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| 1 | /* | ||
| 2 | * Copyright (c) 2001, 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 | |||
| 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 | } | ||