gcc/libjava/java/io/FileOutputStream.java

/* FileOutputStream.java -- Writes to a file on disk.
   Copyright (C) 1998, 2001, 2003 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package java.io;

import java.nio.channels.FileChannel;
import gnu.java.nio.FileChannelImpl;

/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * Status:  Complete to version 1.1.
 */

/**
 * @author Tom Tromey <tromey@cygnus.com>
 * @date September 24, 1998 
 */
public class FileOutputStream extends OutputStream
{
  // Instance variables.
  private FileDescriptor fd;
  private FileChannel ch;
  
  public FileOutputStream (String path, boolean append)
    throws SecurityException, FileNotFoundException
  {
    SecurityManager s = System.getSecurityManager();
    if (s != null)
      s.checkWrite(path);
    fd = new FileDescriptor (path, (append
				    ? FileDescriptor.APPEND
				    : FileDescriptor.WRITE));
  }

  public FileOutputStream (String path)
    throws SecurityException, FileNotFoundException
  {
    this (path, false);
  }

  public FileOutputStream (File file)
    throws SecurityException, FileNotFoundException
  {
    this (file.getPath(), false);
  }

  /**
   * This method initializes a <code>FileOutputStream</code> object to write
   * to the specified <code>File</code> object.  The file is created if it 
   * does not exist, and the bytes written are written starting at the 
   * beginning of the file if the <code>append</code> parameter is 
   * <code>false</code>.  Otherwise bytes are written at the end of the
   * file.
   * <p>
   * Before opening a file, a security check is performed by calling the
   * <code>checkWrite</code> method of the <code>SecurityManager</code> (if
   * one exists) with the name of the file to be opened.  An exception is
   * thrown if writing is not allowed. 
   *
   * @param file The <code>File</code> object this stream should write to
   * @param append <code>true</code> to append bytes to the end of the file,
   * or <code>false</code> to write bytes to the beginning
   *
   * @exception SecurityException If write access to the file is not allowed
   * @exception FileNotFoundException If a non-security error occurs
   */
  public
  FileOutputStream(File file, boolean append) throws FileNotFoundException
  {
    this(file.getPath(), append);
  }

  public FileOutputStream (FileDescriptor fdObj)
    throws SecurityException
  {
    SecurityManager s = System.getSecurityManager();
    if (s != null)
      s.checkWrite(fdObj);
    fd = fdObj;
  }

  protected void finalize () throws IOException
  {
    // We don't actually need this, but we include it because it is
    // mentioned in the JCL.
  }

  public final FileDescriptor getFD () throws IOException
  {
    if (! fd.valid())
      throw new IOException ();
    return fd;
  }

  public void write (int b) throws IOException
  {
    fd.write (b);
  }

  public void write (byte[] b) throws IOException, NullPointerException
  {
    fd.write (b, 0, b.length);
  }

  public void write (byte[] b, int off, int len)
    throws IOException, NullPointerException, IndexOutOfBoundsException
  {
    if (off < 0 || len < 0 || off + len > b.length)
      throw new ArrayIndexOutOfBoundsException ();
    fd.write (b, off, len);
  }

  public void close () throws IOException
  {
    if (fd.valid())
      fd.close();
  }

  public FileChannel getChannel ()
  {
    synchronized (this)
      {
        if (ch == null)
          ch = new FileChannelImpl (fd, true, this);

        return ch;
      }
  }

}