https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package java.net;

import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;


This stream extends FileOutputStream to implement a
SocketOutputStream. Note that this class should NOT be
public.

Author:     Jonathan Payne,      Arthur van Hoff
/**
 * This stream extends FileOutputStream to implement a
 * SocketOutputStream. Note that this class should <b>NOT</b> be
 * public.
 *
 * @author      Jonathan Payne
 * @author      Arthur van Hoff
 */
class SocketOutputStream extends FileOutputStream
{
    static {
        init();
    }

    private AbstractPlainSocketImpl impl = null;
    private byte temp[] = new byte[1];
    private Socket socket = null;

    
Creates a new SocketOutputStream. Can only be called
by a Socket. This method needs to hang on to the owner Socket so
that the fd will not be closed.

Params:
  • impl – the socket output stream inplemented
/**
     * Creates a new SocketOutputStream. Can only be called
     * by a Socket. This method needs to hang on to the owner Socket so
     * that the fd will not be closed.
     * @param impl the socket output stream inplemented
     */
    SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException {
        super(impl.getFileDescriptor());
        this.impl = impl;
        socket = impl.getSocket();
    }

    
Returns the unique FileChannel object associated with this file output stream. 
 The getChannel method of SocketOutputStream returns null since it is a socket based stream.


Returns: the file channel associated with this file output stream
Since:1.4
@specJSR-51
/**
     * Returns the unique {@link java.nio.channels.FileChannel FileChannel}
     * object associated with this file output stream. </p>
     *
     * The {@code getChannel} method of {@code SocketOutputStream}
     * returns {@code null} since it is a socket based stream.</p>
     *
     * @return  the file channel associated with this file output stream
     *
     * @since 1.4
     * @spec JSR-51
     */
    public final FileChannel getChannel() {
        return null;
    }

    
Writes to the socket.

Params:
  • fd – the FileDescriptor
  • b – the data to be written
  • off – the start offset in the data
  • len – the number of bytes that are written
Throws:
/**
     * Writes to the socket.
     * @param fd the FileDescriptor
     * @param b the data to be written
     * @param off the start offset in the data
     * @param len the number of bytes that are written
     * @exception IOException If an I/O error has occurred.
     */
    private native void socketWrite0(FileDescriptor fd, byte[] b, int off,
                                     int len) throws IOException;

    
Writes to the socket with appropriate locking of the
FileDescriptor.

Params:
  • b – the data to be written
  • off – the start offset in the data
  • len – the number of bytes that are written
Throws:
/**
     * Writes to the socket with appropriate locking of the
     * FileDescriptor.
     * @param b the data to be written
     * @param off the start offset in the data
     * @param len the number of bytes that are written
     * @exception IOException If an I/O error has occurred.
     */
    private void socketWrite(byte b[], int off, int len) throws IOException {


        if (len <= 0 || off < 0 || len > b.length - off) {
            if (len == 0) {
                return;
            }
            throw new ArrayIndexOutOfBoundsException("len == " + len
                    + " off == " + off + " buffer length == " + b.length);
        }

        FileDescriptor fd = impl.acquireFD();
        try {
            socketWrite0(fd, b, off, len);
        } catch (SocketException se) {
            if (se instanceof sun.net.ConnectionResetException) {
                impl.setConnectionResetPending();
                se = new SocketException("Connection reset");
            }
            if (impl.isClosedOrPending()) {
                throw new SocketException("Socket closed");
            } else {
                throw se;
            }
        } finally {
            impl.releaseFD();
        }
    }

    
Writes a byte to the socket.

Params:
  • b – the data to be written
Throws:
/**
     * Writes a byte to the socket.
     * @param b the data to be written
     * @exception IOException If an I/O error has occurred.
     */
    public void write(int b) throws IOException {
        temp[0] = (byte)b;
        socketWrite(temp, 0, 1);
    }

    
Writes the contents of the buffer b to the socket.

Params:
  • b – the data to be written
Throws:
/**
     * Writes the contents of the buffer <i>b</i> to the socket.
     * @param b the data to be written
     * @exception SocketException If an I/O error has occurred.
     */
    public void write(byte b[]) throws IOException {
        socketWrite(b, 0, b.length);
    }

    
Writes length bytes from buffer b starting at
offset len.

Params:
  • b – the data to be written
  • off – the start offset in the data
  • len – the number of bytes that are written
Throws:
/**
     * Writes <i>length</i> bytes from buffer <i>b</i> starting at
     * offset <i>len</i>.
     * @param b the data to be written
     * @param off the start offset in the data
     * @param len the number of bytes that are written
     * @exception SocketException If an I/O error has occurred.
     */
    public void write(byte b[], int off, int len) throws IOException {
        socketWrite(b, off, len);
    }

    
Closes the stream.

/**
     * Closes the stream.
     */
    private boolean closing = false;
    public void close() throws IOException {
        // Prevent recursion. See BugId 4484411
        if (closing)
            return;
        closing = true;
        if (socket != null) {
            if (!socket.isClosed())
                socket.close();
        } else
            impl.close();
        closing = false;
    }

    
Overrides finalize, the fd is closed by the Socket.

/**
     * Overrides finalize, the fd is closed by the Socket.
     */
    protected void finalize() {}

    
Perform class load-time initializations.

/**
     * Perform class load-time initializations.
     */
    private native static void init();

}