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
     */
    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
     */
    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
     */
    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:	1.43
Committed:	Wed Jul 17 21:17:43 2013 UTC (10 years, 10 months ago) by jsr166
Branch:	MAIN
Changes since 1.42:	+27 -0 lines
Log Message:	fix doclint warnings
#	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	*/
106	MINUTES {
107	public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
108	public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
109	public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
110	public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
111	public long toMinutes(long d) { return d; }
112	public long toHours(long d) { return d/(C5/C4); }
113	public long toDays(long d) { return d/(C6/C4); }
114	public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
115	int excessNanos(long d, long m) { return 0; }
116	},
117
118	/**
119	* Time unit representing sixty minutes
120	*/
121	HOURS {
122	public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); }
123	public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); }
124	public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); }
125	public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
126	public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
127	public long toHours(long d) { return d; }
128	public long toDays(long d) { return d/(C6/C5); }
129	public long convert(long d, TimeUnit u) { return u.toHours(d); }
130	int excessNanos(long d, long m) { return 0; }
131	},
132
133	/**
134	* Time unit representing twenty four hours
135	*/
136	DAYS {
137	public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); }
138	public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); }
139	public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); }
140	public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
141	public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
142	public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); }
143	public long toDays(long d) { return d; }
144	public long convert(long d, TimeUnit u) { return u.toDays(d); }
145	int excessNanos(long d, long m) { return 0; }
146	};
147
148	// Handy constants for conversion methods
149	static final long C0 = 1L;
150	static final long C1 = C0 * 1000L;
151	static final long C2 = C1 * 1000L;
152	static final long C3 = C2 * 1000L;
153	static final long C4 = C3 * 60L;
154	static final long C5 = C4 * 60L;
155	static final long C6 = C5 * 24L;
156
157	static final long MAX = Long.MAX_VALUE;
158
159	/**
160	* Scale d by m, checking for overflow.
161	* This has a short name to make above code more readable.
162	*/
163	static long x(long d, long m, long over) {
164	if (d > over) return Long.MAX_VALUE;
165	if (d < -over) return Long.MIN_VALUE;
166	return d * m;
167	}
168
169	// To maintain full signature compatibility with 1.5, and to improve the
170	// clarity of the generated javadoc (see 6287639: Abstract methods in
171	// enum classes should not be listed as abstract), method convert
172	// etc. are not declared abstract but otherwise act as abstract methods.
173
174	/**
175	* Converts the given time duration in the given unit to this unit.
176	* Conversions from finer to coarser granularities truncate, so
177	* lose precision. For example, converting {@code 999} milliseconds
178	* to seconds results in {@code 0}. Conversions from coarser to
179	* finer granularities with arguments that would numerically
180	* overflow saturate to {@code Long.MIN_VALUE} if negative or
181	* {@code Long.MAX_VALUE} if positive.
182	*
183	* <p>For example, to convert 10 minutes to milliseconds, use:
184	* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
185	*
186	* @param sourceDuration the time duration in the given {@code sourceUnit}
187	* @param sourceUnit the unit of the {@code sourceDuration} argument
188	* @return the converted duration in this unit,
189	* or {@code Long.MIN_VALUE} if conversion would negatively
190	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
191	*/
192	public long convert(long sourceDuration, TimeUnit sourceUnit) {
193	throw new AbstractMethodError();
194	}
195
196	/**
197	* Equivalent to
198	* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
199	* @param duration the duration
200	* @return the converted duration,
201	* or {@code Long.MIN_VALUE} if conversion would negatively
202	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
203	*/
204	public long toNanos(long duration) {
205	throw new AbstractMethodError();
206	}
207
208	/**
209	* Equivalent to
210	* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
211	* @param duration the duration
212	* @return the converted duration,
213	* or {@code Long.MIN_VALUE} if conversion would negatively
214	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
215	*/
216	public long toMicros(long duration) {
217	throw new AbstractMethodError();
218	}
219
220	/**
221	* Equivalent to
222	* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
223	* @param duration the duration
224	* @return the converted duration,
225	* or {@code Long.MIN_VALUE} if conversion would negatively
226	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
227	*/
228	public long toMillis(long duration) {
229	throw new AbstractMethodError();
230	}
231
232	/**
233	* Equivalent to
234	* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
235	* @param duration the duration
236	* @return the converted duration,
237	* or {@code Long.MIN_VALUE} if conversion would negatively
238	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
239	*/
240	public long toSeconds(long duration) {
241	throw new AbstractMethodError();
242	}
243
244	/**
245	* Equivalent to
246	* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
247	* @param duration the duration
248	* @return the converted duration,
249	* or {@code Long.MIN_VALUE} if conversion would negatively
250	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
251	* @since 1.6
252	*/
253	public long toMinutes(long duration) {
254	throw new AbstractMethodError();
255	}
256
257	/**
258	* Equivalent to
259	* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
260	* @param duration the duration
261	* @return the converted duration,
262	* or {@code Long.MIN_VALUE} if conversion would negatively
263	* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
264	* @since 1.6
265	*/
266	public long toHours(long duration) {
267	throw new AbstractMethodError();
268	}
269
270	/**
271	* Equivalent to
272	* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
273	* @param duration the duration
274	* @return the converted duration
275	* @since 1.6
276	*/
277	public long toDays(long duration) {
278	throw new AbstractMethodError();
279	}
280
281	/**
282	* Utility to compute the excess-nanosecond argument to wait,
283	* sleep, join.
284	* @param d the duration
285	* @param m the number of milliseconds
286	* @return the number of nanoseconds
287	*/
288	abstract int excessNanos(long d, long m);
289
290	/**
291	* Performs a timed {@link Object#wait(long, int) Object.wait}
292	* using this time unit.
293	* This is a convenience method that converts timeout arguments
294	* into the form required by the {@code Object.wait} method.
295	*
296	* <p>For example, you could implement a blocking {@code poll}
297	* method (see {@link BlockingQueue#poll BlockingQueue.poll})
298	* using:
299	*
300	* <pre> {@code
301	* public synchronized Object poll(long timeout, TimeUnit unit)
302	* throws InterruptedException {
303	* while (empty) {
304	* unit.timedWait(this, timeout);
305	* ...
306	* }
307	* }}</pre>
308	*
309	* @param obj the object to wait on
310	* @param timeout the maximum time to wait. If less than
311	* or equal to zero, do not wait at all.
312	* @throws InterruptedException if interrupted while waiting
313	*/
314	public void timedWait(Object obj, long timeout)
315	throws InterruptedException {
316	if (timeout > 0) {
317	long ms = toMillis(timeout);
318	int ns = excessNanos(timeout, ms);
319	obj.wait(ms, ns);
320	}
321	}
322
323	/**
324	* Performs a timed {@link Thread#join(long, int) Thread.join}
325	* using this time unit.
326	* This is a convenience method that converts time arguments into the
327	* form required by the {@code Thread.join} method.
328	*
329	* @param thread the thread to wait for
330	* @param timeout the maximum time to wait. If less than
331	* or equal to zero, do not wait at all.
332	* @throws InterruptedException if interrupted while waiting
333	*/
334	public void timedJoin(Thread thread, long timeout)
335	throws InterruptedException {
336	if (timeout > 0) {
337	long ms = toMillis(timeout);
338	int ns = excessNanos(timeout, ms);
339	thread.join(ms, ns);
340	}
341	}
342
343	/**
344	* Performs a {@link Thread#sleep(long, int) Thread.sleep} using
345	* this time unit.
346	* This is a convenience method that converts time arguments into the
347	* form required by the {@code Thread.sleep} method.
348	*
349	* @param timeout the minimum time to sleep. If less than
350	* or equal to zero, do not sleep at all.
351	* @throws InterruptedException if interrupted while sleeping
352	*/
353	public void sleep(long timeout) throws InterruptedException {
354	if (timeout > 0) {
355	long ms = toMillis(timeout);
356	int ns = excessNanos(timeout, ms);
357	Thread.sleep(ms, ns);
358	}
359	}
360
361	}