KeepAliveInputStream


1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   *
17   */
18  package org.apache.tools.ant.util;
19  
20  import java.io.FilterInputStream  ;
21  import java.io.IOException  ;
22  import java.io.InputStream  ;
23  
24  /**
25   * Class that can be used to wrap <tt>System.in</tt>
26   * without getting anxious about any client closing the stream.
27   *
28   * <p>
29   * In code-language it means that it is not necessary to do:
30   * <pre>
31   * if (out != System.in) {
32   *   in.close();
33   * }
34   * </pre>
35   * </p>
36   *
37   * @since Ant 1.6
38   */
39  public class KeepAliveInputStream extends FilterInputStream   {
40  
41      /**
42       * Constructor of KeepAliveInputStream.
43       *
44       * @param in an InputStream value, it should be standard input.
45       */
46      public KeepAliveInputStream(InputStream   in) {
47          super(in);
48      }
49  
50      /**
51       * This method does nothing.
52       * @throws IOException as we are overridding FilterInputStream.
53       */
54      public void close() throws IOException   {
55          // do not close the stream
56      }
57  }
58
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