1/*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.net.www.http;
27
28import java.io.*;
29import java.net.*;
30
31/**
32 * Instances of this class are returned to applications for the purpose of
33 * sending user data for a HTTP request (excluding TRACE). This class is used
34 * when the content-length will be specified in the header of the request.
35 * The semantics of ByteArrayOutputStream are extended so that
36 * when close() is called, it is no longer possible to write
37 * additional data to the stream. From this point the content length of
38 * the request is fixed and cannot change.
39 *
40 * @author Michael McMahon
41 */
42
43public class PosterOutputStream extends ByteArrayOutputStream {
44
45    private boolean closed;
46
47    /**
48     * Creates a new output stream for POST user data
49     */
50    public PosterOutputStream () {
51        super (256);
52    }
53
54    /**
55     * Writes the specified byte to this output stream.
56     *
57     * @param   b   the byte to be written.
58     */
59    public synchronized void write(int b) {
60        if (closed) {
61            return;
62        }
63        super.write (b);
64    }
65
66    /**
67     * Writes <code>len</code> bytes from the specified byte array
68     * starting at offset <code>off</code> to this output stream.
69     *
70     * @param   b     the data.
71     * @param   off   the start offset in the data.
72     * @param   len   the number of bytes to write.
73     */
74    public synchronized void write(byte b[], int off, int len) {
75        if (closed) {
76            return;
77        }
78        super.write (b, off, len);
79    }
80
81    /**
82     * Resets the <code>count</code> field of this output
83     * stream to zero, so that all currently accumulated output in the
84     * output stream is discarded. The output stream can be used again,
85     * reusing the already allocated buffer space. If the output stream
86     * has been closed, then this method has no effect.
87     *
88     * @see     java.io.ByteArrayInputStream#count
89     */
90    public synchronized void reset() {
91        if (closed) {
92            return;
93        }
94        super.reset ();
95    }
96
97    /**
98     * After close() has been called, it is no longer possible to write
99     * to this stream. Further calls to write will have no effect.
100     */
101    public synchronized void close() throws IOException {
102        closed = true;
103        super.close ();
104    }
105}
106