Java ReadableByteChannel Read infiniteReadableByteChannelFor(ByteBuffer... buffers)

Description

Creates a ReadableByteChannel for a given list of ByteBuffers that does not report the end of the stream

License

MIT License

Parameter

Parameter	Description
buffers	The buffers to read frmo

Return

The created ReadableByteChannel

Declaration

public static ReadableByteChannel infiniteReadableByteChannelFor(ByteBuffer... buffers) 

Method Source Code

//package com.java2s;
/*//from   www  . j  a  va  2 s .c o  m
 * Copyright (c) 2010 Matthew J. Francis and Contributors of the Bobbin Project
 * This file is distributed under the MIT licence. See the LICENCE file for further information.
 */

import java.io.ByteArrayInputStream;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;

public class Main {
    /**
     * Creates a ReadableByteChannel for a given byte array that does not report the end of the
     * stream
     *
     * @param bytes The byte array to create a ReadableByteChannel for
     * @return The created ReadableByteChannel
     */
    public static ReadableByteChannel infiniteReadableByteChannelFor(byte[] bytes) {

        ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
        final ReadableByteChannel byteChannel = Channels.newChannel(inputStream);

        ReadableByteChannel wrappedChannel = new ReadableByteChannel() {
            public int read(ByteBuffer dst) throws IOException {
                int bytesRead = byteChannel.read(dst);
                return bytesRead < 0 ? 0 : bytesRead;

            }

            public void close() throws IOException {
            }

            public boolean isOpen() {
                return true;
            }
        };

        return wrappedChannel;

    }

    /**
     * Creates a ReadableByteChannel for a given list of ByteBuffers that does not report the end of
     * the stream
     *
     * @param buffers The buffers to read frmo
     * @return The created ReadableByteChannel
     */
    public static ReadableByteChannel infiniteReadableByteChannelFor(ByteBuffer... buffers) {

        int totalSize = 0;
        for (ByteBuffer buffer : buffers) {
            totalSize += buffer.remaining();
        }
        final ByteBuffer assembledBuffer = ByteBuffer.allocate(totalSize);
        for (ByteBuffer buffer : buffers) {
            assembledBuffer.put(buffer);
        }
        assembledBuffer.rewind();

        ReadableByteChannel wrappedChannel = new ReadableByteChannel() {
            public int read(ByteBuffer dst) throws IOException {
                int bytesRead = Math.min(assembledBuffer.capacity() - assembledBuffer.position(), dst.remaining());
                assembledBuffer.limit(assembledBuffer.position() + bytesRead);
                dst.put(assembledBuffer);
                return bytesRead;

            }

            public void close() throws IOException {
            }

            public boolean isOpen() {
                return true;
            }
        };

        return wrappedChannel;

    }
}

Related

1. copyChannels(ReadableByteChannel in, WritableByteChannel out)
2. copyChannels(ReadableByteChannel input, WritableByteChannel output, int bufferSize)
3. fill(ReadableByteChannel in, ByteBuffer buffer)
4. getNextVIntAsLong(ByteBuffer buffer, ReadableByteChannel readChannel)
5. read(ReadableByteChannel channel, ByteBuffer buffer)
6. read(ReadableByteChannel channel, ByteBuffer buffer)
7. read(ReadableByteChannel channel, ByteBuffer[] dsts)
8. read(ReadableByteChannel channel, ByteBuffer[] dsts, int offset, int length)