Tuple2.java

/*
 * Copyright 2014-2016 the original author or 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 org.springframework.integration.dsl.support.tuple;

/**
 * A tuple that holds two values.
 *
 * @param <T1> The type of the first value held by this tuple
 * @param <T2> The type of the second value held by this tuple
 *
 * @author Jon Brisbin
 * @author Artem Bilan
 */
public class Tuple2<T1, T2> extends Tuple1<T1> {

	private static final long serialVersionUID = -565933838909569191L;

	protected final T2 t2;

	Tuple2(int size, T1 t1, T2 t2) {
		super(2, t1);
		this.t2 = t2;
	}

	/**
	 * Type-safe way to get the second object of this {@link Tuple}.
	 * @return The second object, cast to the correct type.
	 */
	public T2 getT2() {
		return this.t2;
	}

	@Override
	public Object get(int index) {
		switch (index) {
			case 0:
				return this.t1;
			case 1:
				return this.t2;
			default:
				return null;
		}
	}

	@Override
	public Object[] toArray() {
		return new Object[]{this.t1, this.t2};
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		if (!super.equals(o)) {
			return false;
		}

		Tuple2<?, ?> tuple2 = (Tuple2<?, ?>) o;

		return this.t2 != null ? this.t2.equals(tuple2.t2) : tuple2.t2 == null;

	}

	@Override
	public int hashCode() {
		int result = super.hashCode();
		result = 31 * result + (this.t2 != null ? this.t2.hashCode() : 0);
		return result;
	}

	@Override
	public String toString() {
		return super.toString() +
				(this.t2 != null ? "," + this.t2.toString() : "");
	}

}