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// *                                                                                                                         *
// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
// *                                                                                                                         *
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package org.apache.juneau.utils;

import static org.apache.juneau.internal.ObjectUtils.*;

import org.apache.juneau.internal.*;

/**
 * Represents a simple tuple of 4 objects.
 *
 * <ul class='seealso'>
 * 	<li class='extlink'>{@source}
 * </ul>
 *
 * @param <A> Object 1 type.
 * @param <B> Object 2 type.
 * @param <C> Object 3 type.
 * @param <D> Object 4 type.
 */
public class Tuple4<A,B,C,D> {

	/**
	 * Static creator.
	 *
	 * @param <A> Object 1 type.
	 * @param <B> Object 2 type.
	 * @param <C> Object 3 type.
	 * @param <D> Object 4 type.
	 * @param a Object 1.
	 * @param b Object 2.
	 * @param c Object 3.
	 * @param d Object 4.
	 * @return A new tuple object.
	 */
	public static <A,B,C,D> Tuple4<A,B,C,D> of(A a, B b, C c, D d) {
		return new Tuple4<>(a,b,c,d);
	}

	private final A a;
	private final B b;
	private final C c;
	private final D d;

	/**
	 * Constructor.
	 *
	 * @param a Object 1.
	 * @param b Object 2.
	 * @param c Object 3.
	 * @param d Object 4.
	 */
	public Tuple4(A a, B b, C c, D d) {
		this.a = a;
		this.b = b;
		this.c = c;
		this.d = d;
	}

	/**
	 * Returns the first object in this tuple.
	 *
	 * @return The first object in this tuple.
	 */
	public A getA() {
		return a;
	}

	/**
	 * Returns the second object in this tuple.
	 *
	 * @return The second object in this tuple.
	 */
	public B getB() {
		return b;
	}

	/**
	 * Returns the third object in this tuple.
	 *
	 * @return The third object in this tuple.
	 */
	public C getC() {
		return c;
	}

	/**
	 * Returns the fourth object in this tuple.
	 *
	 * @return The fourth object in this tuple.
	 */
	public D getD() {
		return d;
	}

	@Override /* Object */
	public int hashCode() {
		return HashCode.of(a,b,c,d);
	}

	@Override /* Object */
	public boolean equals(Object o) {
		return o instanceof Tuple4 && eq(this, (Tuple4<?,?,?,?>)o, (x,y)->eq(x.a,y.a) && eq(x.b,y.b) && eq(x.c,y.c) && eq(x.d,y.d));
	}
}
