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 |
418 |
|
*/ |
419 |
|
public int nextInt(int bound) { |
420 |
|
if (bound <= 0) |
421 |
< |
throw new IllegalArgumentException(BadBound); |
421 |
> |
throw new IllegalArgumentException(BAD_BOUND); |
422 |
|
// Specialize internalNextInt for origin 0 |
423 |
|
int r = mix32(nextSeed()); |
424 |
|
int m = bound - 1; |
446 |
|
*/ |
447 |
|
public int nextInt(int origin, int bound) { |
448 |
|
if (origin >= bound) |
449 |
< |
throw new IllegalArgumentException(BadRange); |
449 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
450 |
|
return internalNextInt(origin, bound); |
451 |
|
} |
452 |
|
|
470 |
|
*/ |
471 |
|
public long nextLong(long bound) { |
472 |
|
if (bound <= 0) |
473 |
< |
throw new IllegalArgumentException(BadBound); |
473 |
> |
throw new IllegalArgumentException(BAD_BOUND); |
474 |
|
// Specialize internalNextLong for origin 0 |
475 |
|
long r = mix64(nextSeed()); |
476 |
|
long m = bound - 1; |
498 |
|
*/ |
499 |
|
public long nextLong(long origin, long bound) { |
500 |
|
if (origin >= bound) |
501 |
< |
throw new IllegalArgumentException(BadRange); |
501 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
502 |
|
return internalNextLong(origin, bound); |
503 |
|
} |
504 |
|
|
524 |
|
*/ |
525 |
|
public double nextDouble(double bound) { |
526 |
|
if (!(bound > 0.0)) |
527 |
< |
throw new IllegalArgumentException(BadBound); |
527 |
> |
throw new IllegalArgumentException(BAD_BOUND); |
528 |
|
double result = (mix64(nextSeed()) >>> 11) * DOUBLE_UNIT * bound; |
529 |
|
return (result < bound) ? result : // correct for rounding |
530 |
|
Double.longBitsToDouble(Double.doubleToLongBits(bound) - 1); |
531 |
|
} |
532 |
|
|
533 |
|
/** |
534 |
+ |
* Generates a pseudorandom number with the indicated number of |
535 |
+ |
* low-order bits. Because this class has no subclasses, this |
536 |
+ |
* method cannot be invoked or overridden. |
537 |
+ |
* |
538 |
+ |
* @param bits random bits |
539 |
+ |
* @return the next pseudorandom value from this random number |
540 |
+ |
* generator's sequence |
541 |
+ |
*/ |
542 |
+ |
protected int next(int bits) { |
543 |
+ |
return nextInt() >>> (32 - bits); |
544 |
+ |
} |
545 |
+ |
|
546 |
+ |
/** |
547 |
|
* Returns a pseudorandom {@code double} value between the specified |
548 |
|
* origin (inclusive) and bound (exclusive). |
549 |
|
* |
556 |
|
*/ |
557 |
|
public double nextDouble(double origin, double bound) { |
558 |
|
if (!(origin < bound)) |
559 |
< |
throw new IllegalArgumentException(BadRange); |
559 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
560 |
|
return internalNextDouble(origin, bound); |
561 |
|
} |
562 |
|
|
584 |
|
*/ |
585 |
|
public IntStream ints(long streamSize) { |
586 |
|
if (streamSize < 0L) |
587 |
< |
throw new IllegalArgumentException(BadSize); |
587 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
588 |
|
return StreamSupport.intStream |
589 |
|
(new RandomIntsSpliterator |
590 |
|
(this, 0L, streamSize, Integer.MAX_VALUE, 0), |
625 |
|
public IntStream ints(long streamSize, int randomNumberOrigin, |
626 |
|
int randomNumberBound) { |
627 |
|
if (streamSize < 0L) |
628 |
< |
throw new IllegalArgumentException(BadSize); |
628 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
629 |
|
if (randomNumberOrigin >= randomNumberBound) |
630 |
< |
throw new IllegalArgumentException(BadRange); |
630 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
631 |
|
return StreamSupport.intStream |
632 |
|
(new RandomIntsSpliterator |
633 |
|
(this, 0L, streamSize, randomNumberOrigin, randomNumberBound), |
651 |
|
*/ |
652 |
|
public IntStream ints(int randomNumberOrigin, int randomNumberBound) { |
653 |
|
if (randomNumberOrigin >= randomNumberBound) |
654 |
< |
throw new IllegalArgumentException(BadRange); |
654 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
655 |
|
return StreamSupport.intStream |
656 |
|
(new RandomIntsSpliterator |
657 |
|
(this, 0L, Long.MAX_VALUE, randomNumberOrigin, randomNumberBound), |
670 |
|
*/ |
671 |
|
public LongStream longs(long streamSize) { |
672 |
|
if (streamSize < 0L) |
673 |
< |
throw new IllegalArgumentException(BadSize); |
673 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
674 |
|
return StreamSupport.longStream |
675 |
|
(new RandomLongsSpliterator |
676 |
|
(this, 0L, streamSize, Long.MAX_VALUE, 0L), |
711 |
|
public LongStream longs(long streamSize, long randomNumberOrigin, |
712 |
|
long randomNumberBound) { |
713 |
|
if (streamSize < 0L) |
714 |
< |
throw new IllegalArgumentException(BadSize); |
714 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
715 |
|
if (randomNumberOrigin >= randomNumberBound) |
716 |
< |
throw new IllegalArgumentException(BadRange); |
716 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
717 |
|
return StreamSupport.longStream |
718 |
|
(new RandomLongsSpliterator |
719 |
|
(this, 0L, streamSize, randomNumberOrigin, randomNumberBound), |
737 |
|
*/ |
738 |
|
public LongStream longs(long randomNumberOrigin, long randomNumberBound) { |
739 |
|
if (randomNumberOrigin >= randomNumberBound) |
740 |
< |
throw new IllegalArgumentException(BadRange); |
740 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
741 |
|
return StreamSupport.longStream |
742 |
|
(new RandomLongsSpliterator |
743 |
|
(this, 0L, Long.MAX_VALUE, randomNumberOrigin, randomNumberBound), |
756 |
|
*/ |
757 |
|
public DoubleStream doubles(long streamSize) { |
758 |
|
if (streamSize < 0L) |
759 |
< |
throw new IllegalArgumentException(BadSize); |
759 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
760 |
|
return StreamSupport.doubleStream |
761 |
|
(new RandomDoublesSpliterator |
762 |
|
(this, 0L, streamSize, Double.MAX_VALUE, 0.0), |
799 |
|
public DoubleStream doubles(long streamSize, double randomNumberOrigin, |
800 |
|
double randomNumberBound) { |
801 |
|
if (streamSize < 0L) |
802 |
< |
throw new IllegalArgumentException(BadSize); |
802 |
> |
throw new IllegalArgumentException(BAD_SIZE); |
803 |
|
if (!(randomNumberOrigin < randomNumberBound)) |
804 |
< |
throw new IllegalArgumentException(BadRange); |
804 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
805 |
|
return StreamSupport.doubleStream |
806 |
|
(new RandomDoublesSpliterator |
807 |
|
(this, 0L, streamSize, randomNumberOrigin, randomNumberBound), |
825 |
|
*/ |
826 |
|
public DoubleStream doubles(double randomNumberOrigin, double randomNumberBound) { |
827 |
|
if (!(randomNumberOrigin < randomNumberBound)) |
828 |
< |
throw new IllegalArgumentException(BadRange); |
828 |
> |
throw new IllegalArgumentException(BAD_RANGE); |
829 |
|
return StreamSupport.doubleStream |
830 |
|
(new RandomDoublesSpliterator |
831 |
|
(this, 0L, Long.MAX_VALUE, randomNumberOrigin, randomNumberBound), |
840 |
|
* approach. The long and double versions of this class are |
841 |
|
* identical except for types. |
842 |
|
*/ |
843 |
< |
static final class RandomIntsSpliterator implements Spliterator.OfInt { |
843 |
> |
private static final class RandomIntsSpliterator |
844 |
> |
implements Spliterator.OfInt { |
845 |
|
final SplittableRandom rng; |
846 |
|
long index; |
847 |
|
final long fence; |
896 |
|
/** |
897 |
|
* Spliterator for long streams. |
898 |
|
*/ |
899 |
< |
static final class RandomLongsSpliterator implements Spliterator.OfLong { |
899 |
> |
private static final class RandomLongsSpliterator |
900 |
> |
implements Spliterator.OfLong { |
901 |
|
final SplittableRandom rng; |
902 |
|
long index; |
903 |
|
final long fence; |
953 |
|
/** |
954 |
|
* Spliterator for double streams. |
955 |
|
*/ |
956 |
< |
static final class RandomDoublesSpliterator implements Spliterator.OfDouble { |
956 |
> |
private static final class RandomDoublesSpliterator |
957 |
> |
implements Spliterator.OfDouble { |
958 |
|
final SplittableRandom rng; |
959 |
|
long index; |
960 |
|
final long fence; |