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    • com.jchanghong.core.lang.Tuple Maven / Gradle / Ivy

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    package com.jchanghong.core.lang;

import com.jchanghong.core.clone.CloneSupport;
import com.jchanghong.core.collection.ArrayIter;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Iterator;

/**
 * 不可变数组类型，用于多值返回
    
 * 多值可以支持每个元素值类型不同
 * 
 * @author Looly
 *
 */
public class Tuple extends CloneSupport implements Iterable, Serializable{
	private static final long serialVersionUID = -7689304393482182157L;
	
	private final Object[] members;
	private int hashCode;
	private boolean cacheHash;
	
	/**
	 * 构造
	 * @param members 成员数组
	 */
	public Tuple(Object... members) {
		this.members = members;
	}
	
	/**
	 * 获取指定位置元素
	 * @param  返回对象类型
	 * @param index 位置
	 * @return 元素
	 */
	@SuppressWarnings("unchecked")
	public  T get(int index){
		return (T) members[index];
	}
	
	/**
	 * 获得所有元素
	 * @return 获得所有元素
	 */
	public Object[] getMembers(){
		return this.members;
	}

	/**
	 * 缓存Hash值，当为true时，此对象的hash值只被计算一次，常用于Tuple中的值不变时使用。
	 * 注意：当为true时，member变更对象后，hash值不会变更。
	 *
	 * @param cacheHash 是否缓存hash值
	 * @return this
	 * @since 5.2.1
	 */
	public Tuple setCacheHash(boolean cacheHash){
		this.cacheHash = cacheHash;
		return this;
	}
	
	@Override
	public int hashCode() {
		if(this.cacheHash && 0 != this.hashCode){
			return this.hashCode;
		}
		final int prime = 31;
		int result = 1;
		result = prime * result + Arrays.deepHashCode(members);
		if(this.cacheHash){
			this.hashCode = result;
		}
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		Tuple other = (Tuple) obj;
		return false != Arrays.deepEquals(members, other.members);
	}

	@Override
	public String toString() {
		return Arrays.toString(members);
	}

	@SuppressWarnings("NullableProblems")
	@Override
	public Iterator iterator() {
		return new ArrayIter<>(members);
	}
}
    
    
    
    

    




    
    
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