StreamUtils.java

/*
 * Copyright (C) 2015 Ticketmaster
 *
 * 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 com.ticketmaster.servos.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamUtils {

    private static final int BUFFER_SIZE = 0x1000;

    private StreamUtils() { }

    /**
     * Creates a {@code byte[]} from reading the entirety of an {@link java.io.InputStream}. May return an
     * empty array but never {@code null}.
     * <p>
     * Copied from Guava's {@code ByteStreams} class.
     */
    public static byte[] streamToBytes(InputStream stream) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        if (stream != null) {
            byte[] buf = new byte[BUFFER_SIZE];
            int r;
            while ((r = stream.read(buf)) != -1) {
                baos.write(buf, 0, r);
            }
        }
        return baos.toByteArray();
    }
}