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   /*
    * 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:
    *
    *   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.jboss.netty.handler.codec.serialization;
  
  import java.io.FilterInputStream;
  import java.io.InputStream;
  
  /**
   * {@link FilterInputStream} which allows a user to change the underlying
   * stream at any time.
   */
  final class SwitchableInputStream extends FilterInputStream {
  
      /**
       * Creates a new instance without initializing the reference to the
       * underlying stream.
       */
      SwitchableInputStream() {
          super(null);
      }
  
      /**
       * Creates a new instance with the initial reference to the underlying
       * stream.
       */
      void switchStream(InputStream in) {
          this.in = in;
      }
  }