[jalviewjs.git] / site / swingjs / j2s / java / util / Random.js

Clazz.load(null,"java.util.Random",["java.lang.IllegalArgumentException"],function(){
c$=Clazz.decorateAsClass(function(){
this.haveNextNextGaussian=false;
this.seed=0;
this.nextNextGaussian=0;
Clazz.instantialize(this,arguments);
},java.util,"Random",null,java.io.Serializable);
Clazz.makeConstructor(c$,
function(){
this.setSeed(System.currentTimeMillis());
});
Clazz.makeConstructor(c$,
function(seed){
this.setSeed(seed);
},"~N");
Clazz.defineMethod(c$,"next",
function(bits){
this.seed=(this.seed*25214903917+0xb)&(281474976710655);
return(this.seed>>>(48-bits));
},"~N");
Clazz.defineMethod(c$,"nextBoolean",
function(){
return Math.random()>0.5;
});
Clazz.defineMethod(c$,"nextBytes",
function(buf){
for(var i=0;i<bytes.length;i++){
bytes[i]=Math.round(0x100*Math.random());
}
},"~A");
Clazz.defineMethod(c$,"nextDouble",
function(){
return Math.random();
});
Clazz.defineMethod(c$,"nextFloat",
function(){
return Math.random();
});
Clazz.defineMethod(c$,"nextGaussian",
function(){
if(this.haveNextNextGaussian){
this.haveNextNextGaussian=false;
return this.nextNextGaussian;
}var v1;
var v2;
var s;
do{
v1=2*this.nextDouble()-1;
v2=2*this.nextDouble()-1;
s=v1*v1+v2*v2;
}while(s>=1);
var norm=Math.sqrt(-2*Math.log(s)/s);
this.nextNextGaussian=v2*norm;
this.haveNextNextGaussian=true;
return v1*norm;
});
Clazz.defineMethod(c$,"nextInt",
function(){
return Math.ceil(0xffff*Math.random())-0x8000;
});
Clazz.defineMethod(c$,"nextInt",
function(n){
if(n>0){
n = Math.min(n, 31);
return Math.floor((2 << (n - 1)) * Math.random())

/*
if((n&-n)==n){
return((n*this.next(31))>>31);
}var bits;
var val;
do{
bits=this.next(31);
val=bits%n;
}while(bits-val+(n-1)<0);


return val;

*/
}
throw new IllegalArgumentException();
},"~N");
Clazz.defineMethod(c$,"nextLong",
function(){
return Math.ceil(0xffffffff*Math.random())-0x80000000;
});
Clazz.defineMethod(c$,"setSeed",
function(seed){
Math.seedrandom(seed);
//this.seed=(seed^25214903917)&(281474976710655);
//this.haveNextNextGaussian=false;
},"~N");
Clazz.defineStatics(c$,
"multiplier",0x5deece66d);
});

// seedrandom.js
// Author: David Bau 3/11/2010
//
// Defines a method Math.seedrandom() that, when called, substitutes
// an explicitly seeded RC4-based algorithm for Math.random().  Also
// supports automatic seeding from local or network sources of entropy.
//
// Usage:
//
//   <script src=http://davidbau.com/encode/seedrandom-min.js></script>
//
//   Math.seedrandom('yipee'); Sets Math.random to a function that is
//                             initialized using the given explicit seed.
//
//   Math.seedrandom();        Sets Math.random to a function that is
//                             seeded using the current time, dom state,
//                             and other accumulated local entropy.
//                             The generated seed string is returned.
//
//   Math.seedrandom('yowza', true);
//                             Seeds using the given explicit seed mixed
//                             together with accumulated entropy.
//
//   <script src="http://bit.ly/srandom-512"></script>
//                             Seeds using physical random bits downloaded
//                             from random.org.
//
// Examples:
//
//   Math.seedrandom("hello");            // Use "hello" as the seed.
//   document.write(Math.random());       // Always 0.5463663768140734
//   document.write(Math.random());       // Always 0.43973793770592234
//   var rng1 = Math.random;              // Remember the current prng.
//
//   var autoseed = Math.seedrandom();    // New prng with an automatic seed.
//   document.write(Math.random());       // Pretty much unpredictable.
//
//   Math.random = rng1;                  // Continue "hello" prng sequence.
//   document.write(Math.random());       // Always 0.554769432473455
//
//   Math.seedrandom(autoseed);           // Restart at the previous seed.
//   document.write(Math.random());       // Repeat the 'unpredictable' value.
//
// Notes:
//
// Each time seedrandom('arg') is called, entropy from the passed seed
// is accumulated in a pool to help generate future seeds for the
// zero-argument form of Math.seedrandom, so entropy can be injected over
// time by calling seedrandom with explicit data repeatedly.
//
// On speed - This javascript implementation of Math.random() is about
// 3-10x slower than the built-in Math.random() because it is not native
// code, but this is typically fast enough anyway.  Seeding is more expensive,
// especially if you use auto-seeding.  Some details (timings on Chrome 4):
//
// Our Math.random()            - avg less than 0.002 milliseconds per call
// seedrandom('explicit')       - avg less than 0.5 milliseconds per call
// seedrandom('explicit', true) - avg less than 2 milliseconds per call
// seedrandom()                 - avg about 38 milliseconds per call
//
// LICENSE (BSD):
//
// Copyright 2010 David Bau, all rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   1. Redistributions of source code must retain the above copyright
//      notice, this list of conditions and the following disclaimer.
//
//   2. Redistributions in binary form must reproduce the above copyright
//      notice, this list of conditions and the following disclaimer in the
//      documentation and/or other materials provided with the distribution.
//
//   3. Neither the name of this module nor the names of its contributors may
//      be used to endorse or promote products derived from this software
//      without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
/**
 * All code is in an anonymous closure to keep the global namespace clean.
 *
 * @param {number=} overflow
 * @param {number=} startdenom
 */
(function (pool, math, width, chunks, significance, overflow, startdenom) {

var copyright = "Copyright 2010 David Bau, all rights reserved. (BSD)"
//
// seedrandom()
// This is the seedrandom function described above.
//
math['seedrandom'] = function seedrandom(seed, use_entropy) {
  var key = [];
  var arc4;

  // Flatten the seed string or build one from local entropy if needed.
  seed = mixkey(flatten(
    use_entropy ? [seed, pool] :
    arguments.length ? seed :
    [new Date().getTime(), pool, window], 3), key);

  // Use the seed to initialize an ARC4 generator.
  arc4 = new ARC4(key);

  // Mix the randomness into accumulated entropy.
  mixkey(arc4.S, pool);

  // Override Math.random

  // This function returns a random double in [0, 1) that contains
  // randomness in every bit of the mantissa of the IEEE 754 value.

  math['random'] = function random() {  // Closure to return a random double:
    var n = arc4.g(chunks);             // Start with a numerator n < 2 ^ 48
    var d = startdenom;                 //   and denominator d = 2 ^ 48.
    var x = 0;                          //   and no 'extra last byte'.
    while (n < significance) {          // Fill up all significant digits by
      n = (n + x) * width;              //   shifting numerator and
      d *= width;                       //   denominator and generating a
      x = arc4.g(1);                    //   new least-significant-byte.
    }
    while (n >= overflow) {             // To avoid rounding up, before adding
      n /= 2;                           //   last byte, shift everything
      d /= 2;                           //   right using integer math until
      x >>>= 1;                         //   we have exactly the desired bits.
    }
    return (n + x) / d;                 // Form the number within [0, 1).
  };

  // Return the seed that was used
  return seed;
};

//
// ARC4
//
// An ARC4 implementation.  The constructor takes a key in the form of
// an array of at most (width) integers that should be 0 <= x < (width).
//
// The g(count) method returns a pseudorandom integer that concatenates
// the next (count) outputs from ARC4.  Its return value is a number x
// that is in the range 0 <= x < (width ^ count).
//
/** @constructor */
function ARC4(key) {
  var t, u, me = this, keylen = key.length;
  var i = 0, j = me.i = me.j = me.m = 0;
  me.S = [];
  me.c = [];

  // The empty key [] is treated as [0].
  if (!keylen) { key = [keylen++]; }

  // Set up S using the standard key scheduling algorithm.
  while (i < width) { me.S[i] = i++; }
  for (i = 0; i < width; i++) {
    t = me.S[i];
    j = lowbits(j + t + key[i % keylen]);
    u = me.S[j];
    me.S[i] = u;
    me.S[j] = t;
  }

  // The "g" method returns the next (count) outputs as one number.
  me.g = function getnext(count) {
    var s = me.S;
    var i = lowbits(me.i + 1); var t = s[i];
    var j = lowbits(me.j + t); var u = s[j];
    s[i] = u;
    s[j] = t;
    var r = s[lowbits(t + u)];
    while (--count) {
      i = lowbits(i + 1); t = s[i];
      j = lowbits(j + t); u = s[j];
      s[i] = u;
      s[j] = t;
      r = r * width + s[lowbits(t + u)];
    }
    me.i = i;
    me.j = j;
    return r;
  };
  // For robust unpredictability discard an initial batch of values.
  // See http://www.rsa.com/rsalabs/node.asp?id=2009
  me.g(width);
}

//
// flatten()
// Converts an object tree to nested arrays of strings.
//
/** @param {Object=} result
  * @param {string=} prop */
function flatten(obj, depth, result, prop) {
  result = [];
  if (depth && typeof(obj) == 'object') {
    for (prop in obj) {
      if (prop.indexOf('S') < 5) {    // Avoid FF3 bug (local/sessionStorage)
        try { result.push(flatten(obj[prop], depth - 1)); } catch (e) {}
      }
    }
  }
  return result.length ? result : '' + obj;
}

//
// mixkey()
// Mixes a string seed into a key that is an array of integers, and
// returns a shortened string seed that is equivalent to the result key.
//
/** @param {number=} smear
  * @param {number=} j */
function mixkey(seed, key, smear, j) {
  seed += '';                         // Ensure the seed is a string
  smear = 0;
  for (j = 0; j < seed.length; j++) {
    key[lowbits(j)] =
      lowbits((smear ^= key[lowbits(j)] * 19) + seed.charCodeAt(j));
  }
  seed = '';
  for (j in key) { seed += String.fromCharCode(key[j]); }
  return seed;
}

//
// lowbits()
// A quick "n mod width" for width a power of 2.
//
function lowbits(n) { return n & (width - 1); }

//
// The following constants are related to IEEE 754 limits.
//
startdenom = math.pow(width, chunks);
significance = math.pow(2, significance);
overflow = significance * 2;

//
// When seedrandom.js is loaded, we immediately mix a few bits
// from the built-in RNG into the entropy pool.  Because we do
// not want to intefere with determinstic PRNG state later,
// seedrandom will not call math.random on its own again after
// initialization.
//
mixkey(math.random(), pool);

// End anonymous scope, and pass initial values.
})(
  [],   // pool: entropy pool starts empty
  Math, // math: package containing random, pow, and seedrandom
  256,  // width: each RC4 output is 0 <= x < 256
  6,    // chunks: at least six RC4 outputs for each double
  52    // significance: there are 52 significant digits in a double
);