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 BAD_BOUND = "bound must be positive"; |
244 |
– |
static final String BAD_RANGE = "bound must be greater than origin"; |
245 |
– |
static final String BAD_SIZE = "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 |
531 |
|
} |
532 |
|
|
533 |
|
/** |
534 |
+ |
* Generates a pseudorandom number with the indicated number of |
535 |
+ |
* bits. Unlike in superclass @{link Random}, this method is never |
536 |
+ |
* internally called or used by any other publicly accessible |
537 |
+ |
* method. |
538 |
+ |
* |
539 |
+ |
* @param bits random bits |
540 |
+ |
* @return the next pseudorandom value from this random number |
541 |
+ |
* generator's sequence |
542 |
+ |
*/ |
543 |
+ |
protected int next(int bits) { |
544 |
+ |
return (int)(nextLong() >>> (64 - bits)); |
545 |
+ |
} |
546 |
+ |
|
547 |
+ |
/** |
548 |
|
* Returns a pseudorandom {@code double} value between the specified |
549 |
|
* origin (inclusive) and bound (exclusive). |
550 |
|
* |