package com.demo.lib.common.util.common;

/**
 * Object Utils
 * 
 * @author LCJIAN
 */
public class ObjectUtils {

    /**
     * compare two object
     * 
     * @param actual
     * @param expected
     * @return <ul>
     *         <li>if both are null, return true</li>
     *         <li>return actual.{@link Object#equals(Object)}</li>
     *         </ul>
     */
    public static boolean isEquals(Object actual, Object expected) {
        return actual == expected || (actual == null ? expected == null : actual.equals(expected));
    }

    /**
     * compare two object
     * <ul>
     * <strong>About result</strong>
     * <li>if v1 > v2, return 1</li>
     * <li>if v1 = v2, return 0</li>
     * <li>if v1 < v2, return -1</li>
     * </ul>
     * <ul>
     * <strong>About rule</strong>
     * <li>if v1 is null, v2 is null, then return 0</li>
     * <li>if v1 is null, v2 is not null, then return -1</li>
     * <li>if v1 is not null, v2 is null, then return 1</li>
     * <li>return v1.{@link Comparable#compareTo(Object)}</li>
     * </ul>
     * 
     * @param v1
     * @param v2
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static <V> int compare(V v1, V v2) {
        return v1 == null ? (v2 == null ? 0 : -1) : (v2 == null ? 1 : ((Comparable) v1).compareTo(v2));
    }
}