Java ReadableByteChannel Copy fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)

Description

Performs a fast channel copy from src to dest .

License

Open Source License

Parameter

Parameter	Description
src	ReadableByteChannel
dest	WritableByteChannel

Exception

Parameter	Description
IOException	an exception

Declaration

public static void fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException 

Method Source Code

//package com.java2s;
/*/*from  ww w . j  a  va  2  s  .  co m*/
 * The MIT License
 *
 * Copyright (c) 2009, 2010 Stefan Saasen
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;

public class Main {
    /**
     * The default buffer size to use.
     */
    private static final int BUFFER_SIZE = 4 * 1024;

    /**
     * Performs a fast channel copy from {@code src} to {@code dest}.
     * <p>
     * Does <strong>NOT</strong> close the channels!
     * 
     * @param src
     *            ReadableByteChannel
     * @param dest
     *            WritableByteChannel
     * @throws IOException
     */
    public static void fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
            throws IOException {
        final ByteBuffer buffer = ByteBuffer.allocateDirect(4 * BUFFER_SIZE);
        while (src.read(buffer) != -1) {
            buffer.flip();
            dest.write(buffer);
            buffer.compact();
        }
        buffer.flip();
        while (buffer.hasRemaining()) {
            dest.write(buffer);
        }
    }
}

Related

1. copy(ReadableByteChannel inputChannel, WritableByteChannel outputChannel)
2. copy(ReadableByteChannel source, WritableByteChannel destination)
3. copy(ReadableByteChannel src, WritableByteChannel dest)
4. copyTo(ReadableByteChannel from, WritableByteChannel to)
5. fastChannelCopy(final ReadableByteChannel input, final WritableByteChannel output, long toRead)
6. fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
7. fastChannelCopy(ReadableByteChannel src, WritableByteChannel dest)
8. fastCopy(final ReadableByteChannel src, final WritableByteChannel dest)