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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.lang3.function;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* A functional interface like {@link BiFunction} that declares a {@link Throwable}.
*
* @param <T> Input type 1.
* @param <U> Input type 2.
* @param <R> Return type.
* @param <E> The kind of thrown exception or error.
* @since 3.11
*/
@FunctionalInterface
public interface FailableBiFunction<T, U, R, E extends Throwable> {
/** NOP singleton */
@SuppressWarnings("rawtypes")
FailableBiFunction NOP = (t, u) -> null;
/**
* Returns The NOP singleton.
*
* @param <T> Consumed type 1.
* @param <U> Consumed type 2.
* @param <R> Return type.
* @param <E> The kind of thrown exception or error.
* @return The NOP singleton.
*/
static <T, U, R, E extends Throwable> FailableBiFunction<T, U, R, E> nop() {
return NOP;
}
/**
* Returns a composed {@link FailableBiFunction} that like {@link BiFunction#andThen(Function)}.
*
* @param <V> the output type of the {@code after} function, and of the composed function.
* @param after the operation to perform after this one.
* @return a composed {@link FailableBiFunction} that like {@link BiFunction#andThen(Function)}.
* @throws NullPointerException when {@code after} is null.
*/
default <V> FailableBiFunction<T, U, V, E> andThen(final FailableFunction<? super R, ? extends V, E> after) {
Objects.requireNonNull(after);
return (final T t, final U u) -> after.apply(apply(t, u));
}
/**
* Applies this function.
*
* @param input1 the first input for the function
* @param input2 the second input for the function
* @return the result of the function
* @throws E Thrown when the function fails.
*/
R apply(T input1, U input2) throws E;
}
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