Entry.java

浏览该文件的文档.

package com.netease.nimlib.sdk.util;

import java.io.Serializable;
import java.util.Objects;

/**
 * 可序列化的键值对
 */
public class Entry<K extends Serializable, V extends Serializable> implements Serializable {
    public final K key;
    public final V value;

    /**
     * Constructor for a Entry.
     *
     * @param key   the key object in the entry
     * @param value the value object in the entry
     */
    public Entry(K key, V value) {
        this.key = key;
        this.value = value;
    }

    /**
     * Compute a hash code using the hash codes of the underlying objects
     *
     * @return a hashcode of the Entry
     */
    @Override
    public int hashCode() {
        return (key == null ? 0 : key.hashCode()) ^ (value == null ? 0 : value.hashCode());
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Entry)) {
            return false;
        }
        Entry<?, ?> entry = (Entry<?, ?>) o;
        return Objects.equals(key, entry.key) && Objects.equals(value, entry.value);
    }

    /**
     * Convenience method for creating an appropriately typed entry.
     *
     * @param a the key object in the entry
     * @param b the value object in the entry
     * @return a Entry that is templatized with the types of a and b
     */
    public static <A extends Serializable, B extends Serializable> Entry<A, B> create(A a, B b) {
        return new Entry<>(a, b);
    }
}