Examples with RubyBignum org.jruby.RubyBignum used on opensource projects

Example 1 with RubyBignum

use of org.jruby.RubyBignum in project jruby-openssl by jruby.

the class BN method exp.

@JRubyMethod(name = "**")
public BN exp(final ThreadContext context, IRubyObject other) {
    // somewhat strangely, BigInteger takes int rather than BigInteger
    // as the argument to pow.  so we'll have to narrow the value, and
    // raise an exception if data would be lost. (on the other hand, an
    // exponent even approaching Integer.MAX_VALUE would be silly big, and
    // the value would take a very, very long time to calculate.)
    // we'll check for values < 0 (illegal) while we're at it
    int exp = -1;
    if (other instanceof RubyInteger) {
        long val = ((RubyInteger) other).getLongValue();
        if (val >= 0 && val <= Integer.MAX_VALUE) {
            exp = (int) val;
        } else if (other instanceof RubyBignum) {
            // inherently too big
            throw newBNError(context.runtime, "invalid exponent");
        }
    }
    if (exp == -1) {
        if (!(other instanceof BN)) {
            throw context.runtime.newTypeError("Cannot convert into " + other.getMetaClass().getName());
        }
        BigInteger val = ((BN) other).value;
        if (val.compareTo(BigInteger.ZERO) < 0 || val.compareTo(MAX_INT) > 0) {
            throw newBNError(context.runtime, "invalid exponent");
        }
        exp = val.intValue();
    }
    try {
        return newBN(context.runtime, value.pow(exp));
    } catch (ArithmeticException e) {
        // shouldn't happen, we've already checked for < 0
        throw newBNError(context.runtime, "invalid exponent");
    }
}