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A lightweight alternative to Java 8 sequential Stream

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/*
 * Copyright 2016 Daniel Skogquist Åborg
 *
 * 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.d2ab.function.doubles;

import java.util.function.BiPredicate;

/**
 * A specialization of {@link BiPredicate} for {@code double} values.
 */
@FunctionalInterface
public interface DoubleBiPredicate {
	/**
	 * Test this predicate against the given two {@code double}s.
	 */
	boolean test(double c1, double c2);

	/**
	 * Negate this predicate, returning a predicate that always returns the opposite values.
	 */
	default DoubleBiPredicate negate() {
		return (x1, x2) -> !test(x1, x2);
	}

	/**
	 * Combine this predicate with another predicate using "{@code and}" boolean logic.
	 */
	default DoubleBiPredicate and(DoubleBiPredicate predicate) {
		return (x1, x2) -> test(x1, x2) && predicate.test(x1, x2);
	}

	/**
	 * Combine this predicate with another predicate using "{@code or}" boolean logic.
	 */
	default DoubleBiPredicate or(DoubleBiPredicate predicate) {
		return (x1, x2) -> test(x1, x2) || predicate.test(x1, x2);
	}
}