/*
 * Copyright (C) 2020-2022 Sebastiano Vigna
 *
 * 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 PACKAGE;

import java.util.function.BinaryOperator;

/** A type-specific {@link BinaryOperator}; provides methods operating both on objects
 * and on primitives.
 *
 * @see BinaryOperator
 * @since 8.5.0
 */

@FunctionalInterface
#if ! KEY_CLASS_Boolean
public interface KEY_BINARY_OPERATOR KEY_GENERIC extends BinaryOperator<KEY_GENERIC_CLASS>, JDK_PRIMITIVE_BINARY_OPERATOR {
#else
public interface KEY_BINARY_OPERATOR KEY_GENERIC extends BinaryOperator<KEY_GENERIC_CLASS> {
#endif

	/**
	 * Computes the operator on the given inputs.
	 *
	 * @param x the first input.
	 * @param y the second input.
	 * @return the output of the operator on the given inputs.
	 */
	KEY_TYPE apply(KEY_TYPE x, KEY_TYPE y);

#if KEYS_INT_LONG_DOUBLE
	/** {@inheritDoc}
	 *
	 * @implSpec This default implementation delegates to {@link #apply}.
	 * @deprecated Please use {@link #apply}.
	 */
#else
	/** {@inheritDoc}
	 *
	 * @implSpec This default implementation delegates to
	 * {@link #apply} after narrowing down the arguments to the
	 * actual key type, throwing an exception if the arguments cannot be
	 * represented in the restricted domain. This is done for interoperability
	 * with the Java 8 function environment. The use of this method discouraged, as
	 * unexpected errors can occur.
	 *
	 * @throws IllegalArgumentException If the given operands are not an element of the key domain.
	 * @since 8.5.0
	 * @deprecated Please use {@link #apply}.
	 */
#endif

#if ! KEY_CLASS_Boolean
	@Deprecated
	@Override
	default KEY_TYPE_WIDENED JDK_PRIMITIVE_BINARY_OPERATOR_APPLY(final KEY_TYPE_WIDENED x, final KEY_TYPE_WIDENED y) {
		return apply(KEY_NARROWING(x), KEY_NARROWING(y));
	}
#endif

	/** {@inheritDoc}
	 * @deprecated Please use the corresponding type-specific method instead. */
	@Deprecated
	@Override
	@SuppressWarnings("boxing")
	default KEY_CLASS apply(final KEY_CLASS x, final KEY_CLASS y) {
		return apply(x.KEY_VALUE(), y.KEY_VALUE());
	}
}
