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Java > Open Source Codes > org > jboss > util > stream > CRLFPrintWriter


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.util.stream;
23
24 import java.io.IOException JavaDoc;
25 import java.io.PrintWriter JavaDoc;
26 import java.io.OutputStream JavaDoc;
27 import java.io.InterruptedIOException JavaDoc;
28 import java.io.Writer JavaDoc;
29
30 /**
31  * A <tt>PrintWriter</tt> that ends lines with a carriage return-line feed
32  * (<tt>CRLF</tt>).
33  *
34  * <h3>Concurrency</h3>
35  * This class is <b>as</b> synchronized as <tt>PrintWriter</tt>.
36  *
37  * @version <tt>$Revision: 1958 $</tt>
38  * @author <a HREF="mailto:jason@planet57.com">Jason Dillon</a>
39  */
40 public class CRLFPrintWriter
41    extends PrintWriter JavaDoc
42 {
43    protected boolean autoFlush = false;
44
45    public CRLFPrintWriter(final Writer JavaDoc out) {
46       super(out);
47    }
48
49    public CRLFPrintWriter(final Writer JavaDoc out, final boolean autoFlush) {
50       super(out, autoFlush);
51       this.autoFlush = autoFlush;
52    }
53
54    public CRLFPrintWriter(final OutputStream JavaDoc out) {
55       super(out);
56    }
57
58    public CRLFPrintWriter(final OutputStream JavaDoc out, final boolean autoFlush) {
59       super(out, autoFlush);
60       this.autoFlush = autoFlush;
61    }
62
63    protected void ensureOpen() throws IOException JavaDoc {
64       if (out == null)
65          throw new IOException JavaDoc("Stream closed");
66    }
67
68    public void println() {
69       try {
70          synchronized (lock) {
71             ensureOpen();
72
73             out.write("\r\n");
74
75             if (autoFlush) {
76                out.flush();
77             }
78          }
79       }
80       catch (InterruptedIOException JavaDoc e) {
81          Thread.currentThread().interrupt();
82       }
83       catch (IOException JavaDoc e) {
84          setError();
85       }
86    }
87 }
88
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