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 }