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1   /*
2    * Copyright 2013 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.buffer;
17  
18  import io.netty.util.ReferenceCounted;
19  
20  /**
21   * A packet which is send or receive.
22   */
23  public interface ByteBufHolder extends ReferenceCounted {
24  
25      /**
26       * Return the data which is held by this {@link ByteBufHolder}.
27       */
28      ByteBuf content();
29  
30      /**
31       * Creates a deep copy of this {@link ByteBufHolder}.
32       */
33      ByteBufHolder copy();
34  
35      /**
36       * Duplicates this {@link ByteBufHolder}. Be aware that this will not automatically call {@link #retain()}.
37       */
38      ByteBufHolder duplicate();
39  
40      /**
41       * Duplicates this {@link ByteBufHolder}. This method returns a retained duplicate unlike {@link #duplicate()}.
42       *
43       * @see ByteBuf#retainedDuplicate()
44       */
45      ByteBufHolder retainedDuplicate();
46  
47      /**
48       * Returns a new {@link ByteBufHolder} which contains the specified {@code content}.
49       */
50      ByteBufHolder replace(ByteBuf content);
51  
52      @Override
53      ByteBufHolder retain();
54  
55      @Override
56      ByteBufHolder retain(int increment);
57  
58      @Override
59      ByteBufHolder touch();
60  
61      @Override
62      ByteBufHolder touch(Object hint);
63  }