How to use

newBignum

method

in

org.jruby.RubyBignum

public static long num2ulong(Ruby runtime, IRubyObject value) {
  if (value instanceof RubyFloat) {
    RubyBignum bignum = RubyBignum.newBignum(runtime, ((RubyFloat) value).getDoubleValue());
    return RubyBignum.big2ulong(bignum);
  } else if (value instanceof RubyBignum) {
    return RubyBignum.big2ulong((RubyBignum) value);
  } else {
    return RubyNumeric.num2long(value);
  }
}

  long ret = (Long) value;
  return ret >= 0 ? runtime.newFixnum(ret) :
      RubyBignum.newBignum(runtime, UINT64_COMPLEMENTARY.add(new BigInteger(ret + "")));
case FLOAT:
  return runtime.newFloat((Float) value);

/** rb_big_abs
 *
 */
@Override
public IRubyObject abs(ThreadContext context) {
  return RubyBignum.newBignum(context.runtime, value.abs());
}

public static IRubyObject newUnsigned64(Ruby runtime, long value) {
  return value < 0
      ? RubyBignum.newBignum(runtime, BigInteger.valueOf(value & 0x7fffffffffffffffL).add(UINT64_BASE))
      : RubyFixnum.newFixnum(runtime, value);
}

/** rb_big_norm
 *
 */
public static RubyInteger bignorm(Ruby runtime, BigInteger bi) {
  return (bi.compareTo(LONG_MIN) < 0 || bi.compareTo(LONG_MAX) > 0) ?
        newBignum(runtime, bi) : runtime.newFixnum(bi.longValue());
}

private static RubyInteger toInteger(final Ruby runtime, final BigDecimal result) {
  if (result.compareTo(MAX_FIX) <= 0 && result.compareTo(MIN_FIX) >= 0) {
    return RubyFixnum.newFixnum(runtime, result.longValue());
  }
  return RubyBignum.newBignum(runtime, result.toBigInteger());
}

private static RubyInteger toRubyInteger(final Ruby runtime, final Number i) {
  if (i instanceof BigInteger) {
    return RubyBignum.newBignum(runtime, (BigInteger) i);
  }
  return RubyFixnum.newFixnum(runtime, i.longValue());
}

public IRubyObject convert(Ruby runtime, Object object) {
  if (object == null) return runtime.getNil();
  return RubyBignum.newBignum(runtime, (BigInteger)object);
}
public IRubyObject get(Ruby runtime, Object array, int i) {

private static RubyInteger negate(final Ruby runtime, final long value) {
  if (value == MIN) { // a gotcha
    return RubyBignum.newBignum(runtime, BigInteger.valueOf(value).negate());
  }
  return RubyFixnum.newFixnum(runtime, -value);
}

public static IRubyObject newUnsigned64(Ruby runtime, long value) {
  return value < 0
      ? RubyBignum.newBignum(runtime, BigInteger.valueOf(value & 0x7fffffffffffffffL).add(UINT64_BASE))
      : RubyFixnum.newFixnum(runtime, value);
}

private static RubyInteger negate(final Ruby runtime, final long value) {
  if (value == MIN) { // a gotcha
    return RubyBignum.newBignum(runtime, BigInteger.valueOf(value).negate());
  }
  return RubyFixnum.newFixnum(runtime, -value);
}

public static IRubyObject newUnsigned64(ThreadContext context, long value) {
  return value < 0
      ? RubyBignum.newBignum(context.runtime, BigInteger.valueOf(value & 0x7fffffffffffffffL).add(UINT64_BASE))
      : RubyFixnum.newFixnum(context.runtime, value);
}

private static RubyBignum randomBignum(final ThreadContext context, final Number lower, final BigInteger upperExc) {
  BigInteger lowerBig = lower instanceof BigInteger ? (BigInteger) lower : BigInteger.valueOf(lower.longValue());
  BigInteger bound = upperExc.subtract(lowerBig);
  BigInteger rnd = nextBigInteger(getSecureRandom(context), bound, bound.bitLength());
  return RubyBignum.newBignum(context.runtime, rnd.add(lowerBig));
}

@JRubyMethod
public IRubyObject ceil(ThreadContext context) {
  checkFloatDomain();
  BigInteger ceil = value.setScale(0, RoundingMode.CEILING).toBigInteger();
  if (ceil.compareTo(BigInteger.valueOf((long) ceil.intValue())) == 0) { // It fits in Fixnum
    return RubyInteger.int2fix(context.runtime, ceil.intValue());
  }
  return RubyBignum.newBignum(context.runtime, ceil);
}

@JRubyMethod(name = "to_r")
public IRubyObject to_r(ThreadContext context) {
  checkFloatDomain();
  int scale = value.scale();
  BigInteger numerator = value.scaleByPowerOfTen(scale).toBigInteger();
  BigInteger denominator = BigInteger.TEN.pow(scale);
  return RubyRational.newInstance(context, RubyBignum.newBignum(context.runtime, numerator), RubyBignum.newBignum(context.runtime, denominator));
}

@Override
public IRubyObject op_mul(ThreadContext context, long otherValue) {
  Ruby runtime = context.runtime;
  try {
    return newFixnum(runtime, Math.multiplyExact(value, otherValue));
  } catch (ArithmeticException ae) {
    return RubyBignum.newBignum(runtime, value).op_mul(context, otherValue);
  }
}

/** rb_big_neg
 *
 */
@JRubyMethod(name = "~")
public IRubyObject op_neg() {
  return RubyBignum.newBignum(getRuntime(), value.not());
}

private IRubyObject subtractOther(ThreadContext context, IRubyObject other) {
  if (other instanceof RubyBignum) {
    return RubyBignum.newBignum(context.runtime, value).op_minus(context, ((RubyBignum) other).value);
  }
  if (other instanceof RubyFloat) {
    return context.runtime.newFloat((double) value - ((RubyFloat) other).getDoubleValue());
  }
  return coerceBin(context, sites(context).op_minus, other);
}

public static RubyInteger f_gcd(ThreadContext context, RubyInteger x, RubyInteger y) {
  if (x instanceof RubyFixnum && y instanceof RubyFixnum && isLongMinValue((RubyFixnum) x))
    return RubyFixnum.newFixnum(context.runtime, i_gcd(x.getLongValue(), y.getLongValue()));
  BigInteger gcd = x.getBigIntegerValue().gcd(y.getBigIntegerValue());
  if (gcd.compareTo(RubyBignum.LONG_MAX) <= 0) { // gcd always positive
    return RubyFixnum.newFixnum(context.runtime, gcd.longValue());
  }
  return RubyBignum.newBignum(context.runtime, gcd);
}

private IRubyObject lshift(long width) {
  if (width > BIT_SIZE - 1 || ((~0L << BIT_SIZE - width - 1) & value) != 0) {
    return RubyBignum.newBignum(getRuntime(), value).op_lshift(RubyFixnum.newFixnum(getRuntime(), width));
  }
  return RubyFixnum.newFixnum(getRuntime(), value << width);
}