private static int compareStrings(String s1, String s2) {
        if (s1 == null && s2 == null) {
            return 0;
        }

        if (s1 == null /* && s2 != null */) {
            return -1;
        }

        if (
        /* s1 != null && */ s2 == null) {
            return 1;
        }

        return s1.compareTo(s2);
    }

import org.apache.maven.model.Plugin;

/**
 */
class CacheUtils {

    /**
     * @deprecated Use {@link Objects#equals(Object)}
     */
    @Deprecated
    public static <T> boolean eq(T s1, T s2) {
        return Objects.equals(s1, s2);
    }

    /**
     * @deprecated Use {@link Objects#hashCode(Object)}
     */
    @Deprecated
    public static int hash(Object obj) {
        return obj != null ? obj.hashCode() : 0;