ByteBuf.java — netty Source File

Source Code

/*
 * Copyright 2012 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 io.netty.util.ReferenceCounted;

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 java.nio.charset.UnsupportedCharsetException;

/**
 * A random and sequential accessible sequence of zero or more bytes (octets).
 * This interface provides an abstract view for one or more primitive byte
 * arrays ({@code byte[]}) and {@linkplain ByteBuffer NIO buffers}.
 *
 * <h3>Creation of a buffer</h3>
 *
 * It is recommended to create a new buffer using the helper methods in
 * {@link Unpooled} rather than calling an individual implementation's
 * constructor.
 *
 * <h3>Random Access Indexing</h3>
 *
 * Just like an ordinary primitive byte array, {@link ByteBuf} uses
 * <a href="https://en.wikipedia.org/wiki/Zero-based_numbering">zero-based indexing</a>.
 * It means the index of the first byte is always {@code 0} and the index of the last byte is
 * always {@link #capacity() capacity - 1}.  For example, to iterate all bytes of a buffer, you
 * can do the following, regardless of its internal implementation:
 *
 * <pre>
 * {@link ByteBuf} buffer = ...;
 * for (int i = 0; i &lt; buffer.capacity(); i ++) {
 *     byte b = buffer.getByte(i);
 *     System.out.println((char) b);
 * }
 * </pre>
 *
 * <h3>Sequential Access Indexing</h3>
 *
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