/*
 * Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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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 <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.
 * @param impl the socket output stream inplemented
 */
 SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException {
 super(impl.getFileDescriptor());
 this.impl = impl;
 socket = impl.getSocket();
 }

 /**
 * 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.
 * @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.
 * @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 (impl.isClosedOrPending()) {
 throw new SocketException("Socket closed");
 } else {
 throw se;
 }
 } finally {
 impl.releaseFD();
 }
 }

 /**
 * 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 <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 <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.
 */
 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.
 */
 @SuppressWarnings({"deprecation", "removal"})
 protected void finalize() {}

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

}