private static int mixSeedAndState()

in commons-rng-core/src/main/java/org/apache/commons/rng/core/source32/MersenneTwister.java [205:227]

• 21 lines of code
• 6 McCabe index (conditional complexity)

    private static int mixSeedAndState(int[] state, final int[] seed) {
        final int stateSize = state.length;

        int i = 1;
        int j = 0;

        for (int k = Math.max(stateSize, seed.length); k > 0; k--) {
            final long a = (state[i] & LOWER_MASK_LONG) | ((state[i] < 0) ? UPPER_MASK_LONG : 0);
            final long b = (state[i - 1] & LOWER_MASK_LONG) | ((state[i - 1] < 0) ? UPPER_MASK_LONG : 0);
            final long c = (a ^ ((b ^ (b >> 30)) * 1664525L)) + seed[j] + j; // Non linear.
            state[i] = (int) (c & INT_MASK_LONG);
            i++;
            j++;
            if (i >= stateSize) {
                state[0] = state[stateSize - 1];
                i = 1;
            }
            if (j >= seed.length) {
                j = 0;
            }
        }
        return i;
    }