io.evitadb.function.ExceptionRethrowingFunction Maven / Gradle / Ivy
/*
*
* _ _ ____ ____
* _____ _(_) |_ __ _| _ \| __ )
* / _ \ \ / / | __/ _` | | | | _ \
* | __/\ V /| | || (_| | |_| | |_) |
* \___| \_/ |_|\__\__,_|____/|____/
*
* Copyright (c) 2023
*
* Licensed under the Business Source License, Version 1.1 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://github.com/FgForrest/evitaDB/blob/master/LICENSE
*
* 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 io.evitadb.function;
import java.util.Objects;
import java.util.function.Function;
/**
* Represents a function that accepts two arguments and produces a result.
* This is the two-arity specialization of {@link Function}.
*
* This is a functional interface
* whose functional method is {@link #apply(Object)}.
*
* @param the type of the second argument to the function
* @param the type of the result of the function
*
* @see Function
*
* @apiNote inspired by the JDK interface
* @author Jan Novotný ([email protected]), FG Forrest a.s. (c) 2023
*/
@FunctionalInterface
public interface ExceptionRethrowingFunction {
/**
* Applies this function to the given arguments.
*
* @param u the second function argument
* @return the function result
*/
R apply(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 ExceptionRethrowingFunction andThen(Function after) {
Objects.requireNonNull(after);
return (U u) -> after.apply(apply(u));
}
}