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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  }