content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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
   *
   *    http://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 org.apache.kafka.common.protocol;
  
  import org.apache.kafka.common.utils.ByteUtils;
  
  import java.nio.ByteBuffer;
  
  public class ByteBufferAccessor implements Readable, Writable {
      private final ByteBuffer buf;
  
      public ByteBufferAccessor(ByteBuffer buf) {
          this.buf = buf;
      }
  
      @Override
      public byte readByte() {
          return buf.get();
      }
  
      @Override
      public short readShort() {
          return buf.getShort();
      }
  
      @Override
      public int readInt() {
          return buf.getInt();
      }
  
      @Override
      public long readLong() {
          return buf.getLong();
      }
  
      @Override
      public double readDouble() {
          return ByteUtils.readDouble(buf);
      }
  
      @Override
      public byte[] readArray(int size) {
          int remaining = buf.remaining();
          if (size > remaining) {
              throw new RuntimeException("Error reading byte array of " + size + " byte(s): only " + remaining +
                      " byte(s) available");
          }
          byte[] arr = new byte[size];
          buf.get(arr);
          return arr;
      }
  
      @Override
      public int readUnsignedVarint() {
          return ByteUtils.readUnsignedVarint(buf);
      }
  
      @Override
      public ByteBuffer readByteBuffer(int length) {
          ByteBuffer res = buf.slice();
          res.limit(length);
  
          buf.position(buf.position() + length);
  
          return res;
      }
  
      @Override
      public void writeByte(byte val) {
          buf.put(val);
      }
  
      @Override
      public void writeShort(short val) {
          buf.putShort(val);
      }
  
      @Override
      public void writeInt(int val) {
          buf.putInt(val);
      }
  
      @Override
      public void writeLong(long val) {
          buf.putLong(val);
      }
  
      @Override
      public void writeDouble(double val) {
          ByteUtils.writeDouble(val, buf);
      }
  
      @Override
      public void writeByteArray(byte[] arr) {
          buf.put(arr);
      }
  
      @Override
      public void writeUnsignedVarint(int i) {
          ByteUtils.writeUnsignedVarint(i, buf);
      }
  
      @Override
      public void writeByteBuffer(ByteBuffer src) {
          buf.put(src.duplicate());
      }
  
      @Override
      public void writeVarint(int i) {
          ByteUtils.writeVarint(i, buf);
      }
  
      @Override
      public void writeVarlong(long i) {
          ByteUtils.writeVarlong(i, buf);
      }
  
      @Override
      public int readVarint() {
          return ByteUtils.readVarint(buf);
      }
  
      @Override
      public long readVarlong() {
          return ByteUtils.readVarlong(buf);
      }
  
      @Override
      public int remaining() {
          return buf.remaining();
      }
  
      @Override
      public Readable slice() {
          return new ByteBufferAccessor(buf.slice());
      }
  
      public void flip() {
          buf.flip();
      }
  
      public ByteBuffer buffer() {
          return buf;
      }
  }
  