80 |
|
* in security-sensitive applications. Additionally, |
81 |
|
* default-constructed instances do not use a cryptographically random |
82 |
|
* seed unless the {@linkplain System#getProperty system property} |
83 |
< |
* {@code java.util.secureRandomSeed} is set to {@code true}. |
83 |
> |
* {@systemProperty java.util.secureRandomSeed} is set to {@code true}. |
84 |
|
* |
85 |
|
* @author Guy Steele |
86 |
|
* @author Doug Lea |
219 |
|
return seed += gamma; |
220 |
|
} |
221 |
|
|
222 |
+ |
// IllegalArgumentException messages |
223 |
+ |
static final String BAD_BOUND = "bound must be positive"; |
224 |
+ |
static final String BAD_RANGE = "bound must be greater than origin"; |
225 |
+ |
static final String BAD_SIZE = "size must be non-negative"; |
226 |
+ |
|
227 |
|
/** |
228 |
|
* The seed generator for default constructors. |
229 |
|
*/ |
230 |
< |
private static final AtomicLong defaultGen = new AtomicLong(initialSeed()); |
231 |
< |
|
232 |
< |
private static long initialSeed() { |
233 |
< |
String pp = java.security.AccessController.doPrivileged( |
234 |
< |
new sun.security.action.GetPropertyAction( |
235 |
< |
"java.util.secureRandomSeed")); |
236 |
< |
if (pp != null && pp.equalsIgnoreCase("true")) { |
230 |
> |
private static final AtomicLong defaultGen |
231 |
> |
= new AtomicLong(mix64(System.currentTimeMillis()) ^ |
232 |
> |
mix64(System.nanoTime())); |
233 |
> |
|
234 |
> |
// at end of <clinit> to survive static initialization circularity |
235 |
> |
static { |
236 |
> |
if (java.security.AccessController.doPrivileged( |
237 |
> |
new java.security.PrivilegedAction<Boolean>() { |
238 |
> |
public Boolean run() { |
239 |
> |
return Boolean.getBoolean("java.util.secureRandomSeed"); |
240 |
> |
}})) { |
241 |
|
byte[] seedBytes = java.security.SecureRandom.getSeed(8); |
242 |
< |
long s = (long)(seedBytes[0]) & 0xffL; |
242 |
> |
long s = (long)seedBytes[0] & 0xffL; |
243 |
|
for (int i = 1; i < 8; ++i) |
244 |
< |
s = (s << 8) | ((long)(seedBytes[i]) & 0xffL); |
245 |
< |
return s; |
244 |
> |
s = (s << 8) | ((long)seedBytes[i] & 0xffL); |
245 |
> |
defaultGen.set(s); |
246 |
|
} |
238 |
– |
return (mix64(System.currentTimeMillis()) ^ |
239 |
– |
mix64(System.nanoTime())); |
247 |
|
} |
248 |
|
|
242 |
– |
// IllegalArgumentException messages |
243 |
– |
static final String BadBound = "bound must be positive"; |
244 |
– |
static final String BadRange = "bound must be greater than origin"; |
245 |
– |
static final String BadSize = "size must be non-negative"; |
246 |
– |
|
249 |
|
/* |
250 |
|
* Internal versions of nextX methods used by streams, as well as |
251 |
|
* the public nextX(origin, bound) methods. These exist mainly to |
375 |
|
* may, and typically does, vary across program invocations. |
376 |
|
*/ |
377 |
|
public SplittableRandom() { // emulate defaultGen.split() |
378 |
< |
long s = defaultGen.getAndAdd(2 * GOLDEN_GAMMA); |
378 |
> |
long s = defaultGen.getAndAdd(GOLDEN_GAMMA << 1); |
379 |
|
this.seed = mix64(s); |
380 |
|
this.gamma = mixGamma(s + GOLDEN_GAMMA); |
381 |
|
} |
399 |
|
} |
400 |
|
|
401 |
|
/** |
402 |
+ |
* Fills a user-supplied byte array with generated pseudorandom bytes. |
403 |
+ |
* |
404 |
+ |
* @param bytes the byte array to fill with pseudorandom bytes |
405 |
+ |
* @throws NullPointerException if bytes is null |
406 |
+ |
* @since 10 |
407 |
+ |
*/ |
408 |
+ |
public void nextBytes(byte[] bytes) { |
409 |
+ |
int i = 0; |
410 |
+ |
int len = bytes.length; |
411 |
+ |
for (int words = len >> 3; words--> 0; ) { |
412 |
+ |
long rnd = nextLong(); |
413 |
+ |
for (int n = 8; n--> 0; rnd >>>= Byte.SIZE) |
414 |
+ |
bytes[i++] = (byte)rnd; |
415 |
+ |
} |
416 |
+ |
if (i < len) |
417 |
+ |
for (long rnd = nextLong(); i < len; rnd >>>= Byte.SIZE) |
418 |
+ |
bytes[i++] = (byte)rnd; |
419 |
+ |
} |
420 |
+ |
|
421 |
+ |
/** |
422 |
|
* Returns a pseudorandom {@code int} value. |
423 |
|
* |
424 |
|
* @return a pseudorandom {@code int} value |
438 |
|
*/ |
439 |
|
public int nextInt(int bound) { |
440 |
|
if (bound <= 0) |
441 |
< |
throw new IllegalArgumentException(BadBound); |
441 |
> |
throw new IllegalArgumentException(BAD_BOUND); |
442 |
|
// Specialize internalNextInt for origin 0 |
443 |
|
int r = mix32(nextSeed()); |
444 |
|
int m = bound - 1; |
466 |
|
*/ |
467 |
|
public int nextInt(int origin, int bound) { |
468 |
|
if (origin >= bound) |
469 |
< |
throw new IllegalArgumentException(BadRange); |
469 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
470 |
|
return internalNextInt(origin, bound); |
471 |
|
} |
472 |
|
|
490 |
|
*/ |
491 |
|
public long nextLong(long bound) { |
492 |
|
if (bound <= 0) |
493 |
< |
throw new IllegalArgumentException(BadBound); |
493 |
> |
throw new IllegalArgumentException(BAD_BOUND); |
494 |
|
// Specialize internalNextLong for origin 0 |
495 |
|
long r = mix64(nextSeed()); |
496 |
|
long m = bound - 1; |
518 |
|
*/ |
519 |
|
public long nextLong(long origin, long bound) { |
520 |
|
if (origin >= bound) |
521 |
< |
throw new IllegalArgumentException(BadRange); |
521 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
522 |
|
return internalNextLong(origin, bound); |
523 |
|
} |
524 |
|
|
544 |
|
*/ |
545 |
|
public double nextDouble(double bound) { |
546 |
|
if (!(bound > 0.0)) |
547 |
< |
throw new IllegalArgumentException(BadBound); |
547 |
> |
throw new IllegalArgumentException(BAD_BOUND); |
548 |
|
double result = (mix64(nextSeed()) >>> 11) * DOUBLE_UNIT * bound; |
549 |
|
return (result < bound) ? result : // correct for rounding |
550 |
|
Double.longBitsToDouble(Double.doubleToLongBits(bound) - 1); |
563 |
|
*/ |
564 |
|
public double nextDouble(double origin, double bound) { |
565 |
|
if (!(origin < bound)) |
566 |
< |
throw new IllegalArgumentException(BadRange); |
566 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
567 |
|
return internalNextDouble(origin, bound); |
568 |
|
} |
569 |
|
|
591 |
|
*/ |
592 |
|
public IntStream ints(long streamSize) { |
593 |
|
if (streamSize < 0L) |
594 |
< |
throw new IllegalArgumentException(BadSize); |
594 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
595 |
|
return StreamSupport.intStream |
596 |
|
(new RandomIntsSpliterator |
597 |
|
(this, 0L, streamSize, Integer.MAX_VALUE, 0), |
632 |
|
public IntStream ints(long streamSize, int randomNumberOrigin, |
633 |
|
int randomNumberBound) { |
634 |
|
if (streamSize < 0L) |
635 |
< |
throw new IllegalArgumentException(BadSize); |
635 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
636 |
|
if (randomNumberOrigin >= randomNumberBound) |
637 |
< |
throw new IllegalArgumentException(BadRange); |
637 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
638 |
|
return StreamSupport.intStream |
639 |
|
(new RandomIntsSpliterator |
640 |
|
(this, 0L, streamSize, randomNumberOrigin, randomNumberBound), |
658 |
|
*/ |
659 |
|
public IntStream ints(int randomNumberOrigin, int randomNumberBound) { |
660 |
|
if (randomNumberOrigin >= randomNumberBound) |
661 |
< |
throw new IllegalArgumentException(BadRange); |
661 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
662 |
|
return StreamSupport.intStream |
663 |
|
(new RandomIntsSpliterator |
664 |
|
(this, 0L, Long.MAX_VALUE, randomNumberOrigin, randomNumberBound), |
677 |
|
*/ |
678 |
|
public LongStream longs(long streamSize) { |
679 |
|
if (streamSize < 0L) |
680 |
< |
throw new IllegalArgumentException(BadSize); |
680 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
681 |
|
return StreamSupport.longStream |
682 |
|
(new RandomLongsSpliterator |
683 |
|
(this, 0L, streamSize, Long.MAX_VALUE, 0L), |
718 |
|
public LongStream longs(long streamSize, long randomNumberOrigin, |
719 |
|
long randomNumberBound) { |
720 |
|
if (streamSize < 0L) |
721 |
< |
throw new IllegalArgumentException(BadSize); |
721 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
722 |
|
if (randomNumberOrigin >= randomNumberBound) |
723 |
< |
throw new IllegalArgumentException(BadRange); |
723 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
724 |
|
return StreamSupport.longStream |
725 |
|
(new RandomLongsSpliterator |
726 |
|
(this, 0L, streamSize, randomNumberOrigin, randomNumberBound), |
744 |
|
*/ |
745 |
|
public LongStream longs(long randomNumberOrigin, long randomNumberBound) { |
746 |
|
if (randomNumberOrigin >= randomNumberBound) |
747 |
< |
throw new IllegalArgumentException(BadRange); |
747 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
748 |
|
return StreamSupport.longStream |
749 |
|
(new RandomLongsSpliterator |
750 |
|
(this, 0L, Long.MAX_VALUE, randomNumberOrigin, randomNumberBound), |
763 |
|
*/ |
764 |
|
public DoubleStream doubles(long streamSize) { |
765 |
|
if (streamSize < 0L) |
766 |
< |
throw new IllegalArgumentException(BadSize); |
766 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
767 |
|
return StreamSupport.doubleStream |
768 |
|
(new RandomDoublesSpliterator |
769 |
|
(this, 0L, streamSize, Double.MAX_VALUE, 0.0), |
799 |
|
* @return a stream of pseudorandom {@code double} values, |
800 |
|
* each with the given origin (inclusive) and bound (exclusive) |
801 |
|
* @throws IllegalArgumentException if {@code streamSize} is |
802 |
< |
* less than zero |
781 |
< |
* @throws IllegalArgumentException if {@code randomNumberOrigin} |
802 |
> |
* less than zero, or {@code randomNumberOrigin} |
803 |
|
* is greater than or equal to {@code randomNumberBound} |
804 |
|
*/ |
805 |
|
public DoubleStream doubles(long streamSize, double randomNumberOrigin, |
806 |
|
double randomNumberBound) { |
807 |
|
if (streamSize < 0L) |
808 |
< |
throw new IllegalArgumentException(BadSize); |
808 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
809 |
|
if (!(randomNumberOrigin < randomNumberBound)) |
810 |
< |
throw new IllegalArgumentException(BadRange); |
810 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
811 |
|
return StreamSupport.doubleStream |
812 |
|
(new RandomDoublesSpliterator |
813 |
|
(this, 0L, streamSize, randomNumberOrigin, randomNumberBound), |
831 |
|
*/ |
832 |
|
public DoubleStream doubles(double randomNumberOrigin, double randomNumberBound) { |
833 |
|
if (!(randomNumberOrigin < randomNumberBound)) |
834 |
< |
throw new IllegalArgumentException(BadRange); |
834 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
835 |
|
return StreamSupport.doubleStream |
836 |
|
(new RandomDoublesSpliterator |
837 |
|
(this, 0L, Long.MAX_VALUE, randomNumberOrigin, randomNumberBound), |
846 |
|
* approach. The long and double versions of this class are |
847 |
|
* identical except for types. |
848 |
|
*/ |
849 |
< |
static final class RandomIntsSpliterator implements Spliterator.OfInt { |
849 |
> |
private static final class RandomIntsSpliterator |
850 |
> |
implements Spliterator.OfInt { |
851 |
|
final SplittableRandom rng; |
852 |
|
long index; |
853 |
|
final long fence; |
902 |
|
/** |
903 |
|
* Spliterator for long streams. |
904 |
|
*/ |
905 |
< |
static final class RandomLongsSpliterator implements Spliterator.OfLong { |
905 |
> |
private static final class RandomLongsSpliterator |
906 |
> |
implements Spliterator.OfLong { |
907 |
|
final SplittableRandom rng; |
908 |
|
long index; |
909 |
|
final long fence; |
959 |
|
/** |
960 |
|
* Spliterator for double streams. |
961 |
|
*/ |
962 |
< |
static final class RandomDoublesSpliterator implements Spliterator.OfDouble { |
962 |
> |
private static final class RandomDoublesSpliterator |
963 |
> |
implements Spliterator.OfDouble { |
964 |
|
final SplittableRandom rng; |
965 |
|
long index; |
966 |
|
final long fence; |