org.zalando.riptide.ThrowingFunction Maven / Gradle / Ivy

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package org.zalando.riptide;

/*
 * ⁣
 * Riptide
 * ⁣⁣
 * Copyright (C) 2015 Zalando SE
 * ⁣⁣
 * 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.
 * ⁣
 */

import java.util.Objects;

@FunctionalInterface
public interface ThrowingFunction {

    R apply(T input) throws Exception;

    default  ThrowingFunction compose(final ThrowingFunction before) {
        Objects.requireNonNull(before);
        return (V v) -> apply(before.apply(v));
    }

    default  ThrowingFunction andThen(final ThrowingFunction after) {
        Objects.requireNonNull(after);
        return (T t) -> after.apply(apply(t));
    }

}