/*
 * Copyright (C) 2020 The zfoo Authors
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */

package com.zfoo.protocol.model;


import java.util.Objects;

/**
 * 键值对对象，只能在构造时传入键值
 *
 * @param <K> 键类型
 * @param <V> 值类型
 * @author godotg
 * @version 3.0
 */
public class Pair<K, V> {

    private K key;
    private V value;

    public Pair() {

    }

    /**
     * 构造
     *
     * @param key   键
     * @param value 值
     */
    public Pair(K key, V value) {
        this.key = key;
        this.value = value;
    }

    /**
     * 获取键
     *
     * @return 键
     */
    public K getKey() {
        return this.key;
    }

    /**
     * 获取值
     *
     * @return 值
     */
    public V getValue() {
        return this.value;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Pair<?, ?> pair = (Pair<?, ?>) o;
        return Objects.equals(key, pair.key) && Objects.equals(value, pair.value);
    }

    @Override
    public int hashCode() {
        return Objects.hash(key, value);
    }

    @Override
    public String toString() {
        return "Pair [key=" + key + ", value=" + value + "]";
    }
}
