J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996 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 | package sun.rmi.transport.proxy; |
| 26 | |
| 27 | import java.io.*; |
| 28 | |
| 29 | /** |
| 30 | * The HttpSendInputStream class is used by the HttpSendSocket class as |
| 31 | * a layer on the top of the InputStream it returns so that it can be |
| 32 | * notified of attempts to read from it. This allows the HttpSendSocket |
| 33 | * to know when it should push across its output message. |
| 34 | */ |
| 35 | class HttpSendInputStream extends FilterInputStream { |
| 36 | |
| 37 | /** the HttpSendSocket object that is providing this stream */ |
| 38 | HttpSendSocket owner; |
| 39 | |
| 40 | /** |
| 41 | * Create new filter on a given input stream. |
| 42 | * @param in the InputStream to filter from |
| 43 | * @param owner the HttpSendSocket that is providing this stream |
| 44 | */ |
| 45 | public HttpSendInputStream(InputStream in, HttpSendSocket owner) |
| 46 | throws IOException |
| 47 | { |
| 48 | super(in); |
| 49 | |
| 50 | this.owner = owner; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Mark this stream as inactive for its owner socket, so the next time |
| 55 | * a read is attempted, the owner will be notified and a new underlying |
| 56 | * input stream obtained. |
| 57 | */ |
| 58 | public void deactivate() |
| 59 | { |
| 60 | in = null; |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Read a byte of data from the stream. |
| 65 | */ |
| 66 | public int read() throws IOException |
| 67 | { |
| 68 | if (in == null) |
| 69 | in = owner.readNotify(); |
| 70 | return in.read(); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Read into an array of bytes. |
| 75 | * @param b the buffer into which the data is to be read |
| 76 | * @param off the start offset of the data |
| 77 | * @param len the maximum number of bytes to read |
| 78 | */ |
| 79 | public int read(byte b[], int off, int len) throws IOException |
| 80 | { |
| 81 | if (len == 0) |
| 82 | return 0; |
| 83 | if (in == null) |
| 84 | in = owner.readNotify(); |
| 85 | return in.read(b, off, len); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Skip bytes of input. |
| 90 | * @param n the number of bytes to be skipped |
| 91 | */ |
| 92 | public long skip(long n) throws IOException |
| 93 | { |
| 94 | if (n == 0) |
| 95 | return 0; |
| 96 | if (in == null) |
| 97 | in = owner.readNotify(); |
| 98 | return in.skip(n); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Return the number of bytes that can be read without blocking. |
| 103 | */ |
| 104 | public int available() throws IOException |
| 105 | { |
| 106 | if (in == null) |
| 107 | in = owner.readNotify(); |
| 108 | return in.available(); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Close the stream. |
| 113 | */ |
| 114 | public void close() throws IOException |
| 115 | { |
| 116 | owner.close(); |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * Mark the current position in the stream. |
| 121 | * @param readlimit how many bytes can be read before mark becomes invalid |
| 122 | */ |
| 123 | public synchronized void mark(int readlimit) |
| 124 | { |
| 125 | if (in == null) { |
| 126 | try { |
| 127 | in = owner.readNotify(); |
| 128 | } |
| 129 | catch (IOException e) { |
| 130 | return; |
| 131 | } |
| 132 | } |
| 133 | in.mark(readlimit); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Reposition the stream to the last marked position. |
| 138 | */ |
| 139 | public synchronized void reset() throws IOException |
| 140 | { |
| 141 | if (in == null) |
| 142 | in = owner.readNotify(); |
| 143 | in.reset(); |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Return true if this stream type supports mark/reset. |
| 148 | */ |
| 149 | public boolean markSupported() |
| 150 | { |
| 151 | if (in == null) { |
| 152 | try { |
| 153 | in = owner.readNotify(); |
| 154 | } |
| 155 | catch (IOException e) { |
| 156 | return false; |
| 157 | } |
| 158 | } |
| 159 | return in.markSupported(); |
| 160 | } |
| 161 | } |