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package com.centit.support.common;

/**
 * key value 数值对; 我们经常想在一个方法中返回多个值,比如返回错误编号和错误文字说明,有 KeyValuePair 就很方便
 *     return new KeyValuePair(Integer,String)(5,"error message");
 * 返回三个值可以用
 *  return new KeyValuePair ( Integer,KeyValuePair(String,Object))(5,
 *      new KeyValuePair(String,Object)("error message",otherObje));
 * 以此类推可以返回多个数值
 * 
 * 建议使用
 * @see org.apache.commons.lang3.tuple.MutablePair
 * 为什么会有这个类是因为写这个类的时候我不知道有MutablePair类。
 * 这个键值用于返回多个值,这样的变量一般都是不可变的在这种情况下可以使用 ImmutablePair类
 * 
 * @author codefan
 * @param   左边的类型
 * @param    右边的类型
 */
@SuppressWarnings("unused")
public class KeyValuePair{
    private K key;
    private V value;

    public KeyValuePair(){

    }

    public KeyValuePair(K key,V value){
        this.key = key;
        this.value = value;
    }

    public static  KeyValuePair of(final K key, final V value) {
        return new KeyValuePair<>(key, value);
    }

    public K getKey() {
        return key;
    }

    public K getLeft() {
        return key;
    }

    public void setKey(K key) {
        this.key = key;
    }

    public V getValue() {
        return value;
    }

    public V getRight() {
        return value;
    }

    public void setValue(V value) {
        this.value = value;
    }

    /*public V setValue(V value) {
        V oldValue = this.value;
        this.value = value;
        return oldValue;
    }*/

}




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