MmapUtils.java

package com.github.eddyzhou.mcache;

public class MmapUtils {
    private MmapUtils() {
    }

    public static int getlargerPrime(int n) {
        if (n >= 1610612741) {
            throw new IllegalArgumentException("n must < 1610612741");
        }
        int[] prime = { 53, 97, 193, 389, 769, 1543, 3079, 6151, 12289, 24593,
                49157, 98317, 196613, 393241, 786433, 1572869, 3145739,
                6291469, 12582917, 25165843, 50331653, 100663319, 201326611,
                402653189, 805306457, 1610612741 };
        // n=8, prime=53
        for (int i = 0; i < prime.length; i++) {
            if (prime[i] > n)
                return prime[i];
        }
        return 0;
    }
}