package it.cavallium.warppi.flow;

import java.util.Objects;

public interface Consumer<T> {

	/**
	 * Performs this operation on the given argument.
	 *
	 * @param t
	 *            the input argument
	 */
	void accept(T t);

	/**
	 * Returns a composed {@code Consumer} that performs, in sequence, this
	 * operation followed by the {@code after} operation. If performing either
	 * operation throws an exception, it is relayed to the caller of the
	 * composed operation. If performing this operation throws an exception,
	 * the {@code after} operation will not be performed.
	 *
	 * @param after
	 *            the operation to perform after this operation
	 * @return a composed {@code Consumer} that performs in sequence this
	 *         operation followed by the {@code after} operation
	 * @throws NullPointerException
	 *             if {@code after} is null
	 */
	default Consumer<T> andThen(Consumer<? super T> after) {
		Objects.requireNonNull(after);
		return (T t) -> {
			accept(t);
			after.accept(t);
		};
	}
}