FixedCompositeByteBuf Class — netty Architecture

Source Code

buffer/src/main/java/io/netty/buffer/FixedCompositeByteBuf.java lines 36–688

final class FixedCompositeByteBuf extends AbstractReferenceCountedByteBuf {
    private static final ByteBuf[] EMPTY = { Unpooled.EMPTY_BUFFER };
    private final int nioBufferCount;
    private final int capacity;
    private final ByteBufAllocator allocator;
    private final ByteOrder order;
    private final ByteBuf[] buffers;
    private final boolean direct;

    FixedCompositeByteBuf(ByteBufAllocator allocator, ByteBuf... buffers) {
        super(AbstractByteBufAllocator.DEFAULT_MAX_CAPACITY);
        if (buffers.length == 0) {
            this.buffers = EMPTY;
            order = ByteOrder.BIG_ENDIAN;
            nioBufferCount = 1;
            capacity = 0;
            direct = Unpooled.EMPTY_BUFFER.isDirect();
        } else {
            ByteBuf b = buffers[0];
            this.buffers = buffers;
            boolean direct = true;
            int nioBufferCount = b.nioBufferCount();
            int capacity = b.readableBytes();
            order = b.order();
            for (int i = 1; i < buffers.length; i++) {
                b = buffers[i];
                if (buffers[i].order() != order) {
                    throw new IllegalArgumentException("All ByteBufs need to have same ByteOrder");
                }
                nioBufferCount += b.nioBufferCount();
                capacity += b.readableBytes();
                if (!b.isDirect()) {
                    direct = false;
                }
            }
            this.nioBufferCount = nioBufferCount;
            this.capacity = capacity;
            this.direct = direct;
        }
        setIndex(0, capacity());
        this.allocator = allocator;
    }

    @Override
    public boolean isWritable() {
        return false;
    }

    @Override
    public boolean isWritable(int size) {
        return false;
    }

    @Override
    public ByteBuf discardReadBytes() {
        throw new ReadOnlyBufferException();
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
        throw new ReadOnlyBufferException();
    }

    @Override
    public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
        throw new ReadOnlyBufferException();
    }

    @Override
    public ByteBuf setBytes(int index, ByteBuffer src) {
        throw new ReadOnlyBufferException();
    }

    @Override
    public ByteBuf setByte(int index, int value) {
        throw new ReadOnlyBufferException();
    }

    @Override
    protected void _setByte(int index, int value) {
        throw new ReadOnlyBufferException();