FixedCompositeByteBuf.java — netty Source File

Source Code

/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.buffer;

import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.RecyclableArrayList;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ReadOnlyBufferException;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.util.Collections;

/**
 * {@link ByteBuf} implementation which allows to wrap an array of {@link ByteBuf} in a read-only mode.
 * This is useful to write an array of {@link ByteBuf}s.
 */
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++) {
// ... (629 more lines)