org.cloudfoundry.util.OperationUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of cloudfoundry-util Show documentation

The newest version!

/*
 * Copyright 2013-2021 the original author or authors.
 *
 * 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.
 */

package org.cloudfoundry.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import reactor.core.Exceptions;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

/**
 * Utilities with operations that do not (yet) exist
 */
public final class OperationUtils {

    private OperationUtils() {}

    /**
     * Operation to collect a {@code Flux} into a contiguous single byte array, delivered as a single element of a {@code Mono}.
     *
     * @param bytes a Flux of 0 or more byte arrays
     * @return a Mono of a byte array
     */
    public static Mono collectByteArray(Flux bytes) {
        return bytes.reduceWith(
                        ByteArrayOutputStream::new,
                        (prev, next) -> {
                            try {
                                prev.write(next);
                            } catch (IOException e) {
                                throw Exceptions.propagate(e);
                            }
                            return prev;
                        })
                .map(ByteArrayOutputStream::toByteArray);
    }
}