01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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;
21: import java.io.IOException;
22: import java.io.OutputStream;
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 {
39:
40: /**
41: * Constructor of KeepAliveOutputStream.
42: *
43: * @param out an OutputStream value, it shoudl be standard output.
44: */
45: public KeepAliveOutputStream(OutputStream 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 {
54: // do not close the stream
55: }
56: }
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