/*
* Copyright 2011-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazonaws.codegen.utils;
import java.util.function.Function;
public class FunctionalUtils {
/**
* Takes a functional interface that throws an exception and returns a {@link Function} that deals with that exception by
* wrapping in a runtime exception. Useful for APIs that use the standard Java functional interfaces that don't throw checked
* exceptions.
*
* @param unsafeFunc Functional interface that throws checked exception.
* @param <T> Input
* @param <R> Output
* @return New {@link Function} that handles checked exception.
*/
public static <T, R> Function<T, R> safeFunction(ExceptionThrowingFunction<T, R> unsafeFunc) {
return t -> {
try {
return unsafeFunc.apply(t);
} catch (Exception e) {
throw new RuntimeException(e);
}
};
}
/**
* Equivalent of {@link Function} that throws a checked exception.
*/
@FunctionalInterface
public interface ExceptionThrowingFunction<T, R> {
R apply(T t) throws Exception;
}
}