/*******************************************************************************
 * Copyright (c) 2016 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Semantum Oy - initial API and implementation
 *******************************************************************************/
package org.simantics.db.function;

import java.util.Objects;

import org.simantics.db.exception.DatabaseException;

/**
 * Represents an operation that accepts two input arguments and returns no
 * result and can throw database exceptions. This is the two-arity
 * specialization of {@link DbConsumer}. Unlike most other functional interfaces,
 * {@code BiDbConsumer} is expected to operate via side-effects.
 *
 * @param <T>
 *            the type of the first argument to the operation
 * @param <U>
 *            the type of the second argument to the operation
 *
 * @see Consumer
 * @since 1.22.1 & 1.24.0
 */
@FunctionalInterface
public interface DbBiConsumer<T, U> {

    /**
     * Performs this operation on the given arguments.
     *
     * @param t the first input argument
     * @param u the second input argument
     */
    void accept(T t, U u) throws DatabaseException;

    /**
     * Returns a composed {@code BiConsumer} 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 BiConsumer} that performs in sequence this
     * operation followed by the {@code after} operation
     * @throws NullPointerException if {@code after} is null
     */
    default DbBiConsumer<T, U> andThen(DbBiConsumer<? super T, ? super U> after) {
        Objects.requireNonNull(after);

        return (l, r) -> {
            accept(l, r);
            after.accept(l, r);
        };
    }
}