MostAbstractFirst.java

package gov.nasa.jpl.mbee.mdk.util;

import java.util.Comparator;

@Deprecated
public class MostAbstractFirst implements Comparator<Class<?>> {

    public static MostAbstractFirst instance = instance();

    public static MostAbstractFirst instance() {
        if (instance == null) {
            instance = new MostAbstractFirst();
        }
        return instance;
    }

    /**
     *
     */
    public MostAbstractFirst() {
    }

    @Override
    public int compare(Class<?> o1, Class<?> o2) {
        if (o1 == o2) {
            return 0;
        }
        if (o1 == null) {
            return -1;
        }
        if (o2 == null) {
            return 1;
        }
        int count1 = 0, count2 = 0;
        Class<?> p1 = o1, p2 = o2;
        while (p1 != null) {
            ++count1;
            p1 = p1.getSuperclass();
        }
        while (p2 != null) {
            ++count2;
            if (count2 > count1) {
                return -1;
            }
            p1 = p1.getSuperclass();
        }
        if (count1 > count2) {
            return 1;
        }
        // tie break with generic comparator
        return CompareUtils.GenericComparator.instance().compare(o1, o2);
    }

}