package com.jflyfox.util.tuple;

/**
 * 二元组
 * @param <A>
 * @param <B>
 */
public class TwoTuple<A, B> implements ITuple {

	public final A first;
	public final B second;

	public TwoTuple(A a, B b) {
		first = a;
		second = b;
	}

	public String toString() {
		return "(" + first + ", " + second + ")";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((first == null) ? 0 : first.hashCode());
		result = prime * result + ((second == null) ? 0 : second.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		@SuppressWarnings("rawtypes")
		TwoTuple other = (TwoTuple) obj;
		if (first == null) {
			if (other.first != null) {
				return false;
			}
		} else if (!first.equals(other.first)) {
			return false;
		}
		if (second == null) {
			if (other.second != null) {
				return false;
			}
		} else if (!second.equals(other.second)) {
			return false;
		}
		return true;
	}

	@Override
	public int size() {
		return 2;
	}

	@Override
	public Object[] toArray() {
		return new Object[]{first, second};
	}

}