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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 2007, 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 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 | +} | |