	int ns = excessNanos(timeout, ms);
322	obj.wait(ms, ns);
323	}
324	}
325
326	/**
327	* Performs a timed {@link Thread#join(long, int) Thread.join}
328	* using this time unit.
329	* This is a convenience method that converts time arguments into the
330	* form required by the {@code Thread.join} method.
331	*
332	* @param thread the thread to wait for
333	* @param timeout the maximum time to wait. If less than
334	* or equal to zero, do not wait at all.
335	* @throws InterruptedException if interrupted while waiting
336	*/
337	public void timedJoin(Thread thread, long timeout)
338	throws InterruptedException {
339	if (timeout > 0) {
340	long ms = toMillis(timeout);
341	int ns = excessNanos(timeout, ms);
342	thread.join(ms, ns);
343	}
344	}
345
346	/**
347	* Performs a {@link Thread#sleep(long, int) Thread.sleep} using
348	* this time unit.
349	* This is a convenience method that converts time arguments into the
350	* form required by the {@code Thread.sleep} method.
351	*
352	* @param timeout the minimum time to sleep. If less than
353	* or equal to zero, do not sleep at all.
354	* @throws InterruptedException if interrupted while sleeping
355	*/
356	public void sleep(long timeout) throws InterruptedException {
357	if (timeout > 0) {
358	long ms = toMillis(timeout);
359	int ns = excessNanos(timeout, ms);
360	Thread.sleep(ms, ns);
361	}
362	}
363
364	}