J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2007 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 java.net; |
| 27 | |
| 28 | import java.io.FileDescriptor; |
| 29 | import java.io.FileOutputStream; |
| 30 | import java.io.IOException; |
| 31 | import java.nio.channels.FileChannel; |
| 32 | |
| 33 | /** |
| 34 | * This stream extends FileOutputStream to implement a |
| 35 | * SocketOutputStream. Note that this class should <b>NOT</b> be |
| 36 | * public. |
| 37 | * |
| 38 | * @author Jonathan Payne |
| 39 | * @author Arthur van Hoff |
| 40 | */ |
| 41 | class SocketOutputStream extends FileOutputStream |
| 42 | { |
| 43 | static { |
| 44 | init(); |
| 45 | } |
| 46 | |
| 47 | private AbstractPlainSocketImpl impl = null; |
| 48 | private byte temp[] = new byte[1]; |
| 49 | private Socket socket = null; |
| 50 | |
| 51 | /** |
| 52 | * Creates a new SocketOutputStream. Can only be called |
| 53 | * by a Socket. This method needs to hang on to the owner Socket so |
| 54 | * that the fd will not be closed. |
| 55 | * @param impl the socket output stream inplemented |
| 56 | */ |
| 57 | SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException { |
| 58 | super(impl.getFileDescriptor()); |
| 59 | this.impl = impl; |
| 60 | socket = impl.getSocket(); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Returns the unique {@link java.nio.channels.FileChannel FileChannel} |
| 65 | * object associated with this file output stream. </p> |
| 66 | * |
| 67 | * The <code>getChannel</code> method of <code>SocketOutputStream</code> |
| 68 | * returns <code>null</code> since it is a socket based stream.</p> |
| 69 | * |
| 70 | * @return the file channel associated with this file output stream |
| 71 | * |
| 72 | * @since 1.4 |
| 73 | * @spec JSR-51 |
| 74 | */ |
| 75 | public final FileChannel getChannel() { |
| 76 | return null; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Writes to the socket. |
| 81 | * @param fd the FileDescriptor |
| 82 | * @param b the data to be written |
| 83 | * @param off the start offset in the data |
| 84 | * @param len the number of bytes that are written |
| 85 | * @exception IOException If an I/O error has occurred. |
| 86 | */ |
| 87 | private native void socketWrite0(FileDescriptor fd, byte[] b, int off, |
| 88 | int len) throws IOException; |
| 89 | |
| 90 | /** |
| 91 | * Writes to the socket with appropriate locking of the |
| 92 | * FileDescriptor. |
| 93 | * @param b the data to be written |
| 94 | * @param off the start offset in the data |
| 95 | * @param len the number of bytes that are written |
| 96 | * @exception IOException If an I/O error has occurred. |
| 97 | */ |
| 98 | private void socketWrite(byte b[], int off, int len) throws IOException { |
| 99 | |
| 100 | if (len <= 0 || off < 0 || off + len > b.length) { |
| 101 | if (len == 0) { |
| 102 | return; |
| 103 | } |
| 104 | throw new ArrayIndexOutOfBoundsException(); |
| 105 | } |
| 106 | |
| 107 | FileDescriptor fd = impl.acquireFD(); |
| 108 | try { |
| 109 | socketWrite0(fd, b, off, len); |
| 110 | } catch (SocketException se) { |
| 111 | if (se instanceof sun.net.ConnectionResetException) { |
| 112 | impl.setConnectionResetPending(); |
| 113 | se = new SocketException("Connection reset"); |
| 114 | } |
| 115 | if (impl.isClosedOrPending()) { |
| 116 | throw new SocketException("Socket closed"); |
| 117 | } else { |
| 118 | throw se; |
| 119 | } |
| 120 | } finally { |
| 121 | impl.releaseFD(); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Writes a byte to the socket. |
| 127 | * @param b the data to be written |
| 128 | * @exception IOException If an I/O error has occurred. |
| 129 | */ |
| 130 | public void write(int b) throws IOException { |
| 131 | temp[0] = (byte)b; |
| 132 | socketWrite(temp, 0, 1); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Writes the contents of the buffer <i>b</i> to the socket. |
| 137 | * @param b the data to be written |
| 138 | * @exception SocketException If an I/O error has occurred. |
| 139 | */ |
| 140 | public void write(byte b[]) throws IOException { |
| 141 | socketWrite(b, 0, b.length); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Writes <i>length</i> bytes from buffer <i>b</i> starting at |
| 146 | * offset <i>len</i>. |
| 147 | * @param b the data to be written |
| 148 | * @param off the start offset in the data |
| 149 | * @param len the number of bytes that are written |
| 150 | * @exception SocketException If an I/O error has occurred. |
| 151 | */ |
| 152 | public void write(byte b[], int off, int len) throws IOException { |
| 153 | socketWrite(b, off, len); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Closes the stream. |
| 158 | */ |
| 159 | private boolean closing = false; |
| 160 | public void close() throws IOException { |
| 161 | // Prevent recursion. See BugId 4484411 |
| 162 | if (closing) |
| 163 | return; |
| 164 | closing = true; |
| 165 | if (socket != null) { |
| 166 | if (!socket.isClosed()) |
| 167 | socket.close(); |
| 168 | } else |
| 169 | impl.close(); |
| 170 | closing = false; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Overrides finalize, the fd is closed by the Socket. |
| 175 | */ |
| 176 | protected void finalize() {} |
| 177 | |
| 178 | /** |
| 179 | * Perform class load-time initializations. |
| 180 | */ |
| 181 | private native static void init(); |
| 182 | |
| 183 | } |