Java ReadableByteChannel Read copyChannels(ReadableByteChannel input, WritableByteChannel output, int bufferSize)

Description

copy Channels

License

Apache License

Declaration

public static long copyChannels(ReadableByteChannel input, WritableByteChannel output, int bufferSize)
            throws IOException 

Method Source Code

//package com.java2s;
/*/*from www  . ja v  a2  s.co m*/
 *    Copyright 2017 Frederic Thevenet
 *
 *    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.io.IOException;

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

public class Main {
    private static final int DEFAULT_COPY_BUFFER_SIZE = 32 * 1024;

    public static long copyChannels(ReadableByteChannel input, WritableByteChannel output) throws IOException {
        return copyChannels(input, output, DEFAULT_COPY_BUFFER_SIZE);
    }

    public static long copyChannels(ReadableByteChannel input, WritableByteChannel output, int bufferSize)
            throws IOException {
        ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
        long count = 0;
        while (input.read(buffer) != -1) {
            buffer.flip();
            count += output.write(buffer);
            buffer.compact();
        }
        buffer.flip();
        while (buffer.hasRemaining()) {
            count += output.write(buffer);
        }
        return count;
    }
}

Related

1. copyChannels(ReadableByteChannel in, WritableByteChannel out)
2. fill(ReadableByteChannel in, ByteBuffer buffer)
3. getNextVIntAsLong(ByteBuffer buffer, ReadableByteChannel readChannel)
4. infiniteReadableByteChannelFor(ByteBuffer... buffers)
5. read(ReadableByteChannel channel, ByteBuffer buffer)