AbstractUnpooledSlicedByteBuf.java — netty Source File

Source Code

/*
 * Copyright 2016 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.ByteProcessor;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.FileChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
import java.nio.charset.Charset;

import static io.netty.util.internal.MathUtil.isOutOfBounds;

abstract class AbstractUnpooledSlicedByteBuf extends AbstractDerivedByteBuf {
    private final ByteBuf buffer;
    private final int adjustment;

    AbstractUnpooledSlicedByteBuf(ByteBuf buffer, int index, int length) {
        super(length);
        checkSliceOutOfBounds(index, length, buffer);

        if (buffer instanceof AbstractUnpooledSlicedByteBuf) {
            this.buffer = ((AbstractUnpooledSlicedByteBuf) buffer).buffer;
            adjustment = ((AbstractUnpooledSlicedByteBuf) buffer).adjustment + index;
        } else if (buffer instanceof DuplicatedByteBuf) {
            this.buffer = buffer.unwrap();
            adjustment = index;
        } else {
            this.buffer = buffer;
            adjustment = index;
        }

        initLength(length);
        writerIndex(length);
    }

    /**
     * Called by the constructor before {@link #writerIndex(int)}.
     * @param length the {@code length} argument from the constructor.
     */
    void initLength(int length) {
    }
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