ComparisonUtils.java

package com.simplecity.amp_library.utils;

import android.support.annotation.Nullable;

import java.text.Collator;
import java.util.Locale;

public class ComparisonUtils {

    private static Collator collator = Collator.getInstance(Locale.getDefault());

    private ComparisonUtils() {

    }

    public static int compareLong(long x, long y) {
        return (x < y) ? -1 : ((x == y) ? 0 : 1);
    }

    public static int compareInt(int x, int y) {
        return (x < y) ? -1 : ((x == y) ? 0 : 1);
    }

    /**
     * Null-safe string comparison. Uses a Collator, which is slower than normal string comparison.
     */
    public static int compare(@Nullable String str1, @Nullable String str2) {

        if (str1 == null) {
            return -1;
        } else if (str2 == null) {
            return 1;
        } else if (str1.equals(str2)) {
            return 0;
        } else {
            return collator.compare(str1, str2);
        }
    }
}