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   /*
    * 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:
    *
    *   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 io.netty.buffer;
  
  import java.nio.ByteBuffer;
  
  /**
   * Abstract base class for {@link ByteBuf} implementations that wrap another
   * {@link ByteBuf}.
   *
   * @deprecated Do not use.
   */
  @Deprecated
  public abstract class AbstractDerivedByteBuf extends AbstractByteBuf {
  
      protected AbstractDerivedByteBuf(int maxCapacity) {
          super(maxCapacity);
      }
  
      @Override
      public final int refCnt() {
          return unwrap().refCnt();
      }
  
      @Override
      public final ByteBuf retain() {
          unwrap().retain();
          return this;
      }
  
      @Override
      public final ByteBuf retain(int increment) {
          unwrap().retain(increment);
          return this;
      }
  
      @Override
      public final boolean release() {
          return unwrap().release();
      }
  
      @Override
      public final boolean release(int decrement) {
          return unwrap().release(decrement);
      }
  
      @Override
      public ByteBuffer internalNioBuffer(int index, int length) {
          return nioBuffer(index, length);
      }
  
      @Override
      public ByteBuffer nioBuffer(int index, int length) {
          return unwrap().nioBuffer(index, length);
      }
  }