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1   /*
2    * Copyright 2012 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    *   http://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 org.jboss.netty.handler.codec.serialization;
17  
18  import java.io.FilterInputStream;
19  import java.io.InputStream;
20  
21  /**
22   * {@link FilterInputStream} which allows a user to change the underlying
23   * stream at any time.
24   */
25  final class SwitchableInputStream extends FilterInputStream {
26  
27      /**
28       * Creates a new instance without initializing the reference to the
29       * underlying stream.
30       */
31      SwitchableInputStream() {
32          super(null);
33      }
34  
35      /**
36       * Creates a new instance with the initial reference to the underlying
37       * stream.
38       */
39      void switchStream(InputStream in) {
40          this.in = in;
41      }
42  }