gcc/libjava/java/io/FileOutputStream.java

// FileOutputStream.java - Write bytes to a file.

/* Copyright (C) 1998, 1999, 2001  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.io;

import java.nio.channels.FileChannel;

/**
 * @author Tom Tromey <tromey@cygnus.com>
 * @date September 24, 1998 
 */

/* 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.
 */

public class FileOutputStream extends OutputStream
{
  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();
  }

  // Instance variables.
  private FileDescriptor fd;

  public FileChannel getChannel ()
  {
    return null;
  }
}