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/licenses/publicdomain
  */

package java.util.concurrent;

/**
 * A <tt>TimeUnit</tt> 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
 * <tt>TimeUnit</tt> 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 <tt>TimeUnit</tt> 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>  Lock lock = ...;
 *  if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ...
 * </pre>
 * while this code will timeout in 50 seconds:
 * <pre>
 *  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 <tt>TimeUnit</tt>.
 *
 * @since 1.5
 * @author Doug Lea
 */
public enum TimeUnit {
    NANOSECONDS (0) {
        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)); }
    },
    MICROSECONDS (1) {
        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)); }
    },
    MILLISECONDS (2) {
        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; }
    },
    SECONDS (3) {
        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; }
    },
    MINUTES (4) {
        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; }
    },
    HOURS (5) {
        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; }
    },
    DAYS (6) {
        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; }
    };

    /**
     * The index of this unit. This value is no longer used in this
     * version of this class, but is retained for serialization
     * compatibility with previous version.
     */
    private final int index;

    /** Internal constructor */
    TimeUnit(int index) {
        this.index = index;
    }

    // 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, method
    // convert etc are not declared abstract but otherwise act as
    // abstract methods.

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

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

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

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

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

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

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

    /**
     * Equivalent to <tt>DAYS.convert(duration, this)</tt>.
     * @param duration the duration
     * @return the converted duration
     * @see #convert
     * @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 <tt>Object.wait</tt> using this time unit.
     * This is a convenience method that converts timeout arguments
     * into the form required by the <tt>Object.wait</tt> method.
     *
     * <p>For example, you could implement a blocking <tt>poll</tt>
     * method (see {@link BlockingQueue#poll BlockingQueue.poll})
     * using:
     *
     * <pre>  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.
     * @see Object#wait(long, int)
     */
    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 <tt>Thread.join</tt> using this time unit.
     * This is a convenience method that converts time arguments into the
     * form required by the <tt>Thread.join</tt> 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.
     * @see Thread#join(long, int)
     */
    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 <tt>Thread.sleep</tt> using this unit.
     * This is a convenience method that converts time arguments into the
     * form required by the <tt>Thread.sleep</tt> 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.
     * @see Thread#sleep
     */
    public void sleep(long timeout) throws InterruptedException {
        if (timeout > 0) {
            long ms = toMillis(timeout);
            int ns = excessNanos(timeout, ms);
            Thread.sleep(ms, ns);
        }
    }

}
Revision:	1.32
Committed:	Sat Jun 18 12:03:05 2005 UTC (18 years, 11 months ago) by dl
Branch:	MAIN
Changes since 1.31:	+33 -10 lines
Log Message:	Avoid "abstract" to ensure signature compatibility
#	User	Rev	Content
1	dl	1.2	/*
2	dl	1.22	* 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/licenses/publicdomain
5			*/
6	dl	1.2
7	tim	1.1	package java.util.concurrent;
8
9			/**
10	dl	1.27	* A <tt>TimeUnit</tt> 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			* <tt>TimeUnit</tt> 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 <tt>TimeUnit</tt> 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> Lock lock = ...;
27			* if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ...
28			* </pre>
29			* while this code will timeout in 50 seconds:
30			* <pre>
31			* Lock lock = ...;
32			* if ( lock.tryLock(50L, TimeUnit.SECONDS) ) ...
33			* </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 <tt>TimeUnit</tt>.
38			*
39			* @since 1.5
40			* @author Doug Lea
41			*/
42	dl	1.20	public enum TimeUnit {
43	dl	1.27	NANOSECONDS (0) {
44			public long toNanos(long d) { return d; }
45			public long toMicros(long d) { return d/(C1/C0); }
46			public long toMillis(long d) { return d/(C2/C0); }
47			public long toSeconds(long d) { return d/(C3/C0); }
48			public long toMinutes(long d) { return d/(C4/C0); }
49			public long toHours(long d) { return d/(C5/C0); }
50			public long toDays(long d) { return d/(C6/C0); }
51			public long convert(long d, TimeUnit u) { return u.toNanos(d); }
52			int excessNanos(long d, long m) { return (int)(d - (m*C2)); }
53			},
54			MICROSECONDS (1) {
55			public long toNanos(long d) { return x(d, C1/C0, MAX/(C1/C0)); }
56			public long toMicros(long d) { return d; }
57			public long toMillis(long d) { return d/(C2/C1); }
58			public long toSeconds(long d) { return d/(C3/C1); }
59			public long toMinutes(long d) { return d/(C4/C1); }
60			public long toHours(long d) { return d/(C5/C1); }
61			public long toDays(long d) { return d/(C6/C1); }
62			public long convert(long d, TimeUnit u) { return u.toMicros(d); }
63			int excessNanos(long d, long m) { return (int)((dC1) - (mC2)); }
64			},
65			MILLISECONDS (2) {
66			public long toNanos(long d) { return x(d, C2/C0, MAX/(C2/C0)); }
67			public long toMicros(long d) { return x(d, C2/C1, MAX/(C2/C1)); }
68			public long toMillis(long d) { return d; }
69			public long toSeconds(long d) { return d/(C3/C2); }
70			public long toMinutes(long d) { return d/(C4/C2); }
71			public long toHours(long d) { return d/(C5/C2); }
72			public long toDays(long d) { return d/(C6/C2); }
73			public long convert(long d, TimeUnit u) { return u.toMillis(d); }
74			int excessNanos(long d, long m) { return 0; }
75			},
76			SECONDS (3) {
77			public long toNanos(long d) { return x(d, C3/C0, MAX/(C3/C0)); }
78			public long toMicros(long d) { return x(d, C3/C1, MAX/(C3/C1)); }
79			public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); }
80			public long toSeconds(long d) { return d; }
81			public long toMinutes(long d) { return d/(C4/C3); }
82			public long toHours(long d) { return d/(C5/C3); }
83			public long toDays(long d) { return d/(C6/C3); }
84			public long convert(long d, TimeUnit u) { return u.toSeconds(d); }
85			int excessNanos(long d, long m) { return 0; }
86			},
87			MINUTES (4) {
88			public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
89			public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
90			public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
91			public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
92			public long toMinutes(long d) { return d; }
93			public long toHours(long d) { return d/(C5/C4); }
94			public long toDays(long d) { return d/(C6/C4); }
95			public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
96			int excessNanos(long d, long m) { return 0; }
97			},
98			HOURS (5) {
99			public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); }
100			public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); }
101			public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); }
102			public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
103			public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
104			public long toHours(long d) { return d; }
105			public long toDays(long d) { return d/(C6/C5); }
106			public long convert(long d, TimeUnit u) { return u.toHours(d); }
107			int excessNanos(long d, long m) { return 0; }
108			},
109			DAYS (6) {
110			public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); }
111			public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); }
112			public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); }
113			public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
114			public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
115			public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); }
116			public long toDays(long d) { return d; }
117			public long convert(long d, TimeUnit u) { return u.toDays(d); }
118			int excessNanos(long d, long m) { return 0; }
119			};
120	jsr166	1.29
121	dl	1.27	/**
122			* The index of this unit. This value is no longer used in this
123			* version of this class, but is retained for serialization
124			* compatibility with previous version.
125			*/
126			private final int index;
127	jsr166	1.29
128	dl	1.27	/** Internal constructor */
129			TimeUnit(int index) {
130			this.index = index;
131			}
132	jsr166	1.29
133	dl	1.27	// Handy constants for conversion methods
134			static final long C0 = 1L;
135			static final long C1 = C0 * 1000L;
136			static final long C2 = C1 * 1000L;
137			static final long C3 = C2 * 1000L;
138			static final long C4 = C3 * 60L;
139			static final long C5 = C4 * 60L;
140			static final long C6 = C5 * 24L;
141	jsr166	1.29
142	dl	1.27	static final long MAX = Long.MAX_VALUE;
143	jsr166	1.29
144	dl	1.27	/**
145			* Scale d by m, checking for overflow.
146			* This has a short name to make above code more readable.
147			*/
148			static long x(long d, long m, long over) {
149			if (d > over) return Long.MAX_VALUE;
150			if (d < -over) return Long.MIN_VALUE;
151			return d * m;
152			}
153	jsr166	1.29
154	dl	1.32	// To maintain full signature compatibility with 1.5, method
155			// convert etc are not declared abstract but otherwise act as
156			// abstract methods.
157
158	dl	1.27	/**
159			* Convert the given time duration in the given unit to this
160			* unit. Conversions from finer to coarser granularities
161			* truncate, so lose precision. For example converting
162			* <tt>999</tt> milliseconds to seconds results in
163			* <tt>0</tt>. Conversions from coarser to finer granularities
164			* with arguments that would numerically overflow saturate to
165			* <tt>Long.MIN_VALUE</tt> if negative or <tt>Long.MAX_VALUE</tt>
166			* if positive.
167	dl	1.32	* <p>
168			* For example, to convert 10 minutes to milliseconds, use:
169			* <tt>TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)</tt>
170	dl	1.27	*
171	dl	1.32	* @param sourceDuration the time duration in the given <tt>unit</tt>
172			* @param sourceUnit the unit of the <tt>sourceDuration</tt> argument
173	dl	1.27	* @return the converted duration in this unit,
174			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
175			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
176			*/
177	dl	1.32	public long convert(long sourceDuration, TimeUnit sourceUnit) {
178			throw new AbstractMethodError();
179			}
180	jsr166	1.29
181	dl	1.27	/**
182			* Equivalent to <tt>NANOSECONDS.convert(duration, this)</tt>.
183			* @param duration the duration
184			* @return the converted duration,
185			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
186			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
187			* @see #convert
188			*/
189	dl	1.32	public long toNanos(long duration) {
190			throw new AbstractMethodError();
191			}
192	jsr166	1.29
193	dl	1.27	/**
194			* Equivalent to <tt>MICROSECONDS.convert(duration, this)</tt>.
195			* @param duration the duration
196			* @return the converted duration,
197			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
198			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
199			* @see #convert
200			*/
201	dl	1.32	public long toMicros(long duration) {
202			throw new AbstractMethodError();
203			}
204	jsr166	1.29
205	dl	1.27	/**
206			* Equivalent to <tt>MILLISECONDS.convert(duration, this)</tt>.
207			* @param duration the duration
208			* @return the converted duration,
209			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
210			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
211			* @see #convert
212			*/
213	dl	1.32	public long toMillis(long duration) {
214			throw new AbstractMethodError();
215			}
216	jsr166	1.29
217	dl	1.27	/**
218			* Equivalent to <tt>SECONDS.convert(duration, this)</tt>.
219			* @param duration the duration
220			* @return the converted duration,
221			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
222			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
223			* @see #convert
224			*/
225	dl	1.32	public long toSeconds(long duration) {
226			throw new AbstractMethodError();
227			}
228	jsr166	1.29
229	dl	1.27	/**
230			* Equivalent to <tt>MINUTES.convert(duration, this)</tt>.
231			* @param duration the duration
232			* @return the converted duration,
233			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
234			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
235			* @see #convert
236	dl	1.31	* @since 1.6
237	dl	1.27	*/
238	dl	1.32	public long toMinutes(long duration) {
239			throw new AbstractMethodError();
240			}
241	jsr166	1.29
242	dl	1.27	/**
243			* Equivalent to <tt>HOURS.convert(duration, this)</tt>.
244			* @param duration the duration
245			* @return the converted duration,
246			* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
247			* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
248			* @see #convert
249	dl	1.31	* @since 1.6
250	dl	1.27	*/
251	dl	1.32	public long toHours(long duration) {
252			throw new AbstractMethodError();
253			}
254	jsr166	1.29
255	dl	1.27	/**
256			* Equivalent to <tt>DAYS.convert(duration, this)</tt>.
257			* @param duration the duration
258			* @return the converted duration
259			* @see #convert
260	dl	1.31	* @since 1.6
261	dl	1.27	*/
262	dl	1.32	public long toDays(long duration) {
263			throw new AbstractMethodError();
264			}
265	jsr166	1.29
266	dl	1.27	/**
267			* Utility to compute the excess-nanosecond argument to wait,
268			* sleep, join.
269			* @param d the duration
270			* @param m the number of milliseconds
271			* @return the number of nanoseconds
272			*/
273			abstract int excessNanos(long d, long m);
274	jsr166	1.29
275	dl	1.27	/**
276	jsr166	1.29	* Performs a timed <tt>Object.wait</tt> using this time unit.
277	dl	1.27	* This is a convenience method that converts timeout arguments
278			* into the form required by the <tt>Object.wait</tt> method.
279			*
280			* <p>For example, you could implement a blocking <tt>poll</tt>
281			* method (see {@link BlockingQueue#poll BlockingQueue.poll})
282			* using:
283			*
284	jsr166	1.30	* <pre> public synchronized Object poll(long timeout, TimeUnit unit) throws InterruptedException {
285	dl	1.27	* while (empty) {
286			* unit.timedWait(this, timeout);
287			* ...
288			* }
289			* }</pre>
290			*
291			* @param obj the object to wait on
292	dl	1.28	* @param timeout the maximum time to wait. If less than
293			* or equal to zero, do not wait at all.
294	dl	1.27	* @throws InterruptedException if interrupted while waiting.
295			* @see Object#wait(long, int)
296			*/
297			public void timedWait(Object obj, long timeout)
298			throws InterruptedException {
299			if (timeout > 0) {
300			long ms = toMillis(timeout);
301			int ns = excessNanos(timeout, ms);
302			obj.wait(ms, ns);
303			}
304			}
305	jsr166	1.29
306	dl	1.27	/**
307	jsr166	1.29	* Performs a timed <tt>Thread.join</tt> using this time unit.
308	dl	1.27	* This is a convenience method that converts time arguments into the
309			* form required by the <tt>Thread.join</tt> method.
310			* @param thread the thread to wait for
311	dl	1.28	* @param timeout the maximum time to wait. If less than
312			* or equal to zero, do not wait at all.
313	dl	1.27	* @throws InterruptedException if interrupted while waiting.
314			* @see Thread#join(long, int)
315			*/
316			public void timedJoin(Thread thread, long timeout)
317			throws InterruptedException {
318			if (timeout > 0) {
319			long ms = toMillis(timeout);
320			int ns = excessNanos(timeout, ms);
321			thread.join(ms, ns);
322			}
323			}
324	jsr166	1.29
325	dl	1.27	/**
326	jsr166	1.29	* Performs a <tt>Thread.sleep</tt> using this unit.
327	dl	1.27	* This is a convenience method that converts time arguments into the
328			* form required by the <tt>Thread.sleep</tt> method.
329	dl	1.28	* @param timeout the minimum time to sleep. If less than
330			* or equal to zero, do not sleep at all.
331	dl	1.27	* @throws InterruptedException if interrupted while sleeping.
332			* @see Thread#sleep
333			*/
334			public void sleep(long timeout) throws InterruptedException {
335			if (timeout > 0) {
336			long ms = toMillis(timeout);
337			int ns = excessNanos(timeout, ms);
338			Thread.sleep(ms, ns);
339			}
340			}
341	jsr166	1.29
342	tim	1.1	}