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Core ACS AEM Commons OSGi Bundle. Includes commons utilities.

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/*
 * #%L
 * ACS AEM Commons Bundle
 * %%
 * Copyright (C) 2016 Adobe
 * %%
 * 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.
 * #L%
 */
package com.adobe.acs.commons.functions;

import org.osgi.annotation.versioning.ConsumerType;

/**
 * Created work-alike for functionality not introduced until Java 8
 * Represents a function that accepts two arguments and produces a result.
 * This is the two-arity specialization of Function.
 *
 * @param  the type of the first argument to the function
 * @param  the type of the second argument to the function
 * @param  the type of the result of the function
 *
 */
@ConsumerType
@FunctionalInterface
@SuppressWarnings("squid:S00112")
public interface CheckedBiFunction {
    static  CheckedBiFunction from(java.util.function.BiFunction function) {
        return function == null ? null : (t, u) -> function.apply(t, u);
    }

    /**
     * Applies this function to the given arguments.
     *
     * @param t the first function argument
     * @param u the second function argument
     * @return the function result
     * @throws java.lang.Exception
     */
    R apply(T t, U u) throws Exception;

    /**
     * Returns a composed function that first applies this function to
     * its input, and then applies the {@code after} function to the result.
     * If evaluation of either function throws an exception, it is relayed to
     * the caller of the composed function.
     *
     * @param  the type of output of the {@code after} function, and of the
     *           composed function
     * @param after the function to apply after this function is applied
     * @return a composed function that first applies this function and then
     * applies the {@code after} function
     * @throws NullPointerException if after is null
     */
    default  CheckedBiFunction andThen(final CheckedFunction after) {
        if (after == null) {
            throw new NullPointerException();
        }
        return (T t, U u) -> after.apply(apply(t, u));
    }
}