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Java > Open Source Codes > org > apache > tools > ant > util > KeepAliveOutputStream


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.FilterOutputStream JavaDoc;
21 import java.io.IOException JavaDoc;
22 import java.io.OutputStream JavaDoc;
23
24 /**
25  * Class that can be used to wrap <tt>System.out</tt> and <tt>System.err</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.out && out!= System.err) {
32  * out.close();
33  * }
34  * </pre>
35  * </p>
36  *
37  */
38 public class KeepAliveOutputStream extends FilterOutputStream JavaDoc {
39
40     /**
41      * Constructor of KeepAliveOutputStream.
42      *
43      * @param out an OutputStream value, it shoudl be standard output.
44      */
45     public KeepAliveOutputStream(OutputStream JavaDoc out) {
46         super(out);
47     }
48
49     /**
50      * This method does nothing.
51      * @throws IOException as we are overridding FilterOutputStream.
52      */
53     public void close() throws IOException JavaDoc {
54         // do not close the stream
55 }
56 }
57
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