J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.net.www.http; |
| 27 | |
| 28 | import java.io.*; |
| 29 | import java.net.*; |
| 30 | |
| 31 | /** |
| 32 | * Instances of this class are returned to applications for the purpose of |
| 33 | * sending user data for a HTTP POST or PUT request. 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 | |
| 43 | public 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 | * ouput 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 | } |